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消息中间件 笔记 五:RabbitMQ的使用场景(异步处理、应用解耦)

一、异步处理

场景:

用户注册,写入数据库成功以后,发送邮件和短信。

准备工作:

1)安装RabbitMQ,参考前面的文章

2)新建一个名为RabbitMQAsyncProc的maven web工程,在pom.xml文件里面引入如下依赖

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.study.demo</groupId>
  <artifactId>RabbitMQAsyncProc</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>RabbitMQAsyncProc Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>javax</groupId>
      <artifactId>javaee-web-api</artifactId>
      <version>7.0</version>
      <scope>provided</scope>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>4.3.11.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>

    <!--日志-->
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>1.7.5</version>
    </dependency>
<!--    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.16</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>jcl-over-slf4j</artifactId>
      <version>1.7.5</version>
    </dependency>-->
    <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-classic</artifactId>
      <version>1.0.13</version>
    </dependency>
    <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-core</artifactId>
      <version>1.0.13</version>
    </dependency>
    <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-access</artifactId>
      <version>1.0.13</version>
    </dependency>

    <!--JSON-->
    <dependency>
      <groupId>org.codehaus.jackson</groupId>
      <artifactId>jackson-mapper-asl</artifactId>
      <version>1.9.13</version>
    </dependency>
    <dependency>
      <groupId>org.codehaus.jackson</groupId>
      <artifactId>jackson-core-asl</artifactId>
      <version>1.9.13</version>
    </dependency>

    <!-- RabbitMQ -->
    <dependency>
      <groupId>com.rabbitmq</groupId>
      <artifactId>amqp-client</artifactId>
      <version>5.0.0</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.amqp</groupId>
      <artifactId>spring-rabbit</artifactId>
      <version>2.0.0.RELEASE</version>
    </dependency>

      <!--使用AspectJ方式注解需要相应的包-->
      <dependency>
          <groupId>org.aspectj</groupId>
          <artifactId>aspectjrt</artifactId>
          <version>1.6.12</version>
      </dependency>
      <!--使用AspectJ方式注解需要相应的包-->
      <dependency>
          <groupId>org.aspectj</groupId>
          <artifactId>aspectjweaver</artifactId>
          <version>1.6.12</version>
      </dependency>
  </dependencies>
  <build>
    <finalName>RabbitMQAsyncProc</finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.3.2</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.6</version>
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>
            </plugin>

        </plugins>
    <resources>
      <resource>
        <directory>${basedir}/src/main/java</directory>
        <includes>
          <include>**/*.xml</include>
        </includes>
      </resource>
    </resources>
  </build>
</project>

1. 新建一个用户信息实体

package com.study.demo.vo;

import java.util.UUID;

/**
 * 
 * @Description: 用户信息实体
 * @author liguangsheng
 * @date 2018年9月18日
 *
 */
public class User {

    private final String userId;
    private final String userName;
    private final String email;
    private final String phoneNumber;

    public User(String userId, String userName, String email, String phoneNumber) {
        this.userId = userId;
        this.userName = userName;
        this.email = email;
        this.phoneNumber = phoneNumber;
    }

    public String getUserId() {
        return userId;
    }

    public String getUserName() {
        return userName;
    }

    public String getEmail() {
        return email;
    }

    public String getPhoneNumber() {
        return phoneNumber;
    }

    public static User makeUser(String userName,String email,String phoneNumber){
        String userId = UUID.randomUUID().toString();
        return new User(userId,userName,email,phoneNumber);
    }

    @Override
    public String toString() {
        return "User{" +
                "userId='" + userId + '\'' +
                ", userName='" + userName + '\'' +
                ", email='" + email + '\'' +
                ", phoneNumber='" + phoneNumber + '\'' +
                '}';
    }
}

2. 新建一个用户注册接口

package com.study.demo.service;

import com.study.demo.vo.User;

/**
 * 
 * @Description: 用户注册接口
 * @author leeSmall
 * @date 2018年9月18日
 *
 */
public interface IUserReg {

    public boolean userRegister(User user);

}

3. 新建三个业务类

1)保存用户数据到数据库

package com.study.demo.service.busi;

import java.util.concurrent.ConcurrentHashMap;

import org.springframework.stereotype.Service;

import com.study.demo.vo.User;

/**
 * 
 * @Description: 保存用户数据到数据库
 * @author leeSmall
 * @date 2018年9月18日
 *
 */
@Service
public class SaveUser {

    private ConcurrentHashMap<String,User> userData =
            new ConcurrentHashMap<String, User>();

    public void saveUser(User user){
        try {
            Thread.sleep(50);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        userData.putIfAbsent(user.getUserId(),user);
    }

    public User getUser(String userId){
        return userData.get(userId);
    }


}

2)发送邮件的服务

package com.study.demo.service.busi;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;

/**
 * 
 * @Description: 发送邮件的服务
 * @author leeSmall
 * @date 2018年9月18日
 *
 */
@Service
public class SendEmail {
    private Logger logger = LoggerFactory.getLogger(SendEmail.class);

    public void sendEmail(String email){
        try {
            Thread.sleep(100);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        logger.info("-------------Already Send email to "+email);
    }

}

3)发送短信的服务

package com.study.demo.service.busi;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;

/**
 * 
 * @Description: 发送短信的服务
 * @author leeSmall
 * @date 2018年9月18日
 *
 */
@Service
public class SendSms {

    private Logger logger = LoggerFactory.getLogger(SendSms.class);

    public void sendSms(String phoneNumber){
        try {
            Thread.sleep(100);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        logger.info("-------------Already Send Sms to "+phoneNumber);
    }

}

4. 新建/RabbitMQAsyncProc/src/main/java/applicationContext.xml配置文件

<?xml version="1.0" encoding="UTF-8"?>
<!-- 查找最新的schemaLocation 访问 http://www.springframework.org/schema/ -->
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:jee="http://www.springframework.org/schema/jee"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:task="http://www.springframework.org/schema/task"
       xmlns:rabbit="http://www.springframework.org/schema/rabbit"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
    http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd
    http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
    http://www.springframework.org/schema/tx  http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
    http://www.springframework.org/schema/aop  http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
    http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.0.xsd
    http://www.springframework.org/schema/rabbit
    http://www.springframework.org/schema/rabbit/spring-rabbit-2.0.xsd">

    <aop:aspectj-autoproxy />

     <!-- 配置扫描路径 -->
     <context:component-scan base-package="com.study.demo">
         <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
     </context:component-scan>

    <!-- rabbitMQ配置 -->
    <bean id="rabbitConnectionFactory"
          class="org.springframework.amqp.rabbit.connection.CachingConnectionFactory">
        <constructor-arg value="127.0.0.1"/>
        <property name="username" value="guest"/>
        <property name="password" value="guest"/>
        <property name="channelCacheSize" value="8"/>
        <property name="port" value="5672"></property>
    </bean>
    <rabbit:admin connection-factory="rabbitConnectionFactory"/>

    <!--邮件相关队列-->
    <rabbit:queue name="email_queue" durable="false"/>
    <!--短信相关队列-->
    <rabbit:queue name="sms_queue" durable="false"/>

    <!--将队列和交换器通过路由键绑定-->
    <rabbit:direct-exchange name="user-reg-exchange"
                            xmlns="http://www.springframework.org/schema/rabbit"
                            durable="true">
        <rabbit:bindings>
            <rabbit:binding queue="email_queue" key="email" ></rabbit:binding>
            <rabbit:binding queue="sms_queue" key="sms" ></rabbit:binding>
        </rabbit:bindings>
    </rabbit:direct-exchange>

    <!-- 创建rabbitTemplate 消息模板类 -->
    <bean id="rabbitTemplate" class="org.springframework.amqp.rabbit.core.RabbitTemplate">
        <constructor-arg ref="rabbitConnectionFactory"></constructor-arg>
    </bean>


</beans>  

5. 新建一个串行的用户注册实现类

package com.study.demo.service.impl;

import com.study.demo.service.IUserReg;
import com.study.demo.service.busi.SaveUser;
import com.study.demo.service.busi.SendEmail;
import com.study.demo.service.busi.SendSms;
import com.study.demo.vo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;

/**
 * 
 * @Description: 串行的用户注册
 * @author leeSmall
 * @date 2018年9月18日
 *
 */
@Service
@Qualifier("serial")
public class SerialProcess implements IUserReg {

    @Autowired
    private SaveUser saveUser;
    @Autowired
    private SendEmail sendEmail;
    @Autowired
    private SendSms sendSms;

    public boolean userRegister(User user) {
        try {
            saveUser.saveUser(user);
            sendEmail.sendEmail(user.getEmail());
            sendSms.sendSms(user.getPhoneNumber());
            return true;
        } catch (Exception e) {
            return false;
        }
    }
}

6. 新建一个并行的用户注册实现类

package com.study.demo.service.impl;

import java.util.concurrent.Callable;
import java.util.concurrent.FutureTask;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;

import com.study.demo.service.IUserReg;
import com.study.demo.service.busi.SaveUser;
import com.study.demo.service.busi.SendEmail;
import com.study.demo.service.busi.SendSms;
import com.study.demo.vo.User;

/**
 * 
 * @Description: 并行的用户注册
 * @author leeSmall
 * @date 2018年9月18日
 *
 */
@Service
@Qualifier("para")
public class ParalllerProcess implements IUserReg {

    private static Logger logger = LoggerFactory.getLogger(ParalllerProcess.class);

    @Autowired
    private SaveUser saveUser;
    @Autowired
    private SendEmail sendEmail;
    @Autowired
    private SendSms sendSms;

    //发送邮件的线程
    private static class SendEmailThread implements Callable<Boolean>{

        private SendEmail sendEmail;
        private String email;

        public SendEmailThread(SendEmail sendEmail, String email) {
            this.sendEmail = sendEmail;
            this.email = email;
        }

        public Boolean call() throws Exception {
            sendEmail.sendEmail(email);
            logger.info("SendEmailThread send mail to"+email);
            return true;
        }
    }

    //发送短信的线程
    private static class SendSmsThread implements Callable<Boolean>{

        private SendSms sendSms;
        private String phoneNumber;

        public SendSmsThread(SendSms sendSms, String phoneNumber) {
            this.sendSms = sendSms;
            this.phoneNumber = phoneNumber;
        }

        public Boolean call() throws Exception {
            sendSms.sendSms(phoneNumber);
            logger.info("SendSmsThread send mail to"+phoneNumber);
            return true;
        }
    }

    public boolean userRegister(User user) {
        FutureTask<Boolean> sendEmailFuture =
                new FutureTask<Boolean>(new SendEmailThread(sendEmail,user.getEmail()));
        FutureTask<Boolean> sendSmsFuture =
                new FutureTask<Boolean>(new SendSmsThread(sendSms,user.getPhoneNumber()));
        try {
            saveUser.saveUser(user);
            new Thread(sendEmailFuture).start();
            new Thread(sendSmsFuture).start();
            sendEmailFuture.get();//获取邮件发送的结果
            sendSmsFuture.get();//获取短信发送的结果
            return true;
        } catch (Exception e) {
            logger.error(e.toString());
            return  false;
        }

    }
}

7. 新建一个RabbitMQ实现的异步用户注册

package com.study.demo.service.impl;

import com.study.demo.service.IUserReg;
import com.study.demo.service.busi.SaveUser;
import com.study.demo.vo.User;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.AmqpException;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessageProperties;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;


/**
 * 
 * @Description: RabbitMQ实现的异步用户注册
 * @author leeSmall
 * @date 2018年9月18日
 *
 */
@Service
@Qualifier("async")
public class AsyncProcess implements IUserReg{

    private Logger logger = LoggerFactory.getLogger(AsyncProcess.class);

    @Autowired
    private RabbitTemplate rabbitTemplate;
    @Autowired
    private SaveUser saveUser;


    public boolean userRegister(User user) {
        try {
            saveUser.saveUser(user);
            rabbitTemplate.send("user-reg-exchange","email",
                    new Message(user.getEmail().getBytes(),new MessageProperties()));
            rabbitTemplate.send("user-reg-exchange","sms",
                    new Message(user.getEmail().getBytes(),new MessageProperties()));
        } catch (AmqpException e) {
            logger.error(e.toString());
            return  false;
        }

        return true;
    }
}

8.新建一个RabbitMQ消息消费端监听邮件消息类

package com.study.demo.service.mq;

import com.study.demo.service.busi.SendEmail;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessageListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

/**
 * 
 * @Description: RabbitMQ消息消费端监听邮件消息类
 * @author leeSmall
 * @date 2018年9月18日
 *
 */
@Component
public class ProcessUserEmail implements MessageListener {

    private Logger logger = LoggerFactory.getLogger(ProcessUserEmail.class);

    @Autowired
    private SendEmail sendEmail;

    public void onMessage(Message message) {
        logger.info("accept message,ready process......");
        sendEmail.sendEmail(new String(message.getBody()));

    }
}

在/RabbitMQAsyncProc/src/main/java/applicationContext.xml添加邮件消息监听类配置:

    <rabbit:listener-container connection-factory="rabbitConnectionFactory">
        <rabbit:listener queues="email_queue" ref="processUserEmail"
                         method="onMessage"/>
    </rabbit:listener-container>

9. 新建一个RabbitMQ消息消费端监听sms消息类

package com.study.demo.service.mq;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessageListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import com.study.demo.service.busi.SendSms;

/**
 * 
 * @Description: RabbitMQ消息消费端监听sms消息类
 * @author leeSmall
 * @date 2018年9月18日
 *
 */
@Component
public class ProcessUserSms implements MessageListener {

    private Logger logger = LoggerFactory.getLogger(ProcessUserSms.class);

    @Autowired
    private SendSms sendSms;

    public void onMessage(Message message) {
        logger.info("accept message,ready process......");
        sendSms.sendSms(new String(message.getBody()));

    }
}

在/RabbitMQAsyncProc/src/main/java/applicationContext.xml添加短信消息监听类配置:

    <rabbit:listener-container connection-factory="rabbitConnectionFactory">
        <rabbit:listener queues="email_queue" ref="processUserEmail"
                         method="onMessage"/>
        <rabbit:listener queues="sms_queue" ref="processUserSms"
                         method="onMessage"/>
    </rabbit:listener-container>

10. 新建一个统计花费时间工具类

package com.study.demo.tools;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;

import com.study.demo.vo.User;

/**
 * 
 * @Description: 统计花费时间工具类
 * @author leeSmall
 * @date 2018年9月18日
 *
 */
@Aspect
@Service
public class StatTime {

    private Logger logger = LoggerFactory.getLogger(StatTime.class);
    private User user;

    public StatTime() {
        logger.info("************Aop开启");
    }

    @Pointcut("execution(* com.study.demo.service.impl.*.*Register(..))")
    public void stat(){}

    @Around("stat()&&args(user)")
    public Object statTime(ProceedingJoinPoint proceedingJoinPoint,User user){
        this.user = user;
        long start = System.currentTimeMillis();
        Object result = null;
        try {
            result = proceedingJoinPoint.proceed(new Object[]{this.user});
        } catch (Throwable throwable) {
            throwable.printStackTrace();
        }
        logger.info("************spend time : "+(System.currentTimeMillis()-start)+"ms");
        return result;

    }

}

11. 新建一个用户注册控制器

package com.study.demo.controller;

import com.study.demo.service.IUserReg;
import com.study.demo.vo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

/**
 * 
 * @Description: 用户注册控制器
 * @author leeSmall
 * @date 2018年9月18日
 *
 */
@Controller
public class UserRegController {

    private static final String SUCCESS = "suc";
    private static final String FAILUER = "failure";

    @Autowired
    @Qualifier("serial")
    private  IUserReg userReg;

    @RequestMapping("/userReg")
    public String userReg(){
        return "index";
    }

    @RequestMapping("/saveUser")
    @ResponseBody
    public String saveUser(@RequestParam("userName")String userName,
                           @RequestParam("email")String email,
                           @RequestParam("phoneNumber")String phoneNumber){
        try {
            if (userReg.userRegister(User.makeUser(userName,email,phoneNumber)))
                return SUCCESS;
            else
                return FAILUER;
        } catch (Exception e) {
            return FAILUER;
        }
    }


}

12. 新建/RabbitMQAsyncProc/src/main/java/spring-mvc.xml配置文件

<?xml version="1.0" encoding="UTF-8"?>  
<!-- 查找最新的schemaLocation 访问 http://www.springframework.org/schema/ -->
<beans xmlns="http://www.springframework.org/schema/beans"   
       xmlns:aop="http://www.springframework.org/schema/aop"   
       xmlns:context="http://www.springframework.org/schema/context"  
       xmlns:mvc="http://www.springframework.org/schema/mvc"   
       xmlns:tx="http://www.springframework.org/schema/tx"   
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
       xsi:schemaLocation="http://www.springframework.org/schema/aop   
        http://www.springframework.org/schema/aop/spring-aop-4.0.xsd   
        http://www.springframework.org/schema/beans   
        http://www.springframework.org/schema/beans/spring-beans-4.0.xsd   
        http://www.springframework.org/schema/context   
        http://www.springframework.org/schema/context/spring-context-4.0.xsd   
        http://www.springframework.org/schema/mvc   
        http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd   
        http://www.springframework.org/schema/tx   
        http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">

<!--    <mvc:default-servlet-handler />-->
    <mvc:resources mapping="/js/**" location="/js/"/>
    <mvc:annotation-driven
            content-negotiation-manager="contentNegotiationManager" />

    <context:component-scan base-package="com.study.demo.controller">
<!--        <context:include-filter type="annotation"
                                expression="org.springframework.stereotype.Controller" />-->
    </context:component-scan>


    <bean id="stringHttpMessageConverter"
          class="org.springframework.http.converter.StringHttpMessageConverter">
        <property name="supportedMediaTypes">
            <list>
                <bean class="org.springframework.http.MediaType">
                    <constructor-arg index="0" value="text" />
                    <constructor-arg index="1" value="plain" />
                    <constructor-arg index="2" value="UTF-8" />
                </bean>
            </list>
        </property>
    </bean>
    <bean id="mappingJacksonHttpMessageConverter"
          class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter" />

    <bean
            class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="messageConverters">
            <list>
                <ref bean="stringHttpMessageConverter" />
                <ref bean="mappingJacksonHttpMessageConverter" />
            </list>
        </property>
    </bean>

    <bean id="contentNegotiationManager"
          class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
        <property name="mediaTypes">
            <map>
                <entry key="html" value="text/html" />
                <entry key="pdf" value="application/pdf" />
                <entry key="xsl" value="application/vnd.ms-excel" />
                <entry key="xml" value="application/xml" />
                <entry key="json" value="application/json" />
            </map>
        </property>
        <property name="defaultContentType" value="text/html" />
    </bean>

    <bean id="viewResolver"
          class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
        <property name="order" value="0" />
        <property name="contentNegotiationManager" ref="contentNegotiationManager" />

        <property name="viewResolvers">
            <list>
                <bean class="org.springframework.web.servlet.view.BeanNameViewResolver" />
                <bean
                        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
                    <property name="viewClass"
                              value="org.springframework.web.servlet.view.JstlView" />
                    <property name="prefix" value="/WEB-INF/views/" />
                    <property name="suffix" value=".jsp"></property>
                </bean>
            </list>
        </property>

        <property name="defaultViews">
            <list>
                <bean
                        class="org.springframework.web.servlet.view.json.MappingJackson2JsonView">
                    <property name="extractValueFromSingleKeyModel" value="true" />
                </bean>
            </list>
        </property>
    </bean>

</beans>  

13. 新建一个/RabbitMQAsyncProc/src/main/webapp/WEB-INF/views/index.jsp页面

<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
    String path = request.getContextPath();
    System.out.println(path);
    String basePath = request.getScheme() + "://"
            + request.getServerName() + ":" + request.getServerPort()
            + path + "/";
    System.out.println(basePath);
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <base href="<%=basePath%>">

    <title>用户注册-异步模式</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <script type="text/javascript" src="<%--<%=basePath%>--%>resources/js/jquery-1.11.0.min.js"></script>
    <style type="text/css">
        .h1 {
            margin: 0 auto;
        }

        #producer{
            width: 48%;
            border: 1px solid blue;
            height: 80%;
            align:center;
            margin:0 auto;
        }

        body{
            text-align :center;
        }
        div {
            text-align :center;
        }
        textarea{
            width:80%;
            height:100px;
            border:1px solid gray;
        }
        button{
            background-color: rgb(62, 156, 66);
            border: none;
            font-weight: bold;
            color: white;
            height:30px;
        }
    </style>
    <script type="text/javascript">

        function send(){
            $.ajax({
                type: 'get',
                url:'<%=basePath%>saveUser?userName='+$("#userName").val()
                  +'&email='+$("#userEmail").val()+'&phoneNumber='+$("#userNumber").val(),
                dataType:'text',
                success:function(data){
                    if(data=="suc"){
                        alert("注册成功!");
                    }else{
                        alert("注册失败!");
                    }
                },
                error:function(data){
                    alert("注册错误!");
                }

            });
        }
    </script>
</head>

<body>
<h1>用户注册-异步模式</h1>
<div id="producer">
    用户姓名:<input type="text" id="userName"/>
    <br>
    用户邮件:<input type="text" id="userEmail"/>
    <br>
    用户手机:<input type="text" id="userNumber"/>
    <br>
    <button onclick="send()">注 册</button>
    <br>
</div>
</body>
</html>

14. 新建/RabbitMQAsyncProc/src/main/webapp/WEB-INF/web.xml配置文件

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         version="3.0">
  <display-name>RabbitMqSpringProducerDemo</display-name>

  <servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>*.js</url-pattern>
  </servlet-mapping>

  <!-- Spring 编码过滤器 start -->
  <filter>
    <filter-name>characterEncoding</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
    <init-param>
      <param-name>forceEncoding</param-name>
      <param-value>true</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>characterEncoding</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  <!-- Spring 编码过滤器 End -->

  <!-- Spring Application Context Listener Start -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
  </context-param>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <!-- Spring Application Context Listener End -->


  <!-- Spring MVC Config Start -->
  <servlet>
    <servlet-name>SpringMVC</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:spring-mvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>SpringMVC</servlet-name>
    <!-- Filter all resources -->
    <url-pattern>/</url-pattern>
  </servlet-mapping>
  <!-- Spring MVC Config End -->

</web-app>

到此代码别写完成!

15. 在Tomcat v8.5 8080里面启动RabbitMQAsyncProc

首次启动时用户注册接口时串行的

    @Autowired
    @Qualifier("serial")
    private  IUserReg userReg;

在浏览器输入地址http://localhost:8080/RabbitMQAsyncProc/userReg访问进行用户注册

98_1.png

查看控制台状态:

98_2.png

修改用户注册接口为并行的:

    @Autowired
    @Qualifier("para")
    private  IUserReg userReg;

在用户界面注册 查看控制台状态:

98_3.png

98_4.png

修改用户注册接口为RabbitMQ异步实现的的:

    @Autowired
    @Qualifier("async")
    private  IUserReg userReg;

在用户界面注册 查看控制台状态:

98_5.png

98_6.png

总结:

串行模式 ************spend time : 251ms

并行模式 ************spend time : 153ms

消息队列模式:************spend time : 59ms

所以RabbitMQ异步处理的性能最快

二、应用解耦

场景:

用户下订单买商品,订单成功了,去扣减库存,库存必须扣减完成,没有库存,库存低于某个阈值,可以扣减成功,要通知其他系统(如采购系统尽快采购,用户订单系统我们尽快调货)

RPC实现。库存系统失败,订单系统也无法成功,订单系统和库存系统耦合了。所以要缓存消息中间件来解耦。发送一个扣减库存的消息,保证消息必须被库存系统处理。

三个问题要解决:

1)订单系统发给MQ服务器的消息,必须被MO服务器接收到(事物、发送者确认)

2)MQ服务器拿到消息以后,消息被正常处理以前必须保存住(持久化)

3)某个库存服务出现了异常,消息要能够被其他库存系统处理(消费者确认,消息监听类要实现ChannelAwareMessageListener)

订单系统一定要知道库存系统是否处理成功怎么办?

库存系统和订单系统之间建立一个消息通道,库存系统去通知订单系统

准备工作:

1)安装RabbitMQ,参考前面的文章

2)分别新建名为RabbitMQOrder和RabbitMQDepot的两个maven web工程,在pom,xml文件里面引入一些依赖

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.study.demo</groupId>
    <artifactId>RabbitMQOrder</artifactId>
    <packaging>war</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>RabbitMQOrder Maven Webapp</name>
    <url>http://maven.apache.org</url>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-web-api</artifactId>
            <version>7.0</version>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.3.11.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

        <!--日志 -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.5</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.16</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>jcl-over-slf4j</artifactId>
            <version>1.7.5</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>1.0.13</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-core</artifactId>
            <version>1.0.13</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-access</artifactId>
            <version>1.0.13</version>
        </dependency>

        <!--JSON -->
        <dependency>
            <groupId>org.codehaus.jackson</groupId>
            <artifactId>jackson-mapper-asl</artifactId>
            <version>1.9.13</version>
        </dependency>
        <dependency>
            <groupId>org.codehaus.jackson</groupId>
            <artifactId>jackson-core-asl</artifactId>
            <version>1.9.13</version>
        </dependency>

        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.8.2</version>
        </dependency>

        <!-- RabbitMQ -->
        <dependency>
            <groupId>com.rabbitmq</groupId>
            <artifactId>amqp-client</artifactId>
            <version>5.0.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.amqp</groupId>
            <artifactId>spring-rabbit</artifactId>
            <version>2.0.0.RELEASE</version>
        </dependency>

        <!--使用AspectJ方式注解需要相应的包 -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
            <version>1.6.12</version>
        </dependency>
        <!--使用AspectJ方式注解需要相应的包 -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.6.12</version>
        </dependency>
    </dependencies>
    <build>
        <finalName>RabbitMQOrder</finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.3.2</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.6</version>
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>
            </plugin>

        </plugins>
        <resources>
            <resource>
                <directory>${basedir}/src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
            </resource>
        </resources>
    </build>
</project>

编写订单系统RabbitMQOrder代码:

1. 在工程RabbitMQOrder新建一个商品实体

package com.study.demo.vo;

import java.io.Serializable;

/**
 * 
 * @Description: 商品实体
 * @author leeSmall
 * @date 2018年9月19日
 *
 */
public class GoodTransferVo  implements Serializable {


    private static final long serialVersionUID = 7702481109435751937L;

    /**
     * 商品id
     */
    private String goodsId;

    /**
     * 改变的库存量
     */
    private int changeAmount;

    /**
     * 入库或者出库
     */
    private boolean inOrOut;

    public String getGoodsId() {
        return goodsId;
    }

    public void setGoodsId(String goodsId) {
        this.goodsId = goodsId;
    }

    public int getChangeAmount() {
        return changeAmount;
    }

    public void setChangeAmount(int changeAmount) {
        this.changeAmount = changeAmount;
    }

    public boolean isInOrOut() {
        return inOrOut;
    }

    public void setInOrOut(boolean inOrOut) {
        this.inOrOut = inOrOut;
    }
}

2. 在工程RabbitMQOrder新建一个处理库存接口

package com.study.demo.service;

/**
 * 
 * @Description: 处理库存接口
 * @author leeSmall
 * @date 2018年9月19日
 *
 */
public interface IProDepot {

    public void processDepot(String goodsId,int amount);

}

3. 在工程RabbitMQOrder新建一个/RabbitMQOrder/src/main/java/applicationContext.xml配置文件,配置RabbitMQ

<?xml version="1.0" encoding="UTF-8"?>
<!-- 查找最新的schemaLocation 访问 http://www.springframework.org/schema/ -->
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:jee="http://www.springframework.org/schema/jee"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:task="http://www.springframework.org/schema/task"
       xmlns:rabbit="http://www.springframework.org/schema/rabbit"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
    http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd
    http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
    http://www.springframework.org/schema/tx  http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
    http://www.springframework.org/schema/aop  http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
    http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.0.xsd
    http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit-2.0.xsd">

     <!-- 配置扫描路径 -->
     <context:component-scan base-package="com.study.demo">
         <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
     </context:component-scan>

    <!-- rabbitMQ配置 -->
    <bean id="rabbitConnectionFactory"
          class="org.springframework.amqp.rabbit.connection.CachingConnectionFactory">
        <constructor-arg value="127.0.0.1"/>
        <property name="username" value="guest"/>
        <property name="password" value="guest"/>
        <property name="channelCacheSize" value="8"/>
        <property name="port" value="5672"></property>
    </bean>
    <rabbit:admin connection-factory="rabbitConnectionFactory"/>

    <rabbit:queue name="depot_queue" durable="true"/>

    <!--队列通过路由键和交换器绑定  -->
    <rabbit:direct-exchange name="depot-amount-exchange"
          xmlns="http://www.springframework.org/schema/rabbit" durable="true">
        <rabbit:bindings>
            <rabbit:binding queue="depot_queue" key="amount.depot" ></rabbit:binding>
        </rabbit:bindings>
    </rabbit:direct-exchange>

    <!-- 创建rabbitTemplate 消息模板类 -->
    <bean id="rabbitTemplate" class="org.springframework.amqp.rabbit.core.RabbitTemplate">
        <constructor-arg ref="rabbitConnectionFactory"></constructor-arg>
    </bean>


</beans>

4. 在工程RabbitMQOrder新建一个RabbitMQ处理库存接口的实现类

package com.study.demo.service;

import com.study.demo.vo.GoodTransferVo;
import com.google.gson.Gson;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessageDeliveryMode;
import org.springframework.amqp.core.MessageProperties;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;

/**
 * 
 * @Description: RabbitMQ处理库存接口的实现类
 * @author leeSmall
 * @date 2018年9月19日
 *
 */
@Service
@Qualifier("mq")
public class MqMode  implements IProDepot {

    private final static String DEPOT_RK = "amount.depot";
    private final static String DEPOT_EXCHANGE = "depot-amount-exchange";

    @Autowired
    RabbitTemplate rabbitTemplate;

    private static Gson gson = new Gson();

    public void processDepot(String goodsId, int amount) {
        GoodTransferVo goodTransferVo = new GoodTransferVo();
        goodTransferVo.setGoodsId(goodsId);
        goodTransferVo.setChangeAmount(amount);
        goodTransferVo.setInOrOut(false);
        String goods = gson.toJson(goodTransferVo);
        MessageProperties messageProperties = new MessageProperties();
        messageProperties.setDeliveryMode(MessageDeliveryMode.PERSISTENT);
        rabbitTemplate.send(DEPOT_EXCHANGE, DEPOT_RK,
                new Message(goods.getBytes(), messageProperties));
    }
}

5. 在工程RabbitMQOrder新建一个处理订单业务类

package com.study.demo.service;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;

/**
 * 
 * @Description: 处理订单业务类
 * @author leeSmall
 * @date 2018年9月19日
 *
 */
@Service
public class ProcessOrder {
    private Logger logger = LoggerFactory.getLogger(ProcessOrder.class);

    @Autowired
    @Qualifier("mq")
    private IProDepot proDepot;

    public void processOrder(String goodsId,int amount){
        try {
            Thread.sleep(80);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        logger.info("--------------------["+goodsId+"]订单入库完成,准备变动库存!");
        proDepot.processDepot(goodsId,amount);

    }

}

6. 在工程RabbitMQOrder新建一个RabbitMQ发送者确认

package com.study.demo.service.callback;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.amqp.rabbit.support.CorrelationData;
import org.springframework.stereotype.Service;

/**
 * 
 * @Description: RabbitMQ发送者确认
 * @author leeSmall
 * @date 2018年9月19日
 *
 */
@Service
public class ConfirmCallback implements RabbitTemplate.ConfirmCallback {
    private Logger logger = LoggerFactory.getLogger(ConfirmCallback.class);

    public void confirm(CorrelationData correlationData, boolean ack, String cause) {
        if (ack) {
            logger.info("消息确认发送给mq成功");
        } else {
            //处理失败的消息
            logger.info("消息发送给mq失败,考虑重发:"+cause);
        }
    }
}

7. 在工程RabbitMQOrder新建一个RabbitMQ返回确认

package com.study.demo.service.callback;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.stereotype.Service;

/**
 * 
 * @Description: RabbitMQ返回确认-RabbitMQ服务内部出错时回调
 * @author leeSmall
 * @date 2018年9月19日
 *
 */
@Service
public class SendReturnCallback implements RabbitTemplate.ReturnCallback {

    private Logger logger = LoggerFactory.getLogger(SendReturnCallback.class);

    public void returnedMessage(Message message, int replyCode,
                                String replyText, String exchange,
                                String routingKey) {
        logger.info("Returned replyText:"+replyText);
        logger.info("Returned exchange:"+exchange);
        logger.info("Returned routingKey:"+routingKey);
        String msgJson  = new String(message.getBody());
        logger.info("Returned Message:"+msgJson);
    }
}

8. 在/RabbitMQOrder/src/main/java/applicationContext.xml配置文件新增RabbitMQ发送者确认和RabbitMQ返回确认配置

<?xml version="1.0" encoding="UTF-8"?>
<!-- 查找最新的schemaLocation 访问 http://www.springframework.org/schema/ -->
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:jee="http://www.springframework.org/schema/jee"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:task="http://www.springframework.org/schema/task"
       xmlns:rabbit="http://www.springframework.org/schema/rabbit"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
    http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd
    http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
    http://www.springframework.org/schema/tx  http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
    http://www.springframework.org/schema/aop  http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
    http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.0.xsd
    http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit-2.0.xsd">

     <!-- 配置扫描路径 -->
     <context:component-scan base-package="com.study.demo">
         <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
     </context:component-scan>

    <!-- rabbitMQ配置 -->
    <bean id="rabbitConnectionFactory"
          class="org.springframework.amqp.rabbit.connection.CachingConnectionFactory">
        <constructor-arg value="127.0.0.1"/>
        <property name="username" value="guest"/>
        <property name="password" value="guest"/>
        <property name="channelCacheSize" value="8"/>
        <property name="port" value="5672"></property>
        <!-- 发布确认必须配置在CachingConnectionFactory上 -->
        <property name="publisherConfirms" value="true"/>
    </bean>
    <rabbit:admin connection-factory="rabbitConnectionFactory"/>

    <rabbit:queue name="depot_queue" durable="true"/>

    <!--队列通过路由键和交换器绑定  -->
    <rabbit:direct-exchange name="depot-amount-exchange"
          xmlns="http://www.springframework.org/schema/rabbit" durable="true">
        <rabbit:bindings>
            <rabbit:binding queue="depot_queue" key="amount.depot" ></rabbit:binding>
        </rabbit:bindings>
    </rabbit:direct-exchange>

    <!-- 创建rabbitTemplate 消息模板类 -->
    <bean id="rabbitTemplate" class="org.springframework.amqp.rabbit.core.RabbitTemplate">
        <constructor-arg ref="rabbitConnectionFactory"></constructor-arg>
        <!--消息确认回调 -->
        <property name="confirmCallback" ref="confirmCallback"/>
        <property name="returnCallback" ref="sendReturnCallback"/>
    </bean>


</beans>

9. 在工程RabbitMQOrder新建一个订单业务控制器

package com.study.demo.controller;

import com.study.demo.service.ProcessOrder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

/**
 * 
 * @Description: 订单业务控制器
 * @author leeSmall
 * @date 2018年9月19日
 *
 */
@Controller
public class OrderController {

    private Logger logger = LoggerFactory.getLogger(OrderController.class);
    private static final String SUCCESS = "suc";
    private static final String FAILUER = "failure";

    @Autowired
    private ProcessOrder processOrder;

    @RequestMapping("/order")
    public String order(){
        return "index";
    }

    @RequestMapping("/confirmOrder")
    @ResponseBody
    public String confirmOrder(@RequestParam("goodsId")String goodsId,
                           @RequestParam("amount")int amount){
        try {
            processOrder.processOrder(goodsId,amount);
            return SUCCESS;
        } catch (Exception e) {
            logger.error("订单确认异常!",e);
            return FAILUER;
        }
    }


}

10. 新增/RabbitMQOrder/src/main/java/spring-mvc.xml配置文件

<?xml version="1.0" encoding="UTF-8"?>  
<!-- 查找最新的schemaLocation 访问 http://www.springframework.org/schema/ -->
<beans xmlns="http://www.springframework.org/schema/beans"   
       xmlns:aop="http://www.springframework.org/schema/aop"   
       xmlns:context="http://www.springframework.org/schema/context"  
       xmlns:mvc="http://www.springframework.org/schema/mvc"   
       xmlns:tx="http://www.springframework.org/schema/tx"   
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
       xsi:schemaLocation="http://www.springframework.org/schema/aop   
        http://www.springframework.org/schema/aop/spring-aop-4.0.xsd   
        http://www.springframework.org/schema/beans   
        http://www.springframework.org/schema/beans/spring-beans-4.0.xsd   
        http://www.springframework.org/schema/context   
        http://www.springframework.org/schema/context/spring-context-4.0.xsd   
        http://www.springframework.org/schema/mvc   
        http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd   
        http://www.springframework.org/schema/tx   
        http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">

<!--    <mvc:default-servlet-handler />-->
    <mvc:resources mapping="/js/**" location="/js/"/>
    <mvc:annotation-driven
            content-negotiation-manager="contentNegotiationManager" />

    <context:component-scan base-package="com.study.demo.controller">
<!--        <context:include-filter type="annotation"
                                expression="org.springframework.stereotype.Controller" />-->
    </context:component-scan>


    <bean id="stringHttpMessageConverter"
          class="org.springframework.http.converter.StringHttpMessageConverter">
        <property name="supportedMediaTypes">
            <list>
                <bean class="org.springframework.http.MediaType">
                    <constructor-arg index="0" value="text" />
                    <constructor-arg index="1" value="plain" />
                    <constructor-arg index="2" value="UTF-8" />
                </bean>
            </list>
        </property>
    </bean>
    <bean id="mappingJacksonHttpMessageConverter"
          class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter" />

    <bean
            class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="messageConverters">
            <list>
                <ref bean="stringHttpMessageConverter" />
                <ref bean="mappingJacksonHttpMessageConverter" />
            </list>
        </property>
    </bean>

    <bean id="contentNegotiationManager"
          class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
        <property name="mediaTypes">
            <map>
                <entry key="html" value="text/html" />
                <entry key="pdf" value="application/pdf" />
                <entry key="xsl" value="application/vnd.ms-excel" />
                <entry key="xml" value="application/xml" />
                <entry key="json" value="application/json" />
            </map>
        </property>
        <property name="defaultContentType" value="text/html" />
    </bean>

    <bean id="viewResolver"
          class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
        <property name="order" value="0" />
        <property name="contentNegotiationManager" ref="contentNegotiationManager" />

        <property name="viewResolvers">
            <list>
                <bean class="org.springframework.web.servlet.view.BeanNameViewResolver" />
                <bean
                        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
                    <property name="viewClass"
                              value="org.springframework.web.servlet.view.JstlView" />
                    <property name="prefix" value="/WEB-INF/views/" />
                    <property name="suffix" value=".jsp"></property>
                </bean>
            </list>
        </property>

        <property name="defaultViews">
            <list>
                <bean
                        class="org.springframework.web.servlet.view.json.MappingJackson2JsonView">
                    <property name="extractValueFromSingleKeyModel" value="true" />
                </bean>
            </list>
        </property>
    </bean>

</beans>  

11. 新增/RabbitMQOrder/src/main/webapp/WEB-INF/views/index.jsp页面模拟下订单

<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
    String path = request.getContextPath();
    System.out.println(path);
    String basePath = request.getScheme() + "://"
            + request.getServerName() + ":" + request.getServerPort()
            + path + "/";
    System.out.println(basePath);
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <base href="<%=basePath%>">

    <title>订单提交</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <script type="text/javascript" src="<%--<%=basePath%>--%>resources/js/jquery-1.11.0.min.js"></script>
    <style type="text/css">
        .h1 {
            margin: 0 auto;
        }

        #producer{
            width: 48%;
            border: 1px solid blue;
            height: 80%;
            align:center;
            margin:0 auto;
        }

        body{
            text-align :center;
        }
        div {
            text-align :center;
        }
        textarea{
            width:80%;
            height:100px;
            border:1px solid gray;
        }
        button{
            background-color: rgb(62, 156, 66);
            border: none;
            font-weight: bold;
            color: white;
            height:30px;
        }
    </style>
    <script type="text/javascript">

        function send(){
            $.ajax({
                type: 'get',
                url:'<%=basePath%>confirmOrder?goodsId='+$("#goods").val()
                  +'&amount='+$("#amount").val(),
                dataType:'text',
                success:function(data){
                    if(data=="suc"){
                        alert("提交成功!");
                    }else{
                        alert("提交失败!");
                    }
                },
                error:function(data){
                    alert("提交错误!");
                }

            });
        }
    </script>
</head>

<body>
<h1>确认提交订单</h1>
<div id="producer">
    商品编号:<input type="text" id="goods"/>
    <br>
    订单数量:<input type="text" id="amount"/>
    <br>
    <button onclick="send()">确 认</button>
    <br>
</div>
</body>
</html>

12.新增 /RabbitMQOrder/src/main/webapp/WEB-INF/web.xml配置文件

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         version="3.0">
  <display-name>RabbitMQOrder</display-name>

  <servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>*.js</url-pattern>
  </servlet-mapping>

  <!-- Spring 编码过滤器 start -->
  <filter>
    <filter-name>characterEncoding</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
    <init-param>
      <param-name>forceEncoding</param-name>
      <param-value>true</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>characterEncoding</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  <!-- Spring 编码过滤器 End -->

  <!-- Spring Application Context Listener Start -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
  </context-param>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <!-- Spring Application Context Listener End -->


  <!-- Spring MVC Config Start -->
  <servlet>
    <servlet-name>SpringMVC</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:spring-mvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>SpringMVC</servlet-name>
    <!-- Filter all resources -->
    <url-pattern>/</url-pattern>
  </servlet-mapping>
  <!-- Spring MVC Config End -->

</web-app>

到此订单系统代码编写完成!

13. 在Tomcat v8.5 8080里面启动RabbitMQOrder,输入地址http://localhost:8080/RabbitMQOrder/order访问

98_7.png

编写库存系统RabbitMQDepot代码:

1. 在工程RabbitMQDepot 新建一个商品实体

package com.study.demo.vo;

import java.io.Serializable;

/**
 * 
 * @Description: 商品实体
 * @author leeSmall
 * @date 2018年9月19日
 *
 */
public class GoodTransferVo  implements Serializable {


    private static final long serialVersionUID = 7702481109435751937L;

    /**
     * 商品id
     */
    private String goodsId;

    /**
     * 改变的库存量
     */
    private int changeAmount;

    /**
     * 入库或者出库
     */
    private boolean inOrOut;

    public String getGoodsId() {
        return goodsId;
    }

    public void setGoodsId(String goodsId) {
        this.goodsId = goodsId;
    }

    public int getChangeAmount() {
        return changeAmount;
    }

    public void setChangeAmount(int changeAmount) {
        this.changeAmount = changeAmount;
    }

    public boolean isInOrOut() {
        return inOrOut;
    }

    public void setInOrOut(boolean inOrOut) {
        this.inOrOut = inOrOut;
    }
}

2. 在工程RabbitMQDepot 新建一个库存数据服务

package com.study.demo.service;

import java.util.concurrent.ConcurrentHashMap;
import java.util.function.BiFunction;

import javax.annotation.PostConstruct;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;

/**
 * 
 * @Description: 库存数据服务
 * @author leeSmall
 * @date 2018年9月19日
 *
 */
@Service
public class Depot {

    private static Logger logger = LoggerFactory.getLogger(Depot.class);

    private ConcurrentHashMap<String,Integer> goodsData =
            new ConcurrentHashMap<String, Integer>();

    @PostConstruct
    public void initDepot(){
        goodsData.put("001",1000);
        goodsData.put("002",500);
        goodsData.put("003",600);
        goodsData.put("004",700);
    }


    //增加库存
    public void inDepot(String goodsId,int addAmout){
        logger.info("+++++++++++++++++增加商品:"+goodsId+"库存,数量为:"+addAmout);
        int newValue = goodsData.compute(goodsId, new BiFunction<String, Integer, Integer>() {
            public Integer apply(String s, Integer integer) {
                return integer == null ? addAmout : integer + addAmout;
            }
        });
        logger.info("+++++++++++++++++商品:"+goodsId+"库存,数量变为:"+newValue);
    }

    //减少库存
    public void outDepot(String goodsId,int reduceAmout){
        logger.info("-------------------减少商品:"+goodsId+"库存,数量为:"+reduceAmout);
        int newValue = goodsData.compute(goodsId, new BiFunction<String, Integer, Integer>() {
            public Integer apply(String s, Integer integer) {
                return integer == null ? 0 : integer - reduceAmout;
            }
        });
        logger.info("-------------------商品:"+goodsId+"库存,数量变为:"+newValue);
    }

    public int getGoodsAmount(String goodsId){
        return goodsData.get(goodsId);
    }
}

3. 在工程RabbitMQDepot 新建一个库存服务管理

package com.study.demo.service;

import com.study.demo.vo.GoodTransferVo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * 
 * @Description: 库存服务管理
 * @author leeSmall
 * @date 2018年9月19日
 *
 */
@Service
public class DepotManager {

    @Autowired
    private Depot depot;

    public void operDepot(GoodTransferVo goodTransferVo){
        if(goodTransferVo.isInOrOut()){
            depot.inDepot(goodTransferVo.getGoodsId(),goodTransferVo.getChangeAmount());
        }else{
            depot.outDepot(goodTransferVo.getGoodsId(),goodTransferVo.getChangeAmount());
        }
    }



}

4. 新建/RabbitMQDepot/src/main/java/applicationContext.xml配置文件,配置RabbitMQ

<?xml version="1.0" encoding="UTF-8"?>
<!-- 查找最新的schemaLocation 访问 http://www.springframework.org/schema/ -->
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:jee="http://www.springframework.org/schema/jee"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:task="http://www.springframework.org/schema/task"
       xmlns:rabbit="http://www.springframework.org/schema/rabbit"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
    http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd
    http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
    http://www.springframework.org/schema/tx  http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
    http://www.springframework.org/schema/aop  http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
    http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.0.xsd
    http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit-2.0.xsd">

     <!-- 配置扫描路径 -->
     <context:component-scan base-package="com.study.demo">
         <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
     </context:component-scan>

    <!-- rabbitMQ配置 -->
    <bean id="rabbitConnectionFactory"
          class="org.springframework.amqp.rabbit.connection.CachingConnectionFactory">
        <constructor-arg value="127.0.0.1"/>
        <property name="username" value="guest"/>
        <property name="password" value="guest"/>
        <property name="channelCacheSize" value="8"/>
        <property name="port" value="5672"></property>
    </bean>
    <rabbit:admin connection-factory="rabbitConnectionFactory"/>

    <!--配置队列  -->
    <rabbit:queue name="depot_queue" durable="true"/>

    <!--队列和交换器绑定  -->
    <rabbit:direct-exchange name="depot-amount-exchange"
          xmlns="http://www.springframework.org/schema/rabbit" durable="true">
        <rabbit:bindings>
            <rabbit:binding queue="depot_queue" key="amount.depot" ></rabbit:binding>
        </rabbit:bindings>
    </rabbit:direct-exchange>

    <!-- 对消息要手动确认 -->
    <rabbit:listener-container connection-factory="rabbitConnectionFactory"
                               acknowledge="manual">

    </rabbit:listener-container>

</beans>  

5. 在工程RabbitMQDepot 新建一个消息机制处理库存类

package com.study.demo.mq;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.core.ChannelAwareMessageListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.google.gson.Gson;
import com.rabbitmq.client.Channel;
import com.study.demo.service.DepotManager;
import com.study.demo.vo.GoodTransferVo;

/**
 * 
 * @Description: 消息机制处理库存
 * @author leeSmall
 * @date 2018年9月19日
 *
 */
@Service
public class ProcessDepot  implements ChannelAwareMessageListener {

    private static Logger logger = LoggerFactory.getLogger(ProcessDepot.class);

    @Autowired
    private DepotManager depotManager;

    private static Gson gson = new Gson();

    @Override
    public void onMessage(Message message, Channel channel) throws Exception {
        try {
            String msg = new String(message.getBody());
            logger.info(">>>>>>>>>>>>>>接收到消息:"+msg);
            GoodTransferVo goodTransferVo = gson.fromJson(msg,GoodTransferVo.class);
            try {
                depotManager.operDepot(goodTransferVo);
                channel.basicAck(message.getMessageProperties().getDeliveryTag(),
                        false);
                logger.info(">>>>>>>>>>>>>>库存处理完成,应答Mq服务");
            } catch (Exception e) {
                logger.error(e.getMessage());
                channel.basicNack(message.getMessageProperties().getDeliveryTag(),
                        false,true);
                logger.info(">>>>>>>>>>>>>>库存处理失败,拒绝消息,要求Mq重新派发");
                throw e;
            }

        } catch (Exception e) {
            logger.error(e.getMessage());
        }
    }


}

6. 在/RabbitMQDepot/src/main/java/applicationContext.xml配置消息机制处理库存

<?xml version="1.0" encoding="UTF-8"?>
<!-- 查找最新的schemaLocation 访问 http://www.springframework.org/schema/ -->
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:jee="http://www.springframework.org/schema/jee"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:task="http://www.springframework.org/schema/task"
       xmlns:rabbit="http://www.springframework.org/schema/rabbit"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
    http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd
    http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
    http://www.springframework.org/schema/tx  http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
    http://www.springframework.org/schema/aop  http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
    http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.0.xsd
    http://www.springframework.org/schema/rabbit http://www.springframework.org/schema/rabbit/spring-rabbit-2.0.xsd">

     <!-- 配置扫描路径 -->
     <context:component-scan base-package="com.study.demo">
         <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
     </context:component-scan>

    <!-- rabbitMQ配置 -->
    <bean id="rabbitConnectionFactory"
          class="org.springframework.amqp.rabbit.connection.CachingConnectionFactory">
        <constructor-arg value="127.0.0.1"/>
        <property name="username" value="guest"/>
        <property name="password" value="guest"/>
        <property name="channelCacheSize" value="8"/>
        <property name="port" value="5672"></property>
    </bean>
    <rabbit:admin connection-factory="rabbitConnectionFactory"/>

    <!--配置队列  -->
    <rabbit:queue name="depot_queue" durable="true"/>

    <!--队列和交换器绑定  -->
    <rabbit:direct-exchange name="depot-amount-exchange"
          xmlns="http://www.springframework.org/schema/rabbit" durable="true">
        <rabbit:bindings>
            <rabbit:binding queue="depot_queue" key="amount.depot" ></rabbit:binding>
        </rabbit:bindings>
    </rabbit:direct-exchange>

    <!-- 对消息要手动确认 -->
    <rabbit:listener-container connection-factory="rabbitConnectionFactory"
                               acknowledge="manual">
        <rabbit:listener queues="depot_queue" ref="processDepot"
                         method="onMessage" />
    </rabbit:listener-container>

</beans>  

7. 新增/RabbitMQDepot/src/main/java/spring-mvc.xml配置文件

<?xml version="1.0" encoding="UTF-8"?>  
<!-- 查找最新的schemaLocation 访问 http://www.springframework.org/schema/ -->
<beans xmlns="http://www.springframework.org/schema/beans"   
       xmlns:aop="http://www.springframework.org/schema/aop"   
       xmlns:context="http://www.springframework.org/schema/context"  
       xmlns:mvc="http://www.springframework.org/schema/mvc"   
       xmlns:tx="http://www.springframework.org/schema/tx"   
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
       xsi:schemaLocation="http://www.springframework.org/schema/aop   
        http://www.springframework.org/schema/aop/spring-aop-4.0.xsd   
        http://www.springframework.org/schema/beans   
        http://www.springframework.org/schema/beans/spring-beans-4.0.xsd   
        http://www.springframework.org/schema/context   
        http://www.springframework.org/schema/context/spring-context-4.0.xsd   
        http://www.springframework.org/schema/mvc   
        http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd   
        http://www.springframework.org/schema/tx   
        http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">

<!--    <mvc:default-servlet-handler />-->
    <mvc:resources mapping="/js/**" location="/js/"/>
    <mvc:annotation-driven
            content-negotiation-manager="contentNegotiationManager" />

    <context:component-scan base-package="com.study.demo.controller">
<!--        <context:include-filter type="annotation"
                                expression="org.springframework.stereotype.Controller" />-->
    </context:component-scan>


    <bean id="stringHttpMessageConverter"
          class="org.springframework.http.converter.StringHttpMessageConverter">
        <property name="supportedMediaTypes">
            <list>
                <bean class="org.springframework.http.MediaType">
                    <constructor-arg index="0" value="text" />
                    <constructor-arg index="1" value="plain" />
                    <constructor-arg index="2" value="UTF-8" />
                </bean>
            </list>
        </property>
    </bean>
    <bean id="mappingJacksonHttpMessageConverter"
          class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter" />

    <bean
            class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="messageConverters">
            <list>
                <ref bean="stringHttpMessageConverter" />
                <ref bean="mappingJacksonHttpMessageConverter" />
            </list>
        </property>
    </bean>

    <bean id="contentNegotiationManager"
          class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
        <property name="mediaTypes">
            <map>
                <entry key="html" value="text/html" />
                <entry key="pdf" value="application/pdf" />
                <entry key="xsl" value="application/vnd.ms-excel" />
                <entry key="xml" value="application/xml" />
                <entry key="json" value="application/json" />
            </map>
        </property>
        <property name="defaultContentType" value="text/html" />
    </bean>

    <bean id="viewResolver"
          class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
        <property name="order" value="0" />
        <property name="contentNegotiationManager" ref="contentNegotiationManager" />

        <property name="viewResolvers">
            <list>
                <bean class="org.springframework.web.servlet.view.BeanNameViewResolver" />
                <bean
                        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
                    <property name="viewClass"
                              value="org.springframework.web.servlet.view.JstlView" />
                    <property name="prefix" value="/WEB-INF/views/" />
                    <property name="suffix" value=".jsp"></property>
                </bean>
            </list>
        </property>

        <property name="defaultViews">
            <list>
                <bean
                        class="org.springframework.web.servlet.view.json.MappingJackson2JsonView">
                    <property name="extractValueFromSingleKeyModel" value="true" />
                </bean>
            </list>
        </property>
    </bean>

</beans>  

8. 新增/RabbitMQDepot/src/main/webapp/WEB-INF/web.xml配置文件

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         version="3.0">
  <display-name>RabbitMQDepot</display-name>

  <servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>*.js</url-pattern>
  </servlet-mapping>

  <!-- Spring 编码过滤器 start -->
  <filter>
    <filter-name>characterEncoding</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
    <init-param>
      <param-name>forceEncoding</param-name>
      <param-value>true</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>characterEncoding</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  <!-- Spring 编码过滤器 End -->

  <!-- Spring Application Context Listener Start -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
  </context-param>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <!-- Spring Application Context Listener End -->


  <!-- Spring MVC Config Start -->
  <servlet>
    <servlet-name>SpringMVC</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:spring-mvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>SpringMVC</servlet-name>
    <!-- Filter all resources -->
    <url-pattern>/</url-pattern>
  </servlet-mapping>
  <!-- Spring MVC Config End -->

</web-app>

到此库存系统代码编写完成!

9. 在Tomcat v8.5 8081启动RabbitMQDepot

98_8.png

10. 在下订单页面模拟下订单,查看控制台状态

98_9.png

库存系统状态:

98_10.png

订单系统状态:

98_11.png

98_12.png

示例代码获取地址

来源:https://www.cnblogs.com/leeSmall/category/1299598.html

文章永久链接:https://tech.souyunku.com/?p=14451

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