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Apache Maven(一):快速入门

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Maven 是什么?

Maven 是一个项目管理和整合工具。Maven 为开发者提供了一套完整的构建生命周期框架。开发团队几乎不用花多少时间就能够自动完成工程的基础构建配置,因为 Maven 使用了一个标准的目录结构和一个默认的构建生命周期。

在有多个开发团队环境的情况下,Maven 能够在很短的时间内使得每项工作都按照标准进行。因为大部分的工程配置操作都非常简单并且可复用,在创建报告、检查、构建和测试自动配置时,Maven 可以让开发者的工作变得更简单。

Maven 安装

这里介绍一下在Windows 系统上安装Maven。注:Maven 3.3+ 需要JDK 1.7或更高版本才能执行

Maven 的下载地址:官方下载

109_1.png

我们将下载下来的zip文件,解压到本地磁盘目录,然后配置环境变量。

环境变量配置(windows7为例):

1、添加M2_HOME 和 MAVEN_HOME 环境变量。注:Maven 说只是添加 M2_HOME , 但一些项目仍引用 Maven 的文件夹 MAVEN_HOME, 因此,为了安全也把它添加进去

109_2.png

2、更新Path变量的变量值。在最后追加

109_3.png

命令:mvn -v 或 mvn -version: 查看Maven版本信息,并确定是否安装成。

C:\Users\Administrator>mvn -v
Apache Maven 3.5.3 (3383c37e1f9e9b3bc3df5050c29c8aff9f295297; 2018-02-25T03:49:0
5+08:00)
Maven home: D:\apache-maven-3.5.3\bin\..
Java version: 1.8.0_161, vendor: Oracle Corporation
Java home: D:\DevSoft\jdk1.8.0_161
Default locale: zh_CN, platform encoding: GBK
OS name: "windows 7", version: "6.1", arch: "amd64", family: "windows"

如果你看到类似消息,说明 Apache Maven 在 Windows 上已安装成功。

第一个Maven项目

可以在项目目录下执行如下命令:会在你的项目路径下生成一个名称为hello的Maven项目。

mvn archetype:generate -DgroupId=com.cnblogs.hello -DartifactId=hello -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false 

hello目录结构如下图:

109_4.png

所有的源代码放在文件夹 /src/main/java/, 所有的单元测试代码放入 /src/test/java/。

pom.xml文件内容:该文件是在Maven项目中的核心配置文件。它是一个单独的配置文件,其中包含以您构建项目所需的大部分信息。后面我会详细介绍这个文件。

 <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.cnblogs.hello</groupId>
   <artifactId>hello</artifactId>
   <packaging>jar</packaging>
   <version>1.0-SNAPSHOT</version>
   <name>hello</name>
   <url>http://maven.apache.org</url>
   <dependencies>
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
       <version>3.8.1</version>
       <scope>test</scope>
     </dependency>
   </dependencies>
 </project>

接下来执行命令:mvn package 将项目进行打包处理。注:这个命令必须在hello项目木木下执行即:D:\MavenWork\hello目录

D:\MavenWork\hello>mvn package
[INFO] Scanning for projects...
[INFO]
[INFO] ----------------------< com.cnblogs.hello:hello >-----------------------
[INFO] Building hello 1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ hello ---
[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e
. build is platform dependent!
[INFO] skip non existing resourceDirectory D:\MavenWork\hello\src\main\resources

[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ hello ---
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding GBK, i.e. buil
d is platform dependent!
[INFO] Compiling 1 source file to D:\MavenWork\hello\target\classes
[INFO]
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ he
llo ---
[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e
. build is platform dependent!
[INFO] skip non existing resourceDirectory D:\MavenWork\hello\src\test\resources

[INFO]
[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ hello -
--
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding GBK, i.e. buil
d is platform dependent!
[INFO] Compiling 1 source file to D:\MavenWork\hello\target\test-classes
[INFO]
[INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ hello ---
[INFO] Surefire report directory: D:\MavenWork\hello\target\surefire-reports
Downloading from alimaven: http://maven.aliyun.com/nexus/content/groups/public/o
rg/apache/maven/surefire/surefire-junit3/2.12.4/surefire-junit3-2.12.4.pom
Downloaded from alimaven: http://maven.aliyun.com/nexus/content/groups/public/or
g/apache/maven/surefire/surefire-junit3/2.12.4/surefire-junit3-2.12.4.pom (1.7 k
B at 740 B/s)
Downloading from alimaven: http://maven.aliyun.com/nexus/content/groups/public/o
rg/apache/maven/surefire/surefire-providers/2.12.4/surefire-providers-2.12.4.pom

Downloaded from alimaven: http://maven.aliyun.com/nexus/content/groups/public/or
g/apache/maven/surefire/surefire-providers/2.12.4/surefire-providers-2.12.4.pom
(2.3 kB at 1.0 kB/s)
Downloading from alimaven: http://maven.aliyun.com/nexus/content/groups/public/o
rg/apache/maven/surefire/surefire-junit3/2.12.4/surefire-junit3-2.12.4.jar
Downloaded from alimaven: http://maven.aliyun.com/nexus/content/groups/public/or
g/apache/maven/surefire/surefire-junit3/2.12.4/surefire-junit3-2.12.4.jar (26 kB
 at 10 kB/s)

-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running com.cnblogs.hello.AppTest
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.004 sec

Results :

Tests run: 1, Failures: 0, Errors: 0, Skipped: 0

[INFO]
[INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ hello ---
[INFO] Building jar: D:\MavenWork\hello\target\hello-1.0-SNAPSHOT.jar
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 10.482 s
[INFO] Finished at: 2018-06-15T14:46:34+08:00
[INFO] ------------------------------------------------------------------------

最后执行java命令进行测试打包生成的jar

java -cp target/hello-1.0-SNAPSHOT.jar com.cnblogs.hello.App

结果打印如下:

Hello World!

最后生成站点,执行命令:mvn site

mvn site

执行命令会会根据项目的信息生成一个网站。您可以查看target/site下生成的文档。

通过快速入门我可以简单了解Maven的一些功能,这只是一个快速入门指南。后续几章会有更全面的详细介绍。

文章永久链接:https://tech.souyunku.com/?p=13808


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