一、目的

针对不同地区，设置不同的语言信息。

SpringBoot国际化配置文件默认放在classpath:message.properties，如果自定义消息配置文件，需要application.properties或application.yml中设置spring.messages.basename的值。

二、步骤

在src/main/resources 下建i18n文件夹

在i18n文件夹中建立messages.properties 找不到语言配置时，使用此文件

hello=你好_默认

在i18n文件夹中建立messages_en_US.properties 英文语言配置

hello=hello_English

在i18n文件夹中建立messages_zh_CN.properties 中文语言配置

hello=你好_中文

MessageConfig.java

对消息的配置

package com.spring.security.config.spring;

import java.util.Locale;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.i18n.LocaleContext;
import org.springframework.context.support.ResourceBundleMessageSource;
import org.springframework.util.Assert;
import org.springframework.web.servlet.LocaleResolver;
import org.springframework.web.servlet.i18n.AbstractLocaleContextResolver;
import org.springframework.web.servlet.i18n.LocaleChangeInterceptor;
import org.springframework.web.servlet.i18n.SessionLocaleResolver;

@Configuration
public class MessageConfig extends AbstractLocaleContextResolver{

    @Value("${spring.messages.basename}")
    public String[] basenames;

    @Bean(name = "messageSource")
    public ResourceBundleMessageSource resourceBundleMessageSource() {
        ResourceBundleMessageSource source = new ResourceBundleMessageSource();
        if (basenames != null) {
            for (int i = 0; i < basenames.length; i++) {
                String basename = basenames[i];
                Assert.hasText(basename, "Basename must not be empty");
                this.basenames[i] = basename.trim();
            }
            source.setBasenames(basenames);
        } else {
            this.basenames = new String[0];
            source.setBasename(basenames[0]);
        }
        source.setDefaultEncoding("UTF-8");
        source.setUseCodeAsDefaultMessage(true);
        return source;
    }

    @Bean
    public LocaleResolver localeResolver() {
        SessionLocaleResolver slr = new SessionLocaleResolver();
        slr.setDefaultLocale(Locale.SIMPLIFIED_CHINESE);
        return slr;
    }

    /**
     * 国际化，设置url识别参数
     *
     * @return
     */
    @Bean
    public LocaleChangeInterceptor localeChangeInterceptor() {
        LocaleChangeInterceptor lci = new LocaleChangeInterceptor();
        lci.setParamName("lang");
        return lci;
    }

    @Override
    public LocaleContext resolveLocaleContext(HttpServletRequest request) {
        return null;
    }

    @Override
    public void setLocaleContext(HttpServletRequest request, HttpServletResponse response,
            LocaleContext localeContext) {
    }
}

SpringUtils.java

Spring工具类，用于获取ApplicationContext

package com.spring.security.common.utils;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Service;

/**
 * Spring容器
 */
@Service
public class SpringUtils implements ApplicationContextAware {

    private static ApplicationContext context = null;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        if (context == null) {
            context = applicationContext;
        }
    }

    /**
     * 获取容器
     *
     * @return 容器
     */
    public static ApplicationContext getContext() {
        return context;
    }
}

MessageUtils.java

封装获取message的工具类

package com.spring.security.common.utils;

import java.util.Locale;

import org.springframework.context.i18n.LocaleContextHolder;
import org.springframework.context.support.ReloadableResourceBundleMessageSource;

public class MessageUtils {

    public static String getMessage(String code) {
         Locale locale = LocaleContextHolder.getLocale();
         ReloadableResourceBundleMessageSource reloadableResourceBundleMessageSource = new ReloadableResourceBundleMessageSource();
         String message = reloadableResourceBundleMessageSource.getMessage(code, null, locale);
         return message;
    }
}

** WebMvcConfig.java**

mvc配置，解决跨域，接口中文乱码，添加语言拦截器

package com.spring.security.config.spring;

import java.nio.charset.Charset;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
import org.springframework.web.servlet.i18n.LocaleChangeInterceptor;

@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {

    @Autowired
    private LocaleChangeInterceptor localeChangeInterceptor;

    /**
     * 解决跨域
     */
    @Override
    protected void addCorsMappings(CorsRegistry registry) {
        registry
        .addMapping("/**")
        .allowedHeaders("*")
        .allowedMethods("*")
        .allowedOrigins("*")
        .allowCredentials(true);
    }

    /**
     * 配置消息转换器
     * 解决返回String乱码
     */
    @Override
    protected void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        super.configureMessageConverters(converters);
        converters.add(responseBodyConverter());
    }

    @Bean
    public HttpMessageConverter<String> responseBodyConverter() {
        return new StringHttpMessageConverter(Charset.forName("UTF-8"));
    }

    @Override
    protected void addInterceptors(InterceptorRegistry registry) {
        super.addInterceptors(registry);
        registry.addInterceptor(localeChangeInterceptor);
    }

}

三、测试

测试接口：

package com.spring.security.controller;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import com.spring.security.common.utils.I18nUtils;

@RestController
public class TestController {

    @GetMapping("/test")
    public String doTest() {
        return I18nUtils.getMessage("hello");
    }
}