1、配置文件

spring:
  messages:
    basename: i18n/messages
    cache-second: 3600
    encoding: UTF-8

注意点：springboot2.0 cache-seconds改为：cache-second

2、在resource下新建

image.png

3、在文件里添加内容

messages.properties：welcome = 欢迎
messages_zh_CN.properties：welcome = 欢迎
messages_en_US.properties：welcome= welcome
#（messages.properties默认文件，当找不到语言的配置的时候，使用该文件进行展示）。

4、封装国际化工具类

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.MessageSource;
import org.springframework.context.i18n.LocaleContextHolder;
import org.springframework.stereotype.Component;

import java.util.Locale;

@Component
public class LocaleMessage {

    @Autowired
    private MessageSource messageSource;

    /**
     * @param code：对应文本配置的key.
     * @return 对应地区的语言消息字符串
     */
    public String getMessage(String code){
        return this.getMessage(code,new Object[]{});
    }

    public String getMessage(String code,String defaultMessage){
        return this.getMessage(code,null,defaultMessage);
    }

    public String getMessage(String code,String defaultMessage,Locale locale){
        return this.getMessage(code,null,defaultMessage,locale);
    }

    public String getMessage(String code,Locale locale){
        return this.getMessage(code,null,"",locale);
    }

    public String getMessage(String code,Object[] args){
        return this.getMessage(code,args,"");
    }

    public String getMessage(String code,Object[] args,Locale locale){
        return this.getMessage(code,args,"",locale);
    }

    public String getMessage(String code,Object[] args,String defaultMessage){
        Locale locale = LocaleContextHolder.getLocale();
        return this.getMessage(code,args, defaultMessage,locale);
    }

    public String getMessage(String code,Object[]args,String defaultMessage,Locale locale){
        return messageSource.getMessage(code,args, defaultMessage,locale);
    }

}

5、新增controller

import com.stylefeng.guns.core.util.LocaleMessage;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

@RestController
public class HelloController {

    @Resource
    private LocaleMessage localeMessage;




    @RequestMapping("/hello")
    public String hello(){
        System.out.println("1");
        String msg3 = localeMessage.getMessage("welcome");

        System.out.println(msg3);
        return msg3;


    }
}

6、浏览器上测试。