基于session的国际化实现方式

<!-- 国际换的service依赖于他，所以从mvc提到前面 -->
    <bean id="messageSource"
        class="org.springframework.context.support.ResourceBundleMessageSource">
        <!-- 国际化信息所在的文件名 -->
        <property name="basename" value="messages/messages" />
        <!-- 如果在国际化资源文件中找不到对应代码的信息，就用这个代码作为名称 -->
        <property name="useCodeAsDefaultMessage" value="true" />
    </bean>

<mvc:interceptors>
      <!-- 国际化操作拦截器 如果采用基于（请求/Session/Cookie/url）则必需配置 -->
      <bean class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor" />
  </mvc:interceptors>
  <!-- 基于session的国际化 -->
  <bean id="localeResolver"
      class="org.springframework.web.servlet.i18n.SessionLocaleResolver" />

public interface I18nSessionService {
  
  public void setRc(RequestContext rc);
  
  public String getMessage(String key); 
  
  public String getMessage(String key,Object info);
  
  public String getMessage(String key,Object...objects);
}

@Service
@Scope(value = WebApplicationContext.SCOPE_SESSION,
      proxyMode = ScopedProxyMode.INTERFACES)
public class I18nSessionServiceImpl implements I18nSessionService {

  @Autowired  
  @Qualifier("messageSource")  
  private MessageSource resources;
  //前端设置切换语言是设置
  RequestContext rc ;
  
  public RequestContext getRc() {
      return rc;
  }

  @Override
  public void setRc(RequestContext rc) {
      this.rc = rc;
  }

  @Override
  public String getMessage(String key) {
      // TODO Auto-generated method stub
      if(null != getRc()){
          return getRc().getMessage(key);
      }
      return resources.getMessage(key, null, null);
  }

  @Override
  public String getMessage(String key, Object info) {
      // TODO Auto-generated method stub
      if(null != getRc()){
          return getRc().getMessage(key, new Object[]{info});
      }
      return resources.getMessage(key, new Object[]{info}, null);
  }

  @Override
  public String getMessage(String key, Object... objects) {
              if(null != getRc()){
                  return getRc().getMessage(key, objects);
              }
              return resources.getMessage(key, objects, null);
  }
}

@Resource
  //注入I18nSessionService后在session作用域中更改local
  private I18nSessionService i18nSessionService;

  @RequestMapping(value = "/turnLanguage", method = { RequestMethod.POST, RequestMethod.GET })
  public void TurnLanguage(HttpServletRequest request,
          @RequestParam(value = "langType", defaultValue = "zh") String langType) {
      if (langType.equals("zh")) {
          Locale locale = new Locale("zh", "CN");
          request.getSession().setAttribute(SessionLocaleResolver.LOCALE_SESSION_ATTRIBUTE_NAME, locale);
      } else if (langType.equals("en")) {
          Locale locale = new Locale("en", "US");
          request.getSession().setAttribute(SessionLocaleResolver.LOCALE_SESSION_ATTRIBUTE_NAME, locale);
      } else {
          request.getSession().setAttribute(SessionLocaleResolver.LOCALE_SESSION_ATTRIBUTE_NAME,
                  LocaleContextHolder.getLocale());
      }
      RequestContext requestContext = new RequestContext(request);
      i18nSessionService.setRc(requestContext);
  }

@Resource
   private I18nSessionService is;
   @RequestMapping(value="/nation",method={RequestMethod.POST,RequestMethod.GET})
   @ResponseBody
   public Result test(HttpServletRequest request){//, @RequestParam(value="langType", defaultValue="zh") String langType
       String msg = is.getMessage("argument.required","userDao");
       return new Result(true, msg, "返回数据");
   }