基于请求URL的国际化实现方式
原理：使用spring的request bean保存相应的国际化组件，这样保证同一个请求的国际化相同，也是在微服务处理国际化的一种方式。需要针对每个请求做不同的国际化
实现所以需要，相应的拦截器去处理对应请求域中的国际化组件
- 配置文件：
- spring容器配置applicationContext.xml，中添加取得信息的messageSource，放在spring容器而非springmvc容器加载是因为代码中有Service的注解依赖于他
<!-- 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" />
<property name="defaultEncoding" value="UTF-8"/>
<!-- 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>
- springmvc容器配置拦截器，注意拦截器的顺序，国际化的拦截器在处理请求的拦截器前面
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/**"/>
<!-- 国际化操作拦截器 如果采用基于（请求/Session/Cookie）则必需配置 -->
<bean id="localeChangeInterceptor"
class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor">
<property name="paramName" value="locale"/>
</bean>
</mvc:interceptor>
<mvc:interceptor>
<!-- 需拦截的地址 -->
<!-- 级目录 -->
<mvc:mapping path="/*" />
<mvc:mapping path="/*/*" />
<!-- 需排除拦截的地址 -->
<mvc:exclude-mapping path="/*.html"/>
<bean class="cn.xx.xx.xx.interceptor.ControllerInterceptor" />
</mvc:interceptor>
</mvc:interceptors>
<!-- 基于url的国际化 id必须为localeResolver否则国际化组件无法识别，UrlAcceptHeaderLocaleResolver为自定义实现部分-->
<bean id="localeResolver" class="cn.abcsys.devops.application.service.UrlAcceptHeaderLocaleResolver"/>
- UrlAcceptHeaderLocaleResolver作为localeResolver国际urlLocal
/**
* Copyright: Copyright (c) 2018 LanRu-Caifu
* @author xzg
* 2018年2月6日
* @ClassName: UrlAcceptHeaderLocaleResolver.java
* @Description: 国际化拦截请求后对请求更改Local
* @version: v1.0.0
*/
public class UrlAcceptHeaderLocaleResolver extends AcceptHeaderLocaleResolver {
private Locale urlLocal;
public Locale resolveLocale(HttpServletRequest request) {
return urlLocal != null?urlLocal:request.getLocale();
}
@Override
public void setLocale(HttpServletRequest request, HttpServletResponse response, Locale locale) {
urlLocal = locale;
}
}
- spring中的request bean依赖于接口实现，下面是其接口和对应的实现类
public interface I18nSessionService {
public void setRc(RequestContext rc);
public void setRcByRequest(HttpServletRequest request);
public String getMessage(String key);
public String getMessage(String key,Object info);
public String getMessage(String key,Object...objects);
}
- 下面注解主要为设置作用域为request，注入messageSource组件，并提供RequestContext用于切换语言配置国际化
@Component
@RequestScope(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
private RequestContext rc ;
public RequestContext getRc() {
return rc;
}
@Override
public void setRcByRequest(HttpServletRequest request) {
// TODO Auto-generated method stub
this.rc = new RequestContext(request);
}
@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);
}
}
- 自定义的拦截器中处理，国际化组件的请求bean
@Component
public class ControllerInterceptor implements HandlerInterceptor {
/**
* 在Controller方法前进行拦截
*/
@Resource
private I18nSessionService i18nSessionService;
private static Logger log = Logger.getLogger("ControllerInterceptor");
public boolean preHandle(HttpServletRequest request,
HttpServletResponse response, Object handler) throws Exception {
log.info("RequestURI :"+request.getRequestURI());
//解决跨域
response.setHeader("Access-Control-Allow-Origin", "*");
response.setHeader("Access-Control-Allow-Methods","POST");
response.setHeader("Access-Control-Allow-Headers","x-requested-with,content-type");
//拦截器中对所有的请求处理，保存到request bean中
i18nSessionService.setRcByRequest(request);
return true;
}
public void postHandle(HttpServletRequest request,
HttpServletResponse response, Object handler,
ModelAndView modelAndView) throws Exception {
}
/**
* 在Controller方法后进行拦截
*/
public void afterCompletion(HttpServletRequest request,
HttpServletResponse response, Object handler, Exception ex)
throws Exception {
}
}
- 使用方式
//发送请求 http://localhost:8080/testI18n.do?locale=en_US 或者http://localhost:8080/testI18n.do?locale=zh_CN
@Resource
private I18nSessionService is;
@RequestMapping(value = "/testI18n.do", method = { RequestMethod.POST,RequestMethod.GET})
public @ResponseBody
Result testI18n(){
return new Result(true, is.getMessage("argument.required"), "");
}
- 总结：以上就是基本实现过程。在微服务中由于服务发现提供的服务模块会自适应调整所以不适合使用session 的方式处理国际化。这里使用request和url将粒度划分的更细，处理也更灵活
