上一篇博客springMVC源码分析--国际化LocaleResolver(一)中我们介绍了springMVC提供的国际化的解决方案,接下来我们根据springMVC提供的解决方案来简单的实现一个多语言的支持。
一、基于Session的国际化实现
基于Session的国际化实现其实说来也简单,就是在Session中保存语言信息Locale,这样springMVC会从我们提供的多语言配置文件中读取相关语言的信息。
(1)首先我们需要配置springMVC的多语言配置,因为我们打算使用Session来实现,所有对于localeResolver我们要配置其实现类SessionLocaleResolver,在springMVC的配置文件中添加如下配置:
<bean id="localeResolver" class="org.springframework.web.servlet.i18n.SessionLocaleResolver"/>
(2)这里我们提供了一个多语言拦截器LanguageInterceptor,通过这个拦截器设置多语言信息,其实主要的代码就是request.getSession().setAttribute(SessionLocaleResolver.LOCALE_SESSION_ATTRIBUTE_NAME,locale),这样springMVC会根据Locale的信息来获得多语言。
public class LanguageInterceptor implements HandlerInterceptor{ @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { String language = request.getParameter("language"); if (language != null&&language.equals("zh")) { Locale locale = new Locale("zh", "CN"); request.getSession() .setAttribute( SessionLocaleResolver.LOCALE_SESSION_ATTRIBUTE_NAME, locale); request.setAttribute("language", language); } else if (language != null&&language.equals("en")) { Locale locale = new Locale("en", "US"); request.getSession() .setAttribute( SessionLocaleResolver.LOCALE_SESSION_ATTRIBUTE_NAME, locale); request.setAttribute("language", language); } else { request.getSession().setAttribute( SessionLocaleResolver.LOCALE_SESSION_ATTRIBUTE_NAME, LocaleContextHolder.getLocale()); language = LocaleContextHolder.getLocale().getLanguage(); request.setAttribute("language", language); } return true; } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { } }
在springMVC的配置文件中配置拦截器
<mvc:interceptors> <!-- 国际化操作拦截器 如果采用基于(请求/Session/Cookie)则必需配置 --> <bean class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor"/> <bean class="com.tianjunwei.interceptor.LanguageInterceptor"></bean> </mvc:interceptors>
在工程中添加多语言配置文件,在src/main/resources目录下新建messages目录,分别添加中英文的多语言配置文件message_en_US.properties和message_zh_CN.properties,文件中以key = value的形式保存多语言信息
运行结果图:
二、基于Cookie的国际化实现
与上面类似,我们首先创建一个拦截器用来将多语言信息写到Cookie中,这样就可以通过cookie来切换多语言了。
public class LanguageCookieInterceptor implements HandlerInterceptor{ @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { String language = request.getParameter("language"); if (language != null&&language.equals("zh")) { Locale locale = new Locale("zh", "CN"); (new CookieLocaleResolver()).setLocale (request, response, locale); request.setAttribute("language", language); } else if (language != null&&language.equals("en")) { Locale locale = new Locale("en", "US"); (new CookieLocaleResolver()).setLocale (request, response, locale); request.setAttribute("language", language); } else { (new CookieLocaleResolver()).setLocale (request, response, LocaleContextHolder.getLocale()); language = LocaleContextHolder.getLocale().getLanguage(); request.setAttribute("language", language); } return true; } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { } }
springMVC的配置文件如下:
<mvc:interceptors> <!-- 国际化操作拦截器 如果采用基于(请求/Session/Cookie)则必需配置 --> <bean class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor"/> <!-- <bean class="com.tianjunwei.interceptor.LanguageInterceptor"></bean> --> <bean class="com.tianjunwei.interceptor.LanguageCookieInterceptor"></bean> </mvc:interceptors> <bean id="localeResolver" class="org.springframework.web.servlet.i18n.CookieLocaleResolver"/>
这样我们也可以实现通过Session实现的效果。