springMVC国际化配置和使用

下面是基于session的，springMVC国际花的一个例子：　　　　

需求是

输入url：展示中文界面

http://localhost:8080/MySSM/user?lang=zh

输入url:  展示英文界面

http://localhost:8080/MySSM/user?lang=en

下面是我demo项目的例子使用：

1.工程结构：

2.springMVC配置文件中 国际化相关的配置：

    <!-- 存储区域设置信息
         SessionLocaleResolver类通过一个预定义会话名将区域化信息存储在会话中。
     -->
    <bean id="localeResolver" class="org.springframework.web.servlet.i18n.SessionLocaleResolver" />
    
    <!-- 国际化资源文件 -->
    <bean id="messageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
        <property name="basename" value="classpath: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>
        <!-- 该拦截器通过名为”lang”的参数来拦截HTTP请求，使其重新设置页面的区域化信息 -->
        <!-- <bean class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor" />  -->
        <bean class="com.cy.interceptor.LanguageInterceptor">
            <property name="paramName" value="lang" />
        </bean>
    </mvc:interceptors>

注意我重新使用了自己的拦截器：com.cy.interceptor.LanguageInterceptor

因为原来的拦截器org.springframework.web.servlet.i18n.LocaleChangeInterceptor，浏览器必须要输入lang=en_US，lang=zh_CN,才能改变语言。但是觉得输入这么多麻烦，因为一般就认为zh中文，en英文了。

3.语言LanguageInterceptor.java:

我只是把LocaleChangeInterceptor源代码拷贝了一部分过来；做些修改，主要是：

localeResolver.setLocale(request, response, newLocale)设置语言了；

package com.cy.interceptor;

import java.util.Locale;

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

import org.springframework.web.servlet.LocaleResolver;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
import org.springframework.web.servlet.support.RequestContextUtils;

/**
 * 语言拦截器
 * @author CY
 *
 */
public class LanguageInterceptor extends HandlerInterceptorAdapter{
    
    /**
     * Default name of the locale specification parameter: "locale".
     */
    public static final String DEFAULT_PARAM_NAME = "locale";
    private String paramName = DEFAULT_PARAM_NAME;
    
    public void setParamName(String paramName) {
        this.paramName = paramName;
    }
    public String getParamName() {
        return this.paramName;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        Locale newLocale = getLocale(request.getParameter(getParamName()));
        LocaleResolver localeResolver = RequestContextUtils.getLocaleResolver(request);
        
        if (localeResolver == null) {
            throw new IllegalStateException("No LocaleResolver found: not in a DispatcherServlet request?");
        }
        
        localeResolver.setLocale(request, response, newLocale);
        
        return true;
    }
    

    //根据language 获取Locale
    public static Locale getLocale(String language){
        Locale locale = new Locale("zh", "CN");
        if(language!=null && language.equals("en")){
            locale = new Locale("en", "US");
        }
        
        return locale;
    }
    
}

4.如果想在controller中获取messages配置文件中的值怎么做呢？

下面是一部分代码：

import org.springframework.web.servlet.support.RequestContext;
import org.springframework.web.servlet.support.RequestContextUtils;
import java.util.ResourceBundle;

@Controller
public class UserController {
    private static Logger logger = Logger.getLogger(UserController.class);
    
    @Autowired
    private UserService userService;
    
    
    /**
     * 从国际化资源配置文件中根据key获取value  方法一
     * @param request
     * @param key
     * @return
     */
    public static String getMessage(HttpServletRequest request, String key){
        Locale currentLocale = RequestContextUtils.getLocale(request);
        String lang = currentLocale.getLanguage();
        ResourceBundle bundle = ResourceBundle.getBundle("messages_"+lang, currentLocale);
        return bundle.getString(key);
    }
    /**
     * 从国际化资源配置文件中根据key获取value  方法二
     * @param request
     * @param key
     * @return
     */
    public static String getMessage2(HttpServletRequest request, String key){
        RequestContext requestContext = new RequestContext(request);
        String value = requestContext.getMessage(key);
        return value;
    }
    
    
    @RequestMapping("/user")
    public ModelAndView getUsers(HttpServletRequest request){
        List<VoUser> userList = userService.getUsers();
        
         ModelAndView mv =  new ModelAndView();
         
         //从message中获取文字
         //String showUserInfo = getMessage(request, "showUserInfo");
         String showUserInfo = getMessage2(request, "showUserInfo");
         
         mv.addObject("showUserInfo", showUserInfo);
         mv.addObject("userList", userList);
         mv.setViewName("user");
         return mv;
    }
    
}

5.jsp中使用spring:message code:主要是：

<%@ taglib prefix="spring" uri="http://www.springframework.org/tags" %>

<spring:message code="userName"/>

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link rel="stylesheet" type="text/css" href="resources/bootstrap/bootstrap.min.css">
<title><spring:message code="userManage"/></title>
<style type="text/css">
.container{
    margin-top: 30px;
}
.imgclass{
    height: 100px;
}
</style>
</head>
<body>

<div class="container">
    <p class="text-center bg-success">${showUserInfo}</p>
    <div class="form-horizontal">
        <c:forEach var="user" items="${userList }">
          <div class="form-group">
            <label for="inputEmail3" class="col-sm-2 control-label"><spring:message code="userName"/></label>
            <div class="col-sm-10">
              <input class="form-control" placeholder="Email" value="${user.name }">
            </div>
          </div>
          <div class="form-group">
            <label for="inputPassword3" class="col-sm-2 control-label"><spring:message code="age"/></label>
            <div class="col-sm-10">
              <input class="form-control" placeholder="Password" value="${user.age }">
            </div>
          </div>
          <div class="form-group">
            <label for="inputPassword3" class="col-sm-2 control-label"><spring:message code="photoName"/></label>
            <div class="col-sm-10">
              <input class="form-control" value="${user.photoName }">
            </div>
          </div>
          <div class="form-group">
            <label for="inputPassword3" class="col-sm-2 control-label"><spring:message code="photo"/></label>
            <div class="col-sm-10">
                <img class="imgclass" src="getImg?username=${user.name }&photoName=${user.photoName}"/>
            </div>
          </div>
        </c:forEach>
        <div class="form-group">
            <div class="col-sm-offset-2 col-sm-10">
              <a href="toAddUser" class="btn btn-default"><spring:message code="addUser"/></a>
            </div>
         </div>
    </div>    

</div>
</body>
<script src="resources/js/jquery.min.js"></script>
<script src="resources/bootstrap/bootstrap.min.js"></script>
<script type="text/javascript">
$(function(){
    
});
</script>
</html>

6.messages_zh.properties和messages_en.properties配置：

userManage=userManagement
userName=username
age=age
photoName=photo name
photo=photo
addUser=add user
showUserInfo=this is display user information

userManage=u7528u6237u7BA1u7406
userName=u59D3u540D
age=u5E74u9F84
photoName=u7167u7247u540Du79F0
photo=u7167u7247
addUser=u589Eu52A0u7528u6237
showUserInfo=u8FD9u91CCu662Fu5C55u73B0u7528u6237u4FE1u606F

效果：

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