struts--动态访问国际化资源（国家/语言切换）

骑猪看日落 2024-02-18 14:19 14阅读 0赞

要修改国家/语言其根本就是要修改请求中的request\_locale属性值！！！

目的：为动态地访问国际化资源文件，实现让用户自行选择语言的功能，只需要提供一个下拉列表框，在下拉列表框中列出本应用所支持的各种语言并且，当用户选择下拉列表中的某个选项时，系统将该下拉列表项的值设置为request\_locale参数提交（select的name属性设置为request\_locale）。

为此，可以将系统中支持的语言放在一个Map中，通过jsp页面中迭代该map对象，就可以在页面上列出应用所支持的全部语言。

案例：用户可自由切换语言。

登录界面i18n.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
    <%@ taglib prefix = "s" uri = "/struts-tags" %>
    <%
    String path = request.getContextPath();
    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
    %>
    
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
      <head>
        <base href="<%=basePath%>">
        
        <title>My JSP 'i18n.jsp' starting page</title>
        
    	<meta http-equiv="pragma" content="no-cache">
    	<meta http-equiv="cache-control" content="no-cache">
    	<meta http-equiv="expires" content="0">    
    	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    	<meta http-equiv="description" content="This is my page">
    	<script type="text/javascript">
    	  function changeLocale(){
    	    document.getElementById("form1").submit();
    	  }
    	</script>
    
      </head>
      
      <body>
        <s:set name = "session_locale" value = "#session.WW_TRANS_I18N_LOCALE"/>
        <s:bean name = "com.action.testI18n" id = "localeList">  
          <s:param name = "locale" value = "#session_locale"></s:param>
        </s:bean>
        
        <s:form action = "testI18n" method = "post" theme="simple" id = "form1">
          <s:text name="language"/>
          <s:select list="#session.map" listValue = "key" listKey = "value"
             name = "request_locale" onchange = "changeLocale()" >  
          </s:select>    
          
        </s:form>
       
       <s:form action = "login.action" method = "post">
            <s:textfield name = "username" key = "loginUser"/> 
            <s:password name = "password" key = "loginPassword"/>
            
            <s:submit key = "loginSubmit"/>
       </s:form>
       
      </body>
    </html>

Action:(testI18n.java)

package com.action;
    
    import java.util.HashMap;
    import java.util.Locale;
    import java.util.Map;
    import java.util.ResourceBundle;
    
    import com.opensymphony.xwork2.ActionContext;
    import com.opensymphony.xwork2.ActionSupport;
    
    public class testI18n extends ActionSupport {
    	private Locale locale;
    
    	public Locale getLocale() {
    		return locale;
    	}
    
    	public void setLocale(Locale locale) {
    		this.locale = locale;
    		getLocales();
    	}
    
    	public void getLocales(){    //关键代码
    		Map map = new HashMap(2);
    		if(locale == null){ //防止为空的情况！
    			locale = Locale.getDefault();
    		}
    		ResourceBundle resourceBundle = ResourceBundle.getBundle("globalMessage", locale);
    		map.put(resourceBundle.getString("huizhi.en"), Locale.US);
    		map.put(resourceBundle.getString("huizhi.cn"), Locale.CHINA);
    		ActionContext.getContext().getSession().put("map", map); //保存到session范围内
    	}
    
    	public String execute() {
    		return SUCCESS;
    	}
    }

国际化资源文件：globalMessage\_zh\_CN.properties

loginUser = \u7528\u6237\u540D
    loginPassword = \u7528\u6237\u5BC6\u7801
    loginSubmit = \u63D0\u4EA4
    language = \u9009\u62E9\u8BED\u8A00
    huizhi.en = \u7F8E\u56FD\u82F1\u8BED
    huizhi.cn = \u7B80\u4F53\u4E2D\u6587

globalMessage\_en\_US.propreties

loginUser = LoginUser
    loginPassword = LoginPassword
    loginSubmit =Submit
    language = select language
    huizhi.en = American English
    huizhi.cn = Simplified Chinese

Action（LoginAction）

package com.action;
    
    import com.opensymphony.xwork2.ActionContext;
    import com.opensymphony.xwork2.ActionSupport;
    
    public class LoginAction extends ActionSupport{
    	private String username;
    	private String password;
    	
      public String getUsername() {
    		return username;
    	}
    
    	public void setUsername(String username) {
    		this.username = username;
    	}
    
    	public String getPassword() {
    		return password;
    	}
    
    	public void setPassword(String password) {
    		this.password = password;
    	}
    	public String execute() {
    		return SUCCESS;
    	}
    
    }

struts.xml配置：

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN"
        "http://struts.apache.org/dtds/struts-2.1.7.dtd">
        
        <struts>
         <constant name="struts.custom.i18n.resources" value="globalMessage"/>
         
         <package name="default" extends="struts-default" namespace = "/">
         
            <action name="login" class = "com.action.LoginAction">
              <result>/welcome.jsp</result>
              <result name = "login">/index.jsp</result>
            </action>
            
            <action name = "testI18n" class = "com.action.testI18n">
              <result>/i18n.jsp</result>
            </action>
         </package>
        </struts>

完成效果：

![Center][]

![Center 1][]

有一点小问题就是当进行语言切换的时候，提交按钮的值value=""，如上图所示，不知原因，望路过的大佬指点，谢谢！

[Center]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/72b4c6d095f34aaebfd11bb9af019601.png
[Center 1]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/f917cd731fbd4dc8b2b055a80fc3f1b4.png