33.Struts-动态访问国际化资源（国家/语言切换）

最新推荐文章于 2019-09-03 22:04:28 发布

转载最新推荐文章于 2019-09-03 22:04:28 发布 · 296 阅读

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#国际化

本文介绍了一种在Struts2框架中实现应用国际化的方法，通过动态设置语言环境，使用户能够在不同语言间自由切换。文章详细展示了如何配置Struts2以支持多语言，并提供了具体的代码示例。

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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:

[html] view plain copy

print ?

<%@ 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”/><!– 设置一个参数 session_locale,参数WW_TRANS_I18N_LOCALE在执行action之前赋，并存于session–>
<s:bean name = “com.action.testI18n” id = “localeList”> <!– javaBean实例，并为其参数locale赋值 –>
<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()” > <!–设置name属性–>
</s:select>
</s:form>
<s:form action = “login.action” method = “post”>
<s:textfield name = “username” key = “loginUser”/> <!–通过key获取国际化资源文件–>
<s:password name = “password” key = “loginPassword”/>
<s:submit key = “loginSubmit”/>
</s:form>
</body>
</html>

<%@ 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"/><!-- 设置一个参数 session_locale,参数WW_TRANS_I18N_LOCALE在执行action之前赋，并存于session-->
    <s:bean name = "com.action.testI18n" id = "localeList">  <!-- javaBean实例，并为其参数locale赋值 -->
      <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()" >  <!--设置name属性-->
      </s:select>    

    </s:form>

   <s:form action = "login.action" method = "post">
        <s:textfield name = "username" key = "loginUser"/> <!--通过key获取国际化资源文件-->
        <s:password name = "password" key = "loginPassword"/>

        <s:submit key = "loginSubmit"/>
   </s:form>

  </body>
</html>

Action:(testI18n.java)

[java] view plain copy

print ?

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;
}
}

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

[html] view plain copy

print ?

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

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

[html] view plain copy

print ?

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

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

Action（LoginAction）

[java] view plain copy

print ?

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;
}
}

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：

[html] view plain copy

print ?

<?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>

<?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：