Struts2---->I18N

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一、国际化原理

首先指定全局的国际化资源文件:在配置文件struts.xml中引入

<constant name="struts.custom.i18n.resources" value="app"></constant>

或在src下面新建struts.properties文件中指定如下一行:struts.custom.i18n.resources=app
指定的国家化资源文件即为 xxx_语言_国家.properties,如上例为app_en_US.properties app_zh_CN.properties
里面的内容分别为

welcome.msg=hello,sirwelcome.msg=\u6B22\u8FCE\u4F60\uFF01

ResourceBundle rs=ResourceBundle.getBundle("app",Locale.CHINA);ResourceBundle rs=ResourceBundle.getBundle("app",Locale.US);String welcome=rs.getString("welcome.msg");

二、struts2的国际化

Struts2的国际化分三种情况：前台页面的国际化，Action类中的国际化，配置文件的国际化。
2.1前台页面的国际化

JSP页面上的国际化(使用struts2的<s:text .../>):

<s:i18n name="app">   <s:text name="hello">     <s:param>${username}</s:param>   </s:text> </s:i18n>

表单元素的Label国际化,使用key:，值为properties文件中的key标签中key大多是和国际化相关的

<s:textfield name="username" key="name"></s:textfield><s:textfield name="password" key="password"></s:textfield>

2.2Action中的国际化

String message=getText("password.error");this.addFieldError("password", message);

(3)配置文件的国际化

Struts2基于XML配置方式实现对Action方法进行校验，并对校验信息国际化。参照http://blog.csdn.net/furongkang/article/details/6922046

三、动态语言切换

传递一个参数request_locale即可

<s:url id="url" action="lang"><s:param name="request_locale">en_US</s:param></s:url><s:a href="%{url}" key="english"><s:text name="english" /></s:a><s:url id="url1" action="lang"><s:param name="request_locale">ch_CN</s:param></s:url><s:a href="%{url1}"><s:text name="chinese" /></s:a><a href="lang?request_locale=en_US"><s:text name="english"></s:text></a><a href="lang?request_locale=ch_CN"><s:text name="chinese"></s:text>

Struts.xml配置action为lang时候跳到自身

<action name="lang"><result>/add.jsp</result></action>

四、国际化资源文件的分类

当应用程序很大时，需要国际化的东西会很多，因此需要将国际化资源文件进行分类。在src中的properties文件是全局资源文件，另外还可以分为包级别的和类级别的

4.1全局资源文件

在src中的properties文件是全局资源文件

4.1包级别

命名规则为package_language_country.properties 如package_en_US.properties

4.2类级别

如RegisterAction_en_US.properties

国际化资源文件的优先级

全局<包级别<类级别

另外要进行表单的国际化时，要去掉theme="simple"

例子：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><% String path = request.getContextPath(); String basePath = request.getScheme() + "://"   + request.getServerName() + ":" + request.getServerPort()   + path + "/";%><%@taglib uri="/struts-tags" prefix="s"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head>  <base href="<%=basePath%>">  <title>My JSP 'index.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"> </head> <body> <s:fielderror/>  <s:form id="login" action="user!login">   <s:text name="name" />   <input name="name" />   <br />   <s:text name="password" />   <input name="password" type="password" />   <br />   <s:submit key="login">   </s:submit>  </s:form>  <s:url id="url" action="lang">   <s:param name="request_locale">en_US</s:param>  </s:url>  <s:a href="%{url}" key="english">   <s:text name="english" />  </s:a>  <s:url id="url1" action="lang">   <s:param name="request_locale">ch_CN</s:param>  </s:url>  <s:a href="%{url1}">   <s:text name="chinese" />  </s:a>   <a href="lang?request_locale=en_US"><s:text name="english"></s:text>  </a>  <a href="lang?request_locale=ch_CN"><s:text name="chinese"></s:text>  </a> </body></html>

login_success.jsp

package com.ncepu.struts2;import com.opensymphony.xwork2.ActionSupport;public class LoginAction extends ActionSupport { private static final long serialVersionUID = 1L; private String name; private String password;   public String getName() {  return name; } public void setName(String name) {  this.name = name; } public String getPassword() {  return password; } public void setPassword(String password) {  this.password = password; } public String login() {  if ("".equals(name)) {   String message=getText("username.error");   this.addFieldError("name", message);   return "error";  }  if ("".equals(password)) {   String message=getText("password.error");   this.addFieldError("password", message);   return "error";  }  System.out.println("name=" + name + "password=" + password);  return ("success"); }}

LoginAction.java

package com.ncepu.struts2;import com.opensymphony.xwork2.ActionSupport;public class LoginAction extends ActionSupport {private static final long serialVersionUID = 1L;private String name;private String password; public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String login() {if ("".equals(name)) {String message=getText("username.error");this.addFieldError("name", message);return "error";}if ("".equals(password)) {String message=getText("password.error");this.addFieldError("password", message);return "error";}System.out.println("name=" + name + "password=" + password);return ("success");}}

struts.xml

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"    "http://struts.apache.org/dtds/struts-2.0.dtd"><struts><constant name="struts.devMode" value="true" /><constant name="struts.custom.i18n.resources" value="message"></constant><package name="default" namespace="/" extends="struts-default"><action name="user" class="com.ncepu.struts2.LoginAction"><result name="success">/login_success.jsp            </result><result name="error">/login.jsp            </result></action><action name="lang"><result>/login.jsp</result></action></package></struts>

web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app id="WebApp_9" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">    <display-name>Struts Blank</display-name>    <filter>        <filter-name>struts2</filter-name>        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>    </filter>    <filter-mapping>        <filter-name>struts2</filter-name>        <url-pattern>/*</url-pattern>    </filter-mapping>    <welcome-file-list>        <welcome-file>login.jsp</welcome-file>    </welcome-file-list></web-app>

message_en_US.properties

name=usernamepassword=passwordlogin=loginusername.error = the username error !password.error = the password error!chinese=chineseenglish=englishname.empty = the username should not be empty \!  name.size = the size of username should be between 6 and 12 \! login.success=login success\!

message_zh_CN.properties

name=\u7528\u6237\u540Dpassword=\u5BC6\u7801login=\u767B\u9646username.error = \u7528\u6237\u540D\u9519\u8BEFpassword.error = \u5BC6\u7801\u9519\u8BEFenglish=\u82F1\u8BEDchinese=\u4E2D\u6587name.empty=\u7528\u6237\u540D\u4E0D\u80FD\u4E3A\u7A7Aname.size=\u7528\u6237\u540D\u5FC5\u987B\u4E3A6-12\u4F4Dlogin.success=\u767B\u9646\u6210\u529F

ps: jsp页面少了<%@taglib uri="/struts-tags" prefix="s"%>，会导致国际化显示错误。

文章： http://www.blogjava.net/toby/archive/2009/03/19/260918.html

http://www.cnblogs.com/langlang/archive/2010/01/14/1647627.html

http://blog.csdn.net/furongkang/article/details/6922046