思路：
1.在struts.xml中配置好默認的語言：
<constant name="sturts.locale" value="zh_CN" />
2.在jsp頁面中，設置一些鏈接(<a></a>)，這些鏈接是Action類，然後通過這些鏈接，在Action中設置好相應的參數, 並將它保存在application對象中。
3.在跳轉後的jsp頁面中，通過獲取application對象的相應的屬性的值，以後在相應的表單中通過設置隱藏屬性<input type="hidden" name="request_locale" value="<%= (String)application.getAttribute("language") />，這樣子在以後的跳轉頁面都會顯示相應的語言了。
4.具體的代碼如下：
<?xml version="1.0" encoding="UTF-8" ?>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Login</title>
</head>
<body>
<%
String lang = (String)application.getAttribute("lang");
if (lang == null)
{
lang = "zh_CN";
}
session.setAttribute("language", lang);
%>
<table align="center" border="1">
<caption>Login</caption>
<s:form method="post" name="loginForm" action="Login" namespace="/" validate="false">
<tr>
<td>
<s:text name="label_user"></s:text>
</td>
<td>
<s:textfield name="userName" size="20"></s:textfield>
</td>
</tr>
<tr>
<td>
<s:text name="label_password"></s:text>
</td>
<td>
<s:textfield name="passWord" size="20"></s:textfield>
</td>
</tr>
<input type="hidden" name="request_locale" value="<%=(String)session.getAttribute("language")%>"/>
<tr>
<td colspan="2" align="center">
<s:submit type="input" key="label_submit"></s:submit>
<s:reset type="password" key="label_reset"></s:reset>
</td>
</tr>
<tr>
<td colspan="2">
<s:fielderror>
</s:fielderror>
</td>
</tr>
</s:form>
</table>
<!-- 這裡是進行設置語言選擇的 -->
<s:url id="zhongwen" action="ChangeLang.action">
<s:param name="language">zh_CN</s:param>
</s:url>
<s:a href="%{zhongwen}">中文</s:a>
<s:url id="english" action="ChangeLang.action">
<s:param name="language">en_US</s:param>
</s:url>
<s:a href="%{english}">英文</s:a>
</body>
</html>
//User Model
package yang.www;
public class UserBean
{
private String userName;
private String passWord;
public UserBean(){}
public String getUserName() {
return userName;
}
public String getPassWord() {
return passWord;
}
public void setUserName(String userName) {
this.userName = userName;
}
public void setPassWord(String passWord) {
this.passWord = passWord;
}
}
//進行語言的設置：
package yang.www;
import java.util.Locale;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class ChangeLang extends ActionSupport
{
/**
*
*/
private static final long serialVersionUID = 1L;
private String language;
public String getLanguage() {
return language;
}
public void setLanguage(String language) {
this.language = language;
}
public String execute()
{
String[] strings = this.getLanguage().split("_");
Locale locale = new Locale(strings[0], strings[1]);
ServletActionContext.getContext().setLocale(locale);
ActionContext.getContext().getApplication().put("lang", this.getLanguage());
return SUCCESS;
}
}
//Login Action
package yang.www;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
public class Login extends ActionSupport implements ModelDriven<UserBean>
{
/**
*
*/
private static final long serialVersionUID = 1L;
private UserBean user = new UserBean();
@Override
public UserBean getModel() {
// TODO Auto-generated method stub
return user;
}
ActionContext context = ActionContext.getContext();
public String execute()
{
boolean rightUser = "yangzhiyong".equals( this.getModel().getUserName() );
boolean rightPassWord = "yangzhiyong".equals(this.getModel().getPassWord());
if ( rightUser && rightPassWord )
{
context.getSession().put("username", this.getModel().getUserName());
return SUCCESS;
}
else
{
return ERROR;
}
}
public void validate()
{
if (this.getModel().getUserName().length() < 6 )
{
this.addFieldError("userName", this.getText("label_userError"));
}
if (this.getModel().getPassWord().length() < 5)
{
this.addFieldError("passWord", this.getText("label_passwordError"));
}
}
}
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.locale" value="zh_CN" />
<constant name="struts.custom.i18n.resources" value="i18n/myMessage" />
<constant name="struts.ui.theme" value="simple" />
<constant name="struts.ui.templateDir" value="template" />
<constant name="struts.ui.templateSuffix" value="ftl" />
<package name="hello" extends="struts-default" namespace="/">
<action name="Login" class="yang.www.Login">
<result name="success">/jsp/welcome.jsp</result>
<result name="error">/jsp/error.jsp</result>
<result name="input">/index.jsp</result>
</action>
<action name="ChangeLang" class="yang.www.ChangeLang" >
<result name="success">/index.jsp</result>
</action>
</package>
<!-- Add packages here -->
</struts>
//error.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Login Error</title>
</head>
<body>
<h1>Sorry login failed!</h1>
</body>
</html>
//welcome.jsp
<?xml version="1.0" encoding="UTF-8" ?>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Login Success!</title>
</head>
<body>
<s:property value="#session.username"/>
<h3>Welcome , you login successfully !</h3>
<s:text name="welcome"></s:text>
</body>
</html>
完整可運行的例子，可以到我的資源裡下載。這樣子可能會更加理解一點。