功能：
点击login , redirect 到hello.jsp 显示 "hello"
点击redirect, redirect 到 error.jsp 显示 "error"
1.创建Struts2 工程
2.web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<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>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
3.index.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ 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>Insert title here</title>
</head>
<body>
<s:a action="login">login</s:a><br/>
<s:a action="login!redirect.action">redirect</s:a> <!--此处有bug-->
</body>
</html>
4.LoginAction.java
package com.action;
import com.opensymphony.xwork2.ActionSupport; public class LoginAction extends ActionSupport {
private static final long serialVersionUID=1L;
public String execute() throws Exception{
return SUCCESS;
}
public String redirect() throws Exception{
return ERROR;
}
}
5.UserAction.java
package com.action;
import com.opensymphony.xwork2.ActionSupport; public class UserAction extends ActionSupport {
private static final long serialVersionUID=1L;
public String execute() throws Exception{
return SUCCESS;
}
}
6.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>
<package name="default" extends="struts-default">
<action name="login" class="com.action.LoginAction">
<result type="redirectAction">
<param name="actionName">userLogin</param>
<param name="namespace">/user</param>
</result>
<result name="error" type="redirectAction">error</result> <!--此处的name为LoginAction.redirect传过来的值ERROR-->
</action>
<action name="error">
<result>/error.jsp</result>
</action>
</package>
<package name="user" extends="struts-default" namespace="/user">
<action name="userLogin" class="com.action.UserAction">
<result>
/hello.jsp
</result>
</action>
</package>
</struts>
7.error.jsp & hello.jsp
<body>
<center>
<h2>error</h2>
</center>
</body> <body>
<center>
<h2>hello</h2>
</center>
</body>