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本文链接：https://blog.youkuaiyun.com/iteye_20054/article/details/81991807

本文介绍了一个使用Struts2框架实现的简单登录系统案例。包括了login.jsp用于输入用户名和密码，LoginAction.java作为业务处理类验证用户信息，以及通过struts.xml配置文件定义流程。演示了dispatcher和redirect两种跳转方式的区别。

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===========================================  
login.jsp  
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=gb2312">
<meta http-equiv="Cache-Control" content="no-cache">
<meta http-equiv="Pragma" content="no-cache">
<title></title>
</head>
  <body>
  <form action="LoginAction.action" method="post">><!--默认是get-->

    name<input type="text" name=username /><!--username后面有空格-->
    password<input type="password" name=password />
    <input type="submit"/>
    <input type="reset"/>
    </form>
  </body>
</html>
===========================================  
web.xml(路径在web-inf下)  
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
	xmlns="http://java.sun.com/xml/ns/javaee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  <filter>
  <filter-name>struts2</filter-name>
  <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
  </filter>
  <filter-mapping>
  <filter-name>struts2</filter-name>
  <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>
===========================================  
struts.xml（路径在web-inf\classes下)  
<?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="struts" extends="struts-default">
<action name="LoginAction" class="com.zyl.action.LoginAction">
<result name="success" type="dispatcher">/success.jsp</result>
<result name="login" type="redirect">/login.html</result>
</action>
</package>
</struts>
<!--	1.跳转方式 
dispatcher和chain是服务器端跳转，所以客户端只发起一次请求，产生一个action；
		redirect和redirectAction是客户端跳转，所以客户端发起两次请求。
 2.跳转内容
		dispatcher和redirect跳转的是views（一般是jsp页面）；
		chain和redirectAction跳转的是一个action。-->
===========================================  
LoginAction.java  
package com.zyl.action;


public class LoginAction {
	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(){
		if("zyl".equals(username)&&"123".equals(password)){
			return "success";
		}else{
			return "login";
		}

	}
}
===========================================  
success.jsp
<%@page contentType="text/html;charset=gb2312" pageEncoding="gb2312"%>
<%@ taglib uri="/struts-tags" prefix="s"%><!-=这里是s不是p-->

<s:property value="username"/><!--这里是value 不是name-->

<%out.println("成功");%>