MyEclipse下的Struts2登录系统

目录结构如下

首先导入Struts 2 core Libraries包，右击项目选址myeclipse选项的add Struts2即可

1.代码：Login下的LoginAction.java

package Login;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport {
	private String userName;
	private String password;
	private String mess = ERROR;
	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 void validate(){
		if(this.getUserName()==null || this.getUserName().length()==0){
			addFieldError("userName", "用户名不能为空");
		}
		if(this.getPassword()==null || this.getPassword().length()==0){
				addFieldError("password", "密码不能为空");
		}else{
				mess=SUCCESS;
			}
		}
	
	public String execute(){
			return mess;
	}
	
}

2.struts.xml代码

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
	<package name="login" extends="struts-default">
		<action name="login" class="Login.LoginAction">
			<result name="success">/success.jsp</result>
			<result name="error">/login.jsp</result>
			<result name="input">/login.jsp</result>
		</action>
	</package>
</struts>    

3.web.xml代码：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 
	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_3_0.xsd">
  <display-name></display-name>	
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  <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></web-app>

4.login.jsp代码：

<%@ page language="java" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>


<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>基于Struts2的登录系统</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">
	<!-- 
	<link rel="stylesheet" type="text/css" href="ExtJs/resources/css/ext-all.css" />
  	<script type="text/javascript" src="ExtJs/adapter/ext/ext-base.js"></script>
  	<script type="text/javascript" src="ExtJs/ext-all.js"></script>
	 -->
	
  </head>
  
  <body>
  	<center>
  	<s:form action="login" method="post">
    	<table border="1" align="center" bgcolor="#AABBCCDD">
  			<tr><td><s:textfield name="userName" label="用户名字" size="18"/></td></tr>
  			<tr><td><s:password name="password" label="用户密码" size="18"/></td></tr>
  			<tr><td><s:submit value="登录"/></td></tr>
  		</table>
  	</s:form>
  	</center>
  </body>
</html>

5.登录成功界面：success.jsp

<%@ page language="java" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>


<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>登录成功</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">
	<!-- 
	<link rel="stylesheet" type="text/css" href="ExtJs/resources/css/ext-all.css" />
  	<script type="text/javascript" src="ExtJs/adapter/ext/ext-base.js"></script>
  	<script type="text/javascript" src="ExtJs/ext-all.js"></script>
	 -->
	
  </head>
  
  <body>
    	${userName }登录成功！
  </body>
</html>

运行流程如下：

首先获得login.jsp的请求，在web.xml中被拦截，到struts.xml中找到需要执行的action：login，执行类LoginAction.java，返回mess信息，struts.xml中的result会根据返回的信息执行下一步操作，如果成功则跳转到success.jsp，失败则返回login.jsp页面中