MyEclipse下的Struts2登录系统

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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

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