本文实例讲述了纯JSP实现的简单登录的方法。分享给大家供大家参考，具体如下：
文件共有四个web.xml、login.jsp、logout.jsp、welcome.jsp四个文件
测试环境：Tomcat 6.0.x
假设项目名称是LoginSample，我的目录结构是这样的
.../webapps/LoginSample/WEB-INF/web.xml
.../webapps/LoginSample/login.jsp
.../webapps/LoginSample/logout.jsp
.../webapps/LoginSample/welcome.jsp
web.xml源码清单：
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"version="2.4"> <welcome-file-list> <welcome-file>welcome.jsp</welcome-file> </welcome-file-list></web-app>
login.jsp源码清单：
<%@ page contentType="text/html;charset=UTF-8" %><html> <head> <title>JSP简单登录实例</title> </head> <body> <h2>请登录</h2> <form method="POST" > Login Name: <input type="text" name="Name"><br> Login Password: <input type="text" name="Password" ><br> <input type="submit" value="Send"><br> <form> <% if (request.getParameter("Name") != null && request.getParameter("Password") != null) { String Name = request.getParameter("Name"); String Password = request.getParameter("Password"); if (Name.equals("a") && Password.equals("a")) { session.setAttribute("Login", "OK"); session.setAttribute("myCount", new Integer(1)); response.sendRedirect("welcome.jsp"); } else { %> 登录失败:用户名或密码不正确～ <% } }%> </body></html>
logout.jsp源码清单：
<%@ page contentType="text/html;charset=UTF-8" %><html> <% session.setAttribute("Login", ""); %> <body> <h2>你已经退出登录</h2> </body></html>welcome.jsp源码清单：
<%@ page contentType="text/html" pageEncoding="UTF-8" import="java.util.*"%><html> <body> <h2>欢迎页面(测试session)</h2> <% String Login = (String)session.getAttribute("Login"); int nCount=0; if (Login != null && Login.equals("OK")) { Integer myCount = (Integer)session.getAttribute("myCount"); if(myCount!=null) { nCount = myCount.intValue(); nCount = nCount + 1; session.setAttribute("myCount",new Integer(nCount)); } %> 登录成功,myCount=<%=nCount%></br> <input type=button value="退出" onclick="javascript:location.href='logout.jsp'"> <% } else {%> <jsp:forward page="login.jsp"/><% } %> </body></html>希望本文所述对大家JSP程序设计有所帮助。
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