本文實例講述了純JSP實現的簡單登錄的方法。分享給大家供大家參考，具體如下：
文件共有四個web.xml、login.jsp、logout.jsp、welcome.jsp四個文件
測試環境：Tomcat 6.0.x
假設項目名稱是LoginSample，我的目錄結構是這樣的
.../webapps/LoginSample/WEB-INF/web.xml
.../webapps/LoginSample/login.jsp
.../webapps/LoginSample/logout.jsp
.../webapps/LoginSample/welcome.jsp
web.xml源碼清單：
<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源碼清單：
<%@ page contentType="text/html;charset=UTF-8" %><html> <head> <title>JSP簡單登錄實例</title> </head> <body> <h2>請登錄</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 { %> 登錄失敗:用戶名或密碼不正確～ <% } }%> </body></html>logout.jsp源碼清單：
<%@ page contentType="text/html;charset=UTF-8" %><html> <% session.setAttribute("Login", ""); %> <body> <h2>你已經退出登錄</h2> </body></html>welcome.jsp源碼清單：
<%@ page contentType="text/html" pageEncoding="UTF-8" import="java.util.*"%><html> <body> <h2>歡迎頁面(測試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)); } %> 登錄成功,myCount=<%=nCount%></br> <input type=button value="退出" onclick="javascript:location.href='logout.jsp'"> <% } else {%> <jsp:forward page="login.jsp"/><% } %> </body></html>希望本文所述對大家JSP程序設計有所幫助。
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