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纯JSP实现的简单登录示例

2020-07-27 21:27:25
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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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