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JSP登錄中Session的用法實例詳解

本文實例講述了jsp登錄中session的用法。分享給大家供大家參考，具體如下：

登錄頁面

<%@ page language="java" contenttype="text/html; charset=utf-8"
  pageencoding="utf-8"%>
<!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<title>insert title here</title>
</head>
<body>
 <div style="float:left;margin-top:100px;margin-left:200px;width:400px;height:300px;background:gray;">
 <form action="indexservlet" method="post">
 <div style="float:left;width:400px;height:30px;background:gray;margin-top:50px">
  <div style="margin-left:70px;float:left;line-height:30px">賬號:</div><input style="disply:block;float:left;width:200px;height:30px;border:none;" type="text" name="user"/>
 </div>
 <div style="float:left;width:400px;height:30px;background:gray;margin-top:50px">
  <div style="margin-left:70px;float:left;line-height:30px">密碼:</div><input style="disply:block;float:left;width:200px;height:30px;border:none;" type="text" name="password"/>
 </div>
 <div style="float:left;margin-top:50px;width:400px;height:30px;background:gray;">
  <input style="float:left;width:60px;height:30px;margin-left:170px;border:none;" type="submit" name="ok" value="登錄"/>
 </div>
 </form>
 </div>
</body>
</html>

檢測賬號密碼以及設置session的indexservlet

import java.io.ioexception;
import javax.servlet.servletexception;
import javax.servlet.annotation.webservlet;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import javax.servlet.http.httpsession;
/**
 * servlet implementation class indexservlet
 */
@webservlet("/indexservlet")
public class indexservlet extends httpservlet {
 private static final long serialversionuid = 1l;
    
  /**
   * @see httpservlet#httpservlet()
   */
  public indexservlet() {
    super();
    // todo auto-generated constructor stub
  }
 
 /**
 * @see httpservlet#doget(httpservletrequest request, httpservletresponse response)
 */
 protected void doget(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {
 // todo auto-generated method stub
 response.getwriter().append("served at: ").append(request.getcontextpath());
 }
 
 /**
 * @see httpservlet#dopost(httpservletrequest request, httpservletresponse response)
 */
 protected void dopost(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {
 // todo auto-generated method stub
 request.setcharacterencoding("utf-8");
 string user = request.getparameter("user");
 string password = request.getparameter("password");
 
 string path = request.getcontextpath();
 httpsession session=request.getsession();
 
 if ("1".equals(user) && "1".equals(password)) {
  
  session.setattribute("name", user);
  response.sendredirect(path + "/success.jsp");
  
 }else{
  response.sendredirect(path + "/index.jsp");
 }
 }
 
}

成功登錄頁面

<%@ page language="java" import="java.util.*" pageencoding="utf-8"%>
<!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd">
<%
 string path = request.getcontextpath();
%>
<%
 object name = session.getattribute("name");
 if(name==null){
 response.sendredirect(path+"/index.jsp");
 }
%>
<html>
 <head>
 <title>成功頁面</title>
 </head>
 <body>
 恭喜你，騷年，<%=session.getattribute("name") %>,成功登陸了！
 <a href="out.jsp" rel="external nofollow" >注銷</a>
 </body>
</html>

注銷功能的jsp

<%@ page language="java" contenttype="text/html; charset=utf-8" pageencoding="utf-8"%>
<!doctype html public "-//w3c//dtd html 4.01 transitional//en" "http://www.w3.org/tr/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<title>insert title here</title>
</head>
<body>
 <% 
 string path = request.getcontextpath();
 %>
 <%
   session.removeattribute("name");
   response.sendredirect(path+"/index.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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