session钝化与活化

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创建User实体

package com.oracle.entity;

import java.io.Serializable;

import javax.servlet.http.HttpSessionActivationListener;
import javax.servlet.http.HttpSessionBindingEvent;
import javax.servlet.http.HttpSessionBindingListener;
import javax.servlet.http.HttpSessionEvent;

public class User implements HttpSessionBindingListener,HttpSessionActivationListener,Serializable{

private String name;
private String pwd;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}

public User(String name, String pwd) {
super();
this.name = name;
this.pwd = pwd;
}
public User() {
super();
// TODO Auto-generated constructor stub
}
/**
* Session绑定和解绑的方法
*/
public void sessionDidActivate(HttpSessionEvent arg0) {
// 活化
System.out.println("Sesion活化，"+arg0.getSource());
}
public void sessionWillPassivate(HttpSessionEvent arg0) {
// 钝化
System.out.println("Sesion钝化，"+arg0.getSource());
}

/**
* Session绑定和解绑的方法
*/
public void valueBound(HttpSessionBindingEvent arg0) {
// 绑定
System.out.println("Session绑定,"+arg0.getName());
}
public void valueUnbound(HttpSessionBindingEvent arg0) {
// 解绑
System.out.println("Session解绑,"+arg0.getName());
}

}

Servlet类

package com.oracle.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.oracle.entity.User;

public class Login extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

doPost(request,response);
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

String name = request.getParameter("name");
String pwd = request.getParameter("pwd");

//把登录用户的对象存到session
request.getSession().setAttribute("user", new User(name,pwd));

response.sendRedirect("index.jsp");
}

}

web.xml代码

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
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_2_5.xsd">
<display-name></display-name>
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>Login</servlet-name>
<servlet-class>com.oracle.servlet.Login</servlet-class>
</servlet>


<filter-mapping>
<filter-name>Login</filter-name>
<url-pattern>/Login</url-pattern>
</filter-mapping>


<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>

jsp代码

index.jsp

<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'index.jsp' starting page</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">

</head>

<body>
当前登录用户：${sesionScope.user.name }
</body>
</html>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'login.jsp' starting page</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">


</head>

<body>
<form action="Login" method="post">
用户名：<input type="text" name="name"><br>
密码：<input type="password" name="pwd"><br>
<input type="submit" value="登录">
</form>
</body>
</html>

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