HttpSessionActivationListener下的对序列化接口的钝化和活化

sessionWillPassivate钝化是指将Serializable接口经常文件存储到磁盘

sessionDidActivate活化是指将生成的文件读取到session域中进行使用，

说明：原本session可以保护用户7天的免密登录；然后钝化使得服务器重启也能保存用户数据

 package com.msb;
 
import org.apache.jasper.tagplugins.jstl.core.Out;
//从地址栏读取数据给到user，然后设置到session域中进行保留
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;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Writer;
@WebServlet(urlPatterns = "/Servlet.do")
public class Servlet extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        HttpSession session = req.getSession();
        String username = req.getParameter("username");
        String password = req.getParameter("password");
        User user = new User(username,password);
        //这里一定一定是session
        session.setAttribute("user",user);
        //这里listener只是为了调用钝化活化hascode，做显示使用
        session.setAttribute("listener",new MySessionActivationListener());
    }
}

 package com.msb;
//实体类user
import java.io.Serializable;
 
public class User implements Serializable {
    private String username;
    private String password;
 
    public User() {
    }
 
    @Override
    public String toString() {
        return "User{" +
                "username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
 
    public String getUsername() {
        return username;
    }
 
    public void setUsername(String username) {
        this.username = username;
    }
 
    public String getPassword() {
        return password;
    }
 
    public void setPassword(String password) {
        this.password = password;
    }
 
    public User(String username, String password) {
        this.username = username;
        this.password = password;
    }
}

 package com.msb;
//钝化读取
import javax.servlet.http.HttpSessionActivationListener;
import javax.servlet.http.HttpSessionEvent;
import java.io.Serializable;
 
public class MySessionActivationListener implements HttpSessionActivationListener , Serializable {
    public void sessionWillPassivate(HttpSessionEvent se) {
        //钝化将Serializable存入磁盘
        System.out.println(se.getSession().hashCode()+"已经钝化");
 
    }
 
    public void sessionDidActivate(HttpSessionEvent se) {
        //活化读取Serializable
        System.out.println(se.getSession().hashCode()+"已经活化");
    }
}

 package com.msb;
 
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;
import java.io.IOException;
@WebServlet(urlPatterns = "/userChicker.do")
public class UserChicker extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //获取user
        HttpSession session = req.getSession();
        //对前面放入session的数据进行读取
        Object attribute = session.getAttribute("user");
        //listener后面钝化活化监听器使用
        Object listener = session.getAttribute("listener");
        String message ="";
        //判断是否第一次登录，此用户
        if(null != attribute){
            message="您已经登录过";
        }else{
            message="您还未登录";
        }
        resp.setCharacterEncoding("UTF-8");
        resp.setContentType("text/html;charset=UTF-8");
        resp.getWriter().println(message);
    }
}

 <%--
  Created by IntelliJ IDEA.
  User: tomel
  Date: 2022/5/30
  Time: 10:14
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<form action="Servlet.do" method="post">
    账号：<input name="username" type="text"><br/>
    密码：<input name="password" type="password"><br/>
    <input value="提交" type="submit">
</form>
</body>
</html>

钝化创建（无格式）文件Context.xml：这里将钝化文件创建到d盘

 <?xml version="1.0" encoding="UTF-8"?>
 
<Context>
 
    <Manager className="org.apache.catalina.session.PersistentManager">
 
        <Store className="org.apache.catalina.session.FileStore" directory="d:/session"/>
 
    </Manager>
 
</Context>

posted @ 2022-05-30 11:51 爱豆技术部阅读(41) 评论(0) 编辑收藏举报

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相关博文：

· 通过Session实现用户登录功能

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· Listener之HttpSessionActivationListener接口

· Listener之session的钝化和活化

· Session 的钝化与活化

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HttpSessionActivationListener下的对序列化接口的钝化和活化

HttpSessionActivationListener下的对序列化接口的钝化和活化

sessionWillPassivate钝化是指将Serializable接口经常文件存储到磁盘

sessionDidActivate活化是指将生成的文件读取到session域中进行使用，

说明：原本session可以保护用户7天的免密登录；然后钝化使得服务器重启也能保存用户数据

钝化创建（无格式）文件Context.xml：这里将钝化文件创建到d盘

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	package com.msb;

	import org.apache.jasper.tagplugins.jstl.core.Out;
	//从地址栏读取数据给到user，然后设置到session域中进行保留
	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;
	import java.io.IOException;
	import java.io.PrintWriter;
	import java.io.Writer;
	@WebServlet(urlPatterns = "/Servlet.do")
	public class Servlet extends HttpServlet {
	@Override
	protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
	HttpSession session = req.getSession();
	String username = req.getParameter("username");
	String password = req.getParameter("password");
	User user = new User(username,password);
	//这里一定一定是session
	session.setAttribute("user",user);
	//这里listener只是为了调用钝化活化hascode，做显示使用
	session.setAttribute("listener",new MySessionActivationListener());
	}
	}

	package com.msb;
	//实体类user
	import java.io.Serializable;

	public class User implements Serializable {
	private String username;
	private String password;

	public User() {
	}

	@Override
	public String toString() {
	return "User{" +
	"username='" + username + '\'' +
	", password='" + password + '\'' +
	'}';
	}

	public String getUsername() {
	return username;
	}

	public void setUsername(String username) {
	this.username = username;
	}

	public String getPassword() {
	return password;
	}

	public void setPassword(String password) {
	this.password = password;
	}

	public User(String username, String password) {
	this.username = username;
	this.password = password;
	}
	}

	package com.msb;
	//钝化读取
	import javax.servlet.http.HttpSessionActivationListener;
	import javax.servlet.http.HttpSessionEvent;
	import java.io.Serializable;

	public class MySessionActivationListener implements HttpSessionActivationListener , Serializable {
	public void sessionWillPassivate(HttpSessionEvent se) {
	//钝化将Serializable存入磁盘
	System.out.println(se.getSession().hashCode()+"已经钝化");

	}

	public void sessionDidActivate(HttpSessionEvent se) {
	//活化读取Serializable
	System.out.println(se.getSession().hashCode()+"已经活化");
	}
	}

	<%--
	Created by IntelliJ IDEA.
	User: tomel
	Date: 2022/5/30
	Time: 10:14
	To change this template use File \| Settings \| File Templates.
	--%>
	<%@ page contentType="text/html;charset=UTF-8" language="java" %>
	<html>
	<head>
	<title>Title</title>
	</head>
	<body>
	<form action="Servlet.do" method="post">
	账号：<input name="username" type="text"><br/>
	密码：<input name="password" type="password"><br/>
	<input value="提交" type="submit">
	</form>
	</body>
	</html>

	<?xml version="1.0" encoding="UTF-8"?>

	<Context>

	<Manager className="org.apache.catalina.session.PersistentManager">

	<Store className="org.apache.catalina.session.FileStore" directory="d:/session"/>

	</Manager>

	</Context>