Java_session基础

 

 

package com.xxxx.session01;

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("/s01")
public class Session01 extends HttpServlet {
    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//       获取session对象
        HttpSession session = request.getSession();
//        获取session的会话标识符
        String ID = session.getId();
        System.out.println(ID);
//        获取session的创建时间
        System.out.println(session.getCreationTime());
//        获取session 的最后访问时间
        System.out.println(session.getLastAccessedTime());
//        判断是否是新的session对象
        System.out.println(session.isNew());
    }
}

 

 

package com.xxxx.session01;

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("/s02")
public class Session02 extends HttpServlet {
    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//          获取session对象
        HttpSession session = request.getSession();
//          设置session域对象
        session.setAttribute("uname","admin");
        session.setAttribute("upwd","123456");
//          移除session域对象
        session.removeAttribute("upwd");

//        request域对象
        request.setAttribute("name","zhangsan");
//        跳转index.jsp中
        request.getRequestDispatcher("index.jsp").forward(request, response);



    }
}

 

 

package com.xxxx.session01;

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("/s03")
public class Session03 extends HttpServlet {
    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//          获取session对象
        HttpSession session = request.getSession();
//          设置session域对象
        session.setAttribute("uname","admin");
//
        System.out.println("session的最大不活动时间："+ session.getMaxInactiveInterval());
//修改最大不活动时间
        session.setMaxInactiveInterval(5);//5秒失效

//       session.invalidate();//立即销毁

//关闭浏览器session失效
//        关闭服务器session失效



    }
}