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session会对每一个用户（浏览器）创建一个session对象

@Override    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
           doPost(req, resp);    }    @Override    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
           req.setCharacterEncoding("utf-8");        resp.setCharacterEncoding("utf-8");        resp.setContentType("text/html;charset=utf-8");        //得到一个session        HttpSession session = req.getSession();        //给session中存东西        session.setAttribute("name","徐源");        //获取session的ID        String id = session.getId();        //判读是否是新的        if (session.isNew()){
               resp.getWriter().write("session创建成功,id为:"+id);        }else {
               resp.getWriter().write("session已经创建,id为:"+id);        }

           
    
     sessionDemo
            
    
     com.xuyuan.demo.sessionDemo
        
       
           
    
     sessionDemo
            
    
     /session
        
   

servletdemo2：

package com.xuyuan.demo;import com.xuyuan.demo.pojo.Person;import javax.servlet.ServletException;import javax.servlet.ServletInputStream;import javax.servlet.ServletOutputStream;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;public class sessionDemo2 extends HttpServlet {
       @Override    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
           doPost(req, resp);    }    @Override    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
           req.setCharacterEncoding("utf-8");        resp.setCharacterEncoding("utf-8");        resp.setContentType("text/html;charset=utf-8");        //得到一个session        HttpSession session = req.getSession();        //给session中存东西        Person person = (Person) session.getAttribute("name");        System.out.println(person.toString());    }}

实体类

package com.xuyuan.demo.pojo;public class Person {
       private String name;    private int age;    public Person(String name, int age) {
           this.name = name;        this.age = age;    }    public void setName(String name) {
           this.name = name;    }    public String getName() {
           return name;    }    public int getAge() {
           return age;    }    @Override    public String toString() {
           return "Person{" +                "name='" + name + '\'' +                ", age=" + age +                '}';    }    public void setAge(int age) {
           this.age = age;    }}

注销session

package com.xuyuan.demo;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import java.io.IOException;public class sessionDemo03 extends HttpServlet {
       @Override    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
          doPost(req, resp);    }    @Override    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
           HttpSession session = req.getSession();        session.removeAttribute("name");        session.invalidate();//注销    }}

一个浏览器对应一个session对象

    
   
                
    
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