Session的学习

由上一篇文章我们已经知道session的概念，接下来一个图解释session的工作原理

一、创建Session

package test;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 SetSession*/
@WebServlet("/SetSession")
public class SetSession extends HttpServlet {private static final long serialVersionUID = 1L;/*** @see HttpServlet#HttpServlet()*/public SetSession() {super();// TODO Auto-generated constructor stub}/*** @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {HttpSession session=request.getSession();session.setAttribute("username","lsa");session.setAttribute("sex","gril" );}/*** @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubdoGet(request, response);}}

二、得到session

 

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//创建或者设置sessionHttpSession session=request.getSession();String name=(String) session.getAttribute("username");String sex=(String) session.getAttribute("sex");System.out.println(name);System.out.println(sex);//删除sessionsession.removeAttribute("username");String name1=(String) session.getAttribute("username");String sex1=(String) session.getAttribute("sex");System.out.println(name1);System.out.println(sex1);//删除session//session.removeAttribute("username");//销毁session//session.invalidate();}