标签：style blog http io color os 使用 java sp
这篇随笔是上一篇的姊妹篇@_@!
服务器创建session出来后，会把 session的id号，以cookie的形式回写给客户机，这样，只要客户机的浏览器不关， 去访问服务器时，都会带着session 的id号去，服务器发现客户机带session id过来了，就会使用内存中与之对应的session为之服务
服务器第一次创建session，程序员把session id号，手工以cookie的形式回送给浏览器，并设置cookie的有效期这样，即使用户的浏览器关了，开新浏览器时，还会带着session id找服务器，服务器从而就可以用内存中与之对应的session为第二个浏览器窗口服务。
应用：关掉IE后，再次打开IE，还能访问上次的session
1 package com.yyz.session; 2 3 import java.io.IOException; 4 5 import javax.servlet.ServletException; 6 import javax.servlet.http.Cookie; 7 import javax.servlet.http.HttpServlet; 8 import javax.servlet.http.HttpServletRequest; 9 import javax.servlet.http.HttpServletResponse; 10 import javax.servlet.http.HttpSession; 11 12 public class SessionDemo1 extends HttpServlet { 13 14 public void doGet(HttpServletRequest request, HttpServletResponse response) 15 throws ServletException, IOException { 16 HttpSession session = request.getSession(); 17 session.setAttribute("data", "abc"); 18 String sessionid = session.getId(); 19 Cookie cookie = new Cookie("JSESSIONID",sessionid); 20 cookie.setMaxAge(3600); 21 cookie.setPath("/test"); 22 response.addCookie(cookie); 23 } 24 25 public void doPost(HttpServletRequest request, HttpServletResponse response) 26 throws ServletException, IOException { 27 doGet(request,response); 28 } 29 30 }
package com.yyz.session; 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 javax.servlet.http.HttpSession; public class SessionDemo2 extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { HttpSession session = request.getSession(); String data = (String)session.getAttribute("data"); System.out .println(data); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request,response); } }
标签：style blog http io color os 使用 java sp
原文地址：http://www.cnblogs.com/yyz666/p/4060240.html
