在servlet中创建和应用session

在servlet中创建和应用session

创建设置session

import javax.servlet.http.*;
import javax.servlet.*;
import java.io.*;

public class setSession extends HttpServlet{

public  void doGet(HttpServletRequest request,
                     HttpServletResponse response)
throws ServletException,
                      IOException{
           HttpSession session=request.getSession();
//返回与当前request相关联的session，如果没有则在服务器端创建一个;
           session.setAttribute("username","zhangjie");

    response.getWriter().println("------setSession() is ok--------");
          }
}

获取servlet

import javax.servlet.http.*;
import javax.servlet.*;
import java.io.*;

public class getSession extends HttpServlet{

public  void doGet(HttpServletRequest request,
                     HttpServletResponse response)
throws ServletException,
                      IOException{
           HttpSession session=request.getSession();
//返回与当前request相关联的session，如果没有则在服务器端创建一个;
           response.getWriter().println(session.getAttribute("username"));

 resp.getWriter().println("------getSession() is ok--------");
          }
}

session

jstl 获取session：${sessionScope.key}

jsp后台获取session：
String username = (String)request.getSession().getAttribute(“username”);