Session使用细节
Session钝化、活化
Session销毁：
Session介绍
=========
服务端会话跟踪技术：将数据保存到服务端
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JavaEE提供HttpSession接口，来实现一次会话的多次请求间数据共享功能
使用：
1、获取Session对象
HttpSession session=request.getSession();
2、Session对象功能
void setAttribute(String name,Object o);//存储数据到session域中
Object getAttribute(String name);//根据key获取value值
void removeAttribute(String name);//根据key，删除键值对
创建两个类SessionServlet和SessionServlet1
package com;
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 SessionServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//存储到session中
//1、获取session对象
HttpSession session=req.getSession();
//存储数据
session.setAttribute(“username”,“root”);
}
}
public class SessionServlet1 extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//获取数据。从session中
//1获取session对象
HttpSession session=req.getSession();
//获取数据
Object username=session.getAttribute(“username”);
System.out.println(“获取到的session值为”+username);
}
web.xml配置两个类的访问地址
SessionServlet1
com.SessionServlet1
SessionServlet1
/sessionServlet1
SessionServlet
com.SessionServlet
