利用JsessionID实现两端的持久通信

利用JsessionID实现两端的持久通信

当客户ServeC第一次访问第一次访问服务ServeB时是没有JsessionID的；但ServeB中的HttpServlet会生成一个JsessionID给到ServeC；下次访问时ServeB就可以通过获取ServeC的JsessionID查看他的信息在如下中打印出来

package com.mab.Session;

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;
import java.io.IOException;
@WebServlet(urlPatterns = "/ServeC")
public class ServeC extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //调用getSession方法通过setAttribute往httpSession中传入数据
        HttpSession httpSession = req.getSession();
        httpSession.setAttribute("name", "bing");
        httpSession.setAttribute("pwd", "123");
        httpSession.setAttribute("level", "A");

    }
}

package com.mab.Session;

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;
import java.io.IOException;

@WebServlet(urlPatterns = "/ServeB")
public class ServeB extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //调用getSession方法通过getAttribute获取值
        HttpSession session = req.getSession();
        String name = (String) session.getAttribute("name");
        String pwd = (String) session.getAttribute("pwd");
        String level = (String) session.getAttribute("level");
        System.out.println(name);
        System.out.println(pwd);
        System.out.println(level);
    }
}