Servlet和jsp中跨应用的Session怎么取？

跨应用的Session

注意跨应用的Session是取不出来的。我的应用是ServletHello，第二个应用名字叫CookieTest，你可以观察到QueryCookie这个Servlet已经运行了，但就是Session取不出来。可以考虑用文件、数据库，URL传值、隐藏表单传递session id等。初学者不必关心。

package com;

import javax.servlet.*;

import javax.servlet.http.*;

import java.io.IOException;

public class ServletHello2 extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

HttpSession hs=request.getSession();

hs.setAttribute("isLogin", "true");

response.sendRedirect("http://localhost:8080/CookieTest/QueryCookie");

}

}

package com;

import java.io.IOException;

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 QueryCookie extends HttpServlet {

protected void doGet(HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException {

HttpSession hs=request.getSession();

System.out.println("isLogin in Cookie Test Project is "+ hs.getAttribute("isLogin"));

}

}

更多请看：https://blog.csdn.net/qq_44638460/article/details/104231892