java - Springboot SessionListener 函数(sessionCreated()、sessionDestroyed())未调用

Question

我目前正在开发一个 springboot 项目，我想在创建/销毁 session 时执行某些命令。我创建的类 SessionListener 如下所示。

package cn.mypackage.listener;

import java.util.HashSet;

import javax.servlet.ServletContext;
import javax.servlet.annotation.WebListener;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;

@WebListener
public class SessionListener implements HttpSessionListener {
    @Override
    public void sessionCreated(HttpSessionEvent event) {
        System.out.println("Session Created ---- ");

        HttpSession session = event.getSession();
        session.setMaxInactiveInterval(10);
        System.out.println("Current Session: " + session.getId());

        ServletContext application = session.getServletContext();
        HashSet<HttpSession> sessions = (HashSet<HttpSession>) application.getAttribute("sessions");
        if (sessions == null) {
            sessions = new HashSet<HttpSession>();
            application.setAttribute("sessions", sessions);
        }
        sessions.add(session);
        System.out.println("Current available sessions: " + Integer.valueOf(sessions.size()).toString());
    }

    @Override
    public void sessionDestroyed(HttpSessionEvent event) throws ClassCastException {
        System.out.println("Session Destroyed ---");

        HttpSession session = event.getSession();
        System.out.println("deletedSessionId: " + session.getId());
        System.out.println(session.getCreationTime());
        System.out.println(session.getLastAccessedTime());

        ServletContext application = session.getServletContext();
        HashSet<HttpSession> sessions = (HashSet<HttpSession>) application.getAttribute("sessions");
        sessions.remove(session);
    }
}

我把这个SessionListener.java放在我的/src/main/java/cn/mypackage/listener/文件夹中，我的入口文件在/src/main/java/cn/mypackage/.

但是，每当我打开一个新的私有(private)浏览器窗口并尝试访问任何网址时，服务器端都不会输出任何信息，并且这两个函数中的断点都没有用。

Answer 1

事实证明，问题是我尝试访问的所有 @RequestMapping 都没有传递 HttpSession 参数。仅当访问带有 HttpSession 参数的 url 时，才会创建 session (如果之前没有)。

示例:

@Controller
public class APIController {
    // this will not generate a session if no session exists, therefore not calling the sessionCreated() function
    @RequestMapping("/test1")
    public @ResponseBody String test1() {
        return "test without session";
    }

    // this will generate a session if no session exists, therefore calling the sessionCreated() function
    @RequestMapping("/test2")
    public @ResponseBody String test2(HttpSession session) {
        return "test with session";
    }
}