Tomcat session数量能统计吗？
如题

——解决方案——————–
个人认为可以：在application中定义一个数量，利用HttpSessionListener在session创建时＋1，session销毁时-1.
——解决方案——————–

Java code

package web;

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

public class CountListener implements HttpSessionListener {
 private int count=0;
    public void sessionCreated(HttpSessionEvent arg0) {
        System.out.println("sessionCreated");
        count++;
        HttpSession session=arg0.getSession();
        ServletContext sctx=session.getServletContext();
        sctx.setAttribute("count", count);


    }

    public void sessionDestroyed(HttpSessionEvent arg0) {
        System.out.println("sessionDestroyed");
        count--;
        HttpSession session=arg0.getSession();
        ServletContext sctx=session.getServletContext();
        sctx.setAttribute("count", count);
    }

}
<br><span style="color: #e78608;" data-mce-style="color: #e78608;">------解决方案--------------------</span><br>

Java code

package com.test;

import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;
class SessionCountListener implements HttpSessionListener{
 public static long sessionCount=0;
  @Override
  public void sessionCreated(HttpSessionEvent arg0) {
    sessionCount++;
  }

  @Override
  public void sessionDestroyed(HttpSessionEvent arg0) {
    // TODO Auto-generated method stub

  }
}