java使用监听统计网站信息，并获取session中对应的ip

用java listener统计在线人数，并获取session中对应的ip

在web.xml中添加。注意放到

<listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener>

spring监听器之后，否则会报错

  <listener>
    <listener-class>com.xxx.xxx.util.SessionListener</listener-class>
  </listener>

import org.springframework.stereotype.Component;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.ServletRequestEvent;
import javax.servlet.ServletRequestListener;
import javax.servlet.http.*;
import java.util.HashMap;
import java.util.Map;

/**
 * SESSION 监听
 */
@Component
public class SessionListener implements HttpSessionListener, HttpSessionAttributeListener, ServletContextListener, ServletRequestListener {
    //用Map来存储session，sessionid作为key session作为value

    public IViewNumService viewNumService;

    private static Map sessionMap = new HashMap<String, HttpSession>();

    HttpServletRequest request;

    public void sessionCreated(HttpSessionEvent se) {
        //当session 创建的时候，例如我要监听统计在线人数 并且获取当前session的ip
        HttpSession session = se.getSession();
        String ip = request.getRemoteAddr();//获取客户端ip
        session.setAttribute("ip", ip);
        String sid = session.getId();//获取sessionId
        sessionMap.put(sid, session);

        DateTime dateTime = DateTime.of(session.getCreationTime());
        String formattedTime = dateTime.toString("yyyy-MM-dd HH:mm:ss");
//        System.out.println("---2session创建时间:" + formattedTime);
        System.out.println("----SESSIONID:" + sid + "---2session创建时间:" + formattedTime + " " + ip);
        ViewNum viewNum = new ViewNum();
        viewNum.setRID(new GUID().toString());
        viewNum.setNTIME(formattedTime);
        viewNum.setNYEAR(String.valueOf(dateTime.year()));
        viewNum.setNMONTH(String.valueOf(dateTime.month()));
        viewNum.setNDAY(String.valueOf(dateTime.getDay()));
        viewNum.setNIP(ip);
        viewNumService.save(viewNum);
    }

    public static int getOline() {
        return sessionMap.size();//获取在线人数，获取到session 就可以拿到ip了
    }

    public void requestDestroyed(ServletRequestEvent arg0) {

    }

    public void requestInitialized(ServletRequestEvent sre) {
        request = (HttpServletRequest) sre.getServletRequest();//获取request
    }

    public void sessionDestroyed(HttpSessionEvent arg0) {
        // 销毁session或者session超时时
    }

    public void attributeAdded(HttpSessionBindingEvent arg0) {
        //这里是监听当session调用setAtrribute()方法时，例如用户登录，将用户信息设置进session

    }

    public void attributeRemoved(HttpSessionBindingEvent arg0) {
        //这里监听当session调用removeAttribute()方法时

    }

    public void attributeReplaced(HttpSessionBindingEvent arg0) {

    }

    public void contextDestroyed(ServletContextEvent arg0) {

    }

    public void contextInitialized(ServletContextEvent arg0) {

    }

}