如何统计JAVA网站访问次数并获得访问者IP

  简言之,如果不用第三方提供的接口

  那最好的解决方案应该是当SESSION建立时sessionCreated(),在访问总数和当前在线人数上+1

  当SESSION销毁时sessionDistroyed(),在线人数-1

  核心方法是利用Listener监听的各种接口

  我把代码(主要部分)贴在下面

  此段代码我亲自使用过,没有问题

  但因为继承了接口,有些未使用的方法也要补充进去,具体方式比如在MyEclipse中可以靠点错误,ADD UNIMPLEMENTED METHOD实现

  package com.eaie.system;

  import java.io.FileOutputStream;

  import java.io.InputStream;

  import java.io.PrintWriter;

  import java.net.MalformedURLException;

  import java.net.URL;

  import java.util.Enumeration;

  import java.util.Set;

  import javax.servlet.RequestDispatcher;

  import javax.servlet.Servlet;

  import javax.servlet.ServletContext;

  import javax.servlet.ServletContextEvent;

  import javax.servlet.ServletException;

  import javax.servlet.ServletRequestEvent;

  import javax.servlet.ServletRequestListener;

  import javax.servlet.http.HttpServletRequest;

  import javax.servlet.http.HttpSessionActivationListener;

  import javax.servlet.http.HttpSessionEvent;

  import javax.servlet.http.HttpSessionListener;

  public class SessionListener implements HttpSessionActivationListener,

  HttpSessionListener, ServletContext, ServletRequestListener {

  ServletContext context;

  int onLineUserNum = 0;

  int visitNum = 0;

  HttpServletRequest request;

  public void sessionDidActivate(HttpSessionEvent session) {

  log("seesionDidActive("+session.getSession().getId()+")");

  }

  public void sessionWillPassivate(HttpSessionEvent session) {

  log("seesionWillPassivate("+session.getSession().getId()+")");

  }

  public void sessionCreated(HttpSessionEvent event) {

  onLineUserNum++;

  visitNum ++;

  String ip = request.getRemoteAddr();

  log("sessionCreated('"+event.getSession().getId()+"'),-->IP:"+ip);

  context.setAttribute("onLineUserNum", new Integer(onLineUserNum));

  context.setAttribute("visitNum", new Integer(visitNum));

  }

  public void sessionDestroyed(HttpSessionEvent event) {

  if (onLineUserNum>0){

  onLineUserNum--;

  }

  String ip = request.getRemoteAddr();

  log("sessionDestroyed('"+event.getSession().getId()+"'),-->IP:"+ip);

  context.setAttribute("onLineUserNum", new Integer(onLineUserNum));

  }

  public void contextDestroyed(ServletContextEvent sce){

  log("contextDestroyed-->ServletContext is destroyed");

  this.context = null;

  }

  public void contextInitialized(ServletContextEvent sce){

  this.context = sce.getServletContext();

  log("contextDestroyed-->ServletContext is initialized");

  }

  public int getUserOnline(){

  return this.onLineUserNum;

  }

  public void log(String message) {

  PrintWriter out = null;

  try{

  out = new PrintWriter(new FileOutputStream("c:\\eaieLogger.txt",true));

  out.println(new java.util.Date().toLocaleString()+"::From SessionListener:"+message);

  out.println("Totle visit number:"+this.visitNum+" and current online num: "+onLineUserNum);

  out.println("=================================");

  out.close();

  }catch(Exception e){

  e.printStackTrace();

  out.close();

  }

  }

  public void requestInitialized(ServletRequestEvent event) {

  request = (HttpServletRequest)event.getServletRequest();

  }

  //省略其他方法

  }

  这个程序需要在web.xml中配置:

  <listener>

  <listener-class>com.eaie.system.SessionListener</listener-class>

  </listener>

  需要注意的是LISTENR的位置,必须在<FILTER>的相关配置之后,在<SERVLET>的相关配置之前

 

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