本文實(shí)例為大家分享了Javaweb統(tǒng)計(jì)在線人數(shù)示的具體代碼，供大家參考，具體內(nèi)容如下
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1. 實(shí)現(xiàn)功能
統(tǒng)計(jì)在線人數(shù)
顯示每個(gè)人的sessionId、Ip、第一次登錄時(shí)間
2. 運(yùn)用監(jiān)聽(tīng)器種類
3. 實(shí)現(xiàn)思想
4. 包目錄
5. 代碼實(shí)現(xiàn)
User
重慶分公司
重慶分公司
package entity;
public class User {
private String sessionID;
private String ip;
private String firstTime;
public String getSessionID() {
return sessionID;
}
public void setSessionID(String sessionID) {
this.sessionID = sessionID;
}
public String getIp() {
return ip;
}
public void setIp(String ip) {
this.ip = ip;
}
public String getFirstTime() {
return firstTime;
}
public void setFirstTime(String firstTime) {
this.firstTime = firstTime;
}
}MyHttpSessionListener
package listenner;
import java.util.ArrayList;
import javax.servlet.annotation.WebListener;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;
import entity.User;
import util.SessionUtil;
@WebListener
public class MyHttpSessionListener implements HttpSessionListener {
private int num = 0;//統(tǒng)計(jì)人數(shù)
public void sessionCreated(HttpSessionEvent se) {
num++;
se.getSession().getServletContext().setAttribute("number", num);
}
@SuppressWarnings("unchecked")
public void sessionDestroyed(HttpSessionEvent se) {
num--;
se.getSession().getServletContext().setAttribute("number", num);
//在此用戶被銷毀的時(shí)候，將鏈表中對(duì)應(yīng)的用戶對(duì)象刪除
ArrayList userlist = (ArrayList) se.getSession().getServletContext().getAttribute("userlist");
if (SessionUtil.getUserBySessionID(userlist, se.getSession().getId()) != null) {
userlist.remove(SessionUtil.getUserBySessionID(userlist, se.getSession().getId()));
}
}
} MyServeltRequestListener
package listenner;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import javax.servlet.ServletRequestEvent;
import javax.servlet.ServletRequestListener;
import javax.servlet.annotation.WebListener;
import javax.servlet.http.HttpServletRequest;
import entity.User;
import util.SessionUtil;
@WebListener
public class MyServeltRequestListener implements ServletRequestListener {
@SuppressWarnings("unchecked")
public void requestInitialized(ServletRequestEvent sre) {
ArrayList userlist=null;
//獲取全局變量中的鏈表，若不存在，則創(chuàng)建一個(gè)新的鏈表
userlist= (ArrayList) sre.getServletContext().getAttribute("userlist");
if (userlist == null) {
userlist = new ArrayList();
}
//獲取request對(duì)象
HttpServletRequest request = (HttpServletRequest) sre.getServletRequest();
//獲取sessionID
String sessionID = request.getSession().getId();
//通過(guò)sessionID在鏈表中查找對(duì)象，若沒(méi)有此對(duì)象，則創(chuàng)建加入到鏈表中
if (SessionUtil.getUserBySessionID(userlist, sessionID) == null) {
User user = new User();
user.setSessionID(sessionID);
user.setFirstTime(new SimpleDateFormat("YYYY-MM-DD hh:mm:ss").format(new Date()));
user.setIp(request.getRemoteAddr());
userlist.add(user);
}
//將鏈表設(shè)置為全局變量
sre.getServletContext().setAttribute("userlist", userlist);
}
} getUserBySessionID
package util;
import java.util.ArrayList;
import entity.User;
public class SessionUtil {
//工具類，通過(guò)session在鏈表中找到相應(yīng)的用戶對(duì)象
public static User getUserBySessionID(ArrayList userlist, String sessionID) {
for (int i = 0; i < userlist.size(); i++) {
User user=userlist.get(i);
if (user.getSessionID().equals(sessionID)){
return user;
}
}
return null;
}
} index.jsp
<%@page import="entity.User"%> <%@page import="java.util.ArrayList"%> <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>當(dāng)前在線人數(shù):${number}
<% ArrayListuserlist = (ArrayList ) request.getServletContext().getAttribute("userlist"); if (userlist != null) { for (int i = 0; i < userlist.size(); i++) { User user = userlist.get(i); %> sessionID：<%=user.getSessionID()%>
IP:<%=user.getIp()%>
FirstName:<%=user.getFirstTime()%>
<%}}%>
以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持創(chuàng)新互聯(lián)。
