很容易啊~~~session里面放个变量 time ,记录最后一次回复消息的时间 ,客户端反正定时刷新页面的,你只要在有刷新的地方加入了判断就行了 int x = 0; //设定时间,注意单位是毫秒 Date time = (Date)request.getSession().getAttribute("time"); Date now = new Date(); if(now.getTime()-time.getTime()>x) response.sendRedirect("/index.jsp");
HttpSession session = event.getSession(); ServletContext application = session.getServletContext(); List list = (List) application.getAttribute("userlist"); if (list == null) { list = new ArrayList(); application.setAttribute("userlist", list); } list.add(userName); application.setAttribute("userlist", list); } public void valueUnbound(HttpSessionBindingEvent event) {
HttpSession session = event.getSession(); ServletContext application = session.getServletContext(); List list = (List) application.getAttribute("userlist"); list.remove(userName); application.setAttribute("userlist", list);
}
public void printUserlist(ServletContext application) {
List list = (List) application.getAttribute("userlist"); Iterator iter = list.iterator(); if(iter.hasNext()) { String user = (String)iter.next(); System.out.print(user); while(iter.hasNext()) { user = (String)iter.next(); System.out.print(user); }
} } public int getUserId() { return userId; } public String getUserName() { return userName; } public void setUserId(int i) { userId = i; } public void setUserName(String string) { userName = string; }}在用户登陆的时候记得把上面的对象实例话后放入session <%@ page import="com.Userinfor"%> <% String userName = ""; int userId = 0; //userId和userName请自己从数据库取数据 if(session.getAttribute("userinfor")==null) { Userinfor userinfor = new Userinfor(); userinfor.setUserId(userId); userinfor.setUserName(userName); session.setAttribute("userinfor",userinfor); } %>
int x = 0; //设定时间,注意单位是毫秒
Date time = (Date)request.getSession().getAttribute("time");
Date now = new Date();
if(now.getTime()-time.getTime()>x) response.sendRedirect("/index.jsp");
* 创建日期 2004-8-21
*
*
*
*/
package com;/**
* @author WuBin
*
*
*
*/
import java.util.*;
import javax.servlet.http.*;
import javax.servlet.ServletContext;public class Userlist implements HttpSessionBindingListener {
// 用户信息
int userId;
String userName; public void valueBound(HttpSessionBindingEvent event) {
HttpSession session = event.getSession();
ServletContext application = session.getServletContext();
List list = (List) application.getAttribute("userlist");
if (list == null) {
list = new ArrayList();
application.setAttribute("userlist", list);
}
list.add(userName);
application.setAttribute("userlist", list);
}
public void valueUnbound(HttpSessionBindingEvent event) {
HttpSession session = event.getSession();
ServletContext application = session.getServletContext();
List list = (List) application.getAttribute("userlist");
list.remove(userName);
application.setAttribute("userlist", list);
}
public void printUserlist(ServletContext application) {
List list = (List) application.getAttribute("userlist");
Iterator iter = list.iterator();
if(iter.hasNext()) {
String user = (String)iter.next();
System.out.print(user);
while(iter.hasNext()) {
user = (String)iter.next();
System.out.print(user);
}
}
} public int getUserId() {
return userId;
} public String getUserName() {
return userName;
} public void setUserId(int i) {
userId = i;
} public void setUserName(String string) {
userName = string;
}}在用户登陆的时候记得把上面的对象实例话后放入session
<%@ page import="com.Userinfor"%>
<%
String userName = "";
int userId = 0; //userId和userName请自己从数据库取数据
if(session.getAttribute("userinfor")==null) {
Userinfor userinfor = new Userinfor();
userinfor.setUserId(userId);
userinfor.setUserName(userName);
session.setAttribute("userinfor",userinfor);
}
%>