login.java

本系统是用jsp和javaBean实现的在线聊天室。实现了聊天室的基本功能。

package com.bwm.login;
import javax.servlet.http.HttpSessionBindingListener;
import javax.servlet.http.HttpSessionBindingEvent;
import javax.servlet.ServletContext;
import java.util.*;
public class login implements HttpSessionBindingListener{
	private String username=null;
	private boolean quit=false;
        private ServletContext application;
 public login(ServletContext application,String username){
    this.application=application;
    this.username=username;
 }
public void valueBound(HttpSessionBindingEvent event){
    if(application.getAttribute("userList")!=null){
        Vector userList=(Vector)application.getAttribute("userList");
        userList.addElement(username);
        application.setAttribute("userList", userList);
    }
    Vector message;
    if(application.getAttribute("message")!=null){
        message=(Vector)application.getAttribute("message");
    }else{
        message=new Vector();
    }
    message.addElement(new String("all@@"+username+"来到了聊天室"));
    application.setAttribute("message", message);
}
public void valueUnbound(HttpSessionBindingEvent event){
    if(!quit){
        Vector message;
        if(application.getAttribute("message")!=null){
            message=(Vector)application.getAttribute("message");
            message.addElement(new String("all@@"+username+"不声不响地走了!!!"));
            application.setAttribute("message",message);
        }
        Vector userList=(Vector)application.getAttribute("userList");
        userList.removeElement(username);
        application.setAttribute("userList",userList);
    }
}
 public String getUserName(){
    return username;
 }
 public void setUserName(){
    this.username=username;
 }
 public boolean isQuit(){
     return quit;
 }
 public void setQuit(boolean quit){
     this.quit=quit;
 }
}