JSP頁面代碼：

Insert title here

function createRequest(){

var httpRequest;

if(window.XMLHttpRequest){

//firefox,safari

httpRequest = new XMLHttpRequest();

}else if(window.ActiveXObject){

//IE

httpRequest = new ActiveXObject("Microsoft.XMLHTTP");

}

return httpRequest;

}

function chat(){

var username = document.getElementById("username").value;

var message = document.getElementById("message").value;

document.getElementById("message").value="";

var req= createRequest();

req.onreadystatechange = function(){

if(req.readyState ==4){

var messageinfo = req.responseText;

document.getElementById("messageinfo").innerHTML = messageinfo;

}

}

req.open('POST','ChatRoomServlet',true);

req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

req.send("username="+username+"&message="+message);

}

function chatrequest(){

var request = createRequest();

request.onreadystatechange = function(){

if(request.readyState == 4){

var messageinfo = request.responseText;

document.getElementById("messageinfo").innerHTML=messageinfo;

}

}

request.open('POST','ChatRoomServlet',true);

request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

request.send(null);

}

function autoDownLoadmessage(){

window.setInterval(function(){chatrequest()},1000);

}

autoDownLoadmessage();

用戶名：

聊天信息： ?

servlet代碼：

package com.demo.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.ArrayList;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

* Servlet implementation class ChatRoomServlet

*/

public class ChatRoomServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

private static List chatlist = new ArrayList() ;

public ChatRoomServlet() {

super();

// TODO Auto-generated constructor stub

}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

request.setCharacterEncoding("utf-8");

response.setCharacterEncoding("utf-8");

String username = request.getParameter("username");

String message = request.getParameter("message");

String messageall = username+":"+message;

if(username != null && message != null&&!username.equals("")&&!message.equals("")){

chatlist.add(messageall);

}

PrintWriter out = response.getWriter();

for(int i=0; i

out.print(chatlist.get(i)+"");

}

if(chatlist.size() == 30){

chatlist.removeAll(chatlist);

chatlist.add(messageall);

}

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

this.doGet(request, response);

}

}

總結

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