HTML5WebSocket点对点聊天实现方法

public class InitServlet extends HttpServlet {
 private static final long serialVersionUID = -3163557381361759907L; 
 private static HashMap<String,MessageInbound> socketList; 
 public void init(ServletConfig config) throws ServletException { 
 InitServlet.socketList = new HashMap<String,MessageInbound>(); 
 super.init(config); 
 System.out.println("初始化聊天容器"); 
 } 

 public static HashMap<String,MessageInbound> getSocketList() { 
 return InitServlet.socketList; 
 } 
}

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
 http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">

 <servlet>
 <servlet-name>websocket</servlet-name>
 <servlet-class>socket.MyWebSocketServlet</servlet-class>
 </servlet>
 <servlet-mapping>
 <servlet-name>websocket</servlet-name>
 <url-pattern>*.do</url-pattern>
 </servlet-mapping>

 <servlet>
 <servlet-name>initServlet</servlet-name>
 <servlet-class>socket.InitServlet</servlet-class>
 <load-on-startup>1</load-on-startup><!--方法执行的级别-->
 </servlet>
 <welcome-file-list>
 <welcome-file>index.jsp</welcome-file>
 </welcome-file-list>
</web-app>

public class MyWebSocketServlet extends WebSocketServlet {
 public String getUser(HttpServletRequest request){
 String userName = (String) request.getSession().getAttribute("user");
 if(userName==null){
 return null;
 }
 return userName; 
 } 
 protected StreamInbound createWebSocketInbound(String arg0,
 HttpServletRequest request) {
 System.out.println("用户" + request.getSession().getAttribute("user") + "登录");
 return new MyMessageInbound(this.getUser(request)); 
 }
}

package socket;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.util.HashMap;
import org.apache.catalina.websocket.MessageInbound;
import org.apache.catalina.websocket.WsOutbound;
import util.MessageUtil;
public class MyMessageInbound extends MessageInbound {
 private String name;
 public MyMessageInbound() {
 super();
 }

 public MyMessageInbound(String name) {
 super();
 this.name = name;
 }

 @Override 
 protected void onBinaryMessage(ByteBuffer arg0) throws IOException { 

 } 

 @Override 
 protected void onTextMessage(CharBuffer msg) throws IOException { 
 //用户所发消息处理后的map
 HashMap<String,String> messageMap = MessageUtil.getMessage(msg); //处理消息类
 //上线用户集合类map
 HashMap<String, MessageInbound> userMsgMap = InitServlet.getSocketList();
 String fromName = messageMap.get("fromName"); //消息来自人 的userId
 String toName = messageMap.get("toName"); //消息发往人的 userId
 //获取该用户
 MessageInbound messageInbound = userMsgMap.get(toName); //在仓库中取出发往人的MessageInbound
 MessageInbound messageFromInbound = userMsgMap.get(fromName);
 if(messageInbound!=null && messageFromInbound!=null){ //如果发往人 存在进行操作
 WsOutbound outbound = messageInbound.getWsOutbound(); 
 WsOutbound outFromBound = messageFromInbound.getWsOutbound();
 String content = messageMap.get("content"); //获取消息内容
 String msgContentString = fromName + "说: " + content; //构造发送的消息
 //发出去内容
 CharBuffer toMsg = CharBuffer.wrap(msgContentString.toCharArray());
 CharBuffer fromMsg = CharBuffer.wrap(msgContentString.toCharArray());
 outFromBound.writeTextMessage(fromMsg);
 outbound.writeTextMessage(toMsg); //
 outFromBound.flush();
 outbound.flush();
 }
 } 

 @Override 
 protected void onClose(int status) { 
 InitServlet.getSocketList().remove(this); 
 super.onClose(status); 
 } 

 @Override
 protected void onOpen(WsOutbound outbound) { 
 super.onOpen(outbound); 
 //登录的用户注册进去
 if(name!=null){
 InitServlet.getSocketList().put(name, this);//存放客服ID与用户
 }
 }

 @Override
 public int getReadTimeout() {
 return 0;
 } 
}

package util;
import java.nio.CharBuffer;
import java.util.HashMap;
public class MessageUtil {
 public static HashMap<String,String> getMessage(CharBuffer msg) {
 HashMap<String,String> map = new HashMap<String,String>();
 String msgString = msg.toString();
 String m[] = msgString.split(",");
 map.put("fromName", m[0]);
 map.put("toName", m[1]);
 map.put("content", m[2]);
 return map;
 }
}

<%@ page language="java" contentType="text/html; charset=UTF-8"
 pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Index</title>
<script type="text/javascript" src="js/jquery-1.7.2.min.js"></script>
<%session.setAttribute("user", "小化");%>
<script type="text/javascript">
var ws = null;
function startWebSocket() {
 if ('WebSocket' in window)
 ws = new WebSocket("ws://localhost:8080/WebSocketUser/websocket.do");
 else if ('MozWebSocket' in window)
 ws = new MozWebSocket("ws://localhost:8080/WebSocketUser/websocket.do");
 else
 alert("not support");


 ws.onmessage = function(evt) {
 //alert(evt.data);
 console.log(evt);
 // $("#xiaoxi").val(evt.data);
 setMessageInnerHTML(evt.data);
 };
 function setMessageInnerHTML(innerHTML){
 document.getElementById('message').innerHTML += innerHTML + '<br/>';
 }
 ws.onclose = function(evt) {
 //alert("close");
 document.getElementById('denglu').innerHTML="离线";
 };

 ws.onopen = function(evt) {
 //alert("open");
 document.getElementById('denglu').innerHTML="在线";
 document.getElementById('userName').innerHTML='小化';
 };
}
function sendMsg() {
 var fromName = "小化";
 var toName = document.getElementById('name').value; //发给谁
 var content = document.getElementById('writeMsg').value; //发送内容
 ws.send(fromName+","+toName+","+content);//注意格式
}
</script>
</head>
<body onload="startWebSocket();">
<p>聊天功能实现</p>
登录状态：
<span id="denglu" style="color:red;">正在登录</span>
<br>
登录人：
<span id="userName"></span>
<br>
<br>
<br>
发送给谁：<input type="text" id="name" value="小明"></input>
<br>
发送内容：<input type="text" id="writeMsg"></input>
<br>
聊天框：<p id="message" style="height: 250px;width: 280px;border: 1px solid; overflow: auto;"></p>
<br>
<input type="button" value="send" onclick="sendMsg()"></input>
</body>
</html>