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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><!--方法執(zhí)行的級別-->
    </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("用戶" + request.getSession().getAttribute("user") + "登錄");
        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 { 
        //用戶所發(fā)消息處理后的map
        HashMap<String,String> messageMap = MessageUtil.getMessage(msg);    //處理消息類
        //上線用戶集合類map
        HashMap<String, MessageInbound> userMsgMap = InitServlet.getSocketList();
        String fromName = messageMap.get("fromName");    //消息來自人 的userId
        String toName = messageMap.get("toName");         //消息發(fā)往人的 userId
        //獲取該用戶
        MessageInbound messageInbound = userMsgMap.get(toName);    //在倉庫中取出發(fā)往人的MessageInbound
        MessageInbound messageFromInbound = userMsgMap.get(fromName);
        if(messageInbound!=null && messageFromInbound!=null){     //如果發(fā)往人 存在進行操作
            WsOutbound outbound = messageInbound.getWsOutbound(); 
            WsOutbound outFromBound = messageFromInbound.getWsOutbound();
            String content = messageMap.get("content");  //獲取消息內(nèi)容
            String msgContentString = fromName + "說: " + content;   //構造發(fā)送的消息
            //發(fā)出去內(nèi)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);  
        //登錄的用戶注冊進去
        if(name!=null){
            InitServlet.getSocketList().put(name, this);//存放客服ID與用戶
        }
    }

    @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="離線";
    };

    ws.onopen = function(evt) {
        //alert("open");
        document.getElementById('denglu').innerHTML="在線";
        document.getElementById('userName').innerHTML='小化';
    };
}
function sendMsg() {
    var fromName = "小化";
    var toName = document.getElementById('name').value;  //發(fā)給誰
    var content = document.getElementById('writeMsg').value; //發(fā)送內(nèi)容
    ws.send(fromName+","+toName+","+content);//注意格式
}
</script>
</head>
<body onload="startWebSocket();">
<p>聊天功能實現(xiàn)</p>
登錄狀態(tài)：
<span id="denglu" style="color:red;">正在登錄</span>
<br>
登錄人：
<span id="userName"></span>
<br>
<br>
<br>
發(fā)送給誰：<input type="text" id="name" value="小明"></input>
<br>
發(fā)送內(nèi)容：<input type="text" id="writeMsg"></input>
<br>
聊天框：<div id="message" style="height: 250px;width: 280px;border: 1px solid; overflow: auto;"></div>
<br>
<input type="button" value="send" onclick="sendMsg()"></input>
</body>
</html>