基于java webRct webSocket 实现点对点视频（需要源码的请加支付宝好友）

Posted on 2017-04-11 10:28 爱编程的欧巴阅读(3483) 评论(5) 编辑收藏举报

打开支付宝首页搜“555176706”领红包，即可加好友


<%@ page language="java" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<%
    String ctx = request.getContextPath() + "/";
    pageContext.setAttribute("ctx", ctx);
%>
<html>
<head>
<link rel="canonical" href="${roomLink}" />
<meta http-equiv="X-UA-Compatible" content="chrome=1" />
<script src="./js/channel.js"></script>
<!-- type="text/javascript">
  (function() {
    var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true;
    po.src = 'https://apis.google.com/js/plusone.js';
    var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s);
  })();
-->
<style type="text/css">
a:link {
    color: #ffffff;
}

a:visited {
    color: #ffffff;
}

html,body {
    background-color: #000000;
    height: 100%;
    font-family: Verdana, Arial, Helvetica, sans-serif;
}

body {
    margin: 0;
    padding: 0;
}

#container {
    background-color: #000000;
    position: relative;
    min-height: 100%;
    width: 100%;
    margin: 0px auto;
    -webkit-perspective: 1000;
}

#card {
    -webkit-transition-property: rotation;
    -webkit-transition-duration: 2s;
    -webkit-transform-style: preserve-3d;
}

#local {
    position: absolute;
    width: 100%;
    -webkit-transform: scale(-1, 1);
    -webkit-backface-visibility: hidden;
}

#remote {
    position: absolute;
    width: 100%;
    -webkit-transform: rotateY(180deg);
    -webkit-backface-visibility: hidden;
}

#mini {
    position: absolute;
    height: 30%;
    width: 30%;
    bottom: 32px;
    right: 4px;
    -webkit-transform: scale(-1, 1);
    opacity: 1.0;
}

#localVideo {
    opacity: 0;
    -webkit-transition-property: opacity;
    -webkit-transition-duration: 2s;
}

#remoteVideo {
    opacity: 0;
    -webkit-transition-property: opacity;
    -webkit-transition-duration: 2s;
}

#miniVideo {
    opacity: 0;
    -webkit-transition-property: opacity;
    -webkit-transition-duration: 2s;
}

#footer {
    spacing: 4px;
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 28px;
    background-color: #3F3F3F;
    color: rgb(255, 255, 255);
    font-size: 13px;
    font-weight: bold;
    line-height: 28px;
    text-align: center;
}

#hangup {
    font-size: 13px;
    font-weight: bold;
    color: #FFFFFF;
    width: 128px;
    height: 24px;
    background-color: #808080;
    border-style: solid;
    border-color: #FFFFFF;
    margin: 2px;
}

#logo {
    display: block;
    top: 4;
    right: 4;
    position: absolute;
    float: right;
    opacity: 0.5;
}
</style>
</head>
<body>
    <script type="text/javascript">
        var localVideo;
        var miniVideo;
        var remoteVideo;
        var localStream;
        var remoteStream;
        var channel;
        var channelReady = false;
        var pc;
        var socket;
        var footer;
        var initiator = ${initiator};
        var started = false;
        var isRTCPeerConnection = true;
        var mediaConstraints = {
            'mandatory':{
                'OfferToReceiveAudio' : true,
                'OfferToReceiveVideo' : true
            }
        };
        var isVideoMuted = false;
        var isAudioMuted = false;
        var URL;
        function initialize() {
            console.log("Initializing; room=${roomKey}.");
            card = document.getElementById("card");
            localVideo = document.getElementById("localVideo");
            footer = document.getElementById("footer");
            miniVideo = document.getElementById("miniVideo");
            remoteVideo = document.getElementById("remoteVideo");
            resetStatus();
            openChannel();
            getUserMedia();
            console.log("initialize1");
            URL = (window.URL || window.webkitURL || window.msURL || window.oURL);
        }
        
        function getUserMedia() {
            navigator.getUserMedia = navigator.getUserMedia ||
            navigator.webkitGetUserMedia ||
            navigator.mozGetUserMedia; 
//            if(navigator.getUserMedia){
                try {
//                     navigator.webkitGetUserMedia({
                    navigator.getUserMedia({
                        "audio": true,
                        "video": true
                    }, onUserMediaSuccess, onUserMediaError);
                    console.log("Requested access to local media with new syntax.");
                } catch (e) {
                    try {
                        navigator.getUserMedia("video,audio",onUserMediaSuccess, onUserMediaError);
                        console.log("Requested access to local media with old syntax.");
                    } catch (e) {
                        alert("webkitGetUserMedia() failed. Is the MediaStream flag enabled in about:flags?");
                        console.log("webkitGetUserMedia failed with exception: "+ e.message);
                    }
                }
                console.log("getUserMedia2");
            }
//        }
        
        function onUserMediaSuccess(stream) {
            console.log("User has granted access to local media.");
//             var url = webkitURL.createObjectURL(stream);
            var url = URL.createObjectURL(stream);
            localVideo.style.opacity = 1;
            localVideo.src = url;
            localStream = stream;
            // Caller creates PeerConnection.
            if (initiator)
                maybeStart();
            
            
            console.log("onUserMediaSuccess3");
        }
        
        function maybeStart() {
            if (!started && localStream && channelReady) {
                setStatus("连接中...");
                console.log("Creating PeerConnection.");
                createPeerConnection();
                console.log("Adding local stream.");
                pc.addStream(localStream);
                started = true;
                // Caller initiates offer to peer.
                if (initiator)
                    doCall();
            }
            console.log("maybeStart4");
        }

        function doCall() {
            console.log("Sending offer to peer.");
            if (isRTCPeerConnection) {
                pc.createOffer(setLocalAndSendMessage, null, mediaConstraints);
//                 pc.createOffer(setLocalAndSendMessage,function (error) {
//                     console.log('Failure callback: ' + error);
//                 });
            } else {
                var offer = pc.createOffer(mediaConstraints);
                pc.setLocalDescription(pc.SDP_OFFER, offer);
                sendMessage({
                    type : 'offer',
                    sdp : offer.toSdp()
                });
                pc.startIce();
            }
            console.log("doCall5");
        }

        function setLocalAndSendMessage(sessionDescription) {
            pc.setLocalDescription(sessionDescription);
            sendMessage(sessionDescription);
            console.log("setLocalAndSendMessage6");
        }

        function sendMessage(message) {
            var msgString = JSON.stringify(message);
            console.log('发出信息 : ' + msgString);
            path = 'message?r=${roomKey}' + '&u=${user}';
            var xhr = new XMLHttpRequest();
            xhr.open('POST', path, true);
            xhr.send(msgString);
            console.log("sendMessage7");
        }

        function openChannel() {
            console.log("Opening channel.");
            socket = new WebSocket("ws://"+window.location.host+"${ctx}websocket?u=${user}");
// socket = new WebSocket("ws://10.74.0.154:8080");
            socket.onopen = onChannelOpened;
            socket.onmessage = onChannelMessage;
            socket.onclose = onChannelClosed;
            console.log("openChannel8");
        }

        function resetStatus() {
            if (!initiator) {
                setStatus("让别人加入视频聊天: <a href=\"${roomLink}\">${roomLink}</a>");
            } else {
                setStatus("初始化...");
            }
            console.log("resetStatus9");
        }

        function createPeerConnection() {
            console.log("createPeerConnection9");
            var pc_config = {
                "iceServers" : [ {
                    "url" : "stun:stun.l.google.com:19302"
                } ]
            };
            try {
                pc = new webkitRTCPeerConnection(pc_config);

                pc.onicecandidate = onIceCandidate;
                console.log("Created webkitRTCPeerConnnection with config \""
                        + JSON.stringify(pc_config) + "\".");
            } catch (e) {
                try {
                    var stun_server = "";
                    if (pc_config.iceServers.length !== 0) {
                        stun_server = pc_config.iceServers[0].url.replace(
                                'stun:', 'STUN ');
                    }
                    pc = new webkitPeerConnection00(stun_server,
                            onIceCandidate00);
                    isRTCPeerConnection = false;
                    console.log("Created webkitPeerConnnection00 with config \""
                                    + stun_server + "\".");
                } catch (e) {
                    console.log("Failed to create PeerConnection, exception: "
                            + e.message);
                    alert("Cannot create PeerConnection object; Is the 'PeerConnection' flag enabled in about:flags?");
                    return;
                }
            }

            pc.onconnecting = onSessionConnecting;
            pc.onopen = onSessionOpened;
            pc.onaddstream = onRemoteStreamAdded;
            pc.onremovestream = onRemoteStreamRemoved;
        }

        function setStatus(state) {
            footer.innerHTML = state;
            console.log("setStatus10");
        }

        function doAnswer() {
            console.log("doAnswer11");
            console.log("Sending answer to peer.");
            if (isRTCPeerConnection) {
                pc.createAnswer(setLocalAndSendMessage,null,mediaConstraints);
//                 pc.createAnswer(setLocalAndSendMessage,function (error) {
//                     console.log('Failure callback: ' + error);
//                 });
            } else {
                var offer = pc.remoteDescription;
                var answer = pc.createAnswer(offer.toSdp(), mediaConstraints);
                pc.setLocalDescription(pc.SDP_ANSWER, answer);
                sendMessage({
                    type : 'answer',
                    sdp : answer.toSdp()
                });
                pc.startIce();
            }
        }

        function processSignalingMessage00(message) {
            console.log("processSignalingMessage0012");
            var msg = JSON.parse(message);

            // if (msg.type == 'offer') should not happen here.
            if (msg.type == 'answer' && started) {
                pc.setRemoteDescription(pc.SDP_ANSWER, new SessionDescription(
                        msg.sdp));
            } else if (msg.type == 'candidate' && started) {
                var candidate = new IceCandidate(msg.label, msg.candidate);
                pc.processIceMessage(candidate);
            } else if (msg.type == 'bye' && started) {
                onRemoteHangup();
            }
        }

        var channelOpenTime;
        var channelCloseTime;

        function onChannelOpened() {
            console.log("onChannelOpened13");
            channelOpenTime = new Date();
            console.log("Channel opened.Open time is : "
                    + channelOpenTime.toLocaleString());
            channelReady = true;
            if (initiator)
                maybeStart();
        }
        function onChannelMessage(message) {
            console.log("onChannelMessage14");
            console.log('收到信息 : ' + message.data);
            if (isRTCPeerConnection)
                processSignalingMessage(message.data);//建立视频连接
            else
                processSignalingMessage00(message.data);
        }
        
        function processSignalingMessage(message) {
            console.log("processSignalingMessage15");
            var msg = JSON.parse(message);
            console.log("msg.type:"+msg.type);
            if (msg.type == 'offer') {
                // Callee creates PeerConnection
                if (!initiator && !started)
                    maybeStart();

                // We only know JSEP version after createPeerConnection().
                if (isRTCPeerConnection)
                    pc.setRemoteDescription(new RTCSessionDescription(msg));
                else
                    pc.setRemoteDescription(pc.SDP_OFFER,new SessionDescription(msg.sdp));

                doAnswer();
            } else if (msg.type == 'answer' && started) {
                pc.setRemoteDescription(new RTCSessionDescription(msg));
            } else if (msg.type == 'candidate' && started) {
                var nativeRTCIceCandidate = (window.mozRTCIceCandidate || window.RTCIceCandidate);
                var candidate = new nativeRTCIceCandidate({
                    sdpMLineIndex : msg.label,
                    candidate : msg.candidate
                });
                pc.addIceCandidate(candidate);
            } else if (msg.type == 'bye' && started) {
                onRemoteHangup();
            }
        }
        
        function onChannelError() {
            console.log('Channel error.16');
        }
        function onChannelClosed() {
            console.log('onChannelClosed.17');
            if(!channelOpenTime){
                channelOpenTime = new Date();
            }
            channelCloseTime = new Date();
            console.log("Channel closed.Close time is "
                            + channelOpenTime.toLocaleString()
                            + " ,Keep time : "
                            + ((channelCloseTime.getTime() - channelOpenTime
                                    .getTime()) / 1000 + "s"));
            openChannel();
        }

        function onUserMediaError(error) {
            console.log('onUserMediaError.18');
            console.log("Failed to get access to local media. Error code was "+ error.code);
            alert("Failed to get access to local media. Error code was "+ error.code + ".");
        }

        function onIceCandidate(event) {
            console.log('onIceCandidate.19');
            if (event.candidate) {
                sendMessage({
                    type : 'candidate',
                    label : event.candidate.sdpMLineIndex,
                    id : event.candidate.sdpMid,
                    candidate : event.candidate.candidate
                });
            } else {
                console.log("End of candidates.");
            }
        }

        function onIceCandidate00(candidate, moreToFollow) {
            console.log('onIceCandidate00.20');
            if (candidate) {
                sendMessage({
                    type : 'candidate',
                    label : candidate.label,
                    candidate : candidate.toSdp()
                });
            }

            if (!moreToFollow) {
                console.log("End of candidates.");
            }
        }

        function onSessionConnecting(message) {
            console.log('onSessionConnecting.21');
            console.log("Session connecting.");
        }
        function onSessionOpened(message) {
            console.log('onSessionConnecting.22');
            console.log("Session opened.");
        }

        function onRemoteStreamAdded(event) {
            console.log('onRemoteStreamAdded.23');
            console.log("Remote stream added.");
            console.log("输出远程流"+event.stream);
//             var url = webkitURL.createObjectURL(event.stream);
            var url = URL.createObjectURL(event.stream);
            miniVideo.src = localVideo.src;
            remoteVideo.src = url;
            console.log(url+"www.baidu.com");
            remoteStream = event.stream;
            
            waitForRemoteVideo();
        }
        function onRemoteStreamRemoved(event) {
            console.log('onRemoteStreamAdded.24');
            console.log("Remote stream removed.");
        }

        function onHangup() {
            console.log('onHangup.25');
            console.log("Hanging up.");
            transitionToDone();
            stop();
            socket.close();

        }

        function onRemoteHangup() {
            console.log('onRemoteHangup.26');
            console.log('Session terminated.');
            transitionToWaiting();
            stop();
            initiator = 0;
        }

        function stop() {
            console.log('stop.27');
            started = false;
            isRTCPeerConnection = true;
            isAudioMuted = false;
            isVideoMuted = false;
            pc.close();
            pc = null;
        }

        function waitForRemoteVideo() {
            console.log('waitForRemoteVideo.28');
            console.log("videoTracks："+remoteStream.getVideoTracks().length);
            console.log("remoteVideo.currentTime:"+remoteVideo.currentTime);
//             console.log("remoteStream.videoTracks.length:"+remoteStream.videoTracks.length);
            if (remoteStream.getVideoTracks().length == 1 || remoteVideo.currentTime > 0) {
                transitionToActive();
            } else {
                setTimeout(waitForRemoteVideo, 100);
            }
        }
        function transitionToActive() {
            console.log('transitionToActive.29');
            remoteVideo.style.opacity = 1;
            card.style.webkitTransform = "rotateY(180deg)";
            setTimeout(function() {
                localVideo.src = "";
            }, 500);
            setTimeout(function() {
                miniVideo.style.opacity = 1;
            }, 1000);
            setStatus("<input type=\"button\" id=\"hangup\" value=\"Hang up\" onclick=\"onHangup()\" />");
        }
        function transitionToWaiting() {
            console.log('transitionToWaiting.30');
            card.style.webkitTransform = "rotateY(0deg)";
            setTimeout(function() {
                localVideo.src = miniVideo.src;
                miniVideo.src = "";
                remoteVideo.src = ""
            }, 500);
            miniVideo.style.opacity = 0;
            remoteVideo.style.opacity = 0;
            resetStatus();
        }
        function transitionToDone() {
            console.log('transitionToDone.31');
            localVideo.style.opacity = 0;
            remoteVideo.style.opacity = 0;
            miniVideo.style.opacity = 0;
            setStatus("You have left the call. <a href=\"{{ room_link }}\">Click here</a> to rejoin.");
        }
        function enterFullScreen() {
            console.log('enterFullScreen.32');
            container.webkitRequestFullScreen();
        }

        function toggleVideoMute() {
            console.log('toggleVideoMute.33');            
            if (localStream.getVideoTracks().length == 0) {
                console.log("No local video available.");
                return;
            }

            if (isVideoMuted) {
                for (i = 0; i < localStream.getVideoTracks().length; i++) {
                    localStream.getVideoTracks[i].enabled = true;
                }
                console.log("Video unmuted.");
            } else {
                for (i = 0; i < localStream.getVideoTracks().length; i++) {
                    localStream.getVideoTracks[i].enabled = false;
                }
                console.log("Video muted.");
            }

            isVideoMuted = !isVideoMuted;
        }

        function toggleAudioMute() {
            console.log("toggleAudioMute34");
            if (localStream.getAudioTracks().length == 0) {
                console.log("No local audio available.");
                return;
            }

            if (isAudioMuted) {
                for (i = 0; i < localStream.getAudioTracks().length; i++) {
                    localStream.audioTracks[i].enabled = true;
                }
                console.log("Audio unmuted.");
            } else {
                for (i = 0; i < localStream.getAudioTracks().length; i++) {
                    localStream.getAudioTracks()[i].enabled = false;
                }
                console.log("Audio muted.");
            }

            isAudioMuted = !isAudioMuted;
        }

        setTimeout(initialize, 1);

        // Send BYE on refreshing(or leaving) a demo page
        // to ensure the room is cleaned for next session.
        window.onbeforeunload = function() {
            sendMessage({
                type : 'bye'
            });
        }

        // Ctrl-D: toggle audio mute; Ctrl-E: toggle video mute.
        // On Mac, Command key is instead of Ctrl.
        // Return false to screen out original Chrome shortcuts.
        document.onkeydown = function() {
            if (navigator.appVersion.indexOf("Mac") != -1) {
                if (event.metaKey && event.keyCode == 68) {
                    toggleAudioMute();
                    return false;
                }
                if (event.metaKey && event.keyCode == 69) {
                    toggleVideoMute();
                    return false;
                }
            } else {
                if (event.ctrlKey && event.keyCode == 68) {
                    toggleAudioMute();
                    return false;
                }
                if (event.ctrlKey && event.keyCode == 69) {
                    toggleVideoMute();
                    return false;
                }
            }
        }
    </script>
    <div id="container" ondblclick="enterFullScreen()">
        <div id="card">
            <div id="local">
                <video width="100%" height="100%" id="localVideo"
                    autoplay="autoplay" />
            </div>
            <div id="remote">
                <video width="100%" height="100%" id="remoteVideo"
                    autoplay="autoplay"> </video>
                <div id="mini">
                    <video width="100%" height="100%" id="miniVideo" autoplay="autoplay" />
                </div>
            </div>
        </div>
        <div id="footer"></div>
        <a href="http://www.webrtc.org"> <img id="logo" alt="WebRTC"
            src="${ctx}images/webrtc_black_20p.png"> </a>
    </div>
</body>
</html>

环境必须是jdk1.7,tomcat7才能把项目运行起来，把tomat的lib包下的catalian.jar,tomcat-coyote.jar加入项目中

package org.rtc.servlet;

import java.io.IOException;
import java.util.UUID;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang.StringUtils;
import org.rtc.room.WebRTCRoomManager;

@WebServlet(urlPatterns = {"/room"})
public class WebRTCRoomServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;
    
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        this.doPost(request, response);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String r = request.getParameter("r");
        if(StringUtils.isEmpty(r)){
            //如果房间为空，则生成一个新的房间号
            r = String.valueOf(System.currentTimeMillis());
            response.sendRedirect("room?r=" + r);
        }else{
            Integer initiator = 1;
            String user = UUID.randomUUID().toString().replace("-", "");//生成一个用户ID串
            if(!WebRTCRoomManager.haveUser(r)){//第一次进入可能是没有人的，所以就要等待连接，如果有人进入了带这个房间好的页面就会发起视频通话的连接
                initiator = 0;//如果房间没有人则不发送连接的请求
            }
            WebRTCRoomManager.addUser(r, user);//向房间中添加一个用户
            String roomLink = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort() +  request.getContextPath() +"/room?r=" + r;
            String roomKey = r;//设置一些变量
            request.setAttribute("initiator", initiator);
            request.setAttribute("roomLink", roomLink);
            request.setAttribute("roomKey", roomKey);
            request.setAttribute("user", user);
            request.getRequestDispatcher("index.jsp").forward(request, response);
        }
    }
}

package org.rtc.servlet;

import java.io.BufferedReader;
import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang.StringUtils;
import org.rtc.room.WebRTCRoomManager;
import org.rtc.websocket.WebRTCMessageInboundPool;

import net.sf.json.JSONObject;

@WebServlet(urlPatterns = {"/message"})
public class WebRTCMessageServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        super.doPost(request, response);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String r = request.getParameter("r");//房间号
        String u = request.getParameter("u");//通话人
        BufferedReader br = request.getReader();
        String line = null;
        StringBuilder sb = new StringBuilder();
        while((line = br.readLine())!=null){
            sb.append(line); //获取输入流，主要是视频定位的信息
        }
        
        String message = sb.toString();
        JSONObject json = JSONObject.fromObject(message);
        if (json != null) {
            String type = json.getString("type");
            if ("bye".equals(type)) {//客户端退出视频聊天
                System.out.println("user :" + u + " exit..");
                if(StringUtils.isNotEmpty(r)){
                    WebRTCRoomManager.removeUser(r, u);
                }else{
                    System.out.println("没有该房间号");
                }

package org.rtc.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.catalina.websocket.StreamInbound;
import org.apache.catalina.websocket.WebSocketServlet;
import org.rtc.websocket.WebRTCMessageInbound;
@WebServlet(urlPatterns = { "/websocket"})
public class WebRTCWebSocketServlet extends WebSocketServlet {

    private static final long serialVersionUID = 1L;

    private String user;
    
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        this.user = request.getParameter("u");
        super.doGet(request, response);
    }

    @Override
    protected StreamInbound createWebSocketInbound(String subProtocol,HttpServletRequest request) {
        return new WebRTCMessageInbound(user);
    }
}

package org.rtc.room;

import java.util.HashMap;
import java.util.Map;

public class WebRTCRoomManager {

    private static final Map<String,WebRTCSimpleRoom> provider = new HashMap<String,WebRTCSimpleRoom>();
    
    public static void addUser(String roomKey,String user){
        WebRTCSimpleRoom room = provider.get(roomKey);
        if(room == null){
            System.out.println("add room : " + roomKey);
            room = new WebRTCSimpleRoom(roomKey,user);
            provider.put(roomKey, room);
        }else{
            room.addUser(user);
        }
    }
    
    public static void removeUser(String roomKey,String user){
        WebRTCSimpleRoom room = provider.get(roomKey);
        if(room != null){
            System.out.println("remove user : " + user);
            room.removeUser(user);
        }
        if(!room.haveUser()){
            provider.remove(roomKey);
            System.out.println("remove room : " + roomKey);
        }
    }
    
    public static boolean haveUser(String key){
        WebRTCSimpleRoom room = provider.get(key);
        if(room != null){
            return room.haveUser();
        }else{
            return false;
        }
    }
    
    public static String getOtherUser(String roomKey,String user){
        WebRTCSimpleRoom room = provider.get(roomKey);
        return room.getOtherUser(user);
    }
}

package org.rtc.room;

import org.apache.commons.lang.StringUtils;

public class WebRTCSimpleRoom {

    private String key;

    private String user1;

    private String user2;
    
    public WebRTCSimpleRoom(){
        
    }
    
    public WebRTCSimpleRoom(String key,String user1){
        this.key = key;
        this.user1 = user1;
    }

    /**
     * @return the key
     */
    public String getKey() {
        return key;
    }

    /**
     * @param key
     *            the key to set
     */
    public void setKey(String key) {
        this.key = key;
    }

    public String getUser1() {
        return user1;
    }

    public void setUser1(String user1) {
        this.user1 = user1;
    }

    public String getUser2() {
        return user2;
    }

    public void setUser2(String user2) {
        this.user2 = user2;
    }

    public void addUser(String user) {
        if (StringUtils.isEmpty(user1)) {
            this.setUser1(user);
        } else if (StringUtils.isEmpty(user2)) {
            this.setUser2(user);
        }
    }

    public void removeUser(String user) {
        if (StringUtils.isNotEmpty(user1)) {
            if (user1.equals(user)) {
                this.setUser1(null);
            }
        } else if (StringUtils.isNotEmpty(user2)) {
            if (user2.equals(user)) {
                this.setUser2(null);
            }
        }
    }

    public boolean haveUser() {
        return !(this.getUser1() == null && this.getUser2() == null);
    }
    
    public String getOtherUser(String user){
        if(user.equals(user1)){
            return user2;
        }else{
            return user1;
        }
    }
}

package org.rtc.websocket;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;

import org.apache.catalina.websocket.MessageInbound;
import org.apache.catalina.websocket.WsOutbound;

public class WebRTCMessageInbound extends MessageInbound {

    private final String user;

    public WebRTCMessageInbound(String user) {
        this.user = user;
    }
    
    public String getUser(){
        return this.user;
    }

    @Override
    protected void onOpen(WsOutbound outbound) {
        //触发连接事件，在连接池中添加连接
        WebRTCMessageInboundPool.addMessageInbound(this);
    }

    @Override
    protected void onClose(int status) {
        //触发关闭事件，在连接池中移除连接
        WebRTCMessageInboundPool.removeMessageInbound(this);
    }

    @Override
    protected void onBinaryMessage(ByteBuffer message) throws IOException {
        throw new UnsupportedOperationException(
                "Binary message not supported.");
    }

    @Override
    protected void onTextMessage(CharBuffer message) throws IOException {
        
    }
}

package org.rtc.websocket;

import java.io.IOException;
import java.nio.CharBuffer;
import java.util.HashMap;
import java.util.Map;

public class WebRTCMessageInboundPool {

    private static final Map<String,WebRTCMessageInbound > connections = new HashMap<String,WebRTCMessageInbound>();
    
    public static void addMessageInbound(WebRTCMessageInbound inbound){
        //添加连接
        System.out.println("user : " + inbound.getUser() + " join..");
        connections.put(inbound.getUser(), inbound);
    }
    
    public static void removeMessageInbound(WebRTCMessageInbound inbound){
        //移除连接
        System.out.println("user : " + inbound.getUser() + " exit..");
        connections.remove(inbound.getUser());
    }
    
    public static void sendMessage(String user,String message){
        try {
            //向特定的用户发送数据
            System.out.println("send message to user : " + user + " ,message content : " + message);
            WebRTCMessageInbound inbound = connections.get(user);
            if(inbound != null){
                inbound.getWsOutbound().writeTextMessage(CharBuffer.wrap(message));
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}


            }
        }
        String otherUser = WebRTCRoomManager.getOtherUser(r, u);//获取通话的对象
        if (u.equals(otherUser)) {
            message = message.replace("\"offer\"", "\"answer\"");
            message = message.replace("a=crypto:0 AES_CM_128_HMAC_SHA1_32",
                    "a=xrypto:0 AES_CM_128_HMAC_SHA1_32");
            message = message.replace("a=ice-options:google-ice\\r\\n", "");
        }
        //向对方发送连接数据
        WebRTCMessageInboundPool.sendMessage(otherUser, message);
    }
}

可以新建一个web项目部署一下试试。

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