netty-socket.io点对点通讯和聊天室通讯

netty-socketio是基于netty的socket.io服务实现，可以无缝对接前端使用的socketio-client.js。 
相对于javaee的原生websocket支持（@serverEndpoint）和spring-boot的MessageBroker(@messageMapping)，netty-socketio绝对是最好用的websocket后台实现。因为netty-socketio完整的实现了socket.io提供的监听前台事件、向指定客户端发送事件、将指定客户端加入指定房间、向指定房间广播事件、客户端从指定房间退出等操作。

msg实体

package com.song.netty;

import java.io.Serializable;

public class Msg implements Serializable{
    private static final long serialVersionUID = -6519304261259719883L;

    private String userId;

    private String userName;

    private String receiveUserId;

    private String content;

    public String getUserId() {
        return userId;
    }

    public void setUserId(String userId) {
        this.userId = userId;
    }


    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getReceiveUserId() {
        return receiveUserId;
    }

    public void setReceiveUserId(String receiveUserId) {
        this.receiveUserId = receiveUserId;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

    public Msg(String userId, String userName, String receiveUserId, String content) {
        super();
        this.userId = userId;
        this.userName = userName;
        this.receiveUserId = receiveUserId;
        this.content = content;
    }

    public Msg() {
        super();
    }


}

聊天室通讯服务端可与多个客户端通讯

测试方法，在不同浏览器各打开一个聊天室页面，发送消息，全部都会接收到

监听聊天室通讯事件

package com.song.netty;

import com.corundumstudio.socketio.AckRequest;
import com.corundumstudio.socketio.SocketIOClient;
import com.corundumstudio.socketio.SocketIOServer;
import com.corundumstudio.socketio.listener.DataListener;

public class OneToManyChartListener implements DataListener<Msg>{

    SocketIOServer server;

    public void setServer(SocketIOServer server) {
        this.server = server;
    }

    public void onData(SocketIOClient socketIoClient, Msg msg, AckRequest askSender) throws Exception {
        System.out.println("一对多"+socketIoClient.getSessionId());
        // chatevent为 事件的名称， data为发送的内容
        this.server.getBroadcastOperations().sendEvent("chatMany", msg);
    }
}

 点对点通讯客户端只与服务端通讯

测试方法，在不同浏览器各打开一个聊天室页面，发送消息，只有发送消息的那个客服端才能接收到消息

监听点对点通讯事件

package com.song.netty;

import com.corundumstudio.socketio.AckRequest;
import com.corundumstudio.socketio.SocketIOClient;
import com.corundumstudio.socketio.SocketIOServer;
import com.corundumstudio.socketio.listener.DataListener;

public class OneToOneChartListener implements DataListener<Msg>{

    SocketIOServer server;

    public void setServer(SocketIOServer server) {
        this.server = server;
    }

    public void onData(SocketIOClient socketIoClient, Msg msg, AckRequest askSender) throws Exception {
        System.out.println("一对一"+socketIoClient.getSessionId());
        // chatevent为 事件的名称， data为发送的内容
        this.server.getClient(socketIoClient.getSessionId()).sendEvent("chatOne", msg);
    }
}

客户端使用socket.io，首先启动server，推送消息时服务端获取客户端，向客户端发送消息。客户端接收消息后刷新页面数据。

package com.song.netty;

import com.corundumstudio.socketio.Configuration;
import com.corundumstudio.socketio.SocketIOServer;

public class MsgServer {
    public static void main(String[] args) throws InterruptedException {
        Configuration config = new Configuration();
        config.setHostname("localhost");
        config.setPort(8888);
        SocketIOServer server = new SocketIOServer(config);
        OneToOneChartListener listner = new OneToOneChartListener();
        listner.setServer(server);
        OneToManyChartListener listnerMany = new OneToManyChartListener();
        listnerMany.setServer(server);
        // chatOne,chatMany为事件名称
        server.addEventListener("chatOne", Msg.class, listner);
        server.addEventListener("chatMany", Msg.class, listnerMany);
        //启动服务
        server.start();
        Thread.sleep(Integer.MAX_VALUE);
        server.stop();
    }
}

特别注意netty的版本，版本过低会导致使用socket.io通讯时跨域

<dependency>
    <groupId>com.corundumstudio.socketio</groupId>
    <artifactId>netty-socketio</artifactId>
    <version>1.7.14</version>
</dependency>

跨域错误如下

XMLHttpRequest cannot load http://myserver/socket.io/1/?t=1400445162388. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'myclient.com' is therefore not allowed access.

前台测试页面代码一对一

<!DOCTYPE html>
<html>
<head>
<meta charset="GB2312">
<title>聊天室</title><base>
<script src="jquery-1.9.1.js" type="text/javascript"></script>
<script type="text/javascript" src="socket.io.js"></script>
<script src="ckeditor/ckeditor.js"></script>
<style>
body {
    padding: 20px;
}
#console {
    height: 450px;
    overflow: auto;
}
.username-msg {
    color: orange;
}
.connect-msg {
    color: green;
}
.disconnect-msg {
    color: red;
}
.send-msg {
    color: #888
}
</style>
</head>
<body>
    <h1>聊天室</h1>
    <!-- <br /> -->
    <div id="console" class="well"></div>
    <form class="well form-inline" onsubmit="return false;">
        <input id="name"  class="input-xlarge" type="hidden" placeholder="用户名称. . . " />
        <!-- <input id="msg" class="input-xlarge" type="text" placeholder="发送内容. . . " /> -->
        <textarea id="msg" rows="10" cols="50" placeholder="发送内容. . . "></textarea>
        <button type="button" onClick="sendMessage()" class="btn">发送</button>
        <button type="button" onClick="sendDisconnect()" class="btn">下线</button>
        <button type="button" onClick="reloadThis()" class="btn">重连</button>
    </form>
</body>
<script type="text/javascript">
var editor = CKEDITOR.replace( 'msg' );
editor.on("instanceReady",function(){
    /* this.document.onkeydown=function(event){
         alert(0);
         var e = event || window.event || arguments.callee.caller.arguments[0];

         if(event.ctrlKey&&event.keyCode==13){ // enter 键
             //要做的事情
             paraent.sendMessage();
         }
    };  */
    this.document.on("keydown",function(){
        //console.log(window.frames[0]);
        var event = window.frames[0].event;
          if(event.ctrlKey&&event.keyCode==13){ // enter 键
             //要做的事情
            sendMessage();
         } 
    });
});

var socket;
connect();
//var socket = io.connect('http://192.168.0.207:9092');


function connect(){
    socket = io.connect('ws://127.0.0.1:9092');
    $("#name").val("你的小宝贝儿"+parseInt(Math.random()*100+1, 10));

    socket.on('connect',function() {
        serverOutput('<span class="connect-msg">欢迎进入聊天室!</span>');
        //serverOutput('<span class="disconnect-msg">'+$("#name").val()+'已上线! </span>');
        socket.emit('chatOne', {
            userId:1,
            userName : $("#name").val(),
            receiveUserId:2,
            content : "已上线!"
        });
    });

    socket.on('chatOne', function(data) {
        output('<span class="username-msg">'+'<img  src="images/head.jpg" height="64" width="64"/>' + data.userName + ' : </span>'
                + data.content);
        //editor.setData("");
        //editor.updateElement();
    });

    socket.on('disconnect',function() {
        serverOutput('<span class="disconnect-msg">'+$("#name").val()+'已下线! </span>');

    });
}

function reloadThis(){
    socket.disconnect();
    connect();
    console.log(socket);
}

function sendDisconnect() {
    socket.emit('chatOne', {
        userId:1,
        userName : $("#name").val(),
        receiveUserId:2,
        content : "已下线!"
    });
    socket.disconnect();
}

function sendMessage() {
    var userName = $("#name").val()
    var message = editor.getData();
    $('#msg').val('');
    socket.emit('chatOne', {
        userId:1,
        userName : userName,
        receiveUserId:2,
        content : message
    });
    //editor.setData("");
}

function output(message) {
    var currentTime = "<span class='time' >" + new Date() + "</span>";
    var element = $("<div>" +" "  + message + "</div>");
    $('#console').prepend(element);
}

function serverOutput(message){
    var element = $("<div>" + message + "</div>");
    $('#console').prepend(element);
}

document.onkeydown=function(event){
    //alert(0);
    var e = event || window.event || arguments.callee.caller.arguments[0];

    if(event.ctrlKey&&event.keyCode==13){ // enter 键
        //要做的事情
        sendMessage();
    }
}; 
</script>
</html>

聊天室页面

<!DOCTYPE html>
<html>
<head>
<meta charset="GB2312">
<title>聊天室</title><base>
<script src="jquery-1.9.1.js" type="text/javascript"></script>
<script type="text/javascript" src="socket.io.js"></script>
<script src="ckeditor/ckeditor.js"></script>
<style>
body {
    padding: 20px;
}
#console {
    height: 450px;
    overflow: auto;
}
.username-msg {
    color: orange;
}
.connect-msg {
    color: green;
}
.disconnect-msg {
    color: red;
}
.send-msg {
    color: #888
}
</style>
</head>
<body>
    <h1>聊天室</h1>
    <!-- <br /> -->
    <div id="console" class="well"></div>
    <form class="well form-inline" onsubmit="return false;">
        <input id="name"  class="input-xlarge" type="hidden" placeholder="用户名称. . . " />
        <!-- <input id="msg" class="input-xlarge" type="text" placeholder="发送内容. . . " /> -->
        <textarea id="msg" rows="10" cols="50" placeholder="发送内容. . . "></textarea>
        <button type="button" onClick="sendMessage()" class="btn">发送</button>
        <button type="button" onClick="sendDisconnect()" class="btn">下线</button>
        <button type="button" onClick="reloadThis()" class="btn">重连</button>
    </form>
</body>
<script type="text/javascript">
var editor = CKEDITOR.replace( 'msg' );
editor.on("instanceReady",function(){
    /* this.document.onkeydown=function(event){
         alert(0);
         var e = event || window.event || arguments.callee.caller.arguments[0];

         if(event.ctrlKey&&event.keyCode==13){ // enter 键
             //要做的事情
             paraent.sendMessage();
         }
    };  */
    this.document.on("keydown",function(){
        //console.log(window.frames[0]);
        var event = window.frames[0].event;
          if(event.ctrlKey&&event.keyCode==13){ // enter 键
             //要做的事情
            sendMessage();
         } 
    });
});

var socket;
connect();
//var socket = io.connect('http://192.168.0.207:9092');


function connect(){
    socket = io.connect('ws://127.0.0.1:9092');
    $("#name").val("你的小宝贝儿"+parseInt(Math.random()*100+1, 10));

    socket.on('connect',function() {
        serverOutput('<span class="connect-msg">欢迎进入聊天室!</span>');
        //serverOutput('<span class="disconnect-msg">'+$("#name").val()+'已上线! </span>');
        socket.emit('chatMany', {
            userId:1,
            userName : $("#name").val(),
            receiveUserId:2,
            content : "已上线!"
        });
    });

    socket.on('chatMany', function(data) {
        output('<span class="username-msg">'+'<img  src="images/head.jpg" height="64" width="64"/>' + data.userName + ' : </span>'
                + data.content);
        //editor.setData("");
        //editor.updateElement();
    });

    socket.on('disconnect',function() {
        serverOutput('<span class="disconnect-msg">'+$("#name").val()+'已下线! </span>');

    });
}

function reloadThis(){
    socket.disconnect();
    connect();
    console.log(socket);
}

function sendDisconnect() {
    socket.emit('chatMany', {
        userId:1,
        userName : $("#name").val(),
        receiveUserId:2,
        content : "已下线!"
    });
    socket.disconnect();
}

function sendMessage() {
    var userName = $("#name").val()
    var message = editor.getData();
    $('#msg').val('');
    socket.emit('chatMany', {
        userId:1,
        userName : userName,
        receiveUserId:2,
        content : message
    });
    //editor.setData("");
}

function output(message) {
    var currentTime = "<span class='time' >" + new Date() + "</span>";
    var element = $("<div>" +" "  + message + "</div>");
    $('#console').prepend(element);
}

function serverOutput(message){
    var element = $("<div>" + message + "</div>");
    $('#console').prepend(element);
}

document.onkeydown=function(event){
    //alert(0);
    var e = event || window.event || arguments.callee.caller.arguments[0];

    if(event.ctrlKey&&event.keyCode==13){ // enter 键
        //要做的事情
        sendMessage();
    }
}; 
</script>
</html>

 源码链接