一、简介
netty-socketio是一个开源的Socket.io服务器端的一个java的实现，它基于Netty框架。项目地址为：https://github.com/mrniko/netty-socketio 。socket.io是一个跨浏览器使用websocket为实时实时应用提供服务。本例子使用maven构建，依赖如下：
<dependency> <groupId>com.corundumstudio.socketiogroupId> <artifactId>netty-socketioartifactId> <version>1.6.5version> dependency>
客户端使用的是socket.io-client，下载地址为:https://github.com/Automattic/socket.io-client。
二、相关代码
服务器端：
消息实体
1 package com.test.socket; 2 3 public class ChatObject { 4 5 private String userName; 6 private String message; 7 8 public ChatObject() { 9 } 10 11 public ChatObject(String userName, String message) { 12 super(); 13 this.userName = userName; 14 this.message = message; 15 } 16 17 public String getUserName() { 18 return userName; 19 } 20 21 public void setUserName(String userName) { 22 this.userName = userName; 23 } 24 25 public String getMessage() { 26 return message; 27 } 28 29 public void setMessage(String message) { 30 this.message = message; 31 } 32 33 }
监听器
1 package com.test.socket; 2 3 import com.corundumstudio.socketio.AckRequest; 4 import com.corundumstudio.socketio.SocketIOClient; 5 import com.corundumstudio.socketio.SocketIOServer; 6 import com.corundumstudio.socketio.listener.DataListener; 7 8 public class CharteventListener implements DataListener{ 9 10 SocketIOServer server; 11 12 public void setServer(SocketIOServer server) { 13 this.server = server; 14 } 15 16 public void onData(SocketIOClient client, ChatObject data, 17 AckRequest ackSender) throws Exception { 18 //chatevent为 事件的名称，data为发送的内容 19 this.server.getBroadcastOperations().sendEvent("chatevent", data); 20 } 21 22 }
服务器端启动代码
1 package com.test.socket; 2 3 import com.corundumstudio.socketio.Configuration; 4 import com.corundumstudio.socketio.SocketIOServer; 5 6 public class SocketServer { 7 public static void main(String[] args) throws InterruptedException { 8 9 Configuration config = new Configuration(); 10 config.setHostname("localhost"); 11 config.setPort(9092); 12 13 SocketIOServer server = new SocketIOServer(config); 14 15 CharteventListener listner = new CharteventListener(); 16 listner.setServer(server); 17 // chatevent为事件名称 18 server.addEventListener("chatevent", ChatObject.class, listner); 19 //启动服务 20 server.start(); 21 22 Thread.sleep(Integer.MAX_VALUE); 23 24 server.stop(); 25 } 26 27 } 28
运行该类，服务器端即可启动
客户端message.html代码如下:
1 DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2 <html> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 5 <title>Insert title heretitle> 6 <script src="./jquery-1.9.1.js" type="text/javascript">script> 7 <script type="text/javascript" src="./socket.io/socket.io.js">script> 8 <style> 9 body { 10 padding:20px; 11 } 12 #console { 13 height: 400px; 14 overflow: auto; 15 } 16 .username-msg {color:orange;} 17 .connect-msg {color:green;} 18 .disconnect-msg {color:red;} 19 .send-msg {color:#888} 20 style> 21 head> 22 <body> 23 <h1>Netty-socketio示例h1> 24 <br/> 25 <div id="console" class="well"> 26 div> 27 <form class="well form-inline" onsubmit="return false;"> 28 <input id="name" class="input-xlarge" type="text" placeholder="用户名称..."/> 29 <input id="msg" class="input-xlarge" type="text" placeholder="发送内容..."/> 30 <button type="button" onClick="sendMessage()" class="btn">Sendbutton> 31 <button type="button" onClick="sendDisconnect()" class="btn">Disconnectbutton> 32 form> 33 body> 34 <script type="text/javascript"> 35 var socket = io.connect('http://localhost:9092'); 36 37 socket.on('connect', function() { 38 output('Client has connected to the server!'); 39 }); 40 41 socket.on('chatevent', function(data) { 42 output('' + data.userName + ': ' + data.message); 43 }); 44 45 socket.on('disconnect', function() { 46 output('The client has disconnected!'); 47 }); 48 function sendDisconnect() { 49 socket.disconnect(); 50 } 51 52 function sendMessage() { 53 var userName = $("#name").val() 54 var message = $('#msg').val(); 55 $('#msg').val(''); 56 socket.emit('chatevent', {userName: userName, message: message}); 57 } 58 59 function output(message) { 60 var currentTime = "" + new Date() + ""; 61 var element = $("" + currentTime + " " + message + ""); 62 $('#console').prepend(element); 63 } 64 script> 65 html>
客户端需要引入jquery与socket.io.js文件。
在浏览器打开该html文件,输入用户名称以及消息内容发送，服务器端获取到发送的内容之后，会将该消息发送会客户端，客户端接收到从服务器端返回的消息或，将该消息添加到页面并显示。运行效果如下图:
