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

packagecom.song.netty;importjava.io.Serializable;public class Msg implementsSerializable{private static final long serialVersionUID = -6519304261259719883L;privateString userId;privateString userName;privateString receiveUserId;privateString content;publicString getUserId() {returnuserId;

}public voidsetUserId(String userId) {this.userId =userId;

}publicString getUserName() {returnuserName;

}public voidsetUserName(String userName) {this.userName =userName;

}publicString getReceiveUserId() {returnreceiveUserId;

}public voidsetReceiveUserId(String receiveUserId) {this.receiveUserId =receiveUserId;

}publicString getContent() {returncontent;

}public voidsetContent(String content) {this.content =content;

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

}publicMsg() {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

packagecom.song.netty;importcom.corundumstudio.socketio.AckRequest;importcom.corundumstudio.socketio.SocketIOClient;importcom.corundumstudio.socketio.SocketIOServer;importcom.corundumstudio.socketio.listener.DataListener;public class OneToManyChartListener implements DataListener{

SocketIOServer server;public voidsetServer(SocketIOServer server) {this.server =server;

}public void onData(SocketIOClient socketIoClient, Msg msg, AckRequest askSender) throwsException {

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

packagecom.song.netty;importcom.corundumstudio.socketio.AckRequest;importcom.corundumstudio.socketio.SocketIOClient;importcom.corundumstudio.socketio.SocketIOServer;importcom.corundumstudio.socketio.listener.DataListener;public class OneToOneChartListener implements DataListener{

SocketIOServer server;public voidsetServer(SocketIOServer server) {this.server =server;

}public void onData(SocketIOClient socketIoClient, Msg msg, AckRequest askSender) throwsException {

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。

packagecom.song.netty;importcom.corundumstudio.socketio.Configuration;importcom.corundumstudio.socketio.SocketIOServer;public classMsgServer {public static void main(String[] args) throwsInterruptedException {

Configuration config= newConfiguration();

config.setHostname("localhost");

config.setPort(8888);

SocketIOServer server= newSocketIOServer(config);

OneToOneChartListener listner= newOneToOneChartListener();

listner.setServer(server);

OneToManyChartListener listnerMany= newOneToManyChartListener();

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

com.corundumstudio.socketio

netty-socketio

1.7.14

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

聊天室

}#console{height:450px;overflow:auto;

}.username-msg{color:orange;

}.connect-msg{color:green;

}.disconnect-msg{color:red;

}.send-msg{color:#888}

聊天室