java netty-socketio 与 io.socket的使用

   netty-socketio 是仿照node.js 实现的socket.io服务端，而io.socket是客户端，这里写两个示例，介绍服务端和客户端怎么写。

1、服务器端

首先是pom 文件,引用netty-socketio和slf4j-nop这两个库即可。

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>l</groupId>
    <artifactId>nskse</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <dependencies>
        <dependency>
            <groupId>com.corundumstudio.socketio</groupId>
            <artifactId>netty-socketio</artifactId>
            <version>1.7.16</version>
        </dependency>

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-nop</artifactId>
            <version>1.7.2</version>
        </dependency>

    </dependencies>

</project>

服务器端示例代码如下：

import com.corundumstudio.socketio.AckRequest;
import com.corundumstudio.socketio.Configuration;
import com.corundumstudio.socketio.SocketIOClient;
import com.corundumstudio.socketio.SocketIOServer;
import com.corundumstudio.socketio.listener.ConnectListener;
import com.corundumstudio.socketio.listener.DataListener;
import com.corundumstudio.socketio.listener.DisconnectListener;

import java.util.Map;


public class ServerStart {

    public static void main(String [] args){
        Configuration config = new Configuration();
        config.setHostname("localhost");
        config.setPort(9999);
        SocketIOServer server = new SocketIOServer(config);
        server.addConnectListener(new ConnectListener() {
            // 添加客户端连接监听器
            public void onConnect(SocketIOClient client) {
                //logger.info(client.getRemoteAddress() + " web客户端接入");
                //不知道如何与客户端对应，好的办法是自己去写对应的函数
                client.sendEvent("connected", "hello");
            }
        });

        //监听客户端事件，client_info为事件名称，-自定义事件
         server.addEventListener("client_info", String.class, new DataListener<String>(){
            public void onData(SocketIOClient client, String data, AckRequest ackRequest) throws ClassNotFoundException {
                //客户端推送advert_info事件时，onData接受数据，这里是string类型的json数据，还可以为Byte[],object其他类型
                String sa = client.getRemoteAddress().toString();
                String clientIp = sa.substring(1,sa.indexOf(":"));//获取客户端连接的ip
                Map params = client.getHandshakeData().getUrlParams();//获取客户端url参数
                System.out.println(clientIp+"：客户端：************"+data);
            }
         });

        //添加客户端断开连接事件
        server.addDisconnectListener(new DisconnectListener(){
            public void onDisconnect(SocketIOClient client) {
                String sa = client.getRemoteAddress().toString();
                String clientIp = sa.substring(1,sa.indexOf(":"));//获取设备ip
                System.out.println(clientIp+"-------------------------"+"客户端已断开连接");
                //给客户端发送消息
                client.sendEvent("advert_info",clientIp+"客户端你好，我是服务端，期待下次和你见面");
            }
        });
        server.start();

        while (true){
            try {
                Thread.sleep(1500);
                //广播消息
                server.getBroadcastOperations().sendEvent("borcast","are you live?");
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

其中，广播消息的写法如下，客户端可以选择需要的消息进行接收：

 server.getBroadcastOperations().sendEvent("borcast","are you live?");

如果服务器需要对客户端进行分组，组队，那么需要自己去创建管理client，正确的添加client和正确的删除client，或者有开源库可以实现？
打包方式建议使用jar，这样设置jvm启动参数，可以连接更多的客户端。

2、客户端代码

io.socket的使用介绍较少，这个库开源代码在https://github.com/socketio/socket.io-client-java上面，客户端pom文件如下:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>
    <groupId>learn</groupId>
    <artifactId>nskc</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <dependencies>
        <dependency>
            <groupId>io.socket</groupId>
            <artifactId>socket.io-client</artifactId>
            <version>1.0.0</version>
        </dependency>
    </dependencies>
</project>

客户端代码如下:

import io.socket.client.IO;
import io.socket.client.Socket;
import io.socket.emitter.Emitter;

public class AppStart {

    public static void main(String [] args){
        String url ="http://localhost:9999";
        try{
            IO.Options options = new IO.Options();
            options.transports = new String[]{"websocket"};
            options.reconnectionAttempts = 2;
            options.reconnectionDelay = 1000;//失败重连的时间间隔
            options.timeout = 500;//连接超时时间(ms)
            //par1 是任意参数
            final Socket socket = IO.socket(url+"?par1=1234", options);

            socket.on(Socket.EVENT_CONNECT, new Emitter.Listener() {

                public void call(Object... args) {
                    socket.send("hello");
                }
            });

            //自定义事件
            socket.on("borcast", new Emitter.Listener() {
                public void call(Object... objects) {
                    System.out.println("receive borcast data:" + objects[0].toString());
                }
            });

            socket.on("connected", new Emitter.Listener() {
                public void call(Object... objects) {
                    System.out.println("receive connected data:" + objects[0].toString());
                }
            });

            socket.connect();
            //循环发送数据
            while (true){
                socket.emit("client_info"," 客户端在发送数据");
                Thread.sleep(2000);
            }
        }catch (Exception ex){
            ex.printStackTrace();
        }
    }
}

重连没有测试，总体运行下来，这两个是可以进行通信的，运行结果如图所示。