java實現socket.io客戶端功能

摘要： 基於java做一個socket.io客戶端 前言 最近公司這邊讓我去訂閱一個第三方機構的websocket server，也是頭疼，免不了和對方各種溝通，大家都很忙，收到回覆很慢，開發方向也不知道。先是做了一個普通websocket的客戶端，但後面瞭解到對方是基於socket.io做...

基於java做一個socket.io客戶端

前言

最近公司這邊讓我去訂閱一個第三方機構的websocket server，也是頭疼，免不了和對方各種溝通，大家都很忙，收到回覆很慢，開發方向也不知道。先是做了一個普通websocket的客戶端，但後面瞭解到對方是基於socket.io做的一個server，又重新做了一個基於socket.io-client-java開源庫的客戶端。涉及到公司商業機密，所以做了一個demo，轉自 https://blog.csdn.net/q56231293811/article/details/84873776

<!--more-->

1. Client( Socket.IO Client Library for Java )

先上程式碼

package com.dasnnj.practice.share.socket;

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

import java.util.Arrays;

/**
 * Description <P> TODO : socket.io client端 <P>
 *
 * @author DASNNJ <a href="mailto:dasnnj@outlook.com"> dasnnj@outlook.com </a>
 * @date 2019-04-27 18:32
 */
public class Client {

public static void main(String[] args) {
String url = "http://localhost:9999";
try {
IO.Options options = new IO.Options();
options.transports = new String[]{"websocket"};
//失敗重試次數
options.reconnectionAttempts = 10;
//失敗重連的時間間隔
options.reconnectionDelay = 1000;
//連線超時時間(ms)
options.timeout = 500;
final Socket socket = IO.socket(url, options);
//監聽自定義msg事件
socket.on("msg", objects -> System.out.println("client: 收到msg->" + Arrays.toString(objects)));
//監聽自定義訂閱事件
socket.on("sub", objects -> System.out.println("client: " + "訂閱成功，收到反饋->" + Arrays.toString(objects)));
socket.on(Socket.EVENT_CONNECT, objects -> {
socket.emit("sub", "我是訂閲物件");
System.out.println("client: " + "連線成功");
});
socket.on(Socket.EVENT_CONNECTING, objects -> System.out.println("client: " + "連線中"));
socket.on(Socket.EVENT_CONNECT_TIMEOUT, objects -> System.out.println("client: " + "連線超時"));
socket.on(Socket.EVENT_CONNECT_ERROR, objects -> System.out.println("client: " + "連線失敗"));
socket.connect();
} catch (Exception ex) {
ex.printStackTrace();
}
}
}

流程：

1. 啟動client會建立scoket,並將uri,options等引數set進去
2. 監聽一些事件（可自定義），也就是將event為key，回撥為value，put 進callbacks(其為ConcurrentMap)

   

3. connect 主動連線
4. 當連線成功時候會觸發 Socket.EVENT_CONNECT 事件，執行了 socket.emit("sub", "我是訂閲物件"); 訂閱操作

2. Server( Socket.IO伺服器的開源Java實現。基於Netty伺服器框架。 )

這邊server只監聽了sub事件（server監聽client emit(提交)的sub事件,而client監聽的是server emit（反饋）的sub事件）和斷開連線事件，並迴圈傳送廣播訊息（smg事件）

package com.dasnnj.practice.share.socket;

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

import java.util.Map;

/**
 * Description <P> TODO : socket.io server端 <P>
 *
 * @author DASNNJ <a href="mailto:dasnnj@outlook.com"> dasnnj@outlook.com </a>
 * @date 2019-04-27 18:31
 */

public class Server {
public static void main(String[] args) {
Configuration config = new Configuration();
config.setHostname("localhost");
config.setPort(9999);
SocketIOServer server = new SocketIOServer(config);
server.addConnectListener(client -> {
System.out.println("server: " + client.getRemoteAddress() + "客戶端連線成功");
});
//新增sub事件
server.addEventListener("sub", String.class, (client, data, ackRequest) -> {
String c= client.getRemoteAddress().toString();
//獲取客戶端url引數
Map params = client.getHandshakeData().getUrlParams();
System.out.println("server: " + c+ "：客戶端：訂閱成功，訂閱資訊為->" + data);
//sub事件成功反饋
client.sendEvent("sub", c+ "客戶端你好，我是服務端，你訂閱成功了");
});

//新增客戶端斷開連線事件
server.addDisconnectListener(client -> {
String c= client.getRemoteAddress().toString();
//獲取裝置ip
String clientIp = c.substring(1, c.indexOf(":"));
System.out.println("server: " + clientIp + "-------------------------" + "客戶端已斷開連線");
});
server.start();
int i = 0;
while (true) {
try {
Thread.sleep(1500);
//廣播訊息
i++;
server.getBroadcastOperations().sendEvent("msg", "30", "hello" + i, "false");
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}

3. pom.xml

<?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>com.dasnnj.practice</groupId>
<artifactId>practice</artifactId>
<version>1.0-SNAPSHOT</version>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>8</source>
<target>8</target>
</configuration>
</plugin>
</plugins>
</build>


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

4. 再次感謝

轉自 java netty-socketio 與 io.socket的使用 ，當時看了這位大佬的教程解決了問題