javascript - Java套接字io未知传输未定义

Question

当我尝试从 java socket.io 客户端连接 node.js 时，出现此错误:

engine intercepting request for path "/socket.io/" +0ms
engine handling "GET" http request "/socket.io/1/" +0ms
engine unknown transport "undefined" +0ms

同时，当我从 JavaScript 客户端尝试时，工作正常:

engine intercepting request for path "/socket.io/" +0ms
engine handling "GET" http request "/socket.io/?EIO=3&transport=polling&t=1494940689150-0&b64=1" +0ms
engine handshaking client "3EFWO3PTlnvZksM8AAAA" +15ms

我的Java客户端代码:

import io.socket.IOAcknowledge;
import io.socket.IOCallback;
import io.socket.SocketIO;
import io.socket.SocketIOException;

import org.json.JSONException;
import org.json.JSONObject;

public class BasicExample implements IOCallback {
    private SocketIO socket;

    public static void main(String[] args) {
        try {
            new BasicExample();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public BasicExample() throws Exception {

            socket = new SocketIO();
            socket.connect("http://localhost:9990", this);

            socket.send("Hello Server");

            // Sends a JSON object to the server.
            socket.send(new JSONObject().put("key", "value").put("key2","another value"));

            // Emits an event to the server.
            socket.emit("event", "argument1", "argument2", 13.37);
    }

    @Override
    public void onMessage(JSONObject json, IOAcknowledge ack) {
        try {
            System.out.println("Server said:" + json.toString(2));
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void onMessage(String data, IOAcknowledge ack) {
        System.out.println("Server said: " + data);
    }

    @Override
    public void onError(SocketIOException socketIOException) {
        System.out.println("an Error occured");
        socketIOException.printStackTrace();
    }

    @Override
    public void onDisconnect() {
        System.out.println("Connection terminated.");
    }

    @Override
    public void onConnect() {
        System.out.println("Connection established");
    }

    @Override
    public void on(String event, IOAcknowledge ack, Object... args) {
        System.out.println("Server triggered event '" + event + "'");
    }
}

在Java中，我使用从这里下载的socketio.jar http://www.java2s.com/Code/Jar/s/Downloadsocketiojar.htm ，这似乎是从这里编译的 https://github.com/Gottox/socket.io-java-client

在node.js服务器中，我是用户socket.io@1.0.6版本。

请问有人可以帮助我吗？

Answer 1

这个客户端看起来已经过时了大约 5 年。看来这是一个较新的:https://github.com/socketio/socket.io-client-java