如何使用 SocketIO 将 Android 客户端与 Node.js 服务器连接？答案

【问题标题】：How to connect Android Client with Node.js server using SocketIO?如何使用 SocketIO 将 Android 客户端与 Node.js 服务器连接？
【发布时间】：2014-12-07 10:10:11
【问题描述】：

我正在尝试使用 SocketIO 从 Android 客户端连接 Node.js，但我在 Logcat 中遇到 SocketTimeOutException。

我的代码：

MainActivity.java

package com.example.androidtestclient;

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

import java.net.MalformedURLException;

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

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

try {
    SocketIO socket = new SocketIO("http://10.42.0.32:3000/");


    socket.connect(new IOCallback() {
        @Override
        public void onMessage(JSONObject json, IOAcknowledge ack) {
            try {
                System.out.println("Server said:" + json.toString(2));
                // display("Connectet  and " + json.toString(2));
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }

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

        @Override
        public void onError(SocketIOException socketIOException) {
            System.out.println("an Error occured");
            Log.d("error", "an error occured");
            // display("not Connectet == error occured ");
            socketIOException.printStackTrace();
        }

        @Override
        public void onDisconnect() {
            System.out.println("Connection terminated.");
            Log.e("disconnect", "Connection terminated");
            // display("disConnectet ");
        }

        @Override
        public void onConnect() {
            System.out.println("Connection established");
            Log.v("connect", "Connection established");
            // display("Connectet  and done");
        }

        @Override
        public void on(String event, IOAcknowledge ack, Object... args) {
            System.out
                    .println("Server triggered event '" + event + "'");
            Log.v("ON", "Server triggered event '" + event + "'");
            // display("Connectet  and " + event);
        }
    });

    // This line is cached until the connection is establisched.
    socket.send("Hello Server!");
} catch (MalformedURLException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

} }

Node.js 代码

var http = require('http');
var io   = require('socket.io');
var app = http.createServer();

app.listen(3000);

console.log('Server running at http://127.0.0.1:3000/');

例外：

12-07 15:28:53.396: W/System.err(4141): io.socket.SocketIOException: Error while handshaking
12-07 15:28:53.396: W/System.err(4141):     at io.socket.IOConnection.handshake(IOConnection.java:322)
12-07 15:28:53.396: W/System.err(4141):     at io.socket.IOConnection.access$7(IOConnection.java:292)
12-07 15:28:53.396: W/System.err(4141):     at io.socket.IOConnection$ConnectThread.run(IOConnection.java:199)
12-07 15:28:53.396: W/System.err(4141): Caused by: java.net.SocketTimeoutException
12-07 15:28:53.396: W/System.err(4141):     at java.net.PlainSocketImpl.read(PlainSocketImpl.java:491)
12-07 15:28:53.396: W/System.err(4141):     at java.net.PlainSocketImpl.access$000(PlainSocketImpl.java:46)
12-07 15:28:53.396: W/System.err(4141):     at java.net.PlainSocketImpl$PlainSocketInputStream.read(PlainSocketImpl.java:240)
12-07 15:28:53.396: W/System.err(4141):     at java.io.InputStream.read(InputStream.java:163)
12-07 15:28:53.396: W/System.err(4141):     at java.io.BufferedInputStream.fillbuf(BufferedInputStream.java:142)
12-07 15:28:53.396: W/System.err(4141):     at java.io.BufferedInputStream.read(BufferedInputStream.java:227)
12-07 15:28:53.396: W/System.err(4141):     at libcore.io.Streams.readAsciiLine(Streams.java:201)
12-07 15:28:53.396: W/System.err(4141):     at libcore.net.http.HttpEngine.readResponseHeaders(HttpEngine.java:547)
12-07 15:28:53.396: W/System.err(4141):     at libcore.net.http.HttpEngine.readResponse(HttpEngine.java:787)
12-07 15:28:53.396: W/System.err(4141):     at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:274)
12-07 15:28:53.396: W/System.err(4141):     at libcore.net.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:168)
12-07 15:28:53.396: W/System.err(4141):     at io.socket.IOConnection.handshake(IOConnection.java:313)
12-07 15:28:53.396: W/System.err(4141):     ... 2 more

在浏览器中，我可以与 localhost:3000 连接，但在 Android 客户端中遇到问题。我还在应用程序中提供了我的系统 IP 地址。

请给我一些解决方案，请告诉我。

【问题讨论】：

SocketIO 不喜欢其他服务使用它，握手的错误意味着它意识到你没有使用SocketIO。如果你是那么这很有趣

标签： android node.js socket.io

【解决方案1】：

问题是您的客户端不支持 socket.io v1.0.x，而您在服务器端使用的是 socket.io v1.0。您应该降级服务器上的 socket.io 版本或更改您的库并使用另一个支持 v1 的库如果你使用的是 android studio，你可以使用this 但如果你使用的是 eclipse，我不知道有任何库支持 socket.io v1

【讨论】：