插座io android java客户端接收消息和发送文件示例

Question

有人有任何示例代码来演示在java客户端接收消息socket.io?

还有，有没有从同一个套接字发送文件/二进制文件/图片的例子。io java客户端？（基本上是来自java而非javascript客户端的示例代码）

android java client的版本可以在这里获得（该版本声称它可以与socket.io 1.0及更高版本一起使用）（似乎是最新的版本）https://github.com/nkzawa/socket.io-client.java

目前的示例代码只允许我初始化连接，服务器能够获取我的传入连接事件和java套接字。io客户端能够发送基本的发射消息。然而，关于如何从服务器广播或从另一个网站用户发出的消息更新，没有简单的例子。

示例代码仅供参考：

package com.sample.d10132014a;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URISyntaxException;

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

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;

import com.github.nkzawa.socketio.client.*; // java socket io client
import com.github.nkzawa.socketio.client.Socket;
import com.github.nkzawa.emitter.Emitter;
import com.github.nkzawa.engineio.client.*; // java engine io client
import com.github.nkzawa.engineio.client.transports.*;


public class MainActivity extends Activity {

    public static String internalPath; // internal storage path
    public static String fileName; // the file name
    private Socket socket; // socket object
    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        try 
        {
            socket = IO.socket("http://YOURSERVERIP:3000");
            socket.connect();  // initiate connection to socket server
            socket.emit("chat message",  "From Android to server: 1st outgoing message");
        } 
        catch (URISyntaxException e) 
        {
            e.printStackTrace();
        }


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

          @Override
          public void call(Object... args) {
              Log.d("socketio", "socket connected");
              socket.emit("chat message", "even connect: message sent from android to socketio server");
              //socket.disconnect(); // why is there a disconnect here?
          }
      }).on("chat message", new Emitter.Listener() {

        @Override
        public void call(Object... arg0) {
            // TODO Auto-generated method stub
            JSONObject obj = (JSONObject)arg0[0];
            Log.d("socketio", "message back: "+obj.toString());
            Log.d("socketio", "incomming chat message: " + obj.toString() + arg0 + arg0[0] + arg0[1]); // trying to test which variable holds the message
        }
        }).on(Socket.EVENT_MESSAGE, new Emitter.Listener() {

            @Override
            public void call(Object... arg0) {
                // TODO Auto-generated method stub
                Log.d("socketio", "socket event message" + arg0);
                socket.emit("chat message", "android to server from event message");
            }
        });




      // 2nd segment test without connecting to 1 long method
      socket.on(Socket.EVENT_CONNECT_ERROR, new Emitter.Listener() 
      {
        @Override
        public void call(Object... arg0) {
            // TODO Auto-generated method stub
            Log.d("socketio", "socket event connect error");
            socket.emit("chat message",  "android to server: socket event connect error");
        }
      });

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

        @Override
        public void call(Object... arg0) {
            // TODO Auto-generated method stub
            Log.d("socketio", "socket event message" + arg0);
            socket.emit("chat message", "android to server from event message");
        }
    });
    setContentView(R.layout.activity_main);


    } // ending onCreate method

} // ending class

谢谢你的阅读

Answer 1

经过多次尝试，以下代码对我有效：

IO.Options opts = new IO.Options();
opts.transports = new String[]{"websocket"};
Socket socket = IO.socket(SERVER_NAME, opts);

socket.on("MY MESSAGE", args -> runOnUiThread(() -> {
    Log.d("Received Message", ((JSONObject) args[0]).toString());
    JSONObject json = new JSONObject();
    
    try {
        json.put("author", "Android");
        json.put("message", "Hello!");
        socket.emit("SERVER SEND", json);
    } catch(Exception e) {
        Log.d("ERROR", e.getMessage());
    }
}));

socket.connect();

特别感谢这个回答：https://stackoverflow.com/a/31187321/6909832

Answer 2

Hi希望以下实现有所帮助。下面是管理器类，它跟踪所有事件注册。传递回调，创建连接等。

public class  NetworkManager {
    private static NetworkManager mInstance;
    private Socket mSocket;
    private int RECONNECTION_ATTEMPT = 10;
    private long CONNECTION_TIMEOUT = 30000;
    private static NetworkInterface mNetworkInterface;

    public static NetworkManager getInstance(Context context, NetworkInterface interfaces) {
        mNetworkInterface = interfaces;
        if (mInstance == null) {
            mInstance = new NetworkManager();
        }
        return mInstance;
    }

    /**
     * The purpose of this method to create the socket object
     */
    public void connectToSocket() {
        try {
            IO.Options opts = new IO.Options();
            opts.timeout = CONNECTION_TIMEOUT;
            opts.reconnection = true;
            opts.reconnectionAttempts = RECONNECTION_ATTEMPT;
            opts.reconnectionDelay = 1000;
            opts.forceNew = true;
            mSocket = IO.socket(NetworkConstant.SOCKET_CONNECTION_URL, opts);
           /*mSocket = IO.socket(NetworkConstant.SOCKET_CONNECTION_URL);
            mSocket.io().timeout(CONNECTION_TIMEOUT);
            mSocket.io().reconnection(true);
            mSocket.io().reconnectionAttempts(RECONNECTION_ATTEMPT);*/
            makeConnection();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * The purpose of the method is to return the instance of socket
     *
     * @return
     */
    public Socket getSocket() {
        return mSocket;
    }

    /**
     * The purpose of this method is to connect with the socket
     */

    public void makeConnection() {
        if (mSocket != null) {
            mSocket.connect();
            if (mSocket.connected())
                registerConnectionAttributes();
        }
    }

    /**
     * The purpose of this method is to disconnect from the socket interface
     */
    public void disconnectFromSocket() {
        unregisterConnectionAttributes();
        mSocket.disconnect();
        mSocket = null;
        mInstance = null;
    }

    public void registerConnectionAttributes() {
        try {
            if(mSocket.connected()) {
                mSocket.on(Socket.EVENT_CONNECT_ERROR, onConnectionError);
                mSocket.on(Socket.EVENT_CONNECT_TIMEOUT, onConnectionTimeOut);
                mSocket.on(Socket.EVENT_DISCONNECT, onServerDisconnect);
            }} catch (Exception e) {
            e.printStackTrace();
        }

    }

    public void unregisterConnectionAttributes() {
        try {
            mSocket.off(Socket.EVENT_CONNECT_ERROR, onConnectionError);
            mSocket.off(Socket.EVENT_CONNECT_TIMEOUT, onConnectionTimeOut);
            mSocket.off(Socket.EVENT_DISCONNECT, onServerDisconnect);
        } catch (Exception e)
        {
            e.printStackTrace();
        }
    }

    /**
     * The purpose of this method is to get the call back for any type of connection error
     */
    private Emitter.Listener onConnectionError = new Emitter.Listener() {
        @Override
        public void call(Object... args) {
            Logger.error("Response", "onConnectionError");
            mNetworkInterface.networkCallReceive(NetworkConstant.SERVER_CONNECTION_ERROR);
        }
    };

    /**
     * The purpose of this method to get the call back for connection getting timed out
     */
    private Emitter.Listener onConnectionTimeOut = new Emitter.Listener() {
        @Override
        public void call(Object... args) {
            Logger.error("Response", "onConnectionTimeOut");
            mNetworkInterface.networkCallReceive(NetworkConstant.SERVER_CONNECTION_TIMEOUT);
        }
    };
    /**
     * The purpose of this method is to receive the call back when the server get disconnected
     */
    private Emitter.Listener onServerDisconnect = new Emitter.Listener() {
        @Override
        public void call(Object... args) {
            Logger.error("Response", "onServerDisconnection");
            mNetworkInterface.networkCallReceive(NetworkConstant.SERVER_DISCONNECTED);
        }
    };

    /**
     * The purpose of this method is register a method on server
     *
     * @param methodOnServer
     * @param handlerName
     */
    public void registerHandler(String methodOnServer, Emitter.Listener handlerName) {
        try {
            if(mSocket.connected())
            mSocket.on(methodOnServer, handlerName);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * The purpose of this method is to unregister a method from server
     *
     * @param methodOnServer
     * @param handlerName
     */
    public void unRegisterHandler(String methodOnServer, Emitter.Listener handlerName) {
        try {
            mSocket.off(methodOnServer, handlerName);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * The purpose of this method is to send the data to the server
     *
     * @param methodOnServer
     * @param request
     */
    public void sendDataToServer(String methodOnServer, JSONObject request) {
        Logger.error("JSON ", request.toString());
        try {
            if(mSocket.connected())

            {
                mSocket.emit(methodOnServer, request);
            }
            else
                {
                    mNetworkInterface.networkCallReceive(NetworkConstant.SERVER_CONNECTION_ERROR);
                }
            } catch (Exception e) {
            e.printStackTrace();
        }

    }

    public interface NetworkInterface {
        public void networkCallReceive(int responseType);
    }

}

Answer 3

为什么我不确定这是否正是你想要的，也许你已经解决了它，不管我想回答它，因为当我在浏览我的问题的解决方案时，我在这里遇到了你的问题，但我找不到任何答案，让我失望。由于我已经解决了我的问题，我想分享一下我是如何做到的。

我的问题是我正在接收来自节点的消息。js服务器，但我只能在我的logcat中看到这条消息，我在主UI线程的android应用程序上打印这条消息时遇到了一个问题。

比方说，我们将在列表视图中显示从服务器收到的消息。

try {
        socket = IO.socket("http://192.168.1.10:3000");
    } catch (URISyntaxException e) {
        e.printStackTrace();
    }

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

        @Override
        public void call(Object... args) {
            Log.d("ActivityName: ", "socket connected");

            // emit anything you want here to the server
            socket.emit("login", some);
            //socket.disconnect();
        }

   // this is the emit from the server
    }).on("someFunction", new Emitter.Listener() {

        @Override
        public void call(Object... args) {
            // this argas[0] can have any type you send from the server
            JSONArray obj = (JSONArray) args[0];
              String message = obj.toString();

            // runOnUiThread is needed if you want to change something in the UI thread
            runOnUiThread(new Runnable() {
                public void run() {
                    // do something
                    //mListData is the array adapter
                        mListData.add("Serversays" + " : " + " " + message);
                        mListData.notifyDataSetChanged();
                        lvList.setSelection(mListData.getCount() -1);
                }
            });
        }
    }).on(Socket.EVENT_DISCONNECT, new Emitter.Listener() {

        @Override
        public void call(Object... args) {
            Log.d("ActivityName: ", "socket disconnected");
        }

    });
    socket.connect();

我们只能从主线程更新视图。您必须将后台任务中更新ui的部分移动到主线程上。所以我们必须添加以下内容，并在其中完成我们所需的任务。

runOnUiThread(new Runnable(){

                    @Override
                    public void run() {
//do something
}
}

希望它能为某人节省时间。