java.net.socket ConnectException ETIMEEDOUT

Question

我正在尝试使用android连接服务器套接字。 请检查下面的代码。 我正在尝试将数据从android发送到服务器以及将数据从服务器发送回android，但这在android端导致timeout exception 。

package com.example.orderdish;

import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintStream;
import java.net.Socket;
import java.net.UnknownHostException;

import android.app.Activity;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MenuActivity extends Activity {

    Button vegButton, nonVegButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_menu);

        vegButton = (Button) findViewById(R.id.btn_veg);
        nonVegButton = (Button) findViewById(R.id.btn_non_veg);
    }

    public void openCategory(View view) {
        Button button = (Button)view;
        Toast.makeText(getApplicationContext(), button.getText().toString() + " selected", Toast.LENGTH_LONG).show();
        //Intent intent = new Intent(getApplicationContext(), ListCategoryActivity.class);
        //startActivity(intent);
         MyClientTask myClientTask = new MyClientTask(
                   "my ip",
                   1234);
                 myClientTask.execute();
    }

     public class MyClientTask extends AsyncTask<Void, Void, String> {

          String dstAddress;
          int dstPort;
          String response = "";
          DataOutputStream dataOutputStream = null;
          DataInputStream dataInputStream = null;
          MyClientTask(String addr, int port){
           dstAddress = addr;
           dstPort = port;
          }

          @Override
          protected String doInBackground(Void... arg0) {

           Socket socket = null;

           try {
               Timer timer = new Timer(3000);
               timer.start();
               //Connect to remote host
               socket = new Socket(dstAddress, dstPort);
               Log.v("MenuActivity: ", "Connected to 1234 port");

               //Reset timer - timeout can occur on connect
           // InputStream inputStream = socket.getInputStream();
               //create data output stream for writing
               PrintStream pout = new PrintStream(socket.getOutputStream());
              //dataOutputStream = new DataOutputStream(socket.getOutputStream());


           // dataOutputStream.writeUTF("v");

               //create data input stream for reading
               DataInputStream din = new DataInputStream(socket.getInputStream());

               //Print hello message
               pout.println("Hello world");

               //Reset timer - timeout is likely to occur during the read
               timer.reset();

               //print message from server

          //  dataInputStream = new DataInputStream(socket.getInputStream());
         //   response = dataInputStream.readUTF();
         //   Log.v("MenuActivity", "hi.." + dataInputStream.readUTF());
            ByteArrayOutputStream byteArrayOutputStream = 
                          new ByteArrayOutputStream(1024);
            byte[] buffer = new byte[1024];

            int bytesRead;


            /*
             * notice:
             * inputStream.read() will block if no data return
             */
                     while ((bytesRead = din.read(buffer)) != -1){
                         byteArrayOutputStream.write(buffer, 0, bytesRead);
                         response += byteArrayOutputStream.toString("UTF-8");
                     }
                     Log.v("MenuActivity ", response);

                     timer.stop();
           } catch (UnknownHostException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            response = "UnknownHostException: " + e.toString();
           } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            response = "IOException: " + e.toString();
           }finally{
            if(socket != null){
             try {
              socket.close();
             } catch (IOException e) {
              // TODO Auto-generated catch block
              e.printStackTrace();
             }
            }
           }
           return response;
          }

          @Override
          protected void onPostExecute(String result) {
         //  textResponse.setText(response);
            Log.v("MenuActivity", result);
           super.onPostExecute(result);
          }

         }

}



package com.orderdish.main;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.List;

import com.google.gson.Gson;



public class Test {
//  List<Menu> menuList;
    public static void main(String args[])  {

            ServerSocket serverSocket = null;
            Socket socket = null;
            String str;
            List<Menu> menuList;


            try {
                serverSocket = new ServerSocket(1234);
                socket = serverSocket.accept();
                System.out.println("Server has connected!\n");
                socket.setSoTimeout(100000);

                BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));


                while ((str = br.readLine()) != null) {
                    System.out.println("The message: " + str.trim());
                }


                PrintWriter out = new PrintWriter(socket.getOutputStream(), true);


                System.out.println("Sending string ... sample data\n");
                out.println("sample data");

                out.close();
                br.close();
                socket.close();
                serverSocket.close();

            } catch(Exception e) {
            System.out.println("Whoops! It didn't work!\n : " + e.getMessage().toString());
            }
    }
}

Answer 1

**Please find the modified code**

package com.example.orderdish;

import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintStream;
import java.net.Socket;
import java.net.UnknownHostException;

import org.json.JSONArray;
import org.json.JSONException;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;


public class MenuActivity extends Activity {

     int current = 0;
     Context ctx;
     Button vegButton, nonVegButton;
     String ip = "XXX.XXX.X.XX";           //Server IP
     int portNo = 1234;                    //Port no.

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


      ctx = getApplicationContext();

        vegButton = (Button) findViewById(R.id.btn_veg);
        nonVegButton = (Button) findViewById(R.id.btn_non_veg);



        vegButton.setOnClickListener(buttonConnectOnClickListener);
        nonVegButton.setOnClickListener(buttonConnectOnClickListener);

     }

     OnClickListener buttonConnectOnClickListener = 
       new OnClickListener(){

        @Override
        public void onClick(View view) {

         MyClientTask myClientTask = new MyClientTask(
           ip, portNo);
         myClientTask.execute();
        }};

     public class MyClientTask extends AsyncTask<Void, Void, String> {

      String dstAddress;
      int dstPort;
      String menuType;
      String response = "";
      String received_message;
      MyClientTask(String addr, int port){
       dstAddress = addr;                            //server ip
       dstPort = port;                               //server port
      }

      @Override
      protected String doInBackground(Void... arg0) {

       Socket socket = null;

       try {
        socket = new Socket(dstAddress, dstPort);

        DataOutputStream pout = new DataOutputStream(socket.getOutputStream());
        pout.writeUTF(menuType);

        DataInputStream dis = new DataInputStream(socket.getInputStream());
         received_message = DataInputStream.readUTF(dis);

          pout.close(); 


       } catch (UnknownHostException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        response = "UnknownHostException: " + e.toString();
       } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        response = "IOException: " + e.toString();
       } finally{
        if(socket != null){
         try {
          socket.close();
         } catch (IOException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
         }
        }
       }
       return received_message;
      }

      @Override
      protected void onPostExecute(String result) {
       super.onPostExecute(result);
      }
     }
}


package com.orderdish.main;


import java.io.DataInputStream;
import java.io.DataOutputStream;

import java.io.IOException;

import java.net.ServerSocket;
import java.net.Socket;
import java.util.List;


public class Test {
    public final static int SOCKET_PORT = 1234; 

    public static DataInputStream dis;
    public static DataOutputStream dos;



    public static void main(String args[]) throws IOException {


        ServerSocket serverSocket = null;
        Socket socket = null;

        try {
            serverSocket = new ServerSocket(SOCKET_PORT);
            while(true) {
                System.out.println("Waiting...");
                try {
                    socket = serverSocket.accept();
                    System.out.println("Accepted connection: " + socket);

                    //Here is the change
                    dis = new DataInputStream(socket.getInputStream());
                    String received_message = DataInputStream.readUTF(dis);

                    dos = new DataOutputStream(socket.getOutputStream());
                    dos.writeUTF("sample data");

                } catch(Exception e) {
                  System.out.println("Whoops! It didn't work!\n");
                } finally {
                    if(dis != null) dis.close();
                    if(dos != null) dos.close();                    
                    if(socket != null)
                        socket.close();
                }
            } 
        } finally {
            if(serverSocket != null) serverSocket.close();
        }
    }

}