Question

您好我想使用套接字发送消息我有这个：

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

import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends Activity {

    TextView textResponse;
    EditText editTextAddress, editTextPort;
    Button buttonConnect, buttonClear;

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

        editTextAddress = (EditText)findViewById(R.id.address);
        editTextPort = (EditText)findViewById(R.id.port);
        buttonConnect = (Button)findViewById(R.id.connect);
        buttonClear = (Button)findViewById(R.id.clear);
        textResponse = (TextView)findViewById(R.id.response);

        buttonConnect.setOnClickListener(buttonConnectOnClickListener);

        buttonClear.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View v) {
                textResponse.setText("");
            }});
    }

    OnClickListener buttonConnectOnClickListener =
            new OnClickListener(){

                @Override
                public void onClick(View arg0) {
                    MyClientTask myClientTask = new MyClientTask(
                            editTextAddress.getText().toString(),
                            Integer.parseInt(editTextPort.getText().toString()));
                    myClientTask.execute();
                }};

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

        String dstAddress;
        int dstPort;
        String response = "";

        MyClientTask(String addr, int port){
            dstAddress = addr;
            dstPort = port;
        }

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

            Socket socket = null;

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

                ByteArrayOutputStream byteArrayOutputStream =
                        new ByteArrayOutputStream(1024);
                byte[] buffer = new byte[1024];

                DataOutputStream outputStream = new DataOutputStream(socket.getOutputStream());
                outputStream.writeUTF("Hello World!");

                // Read data
//                DataInputStream inputStream = new DataInputStream(socket.getInputStream());
//                message = inputStream.readUTF();

                // Shut down socket


                int bytesRead;
                InputStream inputStream = socket.getInputStream();

                while ((bytesRead = inputStream.read(buffer)) != -1){
                    byteArrayOutputStream.write(buffer, 0, bytesRead);
                    response += byteArrayOutputStream.toString("UTF-8");
                }
                OutputStream out = socket.getOutputStream();

                out.write("some data".getBytes());
                out.flush();
                socket.shutdownInput();
                socket.shutdownOutput();
                socket.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 null;
        }

        @Override
        protected void onPostExecute(Void result) {
            textResponse.setText(response);
            super.onPostExecute(result);
        }

    }

}

当我单击仅连接到服务器的按钮时。它不发送消息。发送什么东西需要做什么？也许是一个消息“Hello world”？

Answer 1

我不确定你的程序的重点是什么，但你的输出和输入系统看起来相当混乱。您需要DataOutputStream来发送数据，DataInputStream需要从套接字接收数据。

我已经使用了更简单的系统：

try {
        // Establish connection
        Socket socket = new Socket("IP ADDRESS HERE", PORT_NUMBER);

        // Request data
        DataOutputStream outputStream = new DataOutputStream(socket.getOutputStream());
        outputStream.writeUTF("Hello World!");

        // Read data
        DataInputStream inputStream = new DataInputStream(socket.getInputStream());
        message = inputStream.readUTF();

        // Shut down socket
        socket.shutdownInput();
        socket.shutdownOutput();
        socket.close();
    } catch (IOException io) {
        io.printStackTrace();
    }

注意：您可以根据需要将readUTF更改为readByte或其他几种替代方案。

Java android使用socket发送消息

1 个答案: