Java 如何持续监听来自android客户端的数据？

我正在尝试使用tcp套接字编程从android客户端到java服务器接收数据，但问题是它没有监听和接收数据。我希望连续接收数据。有人能帮忙吗

Android客户端：

package com.example.clientserver;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.Socket;

import android.support.v7.app.ActionBarActivity;
import android.app.Activity;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {

    private Button sendButton;
    private EditText messageText;
    private String messageToSend;
    private ClientSender clientSender;
    private Context context;
    private Socket socket;

    private static String SERVER_IP = "192.168.41.32";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        messageText = (EditText) findViewById(R.id.editText);
        sendButton = (Button) findViewById(R.id.send_button);
        context = this.getApplicationContext();
        clientSender = new ClientSender(context);
        socket = null;

        sendButton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                messageToSend = messageText.getText().toString()
                        + System.getProperty("line.separator");
                new ClientSender(context).execute(messageToSend);

            }
        });

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
     private class ClientSender extends AsyncTask<String, Void, Socket> {
            private Socket socket;
            private String answer;
            private Context context;
            private BufferedWriter out;
            private BufferedReader in;

            public ClientSender(Context context) {
                this.context = context;
                socket = null;
                out = null;
                in = null;
            }

            @Override
            protected Socket doInBackground(String... params) {
                try {
                    if (socket == null) {
                        socket = new Socket(SERVER_IP, 4000);

                        out = new BufferedWriter(
                                new OutputStreamWriter(socket.getOutputStream()));
                        in = new BufferedReader(
                                new InputStreamReader(socket.getInputStream()));
                    }

                    out.write(params[0]);
                    out.flush();

                    answer = in.readLine() + System.getProperty("line.separator");

                    return socket;
                } catch (IOException e) {
                    e.printStackTrace();
                }

                return socket;
            }

            protected void onPostExecute(Socket socket) {
                if (socket != null) {
                    Toast.makeText(context, answer, Toast.LENGTH_LONG).show();

                } else {
                    Toast.makeText(context, "Can't connect to server!",
                            Toast.LENGTH_LONG).show();
                }

            }

        }

}

服务器端：

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package javaapplication4;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author Mona
 */
public class Server extends javax.swing.JFrame {

    ServerSocket serverSocket;
    Socket socket;
    int port = 4000;

    /**
     * Creates new form Server
     */
    public Server() {
        initComponents();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jButton1 = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jButton1.setText("jButton1");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(169, Short.MAX_VALUE)
                .addComponent(jButton1)
                .addGap(158, 158, 158))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(140, Short.MAX_VALUE)
                .addComponent(jButton1)
                .addGap(137, 137, 137))
        );

        pack();
    }// </editor-fold>                        

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        try {
            // TODO add your handling code here:
            serverSocket = new ServerSocket(port);

                socket = serverSocket.accept();
                System.out.println("start Listening");
                BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                //InputStream stream = new BufferedInputStream(socket.getInputStream());
                String message = in.readLine();

              //  byte[] buffer = new byte[1024];
                //  int size = stream.read(buffer); // blockiert bis Nachricht empfangen
                // String data = new String(buffer, 0, size);
                System.out.println("strings" + message);
        } catch (IOException ex) {
            Logger.getLogger(Server.class.getName()).log(Level.SEVERE, null, ex);
        }
    }                                        

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;

                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Server.class
                    .getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Server.class
                    .getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Server.class
                    .getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Server.class
                    .getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Server().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JButton jButton1;
    // End of variables declaration                   
}

---

如何编写从客户端连续接收字符串数据的服务器。我已经写了代码，但它没有接收数据。我想服务器端接收数据时，从android发送按钮被点击。帮助任何人。

没有一个服务器程序不适合我使用android