public class SocketServer { private static Socket mSocket; public static void main(String[] argc) {  try {   //1.創建一個服務器端Socket，即ServerSocket，指定綁定的端口，并監聽此端口   ServerSocket serverSocket = new ServerSocket(12345);   InetAddress address = InetAddress.getLocalHost();   String ip = address.getHostAddress();   //2.調用accept()等待客戶端連接   System.out.println("~~~服務端已就緒，等待客戶端接入~，服務端ip地址: " + ip);   mSocket = serverSocket.accept();   //3.連接后獲取輸入流，讀取客戶端信息   InputStream is = null;   InputStreamReader isr = null;   BufferedReader br = null;   OutputStream os = null;   is = mSocket.getInputStream();   isr = new InputStreamReader(is, "UTF-8");   br = new BufferedReader(isr);   String info = null;   while ((info = br.readLine()) != null) {    System.out.println("客戶端發送過來的信息" + info);    if (info.equals(BackService.HEART_BEAT_STRING)) {     sendmsg("ok");    } else {     sendmsg("服務器發送過來的信息" + info);    }   }   mSocket.shutdownInput();   mSocket.close();  } catch (IOException e) {   e.printStackTrace();  }} //為連接上服務端的每個客戶端發送信息 public static void sendmsg(String msg) {  PrintWriter pout = null;  try {   pout = new PrintWriter(new BufferedWriter(    new OutputStreamWriter(mSocket.getOutputStream(), "UTF-8")), true);   pout.println(msg);  } catch (IOException e) {   e.printStackTrace();  } }}

package com.example.dell.aidlservice;// Declare any non-default types here with import statementsinterface IBackService { /**  * Demonstrates some basic types that you can use as parameters  * and return values in AIDL.  */ boolean sendMessage(String message);}

public class BackService extends Service { private static final String TAG = "danxx"; public static final String HEART_BEAT_STRING = "HeartBeat";//心跳包內容 /**  * 心跳頻率  */ private static final long HEART_BEAT_RATE = 3 * 1000; /**  * 服務器ip地址  */ public static final String HOST = "172.16.50.115"; /**  * 服務器端口號  */ public static final int PORT = 12345; /**  * 服務器消息回復廣播  */ public static final String MESSAGE_ACTION = "message_ACTION"; /**  * 服務器心跳回復廣播  */ public static final String HEART_BEAT_ACTION = "heart_beat_ACTION"; /**  * 讀線程  */ private ReadThread mReadThread; private LocalBroadcastManager mLocalBroadcastManager; /***/ private WeakReference<Socket> mSocket; // For heart Beat private Handler mHandler = new Handler(); /**  * 心跳任務，不斷重復調用自己  */ private Runnable heartBeatRunnable = new Runnable() {  @Override  public void run() {   if (System.currentTimeMillis() - sendTime >= HEART_BEAT_RATE) {    boolean isSuccess = sendMsg(HEART_BEAT_STRING);//就發送一個/r/n過去 如果發送失敗，就重新初始化一個socket    if (!isSuccess) {     mHandler.removeCallbacks(heartBeatRunnable);     mReadThread.release();     releaseLastSocket(mSocket);     new InitSocketThread().start();    }   }   mHandler.postDelayed(this, HEART_BEAT_RATE);  } }; private long sendTime = 0L; /**  * aidl通訊回調  */ private IBackService.Stub iBackService = new IBackService.Stub() {  /**   * 收到內容發送消息   * @param message 需要發送到服務器的消息   * @return   * @throws RemoteException   */  @Override  public boolean sendMessage(String message) throws RemoteException {   return sendMsg(message);  } }; @Override public IBinder onBind(Intent arg0) {  return iBackService; } @Override public void onCreate() {  super.onCreate();  new InitSocketThread().start();  mLocalBroadcastManager = LocalBroadcastManager.getInstance(this); } public boolean sendMsg(final String msg) {  if (null == mSocket || null == mSocket.get()) {   return false;  }  final Socket soc = mSocket.get();  if (!soc.isClosed() && !soc.isOutputShutdown()) {   new Thread(new Runnable() {    @Override    public void run() {     try {      OutputStream os = soc.getOutputStream();      String message = msg + "/r/n";      os.write(message.getBytes());      os.flush();     } catch (IOException e) {      e.printStackTrace();     }    }   }).start();   sendTime = System.currentTimeMillis();//每次發送成數據，就改一下最后成功發送的時間，節省心跳間隔時間  } else {   return false;  }  return true; } private void initSocket() {//初始化Socket  try {   //1.創建客戶端Socket，指定服務器地址和端口   Socket so = new Socket(HOST, PORT);   mSocket = new WeakReference<Socket>(so);   mReadThread = new ReadThread(so);   mReadThread.start();   mHandler.postDelayed(heartBeatRunnable, HEART_BEAT_RATE);//初始化成功后，就準備發送心跳包  } catch (UnknownHostException e) {   e.printStackTrace();  } catch (IOException e) {   e.printStackTrace();  } } /**  * 心跳機制判斷出socket已經斷開后，就銷毀連接方便重新創建連接  *  * @param mSocket  */ private void releaseLastSocket(WeakReference<Socket> mSocket) {  try {   if (null != mSocket) {    Socket sk = mSocket.get();    if (!sk.isClosed()) {     sk.close();    }    sk = null;    mSocket = null;   }  } catch (IOException e) {   e.printStackTrace();  } } class InitSocketThread extends Thread {  @Override  public void run() {   super.run();   initSocket();  } } // Thread to read content from Socket class ReadThread extends Thread {  private WeakReference<Socket> mWeakSocket;  private boolean isStart = true;  public ReadThread(Socket socket) {   mWeakSocket = new WeakReference<Socket>(socket);  }  public void release() {   isStart = false;   releaseLastSocket(mWeakSocket);  }  @Override  public void run() {   super.run();   Socket socket = mWeakSocket.get();   if (null != socket) {    try {     InputStream is = socket.getInputStream();     byte[] buffer = new byte[1024 * 4];     int length = 0;     while (!socket.isClosed() && !socket.isInputShutdown() && isStart && ((length = is.read(buffer)) != -1)) {      if (length > 0) {       String message = new String(Arrays.copyOf(buffer, length)).trim();       Log.e(TAG, message);       //收到服務器過來的消息，就通過Broadcast發送出去       if (message.equals("ok")) {//處理心跳回復        Intent intent = new Intent(HEART_BEAT_ACTION);        mLocalBroadcastManager.sendBroadcast(intent);       } else {        //其他消息回復        Intent intent = new Intent(MESSAGE_ACTION);        intent.putExtra("message", message);        mLocalBroadcastManager.sendBroadcast(intent);       }      }     }    } catch (IOException e) {     e.printStackTrace();    }   }  } } @Override public void onDestroy() {  super.onDestroy();  mHandler.removeCallbacks(heartBeatRunnable);  mReadThread.release();  releaseLastSocket(mSocket); }}

public class MainActivity extends AppCompatActivity implements View.OnClickListener { private TextView mResultText; private EditText mEditText; private Intent mServiceIntent; private IBackService iBackService; private ServiceConnection conn = new ServiceConnection() {  @Override  public void onServiceDisconnected(ComponentName name) {   iBackService = null;  }  @Override  public void onServiceConnected(ComponentName name, IBinder service) {   iBackService = IBackService.Stub.asInterface(service);  } }; class MessageBackReciver extends BroadcastReceiver {  private WeakReference<TextView> textView;  public MessageBackReciver(TextView tv) {   textView = new WeakReference<TextView>(tv);  }  @Override  public void onReceive(Context context, Intent intent) {   String action = intent.getAction();   TextView tv = textView.get();   if (action.equals(BackService.HEART_BEAT_ACTION)) {    if (null != tv) {     Log.i("danxx", "Get a heart heat");     tv.setText("Get a heart heat");    }   } else {    Log.i("danxx", "Get a heart heat");    String message = intent.getStringExtra("message");    tv.setText("服務器消息:" + message);   }  } } private MessageBackReciver mReciver; private IntentFilter mIntentFilter; private LocalBroadcastManager mLocalBroadcastManager; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  mLocalBroadcastManager = LocalBroadcastManager.getInstance(this);  mResultText = (TextView) findViewById(R.id.resule_text);  mEditText = (EditText) findViewById(R.id.content_edit);  findViewById(R.id.send).setOnClickListener(this);  findViewById(R.id.send1).setOnClickListener(this);  mReciver = new MessageBackReciver(mResultText);  mServiceIntent = new Intent(this, BackService.class);  mIntentFilter = new IntentFilter();  mIntentFilter.addAction(BackService.HEART_BEAT_ACTION);  mIntentFilter.addAction(BackService.MESSAGE_ACTION); } @Override protected void onStart() {  super.onStart();  mLocalBroadcastManager.registerReceiver(mReciver, mIntentFilter);  bindService(mServiceIntent, conn, BIND_AUTO_CREATE); } @Override protected void onStop() {  super.onStop();  unbindService(conn);  mLocalBroadcastManager.unregisterReceiver(mReciver); } public void onClick(View view) {  switch (view.getId()) {   case R.id.send:    String content = mEditText.getText().toString();    try {     boolean isSend = iBackService.sendMessage(content);//Send Content by socket     Toast.makeText(this, isSend ? "success" : "fail", Toast.LENGTH_SHORT).show();     mEditText.setText("");    } catch (RemoteException e) {     e.printStackTrace();    }    break;   case R.id.send1:    new Thread(new Runnable() {     @Override     public void run() {      try {       acceptServer();      } catch (IOException e) {       e.printStackTrace();      }     }    }).start();    break;   default:    break;  } } private void acceptServer() throws IOException {  //1.創建客戶端Socket，指定服務器地址和端口  Socket socket = new Socket("172.16.50.115", 12345);  //2.獲取輸出流，向服務器端發送信息  OutputStream os = socket.getOutputStream();  PrintWriter printWriter = new PrintWriter(os); //將輸出流包裝為打印流  //獲取客戶端的IP地址  InetAddress address = InetAddress.getLocalHost();  String ip = address.getHostAddress();  printWriter.write("客戶端：~" + ip + "~ 接入服務器！！");  printWriter.flush();  socket.shutdownInput();  socket.close(); }}