为了好玩，我尝试编写一个可以写入手机端口并从同一端口读取的应用程序。我创建了两个套接字，并为另一个创建了一个编写器和一个读者。我只是希望读者告诉我它收到了作者的消息，但我无法让它发挥作用。我的方法有明显的缺陷吗？ 作者只需每5秒写一次当前时间。
package com.example.service1;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.URL;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
import android.app.Service;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Handler;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;
public class MyService extends Service {
public static final String TAG = "com.example.service1.MyService";
Socket mSocket;
Socket mSocket2;
ServerSocket mServerSocket;
BufferedWriter mBufWriter;
BufferedReader mBufReader;
Handler mHandler;
Timer mTimer;
@Override
public IBinder onBind(Intent arg0) {
return null;
}
@Override
public void onCreate() {
Toast.makeText(this, "MyService Created", Toast.LENGTH_LONG).show();
Log.d(TAG, "onCreate");
try {
new CreateSocketTask().execute();
if(mTimer != null) {
mTimer.cancel();
} else {
mTimer = new Timer();
}
mHandler = new Handler();
mTimer.scheduleAtFixedRate(new TimeDisplayTimerTask(), 1000, 5000);
new ListenSocketTask().execute();
} catch (Exception e) {
e.printStackTrace();
}
}
private class ListenSocketTask extends AsyncTask<URL, Integer, Long> {
protected Long doInBackground(URL... urls) {
try {
while (true) {
Log.d(TAG, "Listening!");
if (mSocket2!=null && mBufReader!=null) {
while (mSocket2.isConnected()) {
Log.d(TAG, "Listening and not null!");
final String msg = mBufReader.readLine();
Log.d(TAG, msg);
}
}
}
} catch (Exception e) {
Log.d(TAG, "Exception while listening!");
}
return 0L;
}
protected void onProgressUpdate(Integer... progress) {
//setProgressPercent(progress[0]);
}
protected void onPostExecute(Long result) {
//showDialog("Downloaded " + result + " bytes");
}
}
class TimeDisplayTimerTask extends TimerTask {
@Override
public void run() {
mHandler.post(new Runnable() {
@Override
public void run() {
try {
Toast.makeText(getApplicationContext(), mServerSocket.getLocalPort() + " " + getDateTime(), Toast.LENGTH_SHORT).show();
mBufWriter.write(getDateTime() + "\n");
mBufWriter.flush();
Log.d(TAG, "Flushed writer");
} catch (Exception e) {
Log.d(TAG, "Exception in timer task");
}
}
});
}
private String getDateTime() {
// get date time in custom format
SimpleDateFormat sdf = new SimpleDateFormat("[yyyy/MM/dd - HH:mm:ss]");
return sdf.format(new Date());
}
}
private class CreateSocketTask extends AsyncTask<URL, Integer, Long> {
protected Long doInBackground(URL... urls) {
try {
// InetAddress serverAddr = InetAddress.getByName("localhost");
// mSocket = new Socket("localhost", 4444);
mServerSocket = new ServerSocket(34107);
mSocket = new Socket(InetAddress.getByName("localhost"), 34107);
mSocket2 = new Socket(InetAddress.getByName("localhost"), 34107);
mBufWriter = new BufferedWriter(new PrintWriter(mSocket.getOutputStream()));
mBufReader = new BufferedReader(new InputStreamReader(mSocket2.getInputStream()));
// Toast.makeText(MyService.this, "Port: " + mServerSocket.getLocalPort(), Toast.LENGTH_LONG).show();
return (long)(mServerSocket.getLocalPort());
} catch (Exception e) {
e.printStackTrace();
}
return 0L;
}
protected void onProgressUpdate(Integer... progress) {
//setProgressPercent(progress[0]);
}
protected void onPostExecute(Long result) {
//showDialog("Downloaded " + result + " bytes");
}
}
@Override
public void onStart(Intent intent, int startId) {
Toast.makeText(this, "MyService Started", Toast.LENGTH_LONG).show();
Log.d(TAG, "onStart");
}
@Override
public void onDestroy() {
Toast.makeText(this, "MyService Stopped", Toast.LENGTH_LONG).show();
Log.d(TAG, "onDestroy");
try {
mServerSocket.close();
mSocket.close();
mSocket2.close();
mBufWriter.close();
mBufReader.close();
} catch (Exception e) {
}
}
}
日志产生以下内容：
02-18 16:54:13.142: D/libEGL(28003): loaded /system/lib/egl/libEGL_mali.so
02-18 16:54:13.192: D/libEGL(28003): loaded /system/lib/egl/libGLESv1_CM_mali.so
02-18 16:54:13.202: D/libEGL(28003): loaded /system/lib/egl/libGLESv2_mali.so
02-18 16:54:13.302: D/OpenGLRenderer(28003): Enabling debug mode 0
02-18 16:54:17.246: D/com.example.service1.MyService(28003): onCreate
02-18 16:54:17.266: D/com.example.service1.MyService(28003): onStart
02-18 16:54:17.326: D/com.example.service1.MyService(28003): Listening!
02-18 16:54:17.326: D/com.example.service1.MyService(28003): Listening and not null!
02-18 16:54:17.406: D/dalvikvm(28003): GC_CONCURRENT freed 146K, 10% free 9568K/10567K, paused 28ms+5ms, total 115ms
02-18 16:54:18.297: D/com.example.service1.MyService(28003): Flushed writer
02-18 16:54:23.272: D/com.example.service1.MyService(28003): Flushed writer
02-18 16:54:28.266: D/com.example.service1.MyService(28003): Flushed writer
02-18 16:54:33.271: D/com.example.service1.MyService(28003): Flushed writer