我在一个需要多个客户端（Android）连接到服务器（PC）蓝牙的项目中。客户端需要向服务器发送多个字符串。我正在使用RFCOMM在客户端和服务器之间建立连接。我设法将字符串从客户端发送到服务器。我去过Google，发现关于我的问题的参考很少，我读到可以在服务器中使用不同的UUID，但仍然不知道该怎么做。
这是我的服务器程序：
public class ServerText {
//start server
void startServer() throws IOException{
//Create a UUID for SPP
UUID uuid = new UUID("1101", true);
//Create the servicve url
String connectionString = "btspp://localhost:" + uuid +";name=Server Bluetooth 2";
//open server url
StreamConnectionNotifier streamConnNotifier = (StreamConnectionNotifier)Connector.open( connectionString );
//Wait for client connection
System.out.println("\nServer Started. Waiting for clients to connect...");
StreamConnection connection=streamConnNotifier.acceptAndOpen();
RemoteDevice dev = RemoteDevice.getRemoteDevice(connection);
System.out.println("Remote device address: "+dev.getBluetoothAddress());
System.out.println("Remote device name: "+dev.getFriendlyName(true));
InputStream inStream=connection.openInputStream();
BufferedReader bReader=new BufferedReader(new InputStreamReader(inStream));
String lineRead=bReader.readLine();
System.out.println(lineRead);
streamConnNotifier.close();
inStream.close();
bReader.close();
}
public static void main(String[] args) throws IOException, SQLException{
//display local device address and name
LocalDevice localDevice = LocalDevice.getLocalDevice();
System.out.println("Address: "+localDevice.getBluetoothAddress());
System.out.println("Name: "+localDevice.getFriendlyName());
ServerText serverbluetooth2=new ServerText();
serverbluetooth2.startServer();
}
}
这是我的客户程序：
public class Bluetooth extends AppCompatActivity {
//TextView out;
private static final int REQUEST_ENABLE_BT = 1;
private BluetoothAdapter btAdapter = null;
private BluetoothSocket btSocket = null;
private OutputStream outStream = null;
// Well known SPP UUID
private static final UUID MY_UUID =
UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
//MAC address DC85DEF66492
private static String address = "DC:85:DE:F6:64:92";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bluetooth);
// out = (TextView) findViewById(R.id.out);
// out.append("\n...In onCreate()...");
btAdapter = BluetoothAdapter.getDefaultAdapter();
CheckBTState();
}
@Override
public void onStart() {
super.onStart();
//out.append("\n...In onStart()...");
}
@Override
public void onResume() {
super.onResume();
//out.append("\n...In onResume...\n...Attempting client connect...");
// Set up a pointer to the remote node using it's address.
BluetoothDevice device = btAdapter.getRemoteDevice(address);
try {
btSocket = device.createRfcommSocketToServiceRecord(MY_UUID);
} catch (IOException e) {
AlertBox("Fatal Error", "In onResume() and socket create failed: " + e.getMessage() + ".");
}
// Discovery is resource intensive. Make sure it isn't going on
// when you attempt to connect and pass your message.
btAdapter.cancelDiscovery();
// Establish the connection. This will block until it connects.
try {
btSocket.connect();
// out.append("\n...Connection established and data link opened...");
} catch (IOException e) {
try {
btSocket.close();
} catch (IOException e2) {
AlertBox("Fatal Error", "In onResume() and unable to close socket during connection failure" + e2.getMessage() + ".");
}
}
// Create a data stream so we can talk to server.
//out.append("\n...Sending message to server...");
try {
outStream = btSocket.getOutputStream();
} catch (IOException e) {
AlertBox("Fatal Error", "In onResume() and output stream creation failed:" + e.getMessage() + ".");
}
Intent intent = getIntent();
String message = intent.getExtras().getString("pindah");
byte[] msgBuffer = message.getBytes();
if(btSocket.isConnected()) {
try {
outStream.write(msgBuffer);
if (outStream != null) {
try {
outStream.flush();
} catch (IOException e) {
AlertBox("Fatal Error", "In onResume() and failed to flush output stream: " + e.getMessage() + ".");
}
}
try {
btSocket.close();
} catch (IOException e2) {
AlertBox("Fatal Error", "In onResume() and failed to close socket." + e2.getMessage() + ".");
}
} catch (IOException e) {
String msg = "In onResume() and an exception occurred during write: " + e.getMessage();
if (address.equals("00:00:00:00:00:00"))
msg = msg + ".\n\nUpdate your server address from 00:00:00:00:00:00 to the correct address on line 37 in the java code";
msg = msg + ".\n\nCheck that the SPP UUID: " + MY_UUID.toString() + " exists on server.\n\n";
AlertBox("Fatal Error", msg);
}
}
}
@Override
public void onPause() {
super.onPause();
//out.append("\n...In onPause()...");
//if (outStream != null) {
// try {
// outStream.flush();
//} catch (IOException e) {
// AlertBox("Fatal Error", "In onPause() and failed to flush output stream: " + e.getMessage() + ".");
//}
//}
//try {
// btSocket.close();
//} catch (IOException e2) {
// AlertBox("Fatal Error", "In onPause() and failed to close socket." + e2.getMessage() + ".");
//}
}
@Override
public void onStop() {
super.onStop();
//out.append("\n...In onStop()...");
}
@Override
public void onDestroy() {
super.onDestroy();
//out.append("\n...In onDestroy()...");
}
private void CheckBTState() {
// Check for Bluetooth support and then check to make sure it is turned on
// Emulator doesn't support Bluetooth and will return null
if(btAdapter==null) {
AlertBox("Fatal Error", "Bluetooth Not supported. Aborting.");
} else {
if (btAdapter.isEnabled()) {
//out.append("\n...Bluetooth is enabled...");
} else {
//Prompt user to turn on Bluetooth
Intent enableBtIntent = new Intent(btAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
}
}
}
public void AlertBox( String title, String message ){
new AlertDialog.Builder(this)
.setTitle( title )
.setMessage( message + " Press OK to exit." )
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
finish();
}
}).show();
}
}