java通过蓝牙将字符串从PC作为客户端发送到移动服务器

Question

我需要通过蓝牙将字符串从PC传输到Android移动设备的帮助。Android移动设备应充当服务器，并在设备屏幕上显示字符串消息。作为客户端的PC应将字符串发送到移动设备

我希望服务器对提取的字符串做出反应（通过蓝牙传输）。这意味着，在一端，服务器必须始终侦听新字符串的到来，但在另一端，服务器仍必须能够对这些消息做出反应（例如，从一个菜单导航到另一个菜单）

我尝试使用BlueCove（2.1.1）作为BluetoothStack（我将BlueCove中的jar作为库添加到这两个项目中），并结合我发现的here服务器-客户机通信示例

更新：

由于使用服务器的RFComm连接，用户_CC从服务器更新了代码：

public class RFCommServer extends Thread{

//based on java.util.UUID
private static UUID MY_UUID = UUID.fromString("446118f0-8b1e-11e2-9e96-0800200c9a66");

// The local server socket
private BluetoothServerSocket mmServerSocket;

// based on 安卓.bluetooth.BluetoothAdapter
private BluetoothAdapter mAdapter;
private BluetoothDevice remoteDevice;

private Activity activity;

public RFCommServer(Activity activity) {
    this.activity = activity;
}

public void run() {
    BluetoothSocket socket = null;
    mAdapter = BluetoothAdapter.getDefaultAdapter();        

    // Listen to the server socket if we're not connected
    while (true) {

        try {
            // Create a new listening server socket
            Log.d(this.getName(), ".....Initializing RFCOMM SERVER....");

            // MY_UUID is the UUID you want to use for communication
            mmServerSocket = mAdapter.listenUsingRfcommWithServiceRecord("MyService", MY_UUID);
            //mmServerSocket = mAdapter.listenUsingInsecureRfcommWithServiceRecord(NAME, MY_UUID); // you can also try using In Secure connection...

            // This is a blocking call and will only return on a
            // successful connection or an exception
            socket = mmServerSocket.accept();

        } catch (Exception e) {

        }

        try {
            Log.d(this.getName(), "Closing Server Socket.....");
            mmServerSocket.close();

            InputStream tmpIn = null;
            OutputStream tmpOut = null;

            // Get the BluetoothSocket input and output streams

            tmpIn = socket.getInputStream();
            tmpOut = socket.getOutputStream();

            DataInputStream mmInStream = new DataInputStream(tmpIn);
            DataOutputStream mmOutStream = new DataOutputStream(tmpOut);

            // here you can use the Input Stream to take the string from the client whoever is connecting
            //similarly use the output stream to send the data to the client

            RelativeLayout layout = (RelativeLayout) activity.findViewById(R.id.relativeLayout_Layout);
            TextView text = (TextView) layout.findViewById(R.id.textView_Text);

            text.setText(mmInStream.toString());
        } catch (Exception e) {
            //catch your exception here
        }
    }
}

来自here的SPP客户端代码：

/**
* A simple SPP client that connects with an SPP server
*/
public class SampleSPPClient implements DiscoveryListener{

//object used for waiting
private static Object lock=new Object();

//vector containing the devices discovered
private static Vector vecDevices=new Vector();

private static String connectionURL=null;

public static void main(String[] args) throws IOException {

    SampleSPPClient client=new SampleSPPClient();

    //display local device address and name
    LocalDevice localDevice = LocalDevice.getLocalDevice();
    System.out.println("Address: "+localDevice.getBluetoothAddress());
    System.out.println("Name: "+localDevice.getFriendlyName());

    //find devices
    DiscoveryAgent agent = localDevice.getDiscoveryAgent();

    System.out.println("Starting device inquiry...");
    agent.startInquiry(DiscoveryAgent.GIAC, client);

    try {
        synchronized(lock){
            lock.wait();
        }
    }
    catch (InterruptedException e) {
        e.printStackTrace();
    }


    System.out.println("Device Inquiry Completed. ");

    //print all devices in vecDevices
    int deviceCount=vecDevices.size();

    if(deviceCount <= 0){
        System.out.println("No Devices Found .");
        System.exit(0);
    }
    else{
        //print bluetooth device addresses and names in the format [ No. address (name) ]
        System.out.println("Bluetooth Devices: ");
        for (int i = 0; i <deviceCount; i++) {
            RemoteDevice remoteDevice=(RemoteDevice)vecDevices.elementAt(i);
            System.out.println((i+1)+". "+remoteDevice.getBluetoothAddress()+" ("+remoteDevice.getFriendlyName(true)+")");
        }
    }

    System.out.print("Choose Device index: ");
    BufferedReader bReader=new BufferedReader(new InputStreamReader(System.in));

    String chosenIndex=bReader.readLine();
    int index=Integer.parseInt(chosenIndex.trim());

    //check for spp service
    RemoteDevice remoteDevice=(RemoteDevice)vecDevices.elementAt(index-1);
    UUID[] uuidSet = new UUID[1];
    uuidSet[0]=new UUID("446118f08b1e11e29e960800200c9a66", false);

    System.out.println("\nSearching for service...");
    agent.searchServices(null,uuidSet,remoteDevice,client);

    try {
        synchronized(lock){
            lock.wait();
        }
    }
    catch (InterruptedException e) {
        e.printStackTrace();
    }

    if(connectionURL==null){
        System.out.println("Device does not support Simple SPP Service.");
        System.exit(0);
    }

    //connect to the server and send a line of text
    StreamConnection streamConnection=(StreamConnection)Connector.open(connectionURL);

    //send string
    OutputStream outStream=streamConnection.openOutputStream();
    PrintWriter pWriter=new PrintWriter(new OutputStreamWriter(outStream));
    pWriter.write("Test String from SPP Client\r\n");
    pWriter.flush();


    //read response
    InputStream inStream=streamConnection.openInputStream();
    BufferedReader bReader2=new BufferedReader(new InputStreamReader(inStream));
    String lineRead=bReader2.readLine();
    System.out.println(lineRead);


}//main

//methods of DiscoveryListener
public void deviceDiscovered(RemoteDevice btDevice, DeviceClass cod) {
    //add the device to the vector
    if(!vecDevices.contains(btDevice)){
        vecDevices.addElement(btDevice);
    }
}

//implement this method since services are not being discovered
public void servicesDiscovered(int transID, ServiceRecord[] servRecord) {
    if(servRecord!=null && servRecord.length>0){
        connectionURL=servRecord[0].getConnectionURL(0,false);
    }
    synchronized(lock){
        lock.notify();
    }
}

//implement this method since services are not being discovered
public void serviceSearchCompleted(int transID, int respCode) {
    synchronized(lock){
        lock.notify();
    }
}


public void inquiryCompleted(int discType) {
    synchronized(lock){
        lock.notify();
    }

}//end method

}

为了进行测试，我使用了Galaxy Nexus（GT-I9250）和最新的Android API

多亏了user_CC，客户机和服务器现在可以正常运行。但遗憾的是，客户端无法连接到服务器（请参见下面的屏幕截图）。这是因为connectionURL从未设置过（因此默认情况下，它在这里跳if(connectionURL==null)）

如何更改客户机代码，以便将其连接到服务器？我需要一个适当的connectionURL在下面的行中：

StreamConnection streamConnection=(StreamConnection)Connector.open(connectionURL)

到目前为止，我只发现我需要以某种方式获得ServiceRecord，遗憾的是，在here的示例代码中也没有描述这一点

Answer 1

我不是Java开发人员，但我对Android版的Mono（c#）也有类似的问题

SPP的UUID应该是"00001101-0000-1000-8000-00805F9B34FB"
这是一个众所周知的标识蓝牙SPP适配器的UID

在我的c#代码中

private static UUID MY_UUID = UUID.FromString("00001101-0000-1000-8000-00805F9B34FB");

我猜您可以将Java代码更新为：

new UUID("00001101-0000-1000-8000-00805F9B34FB", true);

虽然我不确定该函数接受哪些参数，所以您可能需要检查一下

我用安卓设备作为客户端，但这些信息可能对你有用，
因此，我将在这里包含我最初从Java示例翻译的c#代码，
因此您应该能够将其翻译回：

btAdapter = BluetoothAdapter.DefaultAdapter;

btAdapter.CancelDiscovery(); //Always call CancelDiscovery before doing anything
remoteDevice = btAdapter.GetRemoteDevice(Settings["deviceaddress"].ToString());

socket = remoteDevice.CreateRfcommSocketToServiceRecord(MY_UUID);
socket.Connect();

基本上，我得到默认的适配器，取消任何正在运行的发现操作，然后 创建另一个设备的套接字。在你的情况下，你需要倾听而不是交流，只是为了获取信息

我希望它能有所帮助，很抱歉，我不能给您提供更多特定于Java的信息

“Update:”刚刚在Java中找到了一个或多或少遵循相同方法的小示例 正如我使用的：Problems with connecting bluetooth SPP in android?

Answer 2

您将需要使用RFComm API来进行通信。我已经设法定义了一个类，它是一个线程，将充当服务器并监听客户端连接。我还提出了一些意见供大家理解

    private class AcceptThread extends Thread {
    // The local server socket
    private BluetoothServerSocket mmServerSocket;

    public AcceptThread() {
    }

    public void run() {         
        BluetoothSocket socket = null;

                    BluetoothAdapter mAdapter = BluetoothAdapter.getDefaultAdapter();

        // Listen to the server socket if we're not connected
        while (true) {

            try {
                // Create a new listening server socket
                Log.d(TAG, ".....Initializing RFCOMM SERVER....");

                // MY_UUID is the UUID you want to use for communication
                mmServerSocket = mAdapter.listenUsingRfcommWithServiceRecord(NAME, MY_UUID);                    
                //mmServerSocket = mAdapter.listenUsingInsecureRfcommWithServiceRecord(NAME, MY_UUID);  you can also try using In Secure connection...

                // This is a blocking call and will only return on a
                // successful connection or an exception                    
                socket = mmServerSocket.accept();                   

            } catch (Exception e) {

            }

            try {
                Log.d(TAG, "Closing Server Socket.....";                    
                mmServerSocket.close();



                InputStream tmpIn = null;
                OutputStream tmpOut = null;

                // Get the BluetoothSocket input and output streams

                tmpIn = socket.getInputStream();
                tmpOut = socket.getOutputStream();


                mmInStream = new DataInputStream(tmpIn);
                mmOutStream = new DataOutputStream(tmpOut); 

                // here you can use the Input Stream to take the string from the client whoever is connecting
                //similarly use the output stream to send the data to the client
            } catch (Exception e) {
                //catch your exception here
            }

        }
    }

}

我希望这有帮助

关于你的另一个问题：

声明javax。蓝牙。客户端（PC）UUID类上的UUID应该来自javax。蓝牙。乌伊德

   uuidSet2[0] = new UUID("446118f08b1e11e29e960800200c9a66", false);

声明java。util。服务器端UUID（Android）

    UUID MY_UUID = UUID.fromString("446118f0-8b1e-11e2-9e96-0800200c9a66");