Question

当我将inLoop()方法放入while循环时，服务器永远不会运行。

它终止但我希望服务器不断地一次又一次地向客户端发送字节。

我该怎么做？

SimpleSPPServer -

public class SimpleSPPServer {
    //start server
    private 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=Sample SPP Server";


        //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();

        while(true)
        {
            inLoop(connection);
        }
    }

    public void inLoop(StreamConnection connection) throws IOException
    {
        RemoteDevice dev = RemoteDevice.getRemoteDevice(connection);
        System.out.println("Remote device address: "+dev.getBluetoothAddress());
        System.out.println("Remote device name: "+dev.getFriendlyName(true));

         //send response to spp client
         OutputStream outStream=connection.openDataOutputStream();

         DataOutputStream mmOutStream = new DataOutputStream(outStream); 

         byte[] bb1 = new byte[] {  
                 (byte)0x7D, (byte)0x43, (byte)0x92, (byte)0x05, (byte)0x0E, 
                 (byte)0x2E, (byte)0x0A };

         System.out.println("Writing Bytes...");

            try 
            {
                //mmOutStream.writeByte(bb[k]);
                mmOutStream.write(bb1, 0, bb1.length);

                Thread.sleep(5000);

                //mmOutStream.write(bb2, 0, bb2.length);
            } 
            catch (IOException e) 
            {
                e.printStackTrace();
            }
            catch (NullPointerException e) 
            {
            } catch (Exception e) {
                e.printStackTrace();
            }

        PrintWriter pWriter=new PrintWriter(new OutputStreamWriter(mmOutStream));
        try {
            mmOutStream.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }
        pWriter.flush();

        pWriter.close();

    }

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

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

        SimpleSPPServer sampleSPPServer=new SimpleSPPServer();
        sampleSPPServer.startServer();

    }

例外 -

Exception in thread "main" java.io.IOException: Stream cannot be reopened
    at com.intel.bluetooth.BluetoothRFCommConnection.openOutputStream(BluetoothRFCommConnection.java:190)
    at com.intel.bluetooth.BluetoothRFCommConnection.openDataOutputStream(BluetoothRFCommConnection.java:213)
    at SimpleSPPServer.inLoop(SimpleSPPServer.java:52)
    at SimpleSPPServer.startServer(SimpleSPPServer.java:41)
    at SimpleSPPServer.main(SimpleSPPServer.java:104)

Answer 1

从doLoop()开始关闭流。在使用while开始循环之前打开流。永远关闭流。或者当循环完成时。

在循环中写入OutputStream的字节时，不能重新打开流

1 个答案: