以下代码未在服务器和客户端之间建立连接?通过蓝牙? [英] Connection was not made between server and client in following code? via bluetooth?

问题描述

package bluetooth;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import javax.bluetooth.*;
import javax.microedition.io.*;

public class SampleSPPServer
{
  //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";
    System.out.println(connectionString);
    //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));
    //read string from spp client
    InputStream inStream=connection.openInputStream();
    BufferedReader bReader=new BufferedReader(new InputStreamReader(inStream));
    String lineRead=bReader.readLine();
    System.out.println(lineRead);

    //send response to spp client
    OutputStream outStream=connection.openOutputStream();
    PrintWriter pWriter=new PrintWriter(new OutputStreamWriter(outStream));
    pWriter.write("Response String from SPP Server\r\n");
    pWriter.flush();
    pWriter.close();
    streamConnNotifier.close();
  }

  public static void main(String[] args) throws IOException
  {
    //display local device address and nam
    LocalDevice localDevice = LocalDevice.getLocalDevice();
    System.out.println("Address: " + localDevice.getBluetoothAddress());
    System.out.println("Name: " + localDevice.getFriendlyName());
    SampleSPPServer sampleSPPServer=new SampleSPPServer();
    sampleSPPServer.startServer();
  }
}

................................................... ......................
客户:

........................................................................
Client:

package bluetooth;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.Vector;
import javax.bluetooth.DeviceClass;
import javax.bluetooth.DiscoveryAgent;
import javax.bluetooth.DiscoveryListener;
import javax.bluetooth.LocalDevice;
import javax.bluetooth.RemoteDevice;
import javax.bluetooth.ServiceRecord;
import javax.bluetooth.UUID;
import javax.microedition.io.Connector;
import javax.microedition.io.StreamConnection;

/**  21.
 * A simple SPP client that connects with an SPP server  22.
 */

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("1101",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
}

推荐答案

，如果您仔细查看代码，则必须安装SPP:串行端口协议服务，您会注意到您的UUID:1101是SPP ID，因此，当您将蓝牙设备中的新设备从属性添加到活动的SPP服务(即FTP文件传输协议)时，可以从客户端获取文件.

您不仅可以激活服务，还可以激活btspp协议，其中包含许多服务
看看这个UUID:

you have to avtivate your SPP : serial port protocol service if you look to the code more carefully you will notice that your UUID :1101 that is a SPP ID , so when you add a new device in your bluetooth shoose from the properites to active SPP service which is FTP file transfet protocol , then you can get a file from the client

you can active more than services the btspp protocol have many services
look at this UUID :

private static final UUID[] searchUuidSet = new UUID[] {
//      new UUID(0x0001),   // SDP
//      new UUID(0x0003),   // RFCOMM
//      new UUID(0x0008),   // OBEX
//      new UUID(0x000C),   // HTTP
        new UUID(0x0100)    // L2CAP
//      new UUID(0x000F),   // BNEP
//      new UUID(0x1101),   // Serial Port ///  ssp   taba3naaa  ..
//      new UUID(0x1000),   // ServiceDiscoveryServerServiceClassID
//      new UUID(0x1001),   // BrowseGroupDescriptorServiceClassID
//      new UUID(0x1002),   // PublicBrowseGroup
//      new UUID(0x1105),   // OBEX Oject Push
//      new UUID(0x1106),   // OBEX File Transfer
//      new UUID(0x1115),   // PAN
//      new UUID(0x1116),   // Network Access Point
//      new UUID(0x1117),   // Group Network



String url = servRecord[i].getConnectionURL(ServiceRecord.NOAUTHENTICATE_NOENCRYPT,
false);

//Later, after service discovery is complete, I attempt to connect like this:

Connection connection = Connector.open(url);

不要再添加该网址，如果您忘记了该网址，则该网址将为null，并且spp服务将无法激活

don''t foget to add the url , if you forget it , it will be null and the spp service will not activate

这篇关于以下代码未在服务器和客户端之间建立连接?通过蓝牙?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！