Java - 蓝牙 API Bluecove 问题

Question

我在使用 Java 中的 Bluecove API 时遇到问题。我计划创建一个基本的 BT 监听器，以便从自制设备(Arduino 供电)接收一些数据。我有以下很容易理解的代码:

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 Bluetooth
{
    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=Magic Merlin 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();

    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
    {
    LocalDevice localDevice = LocalDevice.getLocalDevice();
    System.out.println("Address: "+localDevice.getBluetoothAddress());
    System.out.println("Name: "+localDevice.getFriendlyName());

    Bluetooth sampleSPPServer = new Bluetooth();
    sampleSPPServer.startServer();
    }
}

当我尝试执行我的代码时，出现了这个奇怪的错误:

Exception in thread "main" javax.bluetooth.BluetoothStateException: BlueCove com.intel.bluetooth.BluetoothStackBlueZ not available
at com.intel.bluetooth.BlueCoveImpl.loadStackClass(BlueCoveImpl.java:342)
at com.intel.bluetooth.BlueCoveImpl.detectStack(BlueCoveImpl.java:427)
at com.intel.bluetooth.BlueCoveImpl.access$500(BlueCoveImpl.java:65)
at com.intel.bluetooth.BlueCoveImpl$1.run(BlueCoveImpl.java:1020)
at java.security.AccessController.doPrivileged(Native Method)
at com.intel.bluetooth.BlueCoveImpl.detectStackPrivileged(BlueCoveImpl.java:1018)
at com.intel.bluetooth.BlueCoveImpl.getBluetoothStack(BlueCoveImpl.java:1011)
at javax.bluetooth.LocalDevice.getLocalDeviceInstance(LocalDevice.java:75)
at javax.bluetooth.LocalDevice.getLocalDevice(LocalDevice.java:95)
at Bluetooth.main(Bluetooth.java:50)

第 50 行是 LocalDevice localDevice = LocalDevice.getLocalDevice();。

我的计算机上有一个启用的 BT 加密狗，所以我对此非常失望。如果您对如何解决这个问题有任何想法，那就太好了!

无论如何感谢您阅读本主题。问候。

Answer 1

如果这是在 Linux 上，您可以检查两件事:

• 你的类路径中有 net.sf.bluecove:bluecove-gpl:2.1.0 吗？参见 this了解更多信息。
• 你有安装libbluetooth-dev包吗？不过，这可能是 Xubuntu 特有的。这个包里有 BlueZ，输入 apt-cache show libbluetooth-dev 查看说明。其他 Linux 发行版可能有等效的库

希望这对您有所帮助。