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蓝牙#xff0c;是一种支持设备短距离通信#xff08;一般10m内#xff09;的无线电技术#xff0c;能在包括移动电话、PDA、无线耳机、笔记本电脑、相关外设等众多设备之间#xff0c;通过蓝牙设备之间的无线通信实现数据传输#xff0c;实现数据传输#xf…
蓝牙概述
蓝牙是一种支持设备短距离通信一般10m内的无线电技术能在包括移动电话、PDA、无线耳机、笔记本电脑、相关外设等众多设备之间通过蓝牙设备之间的无线通信实现数据传输实现数据传输音频传输文件传输图片传输等多种应用的无线信息交换。利用“蓝牙”技术能够有效地简化移动通信终端设备之间的通信也能够成功地简化设备与因特网Internet之间的通信从而数据传输变得更加迅速高效为无线通信拓宽道路。蓝牙技术是一种无线数据和语音通信开放的全球规范它是基于低成本的近距离无线连接为固定和移动设备建立通信环境的一种特殊的近距离无线技术连接。目前越来越多的企业采用蓝牙交互技术来实现自己的产品。
Java实现蓝牙交互的优势
Java是世界上最流行的编程语言之一。Java具有平台无关性、对象化编程、简单易用、可扩展性等特点因此目前已广泛应用于企业和互联网领域。Java还提供了很好的蓝牙接口可以帮助企业快速开发蓝牙交互应用。Java的蓝牙接口是基于JSR-82标准实现的这个标准允许JAVA应用程序访问蓝牙网络的API。与其他大多数蓝牙接口不同JSR-82可以在任意实现了JSR-82标准的蓝牙设备间进行通讯这就保证了兼容性和灵活性。
蓝牙通信的原理
蓝牙技术规定每一对设备之间进行蓝牙通讯时必须一个为主角色另一为从角色才能进行通信通信时必须由主端进行查找发起配对建链成功后双方即可收发数据。
蓝牙主端设备发起呼叫首先是查找找出周围处于可被查找的蓝牙设备。主端设备找到从端蓝牙设备后与从端蓝牙设备进行配对此时需要输入从端设备的PIN码也有设备不需要输入PIN码。
配对完成后从端蓝牙设备会记录主端设备的信任信息此时主端即可向从端设备发起呼叫已配对的设备在下次呼叫时不再需要重新配对。
Java蓝牙交互应用实例
导包
dependencygroupIdnet.sf.bluecove/groupIdartifactIdbluecove/artifactIdversion2.1.0/version
/dependency
BluetoothServer
public class BluetoothServer implements Runnable {//本机蓝牙设备private LocalDevice local null;// 流连接private StreamConnection streamConnection null;// 输入流private InputStream inputStream;private OutputStream outputStream;//接入通知private StreamConnectionNotifier notifier;//线程池private final static ExecutorService service Executors.newCachedThreadPool();public String serverName;public String serverUUID;private OnServerListener mServerListener;public interface OnServerListener {void onConnected(InputStream inputStream, OutputStream outputStream);void onDisconnected();void onClose();}public BluetoothServer(String serverUUID, String serverName) {this.serverUUID serverUUID;this.serverName serverName;}public void start() {try {local LocalDevice.getLocalDevice();if (!local.setDiscoverable(DiscoveryAgent.GIAC)) {System.out.println(请将蓝牙设置为可被发现);}/*** 作为服务端被请求 ;nameserverName;*/String url btspp://localhost: serverUUID;notifier (StreamConnectionNotifier) Connector.open(url);service.submit(this);} catch (IOException e) {System.out.println(e.getMessage());;}}public OnServerListener getServerListener() {return mServerListener;}public void setServerListener(OnServerListener mServerListener) {this.mServerListener mServerListener;}Overridepublic void run() {try {//阻塞的等待设备连接streamConnection notifier.acceptAndOpen(); inputStream streamConnection.openInputStream();outputStream streamConnection.openOutputStream();if (mServerListener ! null) {mServerListener.onConnected(inputStream, outputStream);}} catch (IOException e) {e.printStackTrace();} catch (Exception e) {e.printStackTrace();} finally {}}
}
BluetoothClient
public class BluetoothClient {private StreamConnection streamConnection;private OnDiscoverListener onDiscoverListener null;private OnClientListener onClientListener null;public interface OnClientListener {void onConnected(InputStream inputStream, OutputStream outputStream);void onConnectionFailed();void onDisconnected();void onClose();}public interface OnDiscoverListener {void onDiscover(RemoteDevice remoteDevice);}public BluetoothClient() {}public OnDiscoverListener getOnDiscoverListener() {return onDiscoverListener;}public void setOnDiscoverListener(OnDiscoverListener onDiscoverListener) {this.onDiscoverListener onDiscoverListener;}public OnClientListener getClientListener() {return onClientListener;}public void setClientListener(OnClientListener onClientListener) {this.onClientListener onClientListener;}public void find() throws IOException, InterruptedException {//附近所有的蓝牙设备必须先执行 runDiscoverySetRemoteDevice devicesDiscovered RemoteDeviceDiscovery.getDevices(); IteratorRemoteDevice itr devicesDiscovered.iterator();//连接while (itr.hasNext()) { RemoteDevice remoteDevice itr.next();onDiscoverListener.onDiscover(remoteDevice);}}public void startClient(RemoteDevice remoteDevice, String serviceUUID) throws IOException, InterruptedException {String url RemoteDeviceDiscovery.searchService(remoteDevice, serviceUUID);streamConnection (StreamConnection) Connector.open(url);if (this.onClientListener ! null) {this.onClientListener.onConnected(streamConnection.openInputStream(), streamConnection.openOutputStream());}}
}
RemoteDeviceDiscovery
public class RemoteDeviceDiscovery {public final static SetRemoteDevice devicesDiscovered new HashSetRemoteDevice();public final static VectorString serviceFound new VectorString();final static Object serviceSearchCompletedEvent new Object();final static Object inquiryCompletedEvent new Object();private static DiscoveryListener listener new DiscoveryListener() {public void inquiryCompleted(int discType) {System.out.println(# 搜索完成);synchronized (inquiryCompletedEvent) {inquiryCompletedEvent.notifyAll();}}Overridepublic void deviceDiscovered(RemoteDevice remoteDevice, DeviceClass deviceClass) {devicesDiscovered.add(remoteDevice);try {System.out.println(#发现设备 remoteDevice.getFriendlyName(false));} catch (IOException e) {e.printStackTrace();}}Overridepublic void servicesDiscovered(int transID, ServiceRecord[] servRecord) {for (int i 0; i servRecord.length; i) {String url servRecord[i].getConnectionURL(ServiceRecord.NOAUTHENTICATE_NOENCRYPT, false);if (url null) {continue;}serviceFound.add(url);DataElement serviceName servRecord[i].getAttributeValue(0x0100);if (serviceName ! null) {System.out.println(service serviceName.getValue() found url);} else {System.out.println(service found url);}}System.out.println(# servicesDiscovered);}Overridepublic void serviceSearchCompleted(int arg0, int arg1) {System.out.println(# serviceSearchCompleted);synchronized(serviceSearchCompletedEvent){serviceSearchCompletedEvent.notifyAll();}}};private static void findDevices() throws IOException, InterruptedException {devicesDiscovered.clear();synchronized (inquiryCompletedEvent) {LocalDevice ld LocalDevice.getLocalDevice();System.out.println(#本机蓝牙名称: ld.getFriendlyName());boolean started LocalDevice.getLocalDevice().getDiscoveryAgent().startInquiry(DiscoveryAgent.GIAC,listener);if (started) {System.out.println(# 等待搜索完成...);inquiryCompletedEvent.wait();LocalDevice.getLocalDevice().getDiscoveryAgent().cancelInquiry(listener);System.out.println(#发现设备数量 devicesDiscovered.size());}}}public static SetRemoteDevice getDevices() throws IOException, InterruptedException {findDevices();return devicesDiscovered;}public static String searchService(RemoteDevice btDevice, String serviceUUID) throws IOException, InterruptedException {UUID[] searchUuidSet new UUID[] { new UUID(serviceUUID, false) };int[] attrIDs new int[] {// Service name0x0100 };synchronized(serviceSearchCompletedEvent) {System.out.println(search services on btDevice.getBluetoothAddress() btDevice.getFriendlyName(false));LocalDevice.getLocalDevice().getDiscoveryAgent().searchServices(attrIDs, searchUuidSet, btDevice, listener);serviceSearchCompletedEvent.wait();}if (serviceFound.size() 0) {return serviceFound.elementAt(0);} else {return ;}}
}
测试
Bluetooth Server
Test
public void test(){final String serverName Bluetooth Server Test;final String serverUUID 1000110100001000800000805F9B34FB; //根据需要自定义BluetoothServer server new BluetoothServer(serverUUID, serverName);server.setServerListener(new BluetoothServer.OnServerListener() {Overridepublic void onConnected(InputStream inputStream, OutputStream outputStream) {System.out.printf(Connected);//添加通信代码}Overridepublic void onDisconnected() {}Overridepublic void onClose() {}});server.start();
}
测试结果
Connected to the target VM, address: 127.0.0.1:8442, transport: socket
Native Library intelbth_x64 not available
Native Library bluecove_x64 not available
BlueCove libraries not available
Disconnected from the target VM, address: 127.0.0.1:8442, transport: socket
没有找到_64的包。
看看导包的版本 下载_64版本
官网BlueCove - BlueCove JSR-82 project
下载地址https://sourceforge.net/projects/bluecove/files/
ps下面自己测试吧。
JNIJava Native Interface主要是通过读取其他底层语言的文件转换成Java的类操作设备。
另外还有连接打印机、pos机等也是使用Java的JNI调用其他底层语言的文件如打印机使用jacob读取dll文件、可实现无接触操作语音智能打印等。
