Android通過Bluetooth藍牙發送手機照片文件到Windows PC：Java實現

本文在《Android通過藍牙發送數據到Windows PC電腦：Java實現（鏈接地址：https://blog.csdn.net/zhangphil/article/details/83146705 ）》基礎上改進代碼，還是用Java實現把Android手機上的一張照片，通過Bluetooth藍牙連接，發送到Windows PC電腦上，實現上仍區分為Windows電腦端的藍牙服務器端BluetoothJavaServer：

import java.io.BufferedInputStream; import java.io.FileOutputStream;import javax.microedition.io.Connector; import javax.microedition.io.StreamConnection; import javax.microedition.io.StreamConnectionNotifier;/*** BluetoothJavaServer是藍牙的服務器端。部署在Windows操作系統（PC電腦上）。 等待手機客戶端或者其他藍牙設備的連接。* * @author fly**/ public class BluetoothJavaServer {// 藍牙服務器端的UUID必須和手機端的UUID一致。// 手機端的UUID需要去掉中間的-分割符。private String MY_UUID = "0000110100001000800000805F9B34FB";public static void main(String[] args) {new BluetoothJavaServer();}public BluetoothJavaServer() {StreamConnectionNotifier mStreamConnectionNotifier = null;try {mStreamConnectionNotifier = (StreamConnectionNotifier) Connector.open("btspp://localhost:" + MY_UUID);} catch (Exception e) {e.printStackTrace();}try {System.out.println("服務器端開始監聽客戶端連接請求...");while (true) {StreamConnection connection = mStreamConnectionNotifier.acceptAndOpen();System.out.println("接受客戶端連接");new ClientThread(connection).start();}} catch (Exception e) {e.printStackTrace();}}/*** 開啟一個線程專門從與客戶端藍牙設備中讀取文件數據，并把文件數據存儲到本地。* * @author fly**/private class ClientThread extends Thread {private StreamConnection mStreamConnection = null;public ClientThread(StreamConnection sc) {mStreamConnection = sc;}@Overridepublic void run() {try {BufferedInputStream bis = new BufferedInputStream(mStreamConnection.openInputStream());// 本地創建一個image.jpg文件接收來自于手機客戶端發來的圖片文件數據。FileOutputStream fos = new FileOutputStream("image.jpg");int c = 0;byte[] buffer = new byte[1024];System.out.println("開始讀數據...");while (true) {c = bis.read(buffer);if (c == -1) {System.out.println("讀取數據結束");break;} else {fos.write(buffer, 0, c);}}fos.flush();fos.close();bis.close();mStreamConnection.close();} catch (Exception e) {e.printStackTrace();}}} }

Android手機端的藍牙客戶端BluetoothClientActivity：

package zhangphil.test;import java.io.BufferedOutputStream; import java.io.File; import java.io.FileInputStream; import java.util.Set; import java.util.UUID;import android.bluetooth.BluetoothAdapter; import android.bluetooth.BluetoothDevice; import android.bluetooth.BluetoothSocket; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.os.Bundle; import android.os.Environment; import android.support.v7.app.AppCompatActivity; import android.text.TextUtils; import android.util.Log;public class BluetoothClientActivity extends AppCompatActivity {private BluetoothAdapter mBluetoothAdapter;//要連接的目標藍牙設備（Windows PC電腦的名字）。private final String TARGET_DEVICE_NAME = "PHIL-PC";private final String TAG = "藍牙調試";//UUID必須是Android藍牙客戶端和Windows PC電腦端一致。private final String MY_UUID = "00001101-0000-1000-8000-00805F9B34FB";// 通過廣播接收系統發送出來的藍牙設備發現通知。private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {String action = intent.getAction();if (BluetoothDevice.ACTION_FOUND.equals(action)) {BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);String name = device.getName();if (name != null)Log.d(TAG, "發現藍牙設備:" + name);if (name != null && name.equals("PHIL-PC")) {Log.d(TAG, "發現目標藍牙設備，開始線程連接");new Thread(new ClientThread(device)).start();// 藍牙搜索是非常消耗系統資源開銷的過程，一旦發現了目標感興趣的設備，可以關閉掃描。mBluetoothAdapter.cancelDiscovery();}}}};/*** 該線程往藍牙服務器端發送文件數據。*/private class ClientThread extends Thread {private BluetoothDevice device;public ClientThread(BluetoothDevice device) {this.device = device;}@Overridepublic void run() {BluetoothSocket socket;try {socket = device.createRfcommSocketToServiceRecord(UUID.fromString(MY_UUID));Log.d(TAG, "連接藍牙服務端...");socket.connect();Log.d(TAG, "連接建立.");// 開始往服務器端發送數據。Log.d(TAG, "開始往藍牙服務器發送數據...");sendDataToServer(socket);} catch (Exception e) {e.printStackTrace();}}private void sendDataToServer(BluetoothSocket socket) {try {FileInputStream fis = new FileInputStream(getFile());BufferedOutputStream bos = new BufferedOutputStream(socket.getOutputStream());byte[] buffer = new byte[1024];int c;while (true) {c = fis.read(buffer);if (c == -1) {Log.d(TAG, "讀取結束");break;} else {bos.write(buffer, 0, c);}}bos.flush();fis.close();bos.close();Log.d(TAG, "發送文件成功");} catch (Exception e) {e.printStackTrace();}}}/*** 發給給藍牙服務器的文件。* 本例發送一張位于存儲器根目錄下名為 image.jpg 的照片。** @return*/private File getFile() {File root = Environment.getExternalStorageDirectory();File file = new File(root, "image.jpg");return file;}/*** 獲得和當前Android藍牙已經配對的藍牙設備。** @return*/private BluetoothDevice getPairedDevices() {Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();if (pairedDevices != null && pairedDevices.size() > 0) {for (BluetoothDevice device : pairedDevices) {// 把已經取得配對的藍牙設備名字和地址打印出來。Log.d(TAG, device.getName() + " : " + device.getAddress());//如果已經發現目標藍牙設備和Android藍牙已經配對，則直接返回。if (TextUtils.equals(TARGET_DEVICE_NAME, device.getName())) {Log.d(TAG, "已配對目標設備 -> " + TARGET_DEVICE_NAME);return device;}}}return null;}@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();BluetoothDevice device = getPairedDevices();if (device == null) {// 注冊廣播接收器。// 接收系統發送的藍牙發現通知事件。IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);registerReceiver(mBroadcastReceiver, filter);if (mBluetoothAdapter.startDiscovery()) {Log.d(TAG, "搜索藍牙設備...");}} else {new ClientThread(device).start();}}@Overrideprotected void onDestroy() {super.onDestroy();unregisterReceiver(mBroadcastReceiver);} }

本例出于簡單演示功能的目的，省去了Android客戶端選擇文件的代碼實現，事先作為測試文件，先在Android手機的存儲器根目錄放置一張名為image.jpg的圖片。
務必保證Windows電腦和Android手機上的藍牙均處于打開狀態。然后先啟動服務器端程序，再啟動Android手機客戶端程序。
Windows電腦端輸出：

Android studio的logcat輸出：

總結

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