java实现和手机蓝牙连接

要实现 Java 和手机蓝牙的连接，可以使用 Java 的蓝牙 API 和 Android 的蓝牙 API。具体步骤如下：

1. 在 Android 应用程序中，打开蓝牙。

BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (!mBluetoothAdapter.isEnabled()) {
    Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
    startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
}

2. 扫描蓝牙设备。

private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (BluetoothDevice.ACTION_FOUND.equals(action)) {
            BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
            mDeviceListAdapter.addDevice(device);
            mDeviceListAdapter.notifyDataSetChanged();
        }
    }
};

3. 连接蓝牙设备。

private BluetoothSocket createBluetoothSocket(BluetoothDevice device) throws IOException {
    if (Build.VERSION.SDK_INT >= 10) {
        try {
            final Method m = device.getClass().getMethod("createInsecureRfcommSocketToServiceRecord", new Class[] { UUID.class });
            return (BluetoothSocket) m.invoke(device, MY_UUID);
        } catch (Exception e) {
            Log.e(TAG, "Could not create Insecure RFComm Connection", e);
        }
    }
    return device.createRfcommSocketToServiceRecord(MY_UUID);
}

BluetoothSocket socket = device.createRfcommSocketToServiceRecord(SERIAL_PORT_SERVICE_CLASS_UUID);
socket.connect();

4. 通过输入输出流发送和接收数据。

InputStream inputStream = socket.getInputStream();
OutputStream outputStream = socket.getOutputStream();
outputStream.write(data);
byte[] buffer = new byte[1024];
int length = inputStream.read(buffer);

以上是简单的步骤，具体实现需要根据具体情况进行调整和完善。