基于usb4java的usb通讯

下载java API及lib库地址：http://usb4java.org/index.html

1、导入所需要的库：

2、添加配置文件：文件名：javax.usb.properties；内容：javax.usb.services = org.usb4java.javax.Services

目录结构如下：

3、具体代码实现如下：

 package com.test.usb;

 import java.util.List;

 import javax.usb.UsbConfiguration;
 import javax.usb.UsbDevice;
 import javax.usb.UsbDeviceDescriptor;
 import javax.usb.UsbEndpoint;
 import javax.usb.UsbHostManager;
 import javax.usb.UsbHub;
 import javax.usb.UsbInterface;
 import javax.usb.UsbPipe;

 public class UsbUtil {
     private static short idVendor = (short)0x8888;
     private static short idProduct = (short)0x0006;

     public static void main(String[] args) {
         try {
             UsbPipe sendUsbPipe = new UsbUtil().useUsb();

             if (sendUsbPipe != null) {
                 byte[] buff = new byte[64];
                 for (int i = 0; i < 9; i++) {
                     buff[i] = (byte)i;
                     sendMassge(sendUsbPipe, buff);
                 }
             }

         } catch (Exception e) {
             e.printStackTrace();
         }
     }

     public UsbPipe useUsb() throws Exception{
         UsbInterface iface = linkDevice();
         if (iface == null) {
             return null;
         }
         UsbEndpoint receivedUsbEndpoint,sendUsbEndpoint;

         sendUsbEndpoint = (UsbEndpoint)iface.getUsbEndpoints().get(0);
         if (!sendUsbEndpoint.getUsbEndpointDescriptor().toString().contains("OUT")) {
             receivedUsbEndpoint = sendUsbEndpoint;
             sendUsbEndpoint = (UsbEndpoint)iface.getUsbEndpoints().get(1);
         } else {
             receivedUsbEndpoint = (UsbEndpoint)iface.getUsbEndpoints().get(1);
         }

         //发送：
         UsbPipe sendUsbPipe =  sendUsbEndpoint.getUsbPipe();
         sendUsbPipe.open();

         //接收
         final UsbPipe receivedUsbPipe =  receivedUsbEndpoint.getUsbPipe();
         receivedUsbPipe.open();

         new Thread(new Runnable() {
             public void run() {
                 try {
                     receivedMassge(receivedUsbPipe);
                 } catch (Exception e) {
                     e.printStackTrace();
                 }
             }
         }).start();
         return sendUsbPipe;
     }

     public UsbInterface linkDevice() throws Exception{

         UsbDevice device = null;
         if (device == null) {
              device = findDevice(UsbHostManager.getUsbServices()
                         .getRootUsbHub());
         }
         if (device == null) {
             System.out.println("设备未找到！");
             return null;
         }
         UsbConfiguration configuration = device.getActiveUsbConfiguration();
         UsbInterface iface = null;
         if (configuration.getUsbInterfaces().size() > 0) {
             iface = (UsbInterface)configuration.getUsbInterfaces().get(0);
         } else {
             return null;
         }
         iface.claim();
         return iface;
     }

     public void receivedMassge(UsbPipe usbPipe) throws Exception{
         byte[] b = new byte[64];
         int length = 0;
         while (true) {
             length = usbPipe.syncSubmit(b);//阻塞
             System.out.println("接收长度：" + length);
             for (int i = 0; i < length; i++) {
                 System.out.print(Byte.toUnsignedInt(b[i])+" ");
             }
         }
     }

     public static void sendMassge(UsbPipe usbPipe,byte[] buff)  throws Exception{
         usbPipe.syncSubmit(buff);//阻塞
         //usbPipe.asyncSubmit(buff);//非阻塞
     }

     public UsbDevice findDevice(UsbHub hub)
     {
         UsbDevice device = null;
         List list = (List) hub.getAttachedUsbDevices();
         for (int i = 0;i<list.size();i++)
         {
             device = (UsbDevice)list.get(i);
             UsbDeviceDescriptor desc = device.getUsbDeviceDescriptor();
             if (desc.idVendor() == idVendor && desc.idProduct() == idProduct) {return device;}
             if (device.isUsbHub())
             {
                 device = findDevice((UsbHub) device);
                 if (device != null) return device;
             }
         }
         return null;
     }
 }

 注意点：发送和接收数据长度要与设备匹配