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