java使OA信用盘网站开发用usb4java读取usb连接的设备

1、最近OA信用盘网站开发 haozbbs.com Q1446595067在做一个java与usb通信的项目，在我原来的理解中，java是不能读取电脑底层设备信息的，所有就让人用C写一个中间程序来传递数据。但是最近在查询资料的时候，看到usb4java是写好的jar包，可以用java读取硬件设备，虽然最终不知道是什么原因一直无法读取我公司的硬件设备，但是可以查看到鼠标、键盘、手机是否连接usb。做一个参考吧。

2、首先需要查看usb连接的idVendor和idProduct；java需要根据这个来判断是哪个usb

（1）我的电脑右键--管理--设备管理器

(2)点击要查看的设备，点击详细信息，选择硬件ID；下图的idVendor=12D1；idProduct=1082的16进制数

3、代码：

（1）引入的包：

      <dependency>
        <groupId>org.usb4java</groupId>
        <artifactId>usb4java-javax</artifactId>
        <version>1.2.0</version>

      </dependency>

（2）需要在resource下加入允许使用jar包的文件javax.usb.properties;里面的内容为：javax.usb.services = org.usb4java.javax.Services

（3）class代码如下：

package com.jda.iwpss.test;

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.UsbInterfacePolicy;
import javax.usb.UsbPipe;

public class UsbTest {
private static short idVendor = (short)0x12D1;
private static short idProduct = (short)0x1082;

public static void main(String[] args) {
    try {
        UsbPipe sendUsbPipe = new UsbTest().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 = configuration.getUsbInterface((byte) 1);
    } else {
        return null;
    }
    iface.claim(new UsbInterfacePolicy()
    {            
        @Override
        public boolean forceClaim(UsbInterface usbInterface)
        {
            return true;
        }
    });
    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();
        System.out.println(i+"___"+desc.idVendor()+"___"+desc.idProduct());
        if (desc.idVendor() == idVendor && desc.idProduct() == idProduct) {return device;}
        if (device.isUsbHub())
        {
            device = findDevice((UsbHub) device);
            if (device != null) return device;
        }
    }
    return null;
}

}