Java怎么访问USB设备

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编者注

由于需要对某usb设备获取的数值进行转发和广播，则选择最熟悉的java作为切入语言解决。历经辛苦，测试成功。

JSR-80

通过查看Java的标准协会在制定标准的时候是具有JSR-80的制定的。API为javax.usb。但是通过当前(JDK 8作为默认)，无论是J2ME、J2SE、J2EE都没有对JSR进行实现。

JSR80

API

javax.usb API

Simple

javax-usb-example

问题

通过阅读，能够得知没有Windows实现，或者Windows实现有问题，则需要其他方式。我们通过usb4java库的实现，在通过usb4java-javax的连接实现javax.usb

usb4java

usb4java 官网

usb4java - quick start guide
通过快速开始了解到usb4java的两种api，底层API是针对libusb的，高层API是针对javax.usb
High-level (javax-usb) API
注意：必须添加javax.usb.properties

实施

开发环境为Windows

引用库

以下是Gradle的链式引用

   compile group: 'javax.usb', name: 'usb-api', version: '1.0.2'        compile group: 'org.usb4java', name: 'usb4java', version: '1.2.0'        compile group: 'org.usb4java', name: 'usb4java-javax', version: '1.2.0'

配置文件

在Java项目下添加配置文件，路径为src\resources\javax.usb.properties

# src\resources\javax.usb.propertiesjavax.usb.services = org.usb4java.javax.Services

测试代码

package org.acifve.previz.broadcastserver.hid;import org.apache.commons.lang3.builder.ReflectionToStringBuilder;import org.junit.Test;import javax.usb.*;import java.util.ArrayList;import java.util.List;import static org.junit.Assert.*;public class UsbHIDSenderTest {    @Test    public void getUsbs() throws UsbException {        UsbServices usbServices = UsbHostManager.getUsbServices();        UsbHub usbHub = usbServices.getRootUsbHub();        List usbDevices = getAllUsbDevices(usbHub);        for (UsbDevice usbDevice : usbDevices)        {            System.out.println(ReflectionToStringBuilder.toString(usbDevice));        }    }    public static List getAllUsbDevices(UsbDevice usbDevice)    {        List list = new ArrayList();        list.add(usbDevice);                /* this is just normal recursion.  Nothing special. */        if (usbDevice.isUsbHub()) {            List devices = ((UsbHub)usbDevice).getAttachedUsbDevices();            for (int i=0; i
输出
org.usb4java.javax.RootHub@7dc36524[configurations=[org.usb4java.javax.RootHubConfiguration@3cb5cdba],descriptor=Device Descriptor:  bLength                 18  bDescriptorType          1  bcdUSB                1.01  bDeviceClass             9 Hub  bDeviceSubClass          0  bDeviceProtocol          0  bMaxPacketSize0          8  idVendor            0xffff  idProduct           0xffff  bcdDevice             0.00  iManufacturer            1  iProduct                 2  iSerial                  3  bNumConfigurations       1,listeners=org.usb4java.javax.DeviceListenerList@d041cf,rootPorts=org.usb4java.javax.Ports@129a8472]org.usb4java.javax.NonHub@1b0375b3[manager=org.usb4java.javax.DeviceManager@2752f6e2,id=Bus 001 Device 005: ID 138a:0090,parentId=Bus 001 Device 001: ID 8086:9d2f,speed=2,configurations=[USB configuration 01],configMapping={1=USB configuration 01},listeners=org.usb4java.javax.DeviceListenerList@1cd072a9,handle=,activeConfigurationNumber=1,claimedInterfaceNumbers=[],port=org.usb4java.javax.Port@7c75222b,queue=org.usb4java.javax.ControlIrpQueue@4c203ea1,detachedKernelDriver=false]org.usb4java.javax.NonHub@27f674d[manager=org.usb4java.javax.DeviceManager@2752f6e2,id=Bus 001 Device 002: ID 17ef:6039,parentId=Bus 001 Device 001: ID 8086:9d2f,speed=2,configurations=[USB configuration 01],configMapping={1=USB configuration 01},listeners=org.usb4java.javax.DeviceListenerList@48140564,handle=,activeConfigurationNumber=1,claimedInterfaceNumbers=[],port=org.usb4java.javax.Port@58ceff1,queue=org.usb4java.javax.ControlIrpQueue@7c30a502,detachedKernelDriver=false]org.usb4java.javax.NonHub@49e4cb85[manager=org.usb4java.javax.DeviceManager@2752f6e2,id=Bus 001 Device 004: ID 04f2:b5c1,parentId=Bus 001 Device 001: ID 8086:9d2f,speed=3,configurations=[USB configuration 01],configMapping={1=USB configuration 01},listeners=org.usb4java.javax.DeviceListenerList@43a25848,handle=,activeConfigurationNumber=1,claimedInterfaceNumbers=[],port=org.usb4java.javax.Port@3ac3fd8b,queue=org.usb4java.javax.ControlIrpQueue@5594a1b5,detachedKernelDriver=false]org.usb4java.javax.NonHub@6a5fc7f7[manager=org.usb4java.javax.DeviceManager@2752f6e2,id=Bus 001 Device 003: ID 8087:0a2b,parentId=Bus 001 Device 001: ID 8086:9d2f,speed=2,configurations=[USB configuration 01],configMapping={1=USB configuration 01},listeners=org.usb4java.javax.DeviceListenerList@1e643faf,handle=,activeConfigurationNumber=1,claimedInterfaceNumbers=[],port=org.usb4java.javax.Port@6e8dacdf,queue=org.usb4java.javax.ControlIrpQueue@7a79be86,detachedKernelDriver=false]org.usb4java.javax.NonHub@34ce8af7[manager=org.usb4java.javax.DeviceManager@2752f6e2,id=Bus 001 Device 009: ID 28de:2022,parentId=Bus 001 Device 001: ID 8086:9d2f,speed=2,configurations=[USB configuration 01],configMapping={1=USB configuration 01},listeners=org.usb4java.javax.DeviceListenerList@880ec60,handle=,activeConfigurationNumber=1,claimedInterfaceNumbers=[],port=org.usb4java.javax.Port@3f3afe78,queue=org.usb4java.javax.ControlIrpQueue@7f63425a,detachedKernelDriver=false]
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