JAVA 监听USB扫描枪数据代码

好的，我了解您的要求。以下是一个简单的Java代码示例，用于监听USB扫描枪数据：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.TooManyListenersException;

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

import jssc.SerialPort;
import jssc.SerialPortEvent;
import jssc.SerialPortEventListener;
import jssc.SerialPortException;

public class USBScannerListener implements SerialPortEventListener {

    private static final int VENDOR_ID = 0x067B;
    private static final int PRODUCT_ID = 0x2303;
    private static final int DATA_BITS = 8;
    private static final int STOP_BITS = 1;
    private static final int PARITY = 0;
    private static final int BAUD_RATE = 9600;

    private SerialPort serialPort;

    public USBScannerListener() {
        // 查找特定的 USB 设备
        UsbDevice device = findDevice(VENDOR_ID, PRODUCT_ID);

        if (device == null) {
            System.err.println("USB Scanner not found.");
            return;
        }

        // 在USB设备上找到输入端点
        UsbInterface iface = findInterface(device);
        UsbEndpoint endpoint = (UsbEndpoint) iface.getUsbEndpoints().get(0);

        try {
            // 打开 USB 传输管道
            UsbPipe pipe = endpoint.getUsbPipe();
            pipe.open();

            // 设置串口参数
            serialPort = new SerialPort("COM1");
            serialPort.openPort();
            serialPort.setParams(BAUD_RATE, DATA_BITS, STOP_BITS, PARITY);
            
            // 注册串口数据监听事件
            serialPort.addEventListener(this);
            serialPort.setEventsMask(SerialPort.MASK_RXCHAR);
        } catch (UsbException | TooManyListenersException | SerialPortException ex) {
            System.err.println("Error initializing USB scanner listener: " + ex.getMessage());
        }
    }

    private UsbDevice findDevice(int vendorId, int productId) {
        UsbDevice device = null;

        try {
            // 获取 USB 根集线器
            UsbHub rootHub = UsbHostManager.getUsbServices().getRootUsbHub();
            
            // 递归遍历 USB 树来查找设备
            device = findDevice(rootHub, vendorId, productId);
        } catch (SecurityException | UsbException ex) {
            System.err.println("Error finding USB device: " + ex.getMessage());
        }

        return device;
    }

    private UsbDevice findDevice(UsbHub hub, int vendorId, int productId)
            throws SecurityException, UsbException {

        UsbDevice device = null;

        // 遍历每个 USB 设备
        for (UsbDevice d : (Iterable<UsbDevice>) hub.getAttachedUsbDevices()) {

            // 如果设备有子集线器，递归查找子集线器
            if (d.isUsbHub()) {
                device = findDevice((UsbHub) d, vendorId, productId);
                if (device != null) {
                    break;
                }
            }

            // 如果设备匹配给定的厂商ID和产品ID，则返回设备USB
            UsbDeviceDescriptor desc = d.getUsbDeviceDescriptor();
            if (desc.idVendor() == vendorId && desc.idProduct() == productId) {
                device = d;
                break;
            }
        }

        return device;
    }

    private UsbInterface findInterface(UsbDevice device) throws UsbException {
        UsbInterface iface = null;

        // 遍历每个配置并找到第一个具有输入端点的接口
        for (UsbConfiguration config : (Iterable<UsbConfiguration>) device.getUsbConfigurations()) {
            for (UsbInterface i : (Iterable<UsbInterface>) config.getUsbInterfaces()) {
                if (i.getUsbEndpoints().size() > 0) {
                    iface = i;
                    break;
                }
            }
            if (iface != null) {
                break;
            }
        }

        if (iface == null) {
            throw new UsbException("Device does not have any interfaces with input endpoints.");
        }

        return iface;
    }

    @Override
    public void serialEvent(SerialPortEvent event) {
        if (event.isRXCHAR()) {
            try {
                // 读取串口数据并输出到控制台
                String data = serialPort.readString();
                System.out.println(data);
            } catch (SerialPortException ex) {
                System.err.println("Error reading data from serial port: " + ex.getMessage());
            }
        }
    }

    public static void main(String[] args) throws IOException {
        // 创建 USB 扫描仪侦听器
        USBScannerListener listener = new USBScannerListener();

        // 在按下回车键之前等待用户输入
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        System.out.println("Press Enter to exit.");
        br.readLine();

        // 关闭串口和 USB 管道
        try {
            listener.serialPort.closePort();
            listener.serialPort.removeEventListener();
            listener.serialPort = null;
        } catch (SerialPortException ex) {
            System.err.println("Error closing serial port: " + ex.getMessage());
        }
    }

}

这个代码在 jssc 库的帮助下工作，它是一组Java命令，可以访问串口和USB设备和数据的通信。 若要使用此示例，请确保已安装jssc库。