如何从java代码中检测附加的usb设备

Question

我正在创建一个java应用程序，用于检测系统连接设备的列表。当我运行应用程序时，它没有显示任何连接的设备...这是我的java代码请帮我工作这个

package com.mqs.lakshman;

import java.io.File;

import javax.swing.filechooser.FileSystemView;

public class Usbactivity 
{

    static String driveLetter="";
    static FileSystemView fsv = FileSystemView.getFileSystemView();

    public static void main(String[] args) 
    {
        File[] f = File.listRoots();
        for (int i = 0; i < f.length; i++) {
              String drive = f[i].getPath();
              String displayName = fsv.getSystemDisplayName(f[i]);
              String type = fsv.getSystemTypeDescription(f[i]);
              boolean isDrive = fsv.isDrive(f[i]);
              boolean isFloppy = fsv.isFloppyDrive(f[i]);
              boolean canRead = f[i].canRead();
              boolean canWrite = f[i].canWrite();

              if (canRead && canWrite && !isFloppy && isDrive && (type.toLowerCase().contains("removable") || type.toLowerCase().contains("rimovibile"))) 
              {
                System.out.println("Detected PEN Drive: " + drive + " - "+ displayName);
                driveLetter = drive;
                break;
              }                     
            }

            if (driveLetter.equals("")) 
            {

            } 
            else
            {


            }


    }

}