从Java中检测到的USB中查找特定文件

Question

I am using Java codes to find a file that ends with a certain extension in a detected removable storage. I am trying to link the two codes together but I am not sure on how I can do so. These are the codes I am using:

DetectDrive.java

import java.io.*;
import java.util.*;
import javax.swing.filechooser.FileSystemView;

public class DetectDrive
{
    public String USBDetect()
    {
        String driveLetter = "";
        FileSystemView fsv = FileSystemView.getFileSystemView();

        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")))
            {
                //log.info("Detected PEN Drive: " + drive + " - "+ displayName); 
                driveLetter = drive;
                break;
            }
        }

        /*if (driveLetter.equals(""))
        {
            System.out.println("Not found!");
        } 
        else 
        {
            System.out.println(driveLetter);
        }
        */

        //System.out.println(driveLetter);
        return driveLetter;
    }
}

FileSarch.java

import java.io.*;

public class FileSearch
{   
    public String find(File dir) 
    {
        String pattern = ".raw";

        File listFile[] = dir.listFiles();
        if (listFile != null) 
        {
            for (int i=0; i<listFile.length; i++) 
            {
                if (listFile[i].isDirectory()) 
                {
                    find(listFile[i]);
                } else 
                { 
                    if (listFile[i].getName().endsWith(pattern)) 
                    {
                        System.out.println(listFile[i].getPath());
                    }
                }
            }
        }
        return pattern;
    }
}

The file that I want the program to search ends with a .raw extension and I want the program to search for the file in the detected removable storage (eg F:). How do I link these 2 codes together? If possible I would like an example of codes to link them. I got the codes for FileSearch.java from http://rosettacode.org/wiki/Walk_a_directory/Recursively#Java

Answer 1

First, change USBDetect by replacing String driveLetter with File removableDrive , and return that. Then pass the value returned from USBDetect into find .

Answer 2

Heres how I would do it, however I would also make the methods USBDetect and find static, they both dont seem to have any objects their referencing in their parent class. Also make USBDetect return a File instead of a String

public static void main(String [] args) {
    // look for the drive
    String drive = (new DetectDrive()).USBDetect();
    // if it found a drive (null or empty string says no)
    if(drive != null && !drive.isEmpty()) {
        // look for a file in that drive
        FileSearch fileSearch = new FileSearch();
        fileSearch.find(new File(drive+":"));
    }
}