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identify file system format of a disk type in java like ntfs, fat16/32 or ext

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By User



Is there any way to find out file system format of a disk in java. example for windows harddisk is ntfs, for zip dirves it is fat32. I've checked java.io.File but no help.




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  1. Tips For AllFebruary 25, 2012 at 1:41 PM

    N.B. This is only valid for Java running on Windows system:

    Using JNA, you can call Win32 Kernel32's GetVolumeInformation() to retrieve lpFileSystemNameBuffer parameter which receives the name of the file system, for example, the FAT file system or the NTFS file system http://msdn.microsoft.com/en-us/library/windows/desktop/aa364993(v=vs.85).aspx

    Kernel32.java:

    package filesystem;


    import java.util.HashMap;
    import java.util.Map;

    import com.sun.jna.Library;
    import com.sun.jna.Native;
    import com.sun.jna.platform.win32.WinDef.DWORD;
    import com.sun.jna.ptr.IntByReference;
    import com.sun.jna.win32.StdCallLibrary;
    import com.sun.jna.win32.W32APIFunctionMapper;
    import com.sun.jna.win32.W32APITypeMapper;

    public interface Kernel32 extends StdCallLibrary {

    final static Map<String, Object> WIN32API_OPTIONS = new HashMap<String, Object>() {

    private static final long serialVersionUID = 1L;

    {
    put(Library.OPTION_FUNCTION_MAPPER, W32APIFunctionMapper.UNICODE);
    put(Library.OPTION_TYPE_MAPPER, W32APITypeMapper.UNICODE);
    }
    };

    public Kernel32 INSTANCE = (Kernel32) Native.loadLibrary("Kernel32", Kernel32.class, WIN32API_OPTIONS);

    /*
    BOOL WINAPI GetVolumeInformation(
    __in_opt LPCTSTR lpRootPathName,
    __out LPTSTR lpVolumeNameBuffer,
    __in DWORD nVolumeNameSize,
    __out_opt LPDWORD lpVolumeSerialNumber,
    __out_opt LPDWORD lpMaximumComponentLength,
    __out_opt LPDWORD lpFileSystemFlags,
    __out LPTSTR lpFileSystemNameBuffer,
    __in DWORD nFileSystemNameSize
    );
    */
    public boolean GetVolumeInformation(
    String lpRootPathName,
    char[] lpVolumeNameBuffer,
    DWORD nVolumeNameSize,
    IntByReference lpVolumeSerialNumber,
    IntByReference lpMaximumComponentLength,
    IntByReference lpFileSystemFlags,
    char[] lpFileSystemNameBuffer,
    DWORD nFileSystemNameSize
    );

    public int GetLastError();
    }


    VolumeInformation.java:

    package filesystem;

    import ping.Kernel32;

    import com.sun.jna.platform.win32.WinDef.DWORD;
    import com.sun.jna.ptr.IntByReference;

    public class VolumeInformation {

    static void getFileSystemName(){
    char[] lpVolumeNameBuffer = new char[256];
    DWORD nVolumeNameSize = new DWORD(256);
    IntByReference lpVolumeSerialNumber = new IntByReference();
    IntByReference lpMaximumComponentLength = new IntByReference();
    IntByReference lpFileSystemFlags = new IntByReference();

    char[] lpFileSystemNameBuffer = new char[256];
    DWORD nFileSystemNameSize = new DWORD(256);

    lpVolumeSerialNumber.setValue(0);
    lpMaximumComponentLength.setValue(256);
    lpFileSystemFlags.setValue(0);

    Kernel32.INSTANCE.GetVolumeInformation(
    "C:\\",
    lpVolumeNameBuffer,
    nVolumeNameSize,
    lpVolumeSerialNumber,
    lpMaximumComponentLength,
    lpFileSystemFlags,
    lpFileSystemNameBuffer,
    nFileSystemNameSize);

    System.out.println("Last error: "+Kernel32.INSTANCE.GetLastError()+"\n\n");

    String fs = new String(lpFileSystemNameBuffer);
    System.out.println(fs.trim());

    }

    /**
    * @param args
    */
    public static void main(String[] args) {
    getFileSystemName();
    }

    }

    ReplyDelete
  2. Tips For AllFebruary 25, 2012 at 1:41 PM

    What version of Java are you using?

    If Java 7 - Check out this API - http://docs.oracle.com/javase/7/docs/api/java/nio/file/FileSystems.html

    Outside of that I know System.getProperty and Runtime have methods to grab information on the disk being used but nothing that specifically calls out the File System type (NTFS, FAT32, etc.)

    ReplyDelete

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