identifica il formato del file system di un tipo di disco in java come ntfs, fat16/32 o ext

Question

Esiste un modo per scoprire il formato del file system di un disco in java?

Ad esempio per un disco rigido di Windows potrebbe essere NTFS, per le unità zip è FAT32.

Answer 1

N.B. Questo è valido solo per Java in esecuzione sul sistema di Windows:

Utilizzando JNA, è possibile chiamare Win32 Kernel32 GetVolumeInformation() per recuperare lpFileSystemNameBuffer parametro che receives the name of the file system, for example, the FAT file system or the NTFS file systemhttp://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(); 
    } 

} 

Answer 2

Quale versione di Java stai usando?

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

Al di fuori di quello che so System.getProperty e Runtime hanno metodi per afferrare le informazioni sul disco in uso ma niente che chiede in particolare il tipo di file system (NTFS , FAT32, ecc.)