使用Java在Windows中获取唯一的文件ID？

Question

我正在寻找一种方式来获得在Java应用程序的唯一文件ID，并跨越这来了：

Unique file identifier in windows

现在，我试图通过阿什利亨德森本人（即问一个提供答案问题），并在C＃中工作得很好。但我需要在Java中这样做，才能使应用程序跨平台工作。

有什么办法来港这对Java或得到了相同的ID一些其他的方式？

编辑：

我几乎得到了它现在的工作，利用EEE解决方案，只有我需要它是在图书馆，当我编译为一个库，我得到一个错误，即使一切在包含所有内容的测试应用程序中正常工作。但我尝试导入（无编译器错误）一个单独的图书馆中，我得到这个运行时错误：

debug: 
Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/jna/Structure 
    at java.lang.ClassLoader.defineClass1(Native Method) 
    at java.lang.ClassLoader.defineClass(ClassLoader.java:791) 
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) 
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:449) 
    at java.net.URLClassLoader.access$100(URLClassLoader.java:71) 
    at java.net.URLClassLoader$1.run(URLClassLoader.java:361) 
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354) 
    at java.lang.ClassLoader.loadClass(ClassLoader.java:423) 
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) 
    at java.lang.ClassLoader.loadClass(ClassLoader.java:356) 
    at winfileid.FileId.getFileId(FileId.java:37) 
    at testfileid.TestFileId.main(TestFileId.java:19) 
Caused by: java.lang.ClassNotFoundException: com.sun.jna.Structure 
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366) 
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354) 
    at java.lang.ClassLoader.loadClass(ClassLoader.java:423) 
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) 
    at java.lang.ClassLoader.loadClass(ClassLoader.java:356) 
    ... 14 more 
Java Result: 1 
BUILD SUCCESSFUL (total time: 0 seconds) 

我已经包括在库中jna.jar和platform.jar当我编译它...请再次注意，我对Java很新，但是我做错了什么？

Answer 1

使用JNA版本3.3.0：

Kernel32.INSTANCE.GetFileInformationByHandle测试用例：

package win.test; 

import com.sun.jna.platform.win32.Kernel32; 
import com.sun.jna.platform.win32.WinBase; 
import com.sun.jna.platform.win32.WinBase.FILETIME; 
import com.sun.jna.platform.win32.WinNT.HANDLE; 

import win.test.Kernel32.BY_HANDLE_FILE_INFORMATION; 


public class FileTest { 

    /** 
    * @param args 
    */ 
    public static void main(String[] args) { 
     //http://msdn.microsoft.com/en-us/library/windows/desktop/aa363858%28v=vs.85%29.aspx 
     final int FILE_SHARE_READ = (0x00000001); 
     //final int FILE_SHARE_WRITE = (0x00000002); 
     //final int FILE_SHARE_DELETE = (0x00000004); 
     final int OPEN_EXISTING = (3); 
     final int GENERIC_READ = (0x80000000); 
     //final int GENERIC_WRITE = (0x40000000); 
     //final int FILE_FLAG_NO_BUFFERING = (0x20000000); 
     //final int FILE_FLAG_WRITE_THROUGH = (0x80000000); 
     //final int FILE_READ_ATTRIBUTES = (0x0080); 
     //final int FILE_WRITE_ATTRIBUTES = (0x0100); 
     //final int ERROR_INSUFFICIENT_BUFFER = (122); 
     final int FILE_ATTRIBUTE_ARCHIVE = (0x20); 

     WinBase.SECURITY_ATTRIBUTES attr = null; 
     BY_HANDLE_FILE_INFORMATION lpFileInformation = new BY_HANDLE_FILE_INFORMATION(); 
     HANDLE hFile = null; 

     hFile = Kernel32.INSTANCE.CreateFile(args[0], GENERIC_READ, FILE_SHARE_READ, attr, OPEN_EXISTING, FILE_ATTRIBUTE_ARCHIVE, null); 

     System.out.println("CreateFile last error:" + Kernel32.INSTANCE.GetLastError()); 

     //if (hFile. != -1) 
     { 

      win.test.Kernel32.INSTANCE.GetFileInformationByHandle(hFile, lpFileInformation); 

      System.out.println("CREATION TIME: " + FILETIME.filetimeToDate(lpFileInformation.ftCreationTime.dwHighDateTime, lpFileInformation.ftCreationTime.dwLowDateTime)); 

      System.out.println("VOLUME SERIAL NO.: " + Integer.toHexString(lpFileInformation.dwVolumeSerialNumber.intValue())); 

      System.out.println("FILE INDEX HIGH: " + lpFileInformation.nFileIndexHigh); 
      System.out.println("FILE INDEX LOW: " + lpFileInformation.nFileIndexLow); 


      System.out.println("GetFileInformationByHandle last error:" + Kernel32.INSTANCE.GetLastError()); 
     } 

     Kernel32.INSTANCE.CloseHandle(hFile); 

     System.out.println("CloseHandle last error:" + Kernel32.INSTANCE.GetLastError()); 

    } 

} 

输出示例：

CreateFile last error:0 
CREATION TIME: Tue Nov 29 22:24:04 SGT 2011 
VOLUME SERIAL NO.: 900c0655 
FILE INDEX HIGH: 1769472 
FILE INDEX LOW: 286306 
GetFileInformationByHandle last error:0 
CloseHandle last error:0 

的Kernel32 JNA实例类：

package win.test; 

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

import com.sun.jna.Library; 
import com.sun.jna.Native; 
import com.sun.jna.Pointer; 
import com.sun.jna.Structure; 
import com.sun.jna.WString; 
import com.sun.jna.platform.win32.WinBase.FILETIME; 
import com.sun.jna.platform.win32.WinDef.DWORD; 
import com.sun.jna.platform.win32.WinNT.HANDLE; 
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); 

    public int GetLastError(); 

    /** 
    typedef struct _BY_HANDLE_FILE_INFORMATION { 
      DWORD dwFileAttributes; 
      FILETIME ftCreationTime; 
      FILETIME ftLastAccessTime; 
      FILETIME ftLastWriteTime; 
      DWORD dwVolumeSerialNumber; 
      DWORD nFileSizeHigh; 
      DWORD nFileSizeLow; 
      DWORD nNumberOfLinks; 
      DWORD nFileIndexHigh; 
      DWORD nFileIndexLow; 
     } BY_HANDLE_FILE_INFORMATION, *PBY_HANDLE_FILE_INFORMATION; 
    */ 

    public class BY_HANDLE_FILE_INFORMATION extends Structure { 
     public DWORD dwFileAttributes; 
     public FILETIME ftCreationTime; 
     public FILETIME ftLastAccessTime; 
     public FILETIME ftLastWriteTime; 
     public DWORD dwVolumeSerialNumber; 
     public DWORD nFileSizeHigh; 
     public DWORD nFileSizeLow; 
     public DWORD nNumberOfLinks; 
     public DWORD nFileIndexHigh; 
     public DWORD nFileIndexLow; 
     public static class ByReference extends BY_HANDLE_FILE_INFORMATION implements Structure.ByReference { 

     }; 
     public static class ByValue extends BY_HANDLE_FILE_INFORMATION implements Structure.ByValue { 

     };   
    }; 

    /** 
    BOOL WINAPI GetFileInformationByHandle(
       __in HANDLE hFile, 
       __out LPBY_HANDLE_FILE_INFORMATION lpFileInformation 
      ); 
    */ 
    boolean GetFileInformationByHandle(
       HANDLE hFile, 
       BY_HANDLE_FILE_INFORMATION lpFileInformation 
      ); 
} 

Answer 2

不能使用文件路径作为其唯一的ID？！

完整的文件路径是足够的唯一...

Answer 3

在Java中，你需要JNI，原生的C编译，既适用于Windows（使用C＃代码），以及Unix/Linux操作系统（使用文件的索引节点）。老实说，我不认为这是非常安全的。