How to discover a File's creation time with Java?
With the release of Java 7 there is a built-in way to do this:
Path path = Paths.get("path/to/file");BasicFileAttributes attributes = Files.readAttributes(path, BasicFileAttributes.class);FileTime creationTime = attributes.creationTime();It is important to note that not all operating systems provide this information. I believe in those instances this returns the mtime which is the last modified time.
Windows does provide creation time.
I've wrote a small test class some days ago, wish it can help you:
// Get/Set windows file CreationTime/LastWriteTime/LastAccessTime// Test with jna-3.2.7// [http://maclife.net/wiki/index.php?title=Java_get_and_set_windows_system_file_creation_time_via_JNA_(Java_Native_Access)][1]import java.io.*;import java.nio.*;import java.util.Date;// Java Native Access library: jna.dev.java.netimport com.sun.jna.*;import com.sun.jna.ptr.*;import com.sun.jna.win32.*;import com.sun.jna.platform.win32.*;public class WindowsFileTime{ public static final int GENERIC_READ = 0x80000000; //public static final int GENERIC_WRITE = 0x40000000; // defined in com.sun.jna.platform.win32.WinNT public static final int GENERIC_EXECUTE = 0x20000000; public static final int GENERIC_ALL = 0x10000000; // defined in com.sun.jna.platform.win32.WinNT //public static final int CREATE_NEW = 1; //public static final int CREATE_ALWAYS = 2; //public static final int OPEN_EXISTING = 3; //public static final int OPEN_ALWAYS = 4; //public static final int TRUNCATE_EXISTING = 5; public interface MoreKernel32 extends Kernel32 { static final MoreKernel32 instance = (MoreKernel32)Native.loadLibrary ("kernel32", MoreKernel32.class, W32APIOptions.DEFAULT_OPTIONS); boolean GetFileTime (WinNT.HANDLE hFile, WinBase.FILETIME lpCreationTime, WinBase.FILETIME lpLastAccessTime, WinBase.FILETIME lpLastWriteTime); boolean SetFileTime (WinNT.HANDLE hFile, final WinBase.FILETIME lpCreationTime, final WinBase.FILETIME lpLastAccessTime, final WinBase.FILETIME lpLastWriteTime); } static MoreKernel32 win32 = MoreKernel32.instance; //static Kernel32 _win32 = (Kernel32)win32; static WinBase.FILETIME _creationTime = new WinBase.FILETIME (); static WinBase.FILETIME _lastWriteTime = new WinBase.FILETIME (); static WinBase.FILETIME _lastAccessTime = new WinBase.FILETIME (); static boolean GetFileTime (String sFileName, Date creationTime, Date lastWriteTime, Date lastAccessTime) { WinNT.HANDLE hFile = OpenFile (sFileName, GENERIC_READ); // may be WinNT.GENERIC_READ in future jna version. if (hFile == WinBase.INVALID_HANDLE_VALUE) return false; boolean rc = win32.GetFileTime (hFile, _creationTime, _lastAccessTime, _lastWriteTime); if (rc) { if (creationTime != null) creationTime.setTime (_creationTime.toLong()); if (lastAccessTime != null) lastAccessTime.setTime (_lastAccessTime.toLong()); if (lastWriteTime != null) lastWriteTime.setTime (_lastWriteTime.toLong()); } else { int iLastError = win32.GetLastError(); System.out.print ("获取文件时间失败，错误码：" + iLastError + " " + GetWindowsSystemErrorMessage (iLastError)); } win32.CloseHandle (hFile); return rc; } static boolean SetFileTime (String sFileName, final Date creationTime, final Date lastWriteTime, final Date lastAccessTime) { WinNT.HANDLE hFile = OpenFile (sFileName, WinNT.GENERIC_WRITE); if (hFile == WinBase.INVALID_HANDLE_VALUE) return false; ConvertDateToFILETIME (creationTime, _creationTime); ConvertDateToFILETIME (lastWriteTime, _lastWriteTime); ConvertDateToFILETIME (lastAccessTime, _lastAccessTime); //System.out.println ("creationTime: " + creationTime); //System.out.println ("lastWriteTime: " + lastWriteTime); //System.out.println ("lastAccessTime: " + lastAccessTime); //System.out.println ("_creationTime: " + _creationTime); //System.out.println ("_lastWriteTime: " + _lastWriteTime); //System.out.println ("_lastAccessTime: " + _lastAccessTime); boolean rc = win32.SetFileTime (hFile, creationTime==null?null:_creationTime, lastAccessTime==null?null:_lastAccessTime, lastWriteTime==null?null:_lastWriteTime); if (! rc) { int iLastError = win32.GetLastError(); System.out.print ("设置文件时间失败，错误码：" + iLastError + " " + GetWindowsSystemErrorMessage (iLastError)); } win32.CloseHandle (hFile); return rc; } static void ConvertDateToFILETIME (Date date, WinBase.FILETIME ft) { if (ft != null) { long iFileTime = 0; if (date != null) { iFileTime = WinBase.FILETIME.dateToFileTime (date); ft.dwHighDateTime = (int)((iFileTime >> 32) & 0xFFFFFFFFL); ft.dwLowDateTime = (int)(iFileTime & 0xFFFFFFFFL); } else { ft.dwHighDateTime = 0; ft.dwLowDateTime = 0; } } } static WinNT.HANDLE OpenFile (String sFileName, int dwDesiredAccess) { WinNT.HANDLE hFile = win32.CreateFile ( sFileName, dwDesiredAccess, 0, null, WinNT.OPEN_EXISTING, 0, null ); if (hFile == WinBase.INVALID_HANDLE_VALUE) { int iLastError = win32.GetLastError(); System.out.print (" 打开文件失败，错误码：" + iLastError + " " + GetWindowsSystemErrorMessage (iLastError)); } return hFile; } static String GetWindowsSystemErrorMessage (int iError) { char[] buf = new char[255]; CharBuffer bb = CharBuffer.wrap (buf); //bb.clear (); //PointerByReference pMsgBuf = new PointerByReference (); int iChar = win32.FormatMessage ( WinBase.FORMAT_MESSAGE_FROM_SYSTEM //| WinBase.FORMAT_MESSAGE_IGNORE_INSERTS //|WinBase.FORMAT_MESSAGE_ALLOCATE_BUFFER , null, iError, 0x0804, bb, buf.length, //pMsgBuf, 0, null ); //for (int i=0; i<iChar; i++) //{ // System.out.print (" "); // System.out.print (String.format("%02X", buf[i]&0xFFFF)); //} bb.limit (iChar); //System.out.print (bb); //System.out.print (pMsgBuf.getValue().getString(0)); //win32.LocalFree (pMsgBuf.getValue()); return bb.toString (); } public static void main (String[] args) throws Exception { if (args.length == 0) { System.out.println ("获取 Windows 的文件时间（创建时间、最后修改时间、最后访问时间）"); System.out.println ("用法："); System.out.println (" java -cp .;..;jna.jar;platform.jar WindowsFileTime [文件名1] [文件名2]..."); return; } boolean rc; java.sql.Timestamp ct = new java.sql.Timestamp(0); java.sql.Timestamp wt = new java.sql.Timestamp(0); java.sql.Timestamp at = new java.sql.Timestamp(0); for (String sFileName : args) { System.out.println ("文件 " + sFileName); rc = GetFileTime (sFileName, ct, wt, at); if (rc) { System.out.println (" 创建时间：" + ct); System.out.println (" 修改时间：" + wt); System.out.println (" 访问时间：" + at); } else { //System.out.println ("GetFileTime 失败"); } //wt.setTime (System.currentTimeMillis()); wt = java.sql.Timestamp.valueOf("2010-07-23 00:00:00"); rc = SetFileTime (sFileName, null, wt, null); if (rc) { System.out.println ("SetFileTime (最后修改时间) 成功"); } else { //System.out.println ("SetFileTime 失败"); } } }}
I've been investigating this myself, but I need something that will work across Windows/*nix platforms.
One SO post includes some links to Posix JNI implementations.
In particular, JNA-POSIX implements methods for getting file stats with implementations for Windows, BSD, Solaris, Linux and OSX.
All in all it looks very promising, so I'll be trying it out on my own project very soon.