JAVA按照最近访问时间输出windows文件系统目录的文件列表
提示
在windows系统2003 sp1以上版本，这个文件最后访问时间的功能都被默认关闭了的，哎
因为我在JWFDV0.97版本中要在流程设计器主菜单里面给出最近访问的5个流程图的列表，所以需要在JWFD中给出查找文件的最近访问时间的功能模块
由于用JDK1.7以下的File类没有读取最近文件访问时间这个功能，因为在jdk1.6版本中，我们必须应用其它办法来实现这个功能
这几天找啊找，在 chinaunix论坛上面找到一个JAVA通过jna访问windows文件系统访问时间的类文件，感谢无名的作者，我集成了一下，给出代码，方便大家引用。。。
读取windows文件系统的访问时间,修改时间，创建时间类
import java.io.*;
import java.nio.*;
import java.util.Date;
// Java Native Access: http://jna.dev.java.net
// Test with jna-3.2.7
import 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 ();
}
//测试读取一个文件的最后访问时间
public static void main (String[] args) throws Exception
{
/*boolean rc;
java.sql.Timestamp at = new java.sql.Timestamp(0);
String filename = "E:\\java\\jwfd\\jwfdv0.96\\jwfd v0.96\\gxl_temp\\test006.gxl";
System.out.println(at);
*/
}
//add by comsci 2013.2.28
public String GetFilelastAccessTime(String filename){
String act = "";
java.sql.Timestamp at = new java.sql.Timestamp(0);
boolean rc;
rc = GetFileTime (filename, null, null, at);
if (rc){
act = at.toString();
}else{
act = "读取文件失败";
}
return act;
}
/* 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");
}
}
}*/
}
将某个目录下面最近访问的文件写入map
public static Map<Integer, String> ListFileOpenRecent(String filepath,
Map<Integer, String> fileMap) throws Exception {
Map<Integer, String> filelist1 = new HashMap<Integer, String>();
if (fileMap == null) {
fileMap = new HashMap<Integer, String>();
}
try {
Map<Integer, String> filemap = readfile(filepath, null);
for (int i = 0; i < filemap.size(); i++) {
filelist1.put(new Long((ftc.cov_datetomilltime(ftc
.get_systime()) - ftc.cov_datetomilltime(wft
.GetFilelastAccessTime(filemap.get(i))))).intValue(),
filemap.get(i));
}
} catch (Exception ex) {
}
// Collections.sort(filelist1);
// System.out.println(filelist1.toString());
return filelist1;
}
这个方法要和上面这个方法放在一起
public static Map<Integer, String> readfile(String filepath, Map<Integer, String> pathMap) throws Exception {
if (pathMap == null) {
pathMap = new HashMap<Integer, String>();
}
File file = new File(filepath);
// 文件
if (!file.isDirectory()) {
pathMap.put(pathMap.size(), file.getPath());
} else if (file.isDirectory()) { // 如果是目录， 遍历所有子目录取出所有文件名
String[] filelist = file.list();
for (int i = 0; i < filelist.length; i++) {
File readfile = new File(filepath + "/" + filelist[i]);
if (!readfile.isDirectory()) {
pathMap.put(pathMap.size(), readfile.getPath());
} else if (readfile.isDirectory()) { // 子目录的目录
readfile(filepath + "/" + filelist[i], pathMap);
}
}
}
return pathMap;
}
主函数调用,把下面的文件目录修改为自己的文件目录
public static void main(String argv[]) {
apptools apt = new apptools();
try {
//应用TREEMAP按照KEY值排序,输出按照最近访问时间(最少秒数)排序的文件列表
TreeMap treemap = new TreeMap(apt.ListFileOpenRecent(
"E:\\java\\jwfd\\jwfdv0.96\\jwfd v0.96\\gxl_temp", null));
Iterator it= treemap.entrySet().iterator();
while(it.hasNext()){
System.out.println(it.next());
}
} catch (Exception e) {
// TODO: handle exception
}
//时间格式转换为秒函数 为适用于map读取Key，把long值转换为int值,原来的毫秒变为秒
上面的方法要用到的代码
public long cov_datetomilltime(String time){
long ti = 0;
try {
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date date2 = null;
date2 = dateFormat.parse(time);
ti = date2.getTime()/1000;
}
catch (ParseException ex) {
}
return ti;
}
public String get_systime() {
String time = "";
java.util.Date date = new java.util.Date();
time = wudt.getCurrentDate(date);
return time;
}
附件是需要的jar包。。。。感谢CSDN的朋友 如果代码有什么问题，请给我发消息，我把整个代码包给大家。。。