如何使用java按上次更新时间排序SFTP文件？

我的FTP服务器中有一组文本文件。

我想阅读所有文件都是今天上传的。

其中我必须打印最后三个上传文件的属性。 （名称，上传时间，大小）。 现在我将能够打印存在于FTP服务器中的文件的名称和属性，但它不在订单中并显示为垃圾。 现在我想打印最后三个上传文件的名称，大小，路径，上传时间。

任何人都可以帮我实现这个目标吗？

这是我的片段：

package com; import java.io.File; import edu.vt.middleware.crypt.io.TeePrintStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.PrintStream; import java.net.ConnectException; //import java.sql.Date; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.Arrays; import java.util.Calendar; import java.util.Date; import javax.mail.MessagingException; import javax.mail.internet.AddressException; import org.apache.commons.io.FileUtils; import org.apache.commons.io.comparator.LastModifiedFileComparator; import org.apache.commons.net.ftp.FTPFile; import com.enterprisedt.net.ftp.FTPConnectMode; import com.enterprisedt.net.ftp.FTPException; import com.enterprisedt.net.ftp.FTPTransferType; import com.enterprisedt.net.ftp.Protocol; import com.enterprisedt.net.ftp.SecureFileTransferClient; import java.io.File; import java.io.FilenameFilter; import edu.vt.middleware.crypt.io.TeePrintStream; public class getFilesFTP { public static File dir=new File("D:/log_FTPCHECK"); public static String logname="output.txt"; public static File logfile=new File(dir,logname); public static StringBuffer sb=new StringBuffer(); public static byte[] filesize; public static void main(String args[]) throws Exception { sb.append("************************************* ************************************************ *********************************************************************"); sb.append("
SCOPUS FILE UPLOAD CHECK AUTO GENERATED LOG REPORT
"); sb.append("*********************************************** **************************************************************** *******************************************"); String host="example.com"; String username="john"; String password="doe"; int count=0; File Filename;; Date FileDate; String invalidfilename="."; String filetype=""; //DateFormat dateFormat = new SimpleDateFormat("dd/mm/year"); //String date1=""; String Lastmodifieddata=""; String Lastmodifieddata_time=""; Date todayDate; try{ SimpleDateFormat dateformat=new SimpleDateFormat("yyyy/MM/dd"); SimpleDateFormat Format_time=new SimpleDateFormat("yyyy/MM/dd HH:mm:ss"); String timeStamp = dateformat.format(Calendar.getInstance().getTime()); // System.out.println("I am executed2"); // System.out.println("Todays Date :"+timeStamp ); sb.append(System.lineSeparator()); //sb.append("Todays Date :"+timeStamp ); sb.append(System.lineSeparator()); // System.out.println("I am executed2"); SecureFileTransferClient client=new SecureFileTransferClient(); client.getAdvancedFTPSettings().setConnectMode(FTPConnectMode.PASV); client.setRemoteHost(host); client.setUserName(username); client.setPassword(password); client.setProtocol(Protocol.SFTP); client.setRemotePort(22); client.setContentType(FTPTransferType.BINARY); // sb.append(System.lineSeparator()); System.out.println("connecting to sftp..."); // sb.append(System.lineSeparator()); sb.append("connecting to sftp..."); sb.append(System.lineSeparator()); client.connect(); System.out.println("SFTP Connection established successfully."); sb.append(System.lineSeparator()); sb.append("SFTP Connection established successfully."); sb.append(System.lineSeparator()); String path1="/sftp/content-providers/tho-e/data/incoming /scopusbk"; com.enterprisedt.net.ftp.FTPFile[] directroy = client.directoryList(path1); System.out.println("Total Number of Files Found :"+directroy.length); // Arrays.sort(directroy); // FTpFileComparator[] comp = new FTpFileComparator[files.length]; sb.append(System.lineSeparator()); //sb.append("Total Number of Files Found :"+directroy.length); sb.append(System.lineSeparator()); int x=0; for (int i = 0; i 0) { System.out.println("Total Number of files :"+count); sb.append(System.lineSeparator()); sb.append("Total Number of file :"+count); sb.append(System.lineSeparator()); } else { System.out.println("No Files uploaded today....!!!"); sb.append("No Files uploaded today....!!!"); } // PrintStream out = new PrintStream(new FileOutputStream("D:/output.txt")); // System.setOut(out); if(!logfile.exists()) { logfile.createNewFile(); } FileUtils.writeStringToFile(logfile,sb.toString()); FTPMailer.sendmailFTP(); count=0; } catch(SecurityException se) { System.out.println("Security credentials mismatch issue...Unable to Login "); sb.append(System.lineSeparator()); sb.append("Security credentials mismatch issue...Unable to Login "); sb.append(System.lineSeparator()); se.printStackTrace(); } catch(ConnectException ce) { System.out.println("Unable to Reach FTP Server.."); System.out.println("Check the Internet Connectivity"); sb.append(System.lineSeparator()); sb.append("Unable to Reach FTP Server.."); sb.append(System.lineSeparator()); sb.append("Check the Internet Connectivity"); sb.append(System.lineSeparator()); } } } 

|请帮助我google了很多但我无法达到FTP文件排序。

任何帮助都将非常感激。

Answer 1

一种解决方案可能是按降序对FTPFile[]进行排序（假设上次修改时间是上传时间）。

 Arrays.sort(ftpfiles, new Comparator() { @Override public int compare(FTPFile o1, FTPFile o2) { return o2.lastModified().compareTo(o1.lastModified()); } }); 

打印三个最近上传的文件（在排序数组后）

 for (int i = 0; i < 3) { // amend the output for your needs System.out.printn(ftpfiles[i]); } 

代码未经过测试。 基于FTPFile的javadoc 编写 。

编辑使用免费库版本测试的小片段。

 import com.enterprisedt.net.ftp.FTPFile; ... public static void main(String[] args) throws Exception { // create an array of dummy files Calendar cal = GregorianCalendar.getInstance(); FTPFile[] ftpfiles = new FTPFile[5]; cal.set(Calendar.SECOND, 1); ftpfiles[0] = new FTPFile("raw", "file1", 111, false, cal.getTime()); cal.set(Calendar.SECOND, 5); ftpfiles[1] = new FTPFile("raw", "file5", 555, false, cal.getTime()); cal.set(Calendar.SECOND, 3); ftpfiles[2] = new FTPFile("raw", "file3", 333, false, cal.getTime()); cal.set(Calendar.SECOND, 4); ftpfiles[3] = new FTPFile("raw", "file4", 444, false, cal.getTime()); cal.set(Calendar.SECOND, 2); ftpfiles[4] = new FTPFile("raw", "file2", 222, false, cal.getTime()); System.out.println("unsorted file list"); for (FTPFile ftpfile : ftpfiles) { printFileInfo(ftpfile); } // sort array by last modification time in descending order Arrays.sort(ftpfiles, new Comparator() { @Override public int compare(FTPFile o1, FTPFile o2) { return o2.lastModified().compareTo(o1.lastModified()); } }); System.out.println("sorted file list"); for (FTPFile ftpfile : ftpfiles) { printFileInfo(ftpfile); } System.out.println("the three recent files only"); for (int i = 0; i < 3; i++) { printFileInfo(ftpfiles[i]); } } static void printFileInfo(FTPFile ftpfile) { System.out.printf("name: %s mtime: %s size: %d%n", ftpfile.getName(), ftpfile.lastModified(), ftpfile.size() ); } 

产量

 unsorted file list name: file1 mtime: Fri Feb 12 12:23:01 CET 2016 size: 111 name: file5 mtime: Fri Feb 12 12:23:05 CET 2016 size: 555 name: file3 mtime: Fri Feb 12 12:23:03 CET 2016 size: 333 name: file4 mtime: Fri Feb 12 12:23:04 CET 2016 size: 444 name: file2 mtime: Fri Feb 12 12:23:02 CET 2016 size: 222 sorted file list name: file5 mtime: Fri Feb 12 12:23:05 CET 2016 size: 555 name: file4 mtime: Fri Feb 12 12:23:04 CET 2016 size: 444 name: file3 mtime: Fri Feb 12 12:23:03 CET 2016 size: 333 name: file2 mtime: Fri Feb 12 12:23:02 CET 2016 size: 222 name: file1 mtime: Fri Feb 12 12:23:01 CET 2016 size: 111 the three recent files only name: file5 mtime: Fri Feb 12 12:23:05 CET 2016 size: 555 name: file4 mtime: Fri Feb 12 12:23:04 CET 2016 size: 444 name: file3 mtime: Fri Feb 12 12:23:03 CET 2016 size: 333