How to get the twelve latest file in ftp server using ftp client in JAVA

Question

How to get the twelve latest file in ftp server using ftp client in JAVA

788 views Asked by Wroyce Misa At 17 June 2015 at 05:36

I want to read the 12 twelve latest XML files in FTP server using an FTP client but I only get the latest and the last one.

public static void main(String[] args) throws IOException
{
  FTPClient client = new FTPClient();
  try
  {
    client.connect(host);
    client.login(user, pwd);
    FTPFile[] files = client.listFiles();
    FTPFile lastFile = lastFileModified(files);
    System.out.println(lastFile.getName());
    client.disconnect();
  }
  catch (SocketException e)
  {
    // TODO Auto-generated catch block
    e.printStackTrace();
  }
  catch (IOException e)
  {
    // TODO Auto-generated catch block
    e.printStackTrace();
  }

}

public static FTPFile lastFileModified(FTPFile[] files)
{
  Date lastMod = files[0].getTimestamp().getTime();
  FTPFile choice = null;
  for (FTPFile file : files)
  {
    if (file.getTimestamp().getTime().after(lastMod))
    {
      choice = file;
      lastMod = file.getTimestamp().getTime();
    }
  }
  return choice;
}

Connection Success
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**/AGIN/20150616
201506170004.xml
/AGIN/20150616  LATEST　XML FILE
201506170004.xml**
/AGIN/lostAndfound/20150616
201506160536.xml
/AGIN/lostAndfound/20150616
201506160552.xml
/AGIN/lostAndfound/20150616
201506160608.xml
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201506160624.xml
Connection close

Original Q&A

There are 1 answers

**Kenneth Clark** · Answer 1 · 2015-06-17 05:58:00

Create yourself a Comparator like

public class ModifiedComparator implements Comparator<FTPFile> {

  public int compare(FTPFile leftFile, FTPFile rightFile) {
    return leftFile.getTimestamp().compareTo(rightFile.getTimeStamp());
  }
}

From this you have an ordered list

you can just get the last / first twelve items from your list. depending on your order you provide

List<FTPFile> list = Arrays.asList(files);
Collections.sort(list, new ModifiedComparator());

EDIT

public class LastModifiedComparator implements Comparator<FTPFile> {

  public int compare(FTPFile leftFile, FTPFile rightFile) {
    return -leftFile.getTimestamp().compareTo(rightFile.getTimeStamp());
  }
}

List<FTPFile> list = Arrays.asList(files);
Collections.sort(list, new LastModifiedComparator());

You can use this method getLastNoOfFiles(list,12) which will return the number of files you want.

private List<FTPFile> getLastNoOfFiles(List<FTPFile> files, int noOfFilesToGet)
{
  List<FTPFile> latestFiles =  new ArrayList<FTPFile>();

   int index = 1;
  for (FTPFile file : files)
  {
    if (noOfFilesToGet < index)
    {
      break;
    }
    latestFiles.add(file);
    index ++;
  }
  return latestFiles;
}

TechQA.

How to get the twelve latest file in ftp server using ftp client in JAVA

There are 1 answers

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