Как получить двенадцать последних файлов на ftp-сервере с помощью ftp-клиента в JAVA

Я хочу прочитать 12 двенадцать последних файлов XML на FTP-сервере с помощью FTP-клиента, но я получаю только последний и последний.Как получить двенадцать последних файлов на ftp-сервере с помощью ftp-клиента в JAVA

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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Connection close

источник

2015-06-17 Wroyce Misa

Создать себе Comparator как

public class ModifiedComparator implements Comparator<FTPFile> { 

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

От этого у вас есть упорядоченный список

вы можете просто получить последние/первые двенадцать элементов из списка. в зависимости от вашего заказа вы предоставляете

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

РЕДАКТИРОВАНИЕ

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());

Вы можете использовать этот метод getLastNoOfFiles(list,12) который будет возвращать количество файлов, которые вы хотите.

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; 
}

источник

2015-06-17 05:58:00

, но каждые 5 минут файл на ftp-сервере изменяется. Спасибо за ответ Kenneth Clark :) –

Похоже, вам действительно нужно проверить серверную сторону, иначе вам нужно будет подключать и сканировать файлы каждые 5 минут ... –

Фактически, используя мой код, я всегда получаю последний последний файл каждые 5 минут, но моя проблема в том, что я не смогу получить последние двенадцать последних файлов. –

Как получить двенадцать последних файлов на ftp-сервере с помощью ftp-клиента в JAVA

ответ

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