使用java ftp检查using上是否存在数据集

import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;

public class FTPCheckDataset {
    public static void main(String[] args) {
        String server = "ftp.example.com";
        int port = 21;
        String username = "your-username";
        String password = "your-password";
        String usingDirectory = "/using";
        String targetDataset = "dataset.txt";

        FTPClient ftpClient = new FTPClient();
        try {
            ftpClient.connect(server, port);
            ftpClient.login(username, password);
            ftpClient.enterLocalPassiveMode();
            ftpClient.setFileType(FTP.BINARY_FILE_TYPE);

            boolean success = ftpClient.changeWorkingDirectory(usingDirectory);
            if (success) {
                FTPFile[] files = ftpClient.listFiles();
                boolean datasetExists = false;
                for (FTPFile file : files) {
                    if (file.getName().equals(targetDataset)) {
                        datasetExists = true;
                        break;
                    }
                }

                if (datasetExists) {
                    System.out.println("数据集存在");
                } else {
                    System.out.println("数据集不存在");
                }
            } else {
                System.out.println("切换到using目录失败");
            }

            ftpClient.logout();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (ftpClient.isConnected()) {
                try {
                    ftpClient.disconnect();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }
}