ftpClient获取目录下面文件夹

可以使用FTPClient的listFiles()方法来获取目录下的所有文件和文件夹，然后筛选出文件夹即可。以下是一个示例代码：

import java.io.IOException;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;

public class FTPDemo {
    public static void main(String[] args) {
        String server = "your-ftp-server.com";
        int port = 21;
        String user = "your-ftp-username";
        String password = "your-ftp-password";
        String remotePath = "/your/remote/folder/path";
        
        FTPClient ftpClient = new FTPClient();
        try {
            ftpClient.connect(server, port);
            ftpClient.login(user, password);
            ftpClient.enterLocalPassiveMode();
            ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
            
            FTPFile[] files = ftpClient.listFiles(remotePath);
            for (FTPFile file : files) {
                if (file.isDirectory()) {
                    System.out.println("Found directory: " + file.getName());
                }
            }
            
            ftpClient.logout();
        } catch (IOException ex) {
            ex.printStackTrace();
        } finally {
            if (ftpClient.isConnected()) {
                try {
                    ftpClient.disconnect();
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
            }
        }
    }
}

其中，remotePath为远程目录的路径。如果要获取根目录下的文件夹，则remotePath应该是"/"。