Java Spring上传文件到FTP服务器

import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

@Service
public class FTPService {

    private static final String FTP_SERVER = "ftp.example.com";
    private static final int FTP_PORT = 21;
    private static final String FTP_USERNAME = "username";
    private static final String FTP_PASSWORD = "password";

    public void uploadFileToFTP(MultipartFile file) {
        FTPClient ftpClient = new FTPClient();
        try {
            ftpClient.connect(FTP_SERVER, FTP_PORT);
            ftpClient.login(FTP_USERNAME, FTP_PASSWORD);
            ftpClient.enterLocalPassiveMode();
            ftpClient.setFileType(FTP.BINARY_FILE_TYPE);

            String fileName = file.getOriginalFilename();
            InputStream inputStream = file.getInputStream();

            ftpClient.storeFile(fileName, inputStream);
            inputStream.close();

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