SFTP工具类根据url下载图片、视频或其他文件的Java代码示例，其中包含中文注释

很高兴回答您的问题，以下是一个简单的Java代码示例用于下载文件，其中包含了中文注释和使用SFTP协议的示例：

import com.jcraft.jsch.*;

import java.io.*;

public class SFTPDownloader {

    public static void downloadFile(String host, int port, String username,
                                     String password, String remoteFilePath, String localFilePath)
            throws JSchException, SftpException, IOException {

        JSch jsch = new JSch();
        Session session = jsch.getSession(username, host, port);

        // 设置密码
        session.setPassword(password);

        // 不验证主机密钥
        session.setConfig("StrictHostKeyChecking", "no");
        session.connect();

        ChannelSftp channelSftp = (ChannelSftp) session.openChannel("sftp");
        channelSftp.connect();

        // 下载文件
        InputStream inputStream = channelSftp.get(remoteFilePath);
        OutputStream outputStream = new FileOutputStream(new File(localFilePath));

        byte[] buffer = new byte[1024];
        int bytesRead = -1;

        while ((bytesRead = inputStream.read(buffer)) != -1) {
            outputStream.write(buffer, 0, bytesRead);
        }

        outputStream.close();
        inputStream.close();
        channelSftp.disconnect();
        session.disconnect();
    }

    public static void main(String[] args) {
        try {
            String host = "example.com";
            int port = 22;
            String username = "username";
            String password = "password";
            String remoteFilePath = "/remote/path/to/file.jpg";
            String localFilePath = "/local/path/to/file.jpg";

            downloadFile(host, port, username, password, remoteFilePath, localFilePath);
            System.out.println("文件下载完成！");
        } catch (Exception e) {
            System.out.println("文件下载失败：" + e.getMessage());
        }
    }
}

希望这个例子可以帮助你实现你的交互式程序。