java sftp 工具类

您好！如果您想要使用Java进行SFTP操作，可以使用JSch库来实现。下面是一个示例的SFTP工具类，帮助您进行SFTP文件传输：

import com.jcraft.jsch.*;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.Properties;

public class SftpUtils {

    private String host;
    private int port;
    private String username;
    private String password;

    public SftpUtils(String host, int port, String username, String password) {
        this.host = host;
        this.port = port;
        this.username = username;
        this.password = password;
    }

    public void uploadFile(String localFilePath, String remoteFilePath) throws JSchException, SftpException {
        JSch jsch = new JSch();
        Session session = jsch.getSession(username, host, port);
        session.setPassword(password);

        Properties config = new Properties();
        config.put("StrictHostKeyChecking", "no");
        session.setConfig(config);

        session.connect();

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

        File localFile = new File(localFilePath);
        FileInputStream fis = new FileInputStream(localFile);

        channel.put(fis, remoteFilePath);

        fis.close();
        channel.disconnect();
        session.disconnect();
    }

    public void downloadFile(String remoteFilePath, String localFilePath) throws JSchException, SftpException {
        JSch jsch = new JSch();
        Session session = jsch.getSession(username, host, port);
        session.setPassword(password);

        Properties config = new Properties();
        config.put("StrictHostKeyChecking", "no");
        session.setConfig(config);

        session.connect();

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

        File localFile = new File(localFilePath);
        FileOutputStream fos = new FileOutputStream(localFile);

        channel.get(remoteFilePath, fos);

        fos.close();
        channel.disconnect();
        session.disconnect();
    }

    public static void main(String[] args) {
        String host = "your_sftp_host";
        int port = 22;
        String username = "your_username";
        String password = "your_password";

        String localFilePath = "local_file_path";
        String remoteFilePath = "remote_file_path";

        SftpUtils sftpUtils = new SftpUtils(host, port, username, password);
        
        try {
            // 上传文件
            sftpUtils.uploadFile(localFilePath, remoteFilePath);

            // 下载文件
            // sftpUtils.downloadFile(remoteFilePath, localFilePath);
        } catch (JSchException | SftpException e) {
            e.printStackTrace();
        }
    }
}

您可以根据实际情况修改主机地址、端口、用户名、密码，以及本地文件路径和远程文件路径，然后在`main`方法中调用相关方法进行SFTP文件上传或下载。

请确保将JSch库添加到您的项目依赖中。希望对您有所帮助！如果有任何问题，请随时提问。