1、添加pom依賴

<dependency>
　　<groupId>com.jcraft</groupId>
　　<artifactId>jsch</artifactId>
　　<version>0.1.55</version>
</dependency>

2、示例代碼

public static void main(String[] args) throws IOException {
    try {
        // 初始化JSch對象
        JSch jsch = new JSch();
        // 創建一個會話，設置用戶名、主機IP和端口（默認22）
        Session session = jsch.getSession("用戶名", "ip", 22);
        // 設置密碼（也可以使用key-based authentication）
        session.setPassword("密碼");
        // 設置第一次登陸時提示，可選值：(ask | yes | no)
        Properties config = new Properties();
        config.put("StrictHostKeyChecking", "no");
        session.setConfig(config);
        // 建立連接
        session.connect();
        // 創建一個SFTP通道
        Channel channel = session.openChannel("sftp");
        channel.connect();
        // 獲取SFTP客戶端
        ChannelSftp sftpClient = (ChannelSftp) channel;
        // 準備本地文件夾路徑與遠程目標路徑
        String localFolderPath = "E:/目錄/";
        String remoteDirPath = "/data/transfer/";
        File localFolder = new File(localFolderPath);
        if (localFolder.isDirectory()) {
            uploadFolder(sftpClient, localFolderPath, remoteDirPath);
        } else {
            System.out.println(localFolderPath + " is not a directory.");
        }
        // 關閉資源
        sftpClient.quit();
        session.disconnect();

    } catch (JSchException | SftpException | FileNotFoundException e) {
        e.printStackTrace();
    }
}

private static void uploadFolder(ChannelSftp sftpClient, String localFolderPath, String remoteDirPath) throws SftpException, IOException {
    File localFolder = new File(localFolderPath);
    File[] files = localFolder.listFiles();
    if (files != null) {
        for (File file : files) {
            if (file.isDirectory()) {
                // 如果是目錄，則在遠程服務器上創建對應目錄并遞歸上傳
                String newRemoteDirPath = remoteDirPath + file.getName() + "/";
                sftpClient.mkdir(newRemoteDirPath);
                uploadFolder(sftpClient, file.getAbsolutePath(), newRemoteDirPath);
            } else {
                // 如果是文件，則上傳到遠程服務器
                String localFilePath = file.getAbsolutePath();
                String remoteFilePath = remoteDirPath + file.getName();
                FileInputStream fis = new FileInputStream(file);
                sftpClient.put(fis, remoteFilePath);
                fis.close();
            }
        }
    }
}