依赖

        <!-- https://mvnrepository.com/artifact/com.jcraft/jsch -->
        <dependency>
            <groupId>com.jcraft</groupId>
            <artifactId>jsch</artifactId>
            <version>0.1.55</version>
        </dependency>

代码

package com.cyz;
import com.jcraft.jsch.*;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.Properties;
/**
 * @author cyz
 * @since 2024/6/6 下午3:50
 */
public class TestFtp {
    static String server = "192.168.1.174";
    static int port = 22;
    static String user = "root";
    static String pass = "2023#111";
    private static ChannelSftp sftp = null;
    static Channel channel = null;
    static Session sshSession = null;
    public static void main(String[] args) {
        connect(server, user, pass, port);
        put("/export/home/ftp/syncFile", new File("C:\\develop\\codes\\mycode\\callwebservicetest\\src\\main\\resources\\a.txt"));
        logout();
    }

    public static void connect(String server, String username, String password, int port) {
        System.out.println("FtpClient connect to server: ip[{" + server + "}], username:[{" + username + "}], password:[{" + password + "}], port:[{" + port + "}]");
        try {
            JSch jsch = new JSch();
            jsch.getSession(username, server, port);
            sshSession = jsch.getSession(username, server, port);
            sshSession.setPassword(password);
            Properties sshConfig = new Properties();
            sshConfig.put("StrictHostKeyChecking", "no");
            sshSession.setConfig(sshConfig);
            sshSession.connect();
            channel = sshSession.openChannel("sftp");
            channel.connect();
            sftp = (ChannelSftp) channel;
            System.out.println("connect success!");
        } catch (JSchException e) {
            e.printStackTrace();
            throw new RuntimeException("FTP服务器连接失败", e);
        }
    }

    public static void put(String remotePath, File file) {
        System.out.println("FtpClient put [{" + file.getAbsolutePath() + "}] to [{" + remotePath + "}] ]");
        FileInputStream inputStream = null;
        try {
            sftp.cd(remotePath);
            inputStream = new FileInputStream(file);
            sftp.put(inputStream, file.getName());
            System.out.println("upload [" + file.getName() + "]  success!");
        } catch (FileNotFoundException e) {
            System.out.println("FileNotFoundException" + e.getMessage());
            throw new RuntimeException("文件不存在", e);
        } catch (SftpException e) {
            System.out.println("SftpException" + e.getMessage());
            throw new RuntimeException("上传失败", e);
        } finally {
            try {
                if (inputStream != null) {
                    inputStream.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 关闭连接 server
     */
    public static void logout() {
        if (sftp != null) {
            if (sftp.isConnected()) {
                sftp.disconnect();
            }
        }
        if (sshSession != null) {
            if (sshSession.isConnected()) {
                sshSession.disconnect();
            }
        }
        System.out.println("FtpClient logout success!");
    }

}

测试