废话不多说，直接上代码，拿去直接可以使用。

如果小伙伴们没有可以测试ftp服务器，可以在自己的本地搭建一套ftp服务，步骤也很简单

传送门：Windows下如何搭建FTP服务并且设置其用户名和密码 (taodudu.cc)

一.引入依赖

    <dependency><groupId>commons-net</groupId><artifactId>commons-net</artifactId><version>3.3</version></dependency>

二.工具类

package com.gstanzer.supervise.utills;import lombok.extern.slf4j.Slf4j;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPReply;import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;/*** @author: tangbingbing* @date: 2023/8/11 14:16*/
@Slf4j
public class FTPUtils {/*** 上传文件** @param fileName    上传到FTP服务器后的文件名称* @param inputStream 输入文件流* @return*/public static boolean creatFileFTP(String hostname, int port, String username, String password, String pathname, String fileName, InputStream inputStream) {boolean flag = false;FTPClient ftpClient = new FTPClient();//设置超时ftpClient.setConnectTimeout(60 * 60 * 1000);//设置编码ftpClient.setControlEncoding("UTF-8");try {//连接FTP服务器ftpClient.connect(hostname, port);//登录FTP服务器ftpClient.login(username, password);//是否成功登录FTP服务器int replyCode = ftpClient.getReplyCode();if (!FTPReply.isPositiveCompletion(replyCode)) {return flag;}log.info("===========登录FTP成功==============");ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);//切换路径 创建路径ftpClient.makeDirectory(pathname);ftpClient.changeWorkingDirectory(pathname);ftpClient.enterLocalPassiveMode();//            String pathDir1 = pathname+df.format(new Date());
//            boolean pathIsExis = ftpClient.changeWorkingDirectory(pathDir1);
//            log.info("查看文件夹是否存在");
//            if(!pathIsExis){//不存在文件夹则创建并且进入文件夹
//                ftpClient.makeDirectory(pathDir1);
//                ftpClient.changeWorkingDirectory(pathDir1);
//            }//设置缓冲ftpClient.setBufferSize(1024 * 1024 * 20);//保持连接ftpClient.setKeepAlive(true);boolean a = ftpClient.storeFile(new String(fileName.getBytes(StandardCharsets.UTF_8), StandardCharsets.ISO_8859_1), inputStream);if (a) {flag = true;log.info("===========文件创建成功==============");} else {flag = false;}inputStream.close();ftpClient.logout();flag = true;} catch (Exception e) {e.printStackTrace();} finally {if (ftpClient.isConnected()) {try {ftpClient.disconnect();} catch (IOException e) {e.printStackTrace();}}}return flag;}/*** 生成写入文件** @param data 文件内容* @return*/public static InputStream write(String data) {InputStream input = new ByteArrayInputStream(data.getBytes(StandardCharsets.UTF_8));return input;}public static void main(String[] args) {String data = "中文 data1\n中文 data2";InputStream in = write(data);boolean b = creatFileFTP("127.0.0.1", 21, "user", "pwd", "/", "test.txt", in);if (b) {System.out.println("文件生成并上传成功");}}
}