spring boot　连接FTP实现文件上传

maven：

        <!--ftp--><dependency><groupId>commons-net</groupId><artifactId>commons-net</artifactId><version>3.8.0</version></dependency>

接口示例：

    @ApiOperation(value="上传文件到FTP")@PostMapping("/fileUploadFTP")public Boolean uploadFileToFtp(@RequestParam("file") MultipartFile file) {boolean flag = uploadFile("192.168.2.128",21,file,"user","123456","/");return false;}

方法：

public static boolean uploadFile(String url, int port, MultipartFile file,String username,String password, String path) {FTPClient ftpClient = new FTPClient();boolean result = false;try {String filename = file.getOriginalFilename();// 连接到FTP服务器ftpClient.connect(url, port);// 登录boolean login = ftpClient.login(username, password);if (!login) {System.out.println("FTP 登录失败");return result;}// 设置控制编码（处理中文文件名）ftpClient.setControlEncoding("UTF-8");// 检查是否成功连接int replyCode = ftpClient.getReplyCode();if (!FTPReply.isPositiveCompletion(replyCode)) {System.out.println("连接失败，FTP 服务器返回错误：" + replyCode);return result;}// 切换到指定的目录boolean changeDir = ftpClient.changeWorkingDirectory(path);if (!changeDir) {System.out.println("目标目录不存在或没有权限：" + path);// 尝试创建目标目录if (ftpClient.makeDirectory(path)) {System.out.println("创建目录成功：" + path);} else {System.out.println("无法创建目录：" + path);return false;}}// 设置文件类型（二进制文件类型，适用于所有类型的文件）ftpClient.setFileType(FTP.BINARY_FILE_TYPE);try (InputStream fis = file.getInputStream()) {// 上传文件String encodedFilename = new String(filename.getBytes("UTF-8"), "ISO-8859-1");result = ftpClient.storeFile(encodedFilename, fis);if (result) {System.out.println("文件上传成功!");} else {replyCode = ftpClient.getReplyCode();String replyMessage = ftpClient.getReplyString();System.out.println("上传失败，FTP 回复： " + replyCode + " " + replyMessage);}}// 退出ftpClient.logout();} catch (IOException e) {e.printStackTrace();} finally {try {// 断开与服务器的连接if (ftpClient.isConnected()) {ftpClient.disconnect();}} catch (IOException e) {e.printStackTrace();}}return result;}