目录

一、引入依赖

二、配置文件

三、Controller层

四、Service层

五、相关工具类

由于服务在内网部署，需要使用ftp服务器管理文件，总结如下

一、引入依赖

    commons-net
    commons-net
    3.9.0



    cn.hutool
    hutool-all
    5.7.22

Tip：使用commons-net 3.9.0版本，之前的版本有漏洞

二、配置文件

ftp:
  basePath: /
  host: 192.168.1.100
  httpPath: ftp://192.168.1.100
  password: demo
  port: 21
  username: demo

配置文件类：

package com.example.demo.config;
import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;
/**
 * @Author: meng
 * @Description: ftp配置
 * @Date: 2023/6/30 13:44
 * @Version: 1.0
 */
@Data
@Component
@ConfigurationProperties(prefix = "ftp")
public class FtpProperties {
	/**
	 * ftp服务器的地址
	 */
	private String host;
	/**
	 * ftp服务器的端口号（连接端口号）
	 */
	private String port;
	/**
	 * ftp的用户名
	 */
	private String username;
	/**
	 * ftp的密码
	 */
	private String password;
	/**
	 * ftp上传的根目录
	 */
	private String basePath;
	/**
	 * 回显地址
	 */
	private String httpPath;
}

三、Controller层

Tip：Response为通用返回类，不熟悉的可以看这篇文章：Springboot - 通用返回类BaseResults_W_Meng_H的博客-CSDN博客BaseResults类public class BaseResults { private Integer code; private String message; private T data; public BaseResults() { super(); } public BaseResu...https://blog.csdn.net/W_Meng_H/article/details/104995823

package com.example.demo.controller;
import com.example.demo.service.FtpService;
import com.template.common.core.data.Response;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
 * @Author: meng
 * @Description: 文件服务
 * @Date: 2023/6/30 14:33
 * @Version: 1.0
 */
@RestController
@RequestMapping("/file")
public class FileController {
	@Autowired
	private FtpService ftpService;
	// 单上传文件
	@PostMapping(value = "upload", consumes = "multipart/*", headers = "content-type=multipart/form-data")
	public Response uploadFile(@RequestParam("file") MultipartFile file, HttpServletRequest request) {
		return ftpService.uploadMultipartFile(file, request);
	}
	// 导出文件
	@GetMapping(value = "download")
	public void downloadFile(@RequestParam String fileName, @RequestParam String ftpFilePath, HttpServletResponse response) {
		ftpService.downloadFileToFtp(fileName, ftpFilePath, response);
	}
	// 删除文件
	@GetMapping(value = "delete")
	public Response deleteFile(@RequestParam String ftpFilePath) {
		return ftpService.deleteFileToFtp(ftpFilePath);
	}
}

四、Service层

package com.example.demo.service;
import com.template.common.core.data.Response;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
 * @Author: meng
 * @Description: ftp服务类
 * @Date: 2023/6/30 13:46
 * @Version: 1.0
 */
public interface FtpService {
	/**
	 * 上传文件到ftp
	 * @param multipartFile
	 * @param request
	 * @return
	 */
	public Response uploadMultipartFile(MultipartFile multipartFile, HttpServletRequest request);
	/**
	 * 下载ftp文件，直接转到输出流
	 * @param fileName
	 * @param ftpFilePath
	 * @param response
	 */
	public void downloadFileToFtp(String fileName, String ftpFilePath, HttpServletResponse response);
	/**
	 * 删除ftp文件
	 * @param ftpFilePath ftp下文件路径，根目录开始
	 * @return
	 */
	Response deleteFileToFtp(String ftpFilePath);
}

实现类：

package com.example.demo.service.impl;
import cn.hutool.core.date.DateUtil;
import cn.hutool.core.util.IdUtil;
import cn.hutool.core.util.ObjectUtil;
import cn.hutool.core.util.StrUtil;
import com.example.demo.config.FtpProperties;
import com.example.demo.service.FtpService;
import com.example.demo.tools.FileUtils;
import com.template.common.core.data.Response;
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPReply;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.util.Date;
/**
 * @Author: meng
 * @Description: ftp服务类
 * @Date: 2023/6/30 13:47
 * @Version: 1.0
 */
@Service
public class FtpServiceImpl implements FtpService {
	private Logger logger = LoggerFactory.getLogger(this.getClass());
	@Autowired
	private FtpProperties ftpProperties;
	// 方式一
	@Override
	public Response uploadMultipartFile(MultipartFile multipartFile, HttpServletRequest request) {
		if (multipartFile == null || multipartFile.isEmpty()) {
			return Response.error("没有上传文件");
		}
		//1、获取原文件后缀名
		String originalFileName = multipartFile.getOriginalFilename();
		String suffix = originalFileName.substring(originalFileName.lastIndexOf('.'));
		//2、使用UUID生成新文件名
		String newFileName = IdUtil.fastSimpleUUID();
		//3、将MultipartFile转化为File
		File file = null;
		try {
			// file = FileUtils.multipartFileToFile(multipartFile);
            flag = uploadFileToFtp(multipartFile.getInputStream(), newFileName + suffix, today, ftpClient);
		} catch (Exception e) {
			logger.error("文件上传失败:", e);
			return Response.error("文件上传失败");
		}
		if (ObjectUtil.isNull(file)) {
			return Response.error("文件上传失败");
		}
		//当前日期字符串
		String today = File.separator + DateUtil.format(new Date(), "yyyyMMdd");
		Boolean flag = uploadFileToFtp(file, newFileName + suffix, today);
		if (!flag) {
			return Response.error("文件上传失败");
		}
		System.out.println(file.toURI());
		File f = new File(file.toURI());
		f.delete();
		String filePath = ftpProperties.getHttpPath() + today + File.separator + newFileName + suffix;
		return Response.success(filePath);
	}
	
	// 方式二
	public Response uploadMultipartFile2(MultipartFile multipartFile, HttpServletRequest request) {
		FTPClient ftpClient = connectFtpServer();
		if (multipartFile == null || multipartFile.isEmpty()) {
			return R.error(Constants.FILE_EMPTY);
		}
		//获取原文件后缀名
		String originalFileName = multipartFile.getOriginalFilename();
		String suffix = originalFileName.substring(originalFileName.lastIndexOf('.'));
		//使用UUID生成新文件名
		String newFileName = IdUtil.fastSimpleUUID();
		//当前日期字符串
		String today = separator + DateUtil.date().toString(DATE_FORMAT);
		Boolean flag = false;
		try {
			flag = uploadFileToFtp(multipartFile.getInputStream(), newFileName + suffix, today, ftpClient);
		} catch (Exception e) {
			logger.error("文件上传失败:", e);
		}
		if (!flag) {
			logger.info("文件上传失败");
			return R.error("文件上传失败");
		}
		String filePath = ftpProperties.getHttpPath() + today + File.separator + newFileName + suffix;
		return Response.success(filePath);
	}
	public Boolean uploadFileToFtp(File file, String fileName, String filePath) {
		logger.info("调用文件上传接口");
		// 定义保存结果
		boolean iaOk = false;
		// 初始化连接
		FTPClient ftp = connectFtpServer();
		if (ftp != null) {
			try {
				// 设置文件传输模式为二进制，可以保证传输的内容不会被改变
				ftp.setFileType(FTP.BINARY_FILE_TYPE);
				ftp.enterLocalPassiveMode();    //注：上传文件都为0字节，设置为被动模式即可
				// 跳转到指定路径，逐级跳转，不存在的话就创建再进入
				toPathOrCreateDir(ftp, filePath);
				InputStream inputStream = new FileInputStream(file);
				// 上传文件 参数：上传后的文件名，输入流,,返回Boolean类型，上传成功返回true
				iaOk = ftp.storeFile(fileName, inputStream);
				// 关闭输入流
				inputStream.close();
				// 退出ftp
				ftp.logout();
			} catch (IOException e) {
				logger.error(e.toString());
			} finally {
				if (ftp.isConnected()) {
					try {
						// 断开ftp的连接
						ftp.disconnect();
					} catch (IOException ioe) {
						logger.error(ioe.toString());
					}
				}
			}
		}
		return iaOk;
	}
	@Override
	public void downloadFileToFtp(String fileName, String ftpFilePath, HttpServletResponse response) {
		FTPClient ftpClient = connectFtpServer();
		try {
			ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
			ftpClient.enterLocalPassiveMode();
			// 设置文件ContentType类型，这样设置，会自动判断下载文件类型
			response.setContentType("application/x-msdownload");
			// 设置文件头：最后一个参数是设置下载的文件名并编码为UTF-8
			response.setHeader("Content-Disposition", "attachment;fileName=" + URLEncoder.encode(fileName, "UTF-8"));
			InputStream is = ftpClient.retrieveFileStream(ftpFilePath);
			BufferedInputStream bis = new BufferedInputStream(is);
			OutputStream out = response.getOutputStream();
			byte[] buf = new byte[1024];
			int len = 0;
			while ((len = bis.read(buf)) > 0) {
				out.write(buf, 0, len);
			}
			out.flush();
			out.close();
			if (bis != null) {
				try {
					bis.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			if (is != null) {
				try {
					is.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			ftpClient.logout();
		} catch (Exception e) {
			logger.error("FTP文件下载失败:", e);
		} finally {
			if (ftpClient.isConnected()) {
				try {
					ftpClient.disconnect();
				} catch (IOException ioe) {
					logger.error(ioe.toString());
				}
			}
		}
	}
	@Override
	public Response deleteFileToFtp(String ftpFilePath) {
		FTPClient ftp = connectFtpServer();
		boolean resu = false;
		try {
			resu = ftp.deleteFile(ftpFilePath);
			ftp.logout();
		} catch (Exception e) {
			logger.error("FTP文件删除失败:{}", e);
			return Response.error("文件删除失败");
		} finally {
			if (ftp.isConnected()) {
				try {
					ftp.disconnect();
				} catch (IOException ioe) {
					logger.error(ioe.toString());
				}
			}
		}
		return Response.SUCCESS;
	}
	private FTPClient connectFtpServer() {
		// 创建FTPClient对象（对于连接ftp服务器，以及上传和上传都必须要用到一个对象）
		logger.info("创建FTP连接");
		FTPClient ftpClient = new FTPClient();
		// 设置连接超时时间
		ftpClient.setConnectTimeout(1000 * 60);
		// 设置ftp字符集
		ftpClient.setControlEncoding("utf-8");
		// 设置被动模式，文件传输端口设置,否则文件上传不成功，也不报错
		ftpClient.enterLocalPassiveMode();
		try {
			// 定义返回的状态码
			int replyCode;
			// 连接ftp(当前项目所部署的服务器和ftp服务器之间可以相互通讯，表示连接成功)
			ftpClient.connect(ftpProperties.getHost());
			// 输入账号和密码进行登录
			ftpClient.login(ftpProperties.getUsername(), ftpProperties.getPassword());
			// 接受状态码(如果成功，返回230，如果失败返回503)
			replyCode = ftpClient.getReplyCode();
			// 根据状态码检测ftp的连接，调用isPositiveCompletion(reply)-->如果连接成功返回true，否则返回false
			if (!FTPReply.isPositiveCompletion(replyCode)) {
				logger.info("connect ftp {} failed", ftpProperties.getHost());
				// 连接失败，断开连接
				ftpClient.disconnect();
				return null;
			}
			logger.info("replyCode:" + replyCode);
		} catch (IOException e) {
			logger.error("connect fail:" + e.toString());
			return null;
		}
		return ftpClient;
	}
	private void toPathOrCreateDir(FTPClient ftp, String filePath) throws IOException {
		String[] dirs = filePath.split("/");
		for (String dir : dirs) {
			if (StrUtil.isBlank(dir)) {
				continue;
			}
			if (!ftp.changeWorkingDirectory(dir)) {
				ftp.makeDirectory(dir);
				ftp.changeWorkingDirectory(dir);
			}
		}
	}
}

五、相关工具类

package com.example.demo.tools;
import org.springframework.web.multipart.MultipartFile;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
/**
 * @Author: meng
 * @Description: 文件转换工具类
 * @Date: 2023/6/30 14:13
 * @Version: 1.0
 */
public class FileUtils {
	/**
	 * MultipartFile 转 File
	 * @param file
	 * @throws Exception
	 */
	public static File multipartFileToFile(MultipartFile file) throws Exception {
		File toFile = null;
		if(file.equals("")||file.getSize()<=0){
			file = null;
		}else {
			InputStream ins = null;
			ins = file.getInputStream();
			toFile = new File(file.getOriginalFilename());
			toFile = inputStreamToFile(ins, toFile);
			ins.close();
		}
		return toFile;
	}
	private static File inputStreamToFile(InputStream ins, File file) {
		try {
			OutputStream os = new FileOutputStream(file);
			int bytesRead = 0;
			byte[] buffer = new byte[8192];
			while ((bytesRead = ins.read(buffer, 0, 8192)) != -1) {
				os.write(buffer, 0, bytesRead);
			}
			os.close();
			ins.close();
			return file;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
}