一、SpringBoot模拟文件上传，下载
上传：文件前端传入，后端获取到文件通过输出流写入文件
下载：获取到文件路径，通过输入流读取，在通过输出流写入文件实现下载
#文件上传大小配置 单个文件大小 总的文件大小spring.servlet.multipart.max-file-size=10MBspring.servlet.multipart.max-request-size=100MB
org.springframework.boot spring-boot-starter-web
import lombok.extern.slf4j.Slf4j;import org.springframework.stereotype.Controller;import org.springframework.util.ClassUtils;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.PostMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.multipart.MultipartFile;import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServletResponse;import java.io.*;import java.net.URLEncoder;/** * @author: 清峰 * @date: 2020/11/1 18:31 * @code: 愿世间永无Bug! * @description: 文件上传与下载 (伪下载 文件读写的过程) * 上传：文件前端传入，后端获取到文件通过输出流写入文件 * 下载：获取到文件路径，通过输入流读取，在通过输出流写入文件实现下载 * * 真正实现文件上传服务器(使用ftp协议 文件传输协议 网络访问传输协议) * 也可以获取项目的相对路径在项目下(项目部署在了服务器上)创建一个文件夹用于保存文件，上传的文件保存在项目路径下即可(还可以将路径保存到数据库中http://localhost:8080/file/XXX) * 下载的话：前端文件名展示，指定文件下载获取到文件名，找到路径进行文件读取写入到客户端 */@Slf4j //lombok提供的日志注解可直接调用 log的方法@[email protected]("/file")public class FileUploadController { @PostMapping("/upload") public void upload(@RequestParam("file") MultipartFile file) throws IOException {// String realPath = req.getSession().getServletContext().getRealPath("/uploadFile"); // 放在static下的原因是，存放的是静态文件资源，即通过浏览器输入本地服务器地址，加文件名时是可以访问到的// String path = ClassUtils.getDefaultClassLoader().getResource("").getPath()+"static/"; File targetFile = new File("C:甥敳獲ASUSDesktopfile"); if (!targetFile.exists()) { targetFile.mkdirs(); } FileOutputStream bos = null; try { String str = targetFile + "" + file.getOriginalFilename(); //C:甥敳獲ASUSDesktopfilebg.jpg log.info(str); bos = new FileOutputStream(str);//FileOutputStream读取流的时候如果是文件夹，就会出错，无论怎么读，都拒绝访问，应该在读取的目录后面加上文件名 bos.write(file.getBytes()); //前端文件传过来后端将文件通过流写入文件夹中 } catch (FileNotFoundException e) { e.printStackTrace(); } finally { bos.flush(); bos.close(); } log.info("上传成功"); } @GetMapping("/download") public void download(HttpServletResponse response) throws IOException { FileInputStream fis = null; ServletOutputStream os = null; try { String filename = "bg.jpg"; String filePath = "C:甥敳獲ASUSDesktopfile" + filename; File file = new File(filePath); if (file.exists()) { //响应头的下载内容格式 response.setContentType("application/octet-stream"); response.setHeader("content-type", "application/octet-stream"); response.setHeader("Content-Disposition", "attachment;fileName=" + URLEncoder.encode(filename, "utf8")); fis = new FileInputStream(file); byte[] bytes = new byte[1024]; os = response.getOutputStream();// FileOutputStream os = new FileOutputStream(new File("C:甥敳獲ASUSDesktop"+filename)); int i = fis.read(bytes); //从文件夹中读取文件通过流写入指定文件中 while (i != -1) { os.write(bytes); i = fis.read(bytes); } } } catch (IOException e) { e.printStackTrace(); } finally { os.close(); fis.close(); } log.info("下载成功"); }}
二、SpringBoot实现文件上传至远程服务器(ftp)
FTP服务器(File Transfer Protocol Server)是在互联网上提供文件存储和访问服务的计算机，它们依照FTP协议提供服务。FTP是File Transfer Protocol(文件传输协议)。顾名思义，就是专门用来传输文件的协议。简单地说，支持FTP协议的服务器就是FTP服务器。
FTP是用来在两台计算机之间传输文件，是Internet中应用非常广泛的服务之一。它可根据实际需要设置各用户的使用权限，同时还具有跨平台的特性，快速方便地上传、下载文件。
commons-net commons-net 3.6 log4j log4j 1.2.17
import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.util.TimeZone;import org.apache.commons.net.ftp.FTPClient;import org.apache.commons.net.ftp.FTPClientConfig;import org.apache.commons.net.ftp.FTPFile;import org.apache.commons.net.ftp.FTPReply;import org.apache.log4j.Logger;/** * @author: 清峰 * @date: 2020/11/2 9:30 * @code: 愿世间永无Bug! * @description: */public class Ftp { private FTPClient ftpClient; private String strIp; private int intPort; private String user; private String password; private static Logger logger = Logger.getLogger(Ftp.class.getName()); /* * * Ftp构造函数 */ public Ftp(String strIp, int intPort, String user, String Password) { this.strIp = strIp; this.intPort = intPort; this.user = user; this.password = Password; this.ftpClient = new FTPClient(); } /** * @return 判断是否登入成功 */ public boolean ftpLogin() { boolean isLogin = false; FTPClientConfig ftpClientConfig = new FTPClientConfig(); ftpClientConfig.setServerTimeZoneId(TimeZone.getDefault().getID()); this.ftpClient.setControlEncoding("GBK"); this.ftpClient.configure(ftpClientConfig); try { if (this.intPort > 0) { this.ftpClient.connect(this.strIp, this.intPort); } else { this.ftpClient.connect(this.strIp); } // FTP服务器连接回答 int reply = this.ftpClient.getReplyCode(); if (!FTPReply.isPositiveCompletion(reply)) { this.ftpClient.disconnect(); logger.error("登录FTP服务失败！"); return isLogin; } this.ftpClient.login(this.user, this.password); // 设置传输协议 this.ftpClient.enterLocalPassiveMode(); this.ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE); logger.info("恭喜" + this.user + "成功登陆FTP服务器"); isLogin = true; } catch (Exception e) { e.printStackTrace(); logger.error(this.user + "登录FTP服务失败！" + e.getMessage()); } this.ftpClient.setBufferSize(1024 * 2); this.ftpClient.setDataTimeout(30 * 1000); return isLogin; } /** * @退出关闭服务器链接 */ public void ftpLogOut() { if (null != this.ftpClient && this.ftpClient.isConnected()) { try { boolean reuslt = this.ftpClient.logout();// 退出FTP服务器 if (reuslt) { logger.info("成功退出服务器"); } } catch (IOException e) { e.printStackTrace(); logger.warn("退出FTP服务器异常！" + e.getMessage()); } finally { try { this.ftpClient.disconnect();// 关闭FTP服务器的连接 } catch (IOException e) { e.printStackTrace(); logger.warn("关闭FTP服务器的连接异常！"); } } } } /*** * 上传Ftp文件 * @param localFile 当地文件 * romotUpLoadePath上传服务器路径 - 应该以/结束 * */ public boolean uploadFile(File localFile, String romotUpLoadePath) { BufferedInputStream inStream = null; boolean success = false; try { this.ftpClient.changeWorkingDirectory(romotUpLoadePath);// 改变工作路径 inStream = new BufferedInputStream(new FileInputStream(localFile)); logger.info(localFile.getName() + "开始上传....."); success = this.ftpClient.storeFile(localFile.getName(), inStream); if (success == true) { logger.info(localFile.getName() + "上传成功"); return success; } } catch (FileNotFoundException e) { e.printStackTrace(); logger.error(localFile + "未找到"); } catch (IOException e) { e.printStackTrace(); } finally { if (inStream != null) { try { inStream.close(); } catch (IOException e) { e.printStackTrace(); } } } return success; } /*** * 下载文件 * @param remoteFileName 待下载文件名称 * @param localDires 下载到当地那个路径下 * @param remoteDownLoadPath remoteFileName所在的路径 * */ public boolean downloadFile(String remoteFileName, String localDires, String remoteDownLoadPath) { String strFilePath = localDires + remoteFileName; BufferedOutputStream outStream = null; boolean success = false; try { this.ftpClient.changeWorkingDirectory(remoteDownLoadPath); outStream = new BufferedOutputStream(new FileOutputStream( strFilePath)); logger.info(remoteFileName + "开始下载...."); success = this.ftpClient.retrieveFile(remoteFileName, outStream); if (success == true) { logger.info(remoteFileName + "成功下载到" + strFilePath); return success; } } catch (Exception e) { e.printStackTrace(); logger.error(remoteFileName + "下载失败"); } finally { if (null != outStream) { try { outStream.flush(); outStream.close(); } catch (IOException e) { e.printStackTrace(); } } } if (success == false) { logger.error(remoteFileName + "下载失败!!!"); } return success; } /*** * @上传文件夹 * @param localDirectory * 当地文件夹 * @param remoteDirectoryPath * Ftp 服务器路径 以目录"/"结束 * */ public boolean uploadDirectory(String localDirectory, String remoteDirectoryPath) { File src = new File(localDirectory); try { remoteDirectoryPath = remoteDirectoryPath + src.getName() + "/"; this.ftpClient.makeDirectory(remoteDirectoryPath); // ftpClient.listDirectories(); } catch (IOException e) { e.printStackTrace(); logger.info(remoteDirectoryPath + "目录创建失败"); } File[] allFile = src.listFiles(); for (int currentFile = 0; currentFile
import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.util.TimeZone;import org.apache.commons.net.ftp.FTPClient;import org.apache.commons.net.ftp.FTPClientConfig;import org.apache.commons.net.ftp.FTPFile;import org.apache.commons.net.ftp.FTPReply;import org.apache.log4j.Logger;/** * @author: 清峰 * @date: 2020/11/2 9:30 * @code: 愿世间永无Bug! * @description: */public class Ftp { private FTPClient ftpClient; private String strIp; private int intPort; private String user; private String password; private static Logger logger = Logger.getLogger(Ftp.class.getName()); /* * * Ftp构造函数 */ public Ftp(String strIp, int intPort, String user, String Password) { this.strIp = strIp; this.intPort = intPort; this.user = user; this.password = Password; this.ftpClient = new FTPClient(); } /** * @return 判断是否登入成功 */ public boolean ftpLogin() { boolean isLogin = false; FTPClientConfig ftpClientConfig = new FTPClientConfig(); ftpClientConfig.setServerTimeZoneId(TimeZone.getDefault().getID()); this.ftpClient.setControlEncoding("GBK"); this.ftpClient.configure(ftpClientConfig); try { if (this.intPort > 0) { this.ftpClient.connect(this.strIp, this.intPort); } else { this.ftpClient.connect(this.strIp); } // FTP服务器连接回答 int reply = this.ftpClient.getReplyCode(); if (!FTPReply.isPositiveCompletion(reply)) { this.ftpClient.disconnect(); logger.error("登录FTP服务失败！"); return isLogin; } this.ftpClient.login(this.user, this.password); // 设置传输协议 this.ftpClient.enterLocalPassiveMode(); this.ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE); logger.info("恭喜" + this.user + "成功登陆FTP服务器"); isLogin = true; } catch (Exception e) { e.printStackTrace(); logger.error(this.user + "登录FTP服务失败！" + e.getMessage()); } this.ftpClient.setBufferSize(1024 * 2); this.ftpClient.setDataTimeout(30 * 1000); return isLogin; } /** * @退出关闭服务器链接 */ public void ftpLogOut() { if (null != this.ftpClient && this.ftpClient.isConnected()) { try { boolean reuslt = this.ftpClient.logout();// 退出FTP服务器 if (reuslt) { logger.info("成功退出服务器"); } } catch (IOException e) { e.printStackTrace(); logger.warn("退出FTP服务器异常！" + e.getMessage()); } finally { try { this.ftpClient.disconnect();// 关闭FTP服务器的连接 } catch (IOException e) { e.printStackTrace(); logger.warn("关闭FTP服务器的连接异常！"); } } } } /*** * 上传Ftp文件 * @param localFile 当地文件 * romotUpLoadePath上传服务器路径 - 应该以/结束 * */ public boolean uploadFile(File localFile, String romotUpLoadePath) { BufferedInputStream inStream = null; boolean success = false; try { this.ftpClient.changeWorkingDirectory(romotUpLoadePath);// 改变工作路径 inStream = new BufferedInputStream(new FileInputStream(localFile)); logger.info(localFile.getName() + "开始上传....."); success = this.ftpClient.storeFile(localFile.getName(), inStream); if (success == true) { logger.info(localFile.getName() + "上传成功"); return success; } } catch (FileNotFoundException e) { e.printStackTrace(); logger.error(localFile + "未找到"); } catch (IOException e) { e.printStackTrace(); } finally { if (inStream != null) { try { inStream.close(); } catch (IOException e) { e.printStackTrace(); } } } return success; } /*** * 下载文件 * @param remoteFileName 待下载文件名称 * @param localDires 下载到当地那个路径下 * @param remoteDownLoadPath remoteFileName所在的路径 * */ public boolean downloadFile(String remoteFileName, String localDires, String remoteDownLoadPath) { String strFilePath = localDires + remoteFileName; BufferedOutputStream outStream = null; boolean success = false; try { this.ftpClient.changeWorkingDirectory(remoteDownLoadPath); outStream = new BufferedOutputStream(new FileOutputStream( strFilePath)); logger.info(remoteFileName + "开始下载...."); success = this.ftpClient.retrieveFile(remoteFileName, outStream); if (success == true) { logger.info(remoteFileName + "成功下载到" + strFilePath); return success; } } catch (Exception e) { e.printStackTrace(); logger.error(remoteFileName + "下载失败"); } finally { if (null != outStream) { try { outStream.flush(); outStream.close(); } catch (IOException e) { e.printStackTrace(); } } } if (success == false) { logger.error(remoteFileName + "下载失败!!!"); } return success; } /*** * @上传文件夹 * @param localDirectory * 当地文件夹 * @param remoteDirectoryPath * Ftp 服务器路径 以目录"/"结束 * */ public boolean uploadDirectory(String localDirectory, String remoteDirectoryPath) { File src = new File(localDirectory); try { remoteDirectoryPath = remoteDirectoryPath + src.getName() + "/"; this.ftpClient.makeDirectory(remoteDirectoryPath); // ftpClient.listDirectories(); } catch (IOException e) { e.printStackTrace(); logger.info(remoteDirectoryPath + "目录创建失败"); } File[] allFile = src.listFiles(); for (int currentFile = 0; currentFile
版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。
本文链接：
https://blog.csdn.net/weixin_45019350/article/details/109443761
![bat 判断文件名字含有某些字段_正确处理下载文件时HTTP头的编码问题（ContentDisposition）...[图]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)