SpringBoot实现文件上传、下载到服务器

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SpringBoot实现文件上传、下载到服务器

2023-07-24 17:21| 来源: 网络整理| 查看: 265

文章目录 一、SpringBoot实现文件上传,下载1、文件上传:2、文件下载 二、SpringBoot实现文件上传至远程服务器(ftp)

通过一个小项目实现文件的上传、下载,在线打开与文件删除,并将文件的信息保存到数据库中。 所用技术:SpringBoot+thymeleaf+Mybatis 小项目地址:https://github.com/lindaifeng/MyFileUpload

页面没有任何花里胡哨的东西,只用于做数据展示用,主要关注于后端代码的实现。 用户登录后进入首页展示该用户上传的文件信息,并可以进行文件上传,下载,删除,注销和在线打开功能,文件被保存在项目的指定路径下,文件信息保存在了数据库中。

在这里插入图片描述

一、SpringBoot实现文件上传,下载 1、文件上传:

文件前端传入,后端获取到文件通过输出流写入文件。

上传的主要核心是ResourceUtils获取项目的相对路径,然后通过文件的transferTo方法保存到指定路径的文件夹下

#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=10MB spring.servlet.multipart.max-request-size=100MB org.springframework.boot spring-boot-starter-web @PostMapping("/upload") public String upload(HttpSession session, @RequestParam("file") MultipartFile file, RedirectAttributes attributes) throws IOException { System.out.println("准备上传"); if (file.isEmpty()) { attributes.addFlashAttribute("msg", "上传的文件不能为空"); return "redirect:/files/fileAll"; } //获取原始文件名称 String originalFilename = file.getOriginalFilename(); //获取文件后缀名 String extension = "." + FilenameUtils.getExtension(originalFilename); //.jpg //获取新文件名称 命名:时间戳+UUID+后缀 String newFileName = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date()) + UUID.randomUUID().toString().substring(0, 4) + extension; //获取资源路径 classpath的项目路径+/static/files classpath就是resources的资源路径 String path = ResourceUtils.getURL("classpath:").getPath() + "static/files/"; //新建一个时间文件夹标识,用来分类 String format = new SimpleDateFormat("yyyy-MM-dd").format(new Date()); //全路径(存放资源的路径) 资源路径+时间文件夹标识 String dataDir = path + format; System.out.println(dataDir); //全路径存放在文件类中,判断文件夹是否存在不存在就创建 File dataFile = new File(dataDir); //也可以直接放进去进行拼接 File dataFile = new File(path,format); if (!dataFile.exists()) { dataFile.mkdirs(); } //文件上传至指定路径 file.transferTo(new File(dataFile, newFileName)); //文件信息保存到数据库 //获取文件格式 String type = file.getContentType(); //获取文件大小 long size = file.getSize(); //封装进实体类 fileUpload.setOldFileName(originalFilename); fileUpload.setNewFileName(newFileName); fileUpload.setExt(extension); fileUpload.setPath("/files/" + format); fileUpload.setGlobalPath(dataDir); fileUpload.setDownCounts(0); fileUpload.setType(type); fileUpload.setSize(size); fileUpload.setUploadTime(new Date()); User user = (User) session.getAttribute("user"); fileUpload.setUserId(user.getId()); boolean img = type.startsWith("image");//检测字符串是否以指定的前缀开始 if (img) { fileUpload.setIsImg("是"); } else { fileUpload.setIsImg("否"); } System.out.println(fileUpload); int b = fileUploadService.saveFile(fileUpload); System.out.println(b); if (b == 1) { attributes.addFlashAttribute("msg", "保存成功!"); } else { attributes.addFlashAttribute("msg", "保存失败!"); } System.out.println("上传结束"); return "redirect:/files/fileAll"; } 2、文件下载

下载:获取到文件路径,通过输入流读取,再获取响应输出流,通过工具类中的拷贝方法IOUtils.copy()实现在线打开,通过附件形式实现文件下载。(前提是需要依赖包才能使用IOUtils工具类)

commons-fileupload commons-fileupload 1.4

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@GetMapping("/download") public void download(Integer id, String openStyle, HttpServletResponse response) throws IOException { FileUpload fileUpload = fileUploadService.findFileById(id); //获取全路径 // String globalPath = ResourceUtils.getURL("classpath:").getPath() + "static" + fileUpload.getPath() + "/"; String globalPath = fileUpload.getGlobalPath(); System.out.println(globalPath); FileInputStream fis = new FileInputStream(new File(globalPath, fileUpload.getNewFileName())); //根据传过来的参数判断是下载,还是在线打开 if ("attachment".equals(openStyle)) { //并更新下载次数 fileUpload.setDownCounts(fileUpload.getDownCounts() + 1); fileUploadService.updateFileDownCounts(id, fileUpload.getDownCounts()); //以附件形式下载 点击会提供对话框选择另存为: response.setHeader("content-disposition", "attachment;filename=" + URLEncoder.encode(fileUpload.getOldFileName(), "utf-8")); } //获取输出流 ServletOutputStream os = response.getOutputStream(); //利用IO流工具类实现流文件的拷贝,(输出显示在浏览器上在线打开方式) IOUtils.copy(fis, os); IOUtils.closeQuietly(fis); IOUtils.closeQuietly(os); }

点击会提供对话框选择另存为: response.setHeader( “Content-Disposition “, “attachment;filename= “+filename);

通过IE浏览器直接选择相关应用程序插件打开: response.setHeader( “Content-Disposition “, “inline;filename= “+fliename)

下载前询问(是打开文件还是保存到计算机) response.setHeader( “Content-Disposition “, “filename= “+filename);

至此文件的上传下载就完成了,其他用户名显示,注销,删除功能可在项目中查看(删除功能需要实现删除数据库指定文件信息并删除指定文件)

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 String srcName = allFile[currentFile].getPath().toString(); uploadFile(new File(srcName), remoteDirectoryPath); } } for (int currentFile = 0; currentFile // 递归 uploadDirectory(allFile[currentFile].getPath().toString(), remoteDirectoryPath); } } return true; } /*** * @下载文件夹 * @param * @param remoteDirectory 远程文件夹 * */ public boolean downLoadDirectory(String localDirectoryPath, String remoteDirectory) { try { String fileName = new File(remoteDirectory).getName(); localDirectoryPath = localDirectoryPath + fileName + "//"; new File(localDirectoryPath).mkdirs(); FTPFile[] allFile = this.ftpClient.listFiles(remoteDirectory); for (int currentFile = 0; currentFile downloadFile(allFile[currentFile].getName(), localDirectoryPath, remoteDirectory); } } for (int currentFile = 0; currentFile String strremoteDirectoryPath = remoteDirectory + "/" + allFile[currentFile].getName(); downLoadDirectory(localDirectoryPath, strremoteDirectoryPath); } } } catch (IOException e) { e.printStackTrace(); logger.info("下载文件夹失败"); return false; } return true; } // FtpClient的Set 和 Get 函数 public FTPClient getFtpClient() { return ftpClient; } public void setFtpClient(FTPClient ftpClient) { this.ftpClient = ftpClient; } public static void main(String[] args) throws IOException { Ftp ftp = new Ftp("10.3.15.1", 21, "ghips", "ghipsteam"); ftp.ftpLogin(); //上传文件夹 ftp.uploadDirectory("d://DataProtemp", "/home/data/"); //下载文件夹 ftp.downLoadDirectory("d://tmp//", "/home/data/DataProtemp"); ftp.ftpLogOut(); } }


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