Springboot前后端分离上传、下载压缩包、查看文件

Controller层：

 /*** 保存附件按钮* @param file 附件* @return 附件路径**/@PostMapping(value = "/upload")Object saveFile(@RequestParam("file") MultipartFile[] file) {return eventService.saveFile(file);}/*** 下载附件按钮* @param fileDTO 事件id和文件路径* eventId 事件id* downloadPath 下载的压缩包名* @return 附件**/@PostMapping(value = "/download")Object getFiles(@RequestBody FileDTO fileDTO,HttpServletResponse response) {return eventService.getFiles(fileDTO, response);}/*** 查看附件* @param eventId 事件id* @return 列表**/@PostMapping(value = "/showFile")Object getFile(@RequestBody EventIdDto eventId) {return eventService.showFile(eventId.getEventId());}

Service层:

 @Value("${system.file}")private String filePath; // 在yml文件中配置路径/*** 保存附件按钮* @return 附件路径* @param file 附件**/@Overridepublic String saveFile(MultipartFile[] files) {StringBuilder filesPath = new StringBuilder();if (files == null) {throw new CustomException("附件不能为空");}try {for (MultipartFile file : files) {//上传文件int idx = file.getOriginalFilename().indexOf('.');String ext = file.getOriginalFilename().substring(idx + 1);String fileName = UUID.randomUUID().toString().replace("-", "") + "." + ext;FileIoUtil.fileUpload(file, filePath, fileName);filesPath.append(filePath + fileName).append(",");}filesPath.delete(filesPath.lastIndexOf(","), filesPath.lastIndexOf(",") + 1);} catch (IOException e) {e.printStackTrace();}return filesPath.toString();}/*** 下载附件按钮** @return 附件路径* @param userId 用户Id* @param eventId 事件Id* @param downloadPath 文件下载路径**/@Overridepublic Object getFiles(FileDTO fileDTO, HttpServletResponse response) {String eventId = fileDTO.getEventId();String downloadPath = fileDTO.getDownloadPath();if (StringUtils.isBlank(eventId)) {throw new CustomException("事件id不能为空");}int index = downloadPath.lastIndexOf("/");String fileName = downloadPath.substring(index + 1, downloadPath.length());File zip = new File(filePath + fileName);// 获取事件信息Event event = eventMapper.selectByPrimaryKey(eventId);if (event == null) {throw new CustomException("未找到对应的事件信息");}if (StringUtils.isBlank(event.getFileLocation())) {throw new CustomException("文件不存在");}// 获取文件路径String[] filesPath = event.getFileLocation().split(",");File[] files = new File[filesPath.length];// 压缩文件for (int i = 0; i < filesPath.length; i++) {File file = new File(filesPath[i]);files[i] = file;}ZipUtil.zip(FileUtil.file(filePath + fileName), false, files);// 传输文件ServletOutputStream out = null;FileInputStream is = null;try {response.setCharacterEncoding("UTF-8");response.setContentType("text/html");response.setHeader("Content-Disposition", "attachment;fileName=" + downloadPath);is = new FileInputStream(zip);out = response.getOutputStream();int b = 0;byte[] buffer = new byte[1024];while ((b = is.read(buffer)) != -1) {out.write(buffer, 0, b);}} catch (IOException e) {e.printStackTrace();} finally {try {if (is != null) {is.close();}if (out != null) {out.close();}} catch (IOException e) {e.printStackTrace();}}return null;}/*** 查看报告* @return 结果* @param eventId 用户id**/@Overridepublic Object showFile(String eventId) {if (StringUtils.isBlank(eventId)) {throw new CustomException("事件id不能为空");}Event event = eventMapper.selectByPrimaryKey(eventId);if (event == null) {throw new CustomException("未找到对应的事件信息");}// 获取文件路径String[] filesPath = event.getFileLocation().split(",");List<String> list = new ArrayList<>();BufferedReader reader = null;try {for (String path : filesPath) {File file = new File(path);reader = new BufferedReader(new FileReader(file));StringBuffer sbf = new StringBuffer();String tempStr;while ((tempStr = reader.readLine()) != null) {sbf.append(tempStr);}list.add(sbf.toString());}} catch (Exception e) {e.printStackTrace();}return list;}

FileIoUtil:

public class FileIoUtil {private FileIoUtil() {throw new IllegalStateException("Utility class");}/*** 文件上传** @param file     文件* @param path     文件存放路径* @param fileName 文件名* @throws IOException "file empty"*/public static void fileUpload(MultipartFile file, String path, String fileName) throws IOException {if (file.isEmpty()) {throw new IOException("file empty");}String filePath = path + fileName;try (InputStream in = file.getInputStream();FileOutputStream out = new FileOutputStream(filePath)) {int count;while ((count = in.read()) != -1) {out.write(count);}}}/*** 文件上传** @param file 文件* @param path 文件存放路径* @throws IOException "file empty"*/public static void fileUpload(MultipartFile file, String path) throws IOException {if (file.isEmpty()) {throw new IOException("file empty");}String fileName = file.getOriginalFilename();fileUpload(file, path, fileName);}/*** 文件下载** @param fileName 文件名* @param filePath 文件存放路径* @param response HttpServletResponse* @throws IOException "file not exists"*/public static void fileDownload(String fileName, String filePath, HttpServletResponse response) throws IOException {String path = filePath + fileName;File file = new File(path);if (!file.exists()) {throw new IOException("file not exists");}try (OutputStream out = response.getOutputStream();FileInputStream in = new FileInputStream(path)) {response.reset();response.setContentType("application/octet-stream; charset=utf-8");response.setCharacterEncoding("utf-8");response.setHeader("content-disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));int count;byte[] buffer = new byte[1024];while ((count = in.read(buffer)) > 0) {out.write(buffer, 0, count);}}}
}

ZipUtils使用了Hutool工具包，请自行下载依赖。

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