[Spring MVC] Upload ZIP file to server

Scenario

The file structure in ZIP file looks like:

How-To
Here has sample code:

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@Transactional @PostMapping(value = "/{projectId}/importFile/{fileType}", produces = MediaType.APPLICATION_JSON_VALUE) public void importFile(@PathVariable Integer projectId, @PathVariable String fileType, @RequestParam(value = "file", required = true) MultipartFile file) throws IOException { Project project = repo.findOne(projectId); File tmpFile = null; DateFormat dateFormat = new SimpleDateFormat("yyyyMMddHHmmss"); String currentTime = dateFormat.format(new Date()); try { tmpFile = File.createTempFile(file.getName() + "_" + currentTime, ".zip"); tmpFile.deleteOnExit(); } catch (IOException e) { throw new RuntimeException("建立 temp file 發生錯誤, 錯誤原因: " + e.getMessage(), e); } InputStream inputStream = null; ZipFile zipFile = null; try { inputStream = file.getInputStream(); byte[] buffer = new byte[inputStream.available()]; inputStream.read(buffer); Files.write(buffer, tmpFile); zipFile = new ZipFile(tmpFile); Enumeration<? extends ZipEntry> entries = zipFile.entries(); while (entries.hasMoreElements()) { ZipEntry entry = entries.nextElement(); saveDomainJSON(project, entry, zipFile); saveStoryMD(project, entry, zipFile); } repo.updatePersistModelToNull(projectId); } catch (IOException e) { throw new RuntimeException("讀取 zip file 發生錯誤, 錯誤原因: " + e.getMessage(), e); } finally { if (zipFile != null) { zipFile.close(); } if (inputStream != null) { inputStream.close(); } } } private void saveDomainJSON(Project project, ZipEntry entry, ZipFile zipFile) throws IOException { if (entry.getName().startsWith("domain")) { try (InputStream inputSteam = zipFile.getInputStream(entry);) { String content = IOUtils.toString(inputSteam, org.apache.commons.io.Charsets.UTF_8); // save content into database } catch (IOException e) { throw new RuntimeException("讀取 domain JSON file 發生錯誤, 錯誤原因: " + e.getMessage(), e); } } } private void saveStoryMD(Project project, ZipEntry entry, ZipFile zipFile) throws IOException { if (entry.getName().startsWith("story")) { try (InputStream inputSteam = zipFile.getInputStream(entry);) { String content = IOUtils.toString(inputSteam); // save content into database } catch (IOException e) { throw new RuntimeException("讀取 story Markdown file 發生錯誤, 錯誤原因: " + e.getMessage(), e); } } }