我想在一個主根目錄下創建目錄。我試過這段代碼：private static String UPLOADED_FOLDER = "/opt/";@PostMappingpublic ResponseEntity<StringResponseDTO> uploadData(@RequestParam("file") MultipartFile file, RedirectAttributes redirectAttributes, @RequestParam("id") Integer merchant_id) throws Exception { InputStream inputStream = file.getInputStream(); String originalName = file.getOriginalFilename(); String name = file.getName(); String contentType = file.getContentType(); long size = file.getSize(); LOG.info("name: " + name); LOG.info("contentType: " + contentType); LOG.info("size: " + size); try { byte[] bytes = file.getBytes(); File newFile = new File(UPLOADED_FOLDER + merchant_id, file.getOriginalFilename()); LOG.info("New file location: " + newFile.getAbsolutePath()); //Log the path Files.write(newFile.toPath(), bytes); } catch (IOException e) { e.printStackTrace(); } return ResponseEntity.ok(new StringResponseDTO(originalName));}但我得到例外：2019-08-12 09:53:30,748 INFO [stdout] (default task-79) 09:53:30.747 [default task-79] INFO o.d.a.b.restapi.MerchantController - New file location: /opt/13/Screenshot 2019-08-01 at 14.58.59.png2019-08-12 09:53:30,749 ERROR [stderr] (default task-79) java.nio.file.NoSuchFileException: /opt/13/Screenshot 2019-08-01 at 14.58.59.png2019-08-12 09:53:30,750 ERROR [stderr] (default task-79) at java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:92)我需要將數字轉換merchant_id成字符串嗎？
1 回答
jeck貓
TA貢獻1909條經驗 獲得超7個贊
我認為拋出異常是因為目錄/opt/13不存在。Files.write將創建文件，但沒有父目錄。這是Files.write文檔的一部分：
options 參數指定文件的創建或打開方式。如果不存在任何選項，則此方法的工作方式就像存在 CREATE、TRUNCATE_EXISTING 和 WRITE 選項一樣。換句話說，它打開文件進行寫入，如果文件不存在則創建文件，或者最初將現有的常規文件截斷為 0 大小。
替換以下行
File newFile = new File(UPLOADED_FOLDER + merchant_id, file.getOriginalFilename());
LOG.info("New file location: " + newFile.getAbsolutePath()); //Log the path
Files.write(newFile.toPath(), bytes);
和
File directory = new File(UPLOADED_FOLDER, merchant_id.toString());
directory.mkdirs();
File newFile = new File(directory, file.getOriginalFilename());
LOG.info("New file location: " + newFile.getAbsolutePath()); //Log the path
Files.write(newFile.toPath(), bytes);
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