提问人：Eldiyar Amanturov 提问时间：9/27/2023 最后编辑：Diego BorbaEldiyar Amanturov 更新时间：9/28/2023 访问量：452
Spring Boot MultipartFile 资源 [file] 无法解析为绝对文件路径
Spring Boot MultipartFile resource [file] cannot be resolved to absolute file path
问：
这可能是由于什么原因造成的？ 目录在 /opt/docs 中，该文件存在。文件已上传，但我无法将其下载回去
也许我错过了什么，我认为问题出在convertFileFromPath，帮我弄清楚
@PostMapping(value = "/upload", consumes = {MediaType.MULTIPART_FORM_DATA_VALUE, MediaType.APPLICATION_OCTET_STREAM_VALUE})
public AttachmentResponseDto uploadFile(@RequestPart AttachmentRequestDto dto, @RequestPart MultipartFile file) throws IOException {
return service.saveAttachment(file, dto.getType());
}
@GetMapping(value = "/download/{id}")
public AttachmentResponseDto downloadById(@PathVariable Long id) throws IOException {
return service.getFileById(id);
}
@Value("${file.storage.docs}")
private String docDirectory;
@Override
public AttachmentResponseDto saveAttachment(MultipartFile file, String type) throws IOException {
AttachmentResponseDto responseDto = new AttachmentResponseDto();
String extension = StringUtils.getFilenameExtension(file.getOriginalFilename());
String fileName = Objects.requireNonNull(type).concat("№" + UUID.randomUUID().toString()).concat("." + extension);
Path root = Paths.get(docDirectory);
Files.copy(file.getInputStream(), root.resolve(fileName));
responseDto.setFilePath(root.toString().concat("/").concat(fileName));
responseDto.setType(type);
responseDto.setExtension(extension);
responseDto.setName(fileName);
Attachments attachments = convertDtoToEntity(responseDto);
Attachments saved = repository.save(attachments);
responseDto.setAttachmentId(saved.getId());
return responseDto;
}
@Override
public AttachmentResponseDto getFileById(Long id) throws IOException {
Attachments getById = repository.findById(id).get();
AttachmentResponseDto responseDto = convertDtoToEntity(getById);
responseDto.setFile(convertFileFromPath(getById));
return responseDto;
}
@Override
public MultipartFile convertFileFromPath(Attachments attachments) throws IOException {
return new MockMultipartFile(attachments.getName(), new FileInputStream(attachments.getPath()));
}
答：
1赞
Euklios
9/27/2023
#1
MockMultipartFile 是一个测试依赖项，不应在非测试代码中使用。此外，MultipartFile 仅用于上传到 API，而不用于下载文件。对于下载，只需返回资源就足够了。
这应该更符合您的需求。
@GetMapping(value = "/download/{id}")
public Resource downloadById(@PathVariable Long id) throws IOException {
// ...
Resource resource = new InputStreamResource(new FileInputStream(file));
return resource;
}
0赞
Eldiyar Amanturov
9/28/2023
#2
@GetMapping(value = "/download/{id}")
public ResponseEntity<InputStreamResource> downloadById(@PathVariable Long id) throws IOException {
Attachments attachments = repository.findById(id).orElse(null);
if (attachments == null) {
return ResponseEntity.notFound().build();
}
String fileName = attachments.getName();
Path filePath = Paths.get(attachments.getPath());
InputStreamResource resource = new InputStreamResource(new FileInputStream(filePath.toFile()));
return ResponseEntity.ok()
.contentType(MediaType.APPLICATION_OCTET_STREAM)
.header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + fileName + "\"")
.body(resource);
}
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MockMultipartFile