问题描述:

	@RequestMapping(value = "upload", method = RequestMethod.POST,consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
public void upload(@RequestPart MultipartFile upfile) throws Exception {
return fileStorageService.upload(upfile);
}

上面的代码是上传一个文件到upload方法中,然后在该方法中调用fileStorageService(FeignClient)去上传

fileStorageService.upload方法如下:

@FeignClient(name = "STORAGE")
@RequestMapping("/file")
public interface FileStorageService {
@PostMapping(value = "/upload",consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
String upload(@RequestPart MultipartFile file);
}

在实际运行过程中,报错:

org.springframework.web.multipart.support.MissingServletRequestPartException: Required request part 'file' is not present

问题原因

因为upfile的属性是upfile,而不是file,传递到fileStorageService.upload方法中的时候,找不到file标记的文件内容

解决方案

方案一:让两个方法的参数名一致

方案二:处理upfile对象,让它生成一个新的MutipartFile对象

MultipartFile multipartFile = new MultipartFileDto(PlatformStorage.MinioMutipartFileFieldName.FIELD_NAME,  bytes);
//自定义一个MultipartFile
public class MultipartFileDto implements MultipartFile {
private final String name; private String originalFilename; private String contentType; private final byte[] content; /**
* Create a new MultipartFileDto with the given content.
* @param name the name of the file
* @param content the content of the file
*/
public MultipartFileDto(String name, byte[] content) {
this(name, "", null, content);
} /**
* Create a new MultipartFileDto with the given content.
* @param name the name of the file
* @param contentStream the content of the file as stream
* @throws IOException if reading from the stream failed
*/
public MultipartFileDto(String name, InputStream contentStream) throws IOException {
this(name, "", null, FileCopyUtils.copyToByteArray(contentStream));
} /**
* Create a new MultipartFileDto with the given content.
* @param name the name of the file
* @param originalFilename the original filename (as on the client's machine)
* @param contentType the content type (if known)
* @param content the content of the file
*/
public MultipartFileDto(String name, String originalFilename, String contentType, byte[] content) {
this.name = name;
this.originalFilename = (originalFilename != null ? originalFilename : "");
this.contentType = contentType;
this.content = (content != null ? content : new byte[0]);
} /**
* Create a new MultipartFileDto with the given content.
* @param name the name of the file
* @param originalFilename the original filename (as on the client's machine)
* @param contentType the content type (if known)
* @param contentStream the content of the file as stream
* @throws IOException if reading from the stream failed
*/
public MultipartFileDto(String name, String originalFilename, String contentType, InputStream contentStream)
throws IOException { this(name, originalFilename, contentType, FileCopyUtils.copyToByteArray(contentStream));
} @Override
public String getName() {
return this.name;
} @Override
public String getOriginalFilename() {
return this.originalFilename;
} @Override
public String getContentType() {
return this.contentType;
} @Override
public boolean isEmpty() {
return (this.content.length == 0);
} @Override
public long getSize() {
return this.content.length;
} @Override
public byte[] getBytes() throws IOException {
return this.content;
} @Override
public InputStream getInputStream() throws IOException {
return new ByteArrayInputStream(this.content);
} @Override
public void transferTo(File dest) throws IOException, IllegalStateException {
FileCopyUtils.copy(this.content, dest);
} }

方案三:升级springboot和springcloud

我发现这个问题在2.1.7.RELEASE和Greenwich.SR2下会出现,但是升级到2.4.0和2020.0.4后就不会出现,直接这样使用没问题

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