Spring Boot API接受JSON（强制性）和多部分文件（可选）

Question

I want to create an API which accepts both object (as JSON) and allows to upload multiple files.

• Uploading file is optional. ie a request may or may not have one or more files in request.

I am using spring boot at tried code below

@RequestMapping(value = "/some-action", method = RequestMethod.POST)
public void post(@RequestPart(value = "jsonString") String jsonAsString, 
                 @RequestPart(value = "file", required = false) MultipartFile[] files, 
                 HttpServletResponse response)

I am accepting jsonAsString because I was not able to accept object instead. So, for temporary solution I am passing json string.

Now, as you can see in code above that for file I have set required to false . But, I am getting server error when I am not passing any file.

Below is my request body.

--ARCFormBoundaryer1k80a5e1att9
Content-Disposition: form-data; name="text"

"{"key":"value"}"
--ARCFormBoundaryer1k80a5e1att9--

Below is error I am getting. org.apache.tomcat.util.http.fileupload.MultipartStream$MalformedStreamException: Stream ended unexpectedly at org.apache.tomcat.util.http.fileupload.MultipartStream.readHeaders(MultipartStream.java:487) ~[tomcat-embed-core-8.0.23.jar:8.0.23] at org.apache.tomcat.util.http.fileupload.FileUploadBase$FileItemIteratorImpl.findNextItem(FileUploadBase.java:889) ~[tomcat-embed-core-8.0.23.jar:8.0.23] at org.apache.tomcat.util.http.fileupload.FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:854) ~[tomcat-embed-core-8.0.23.jar:8.0.23] at org.apache.tomcat.util.http.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:256) ~[tomcat-embed-core-8.0.23.jar:8.0.23] at org.apache.tomcat.util.http.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:280) ~[tomcat-embed-core-8.0.23.jar:8.0.23] at org.apache.catalina.connector.Request.parseParts(Request.java:2730) ~[tomcat-embed-core-8.0.23.jar:8.0.23]

Please suggest me what can I do to fulfill my requirement.

Answer 1

I think I understand what you are trying to do. We tried something similar. Unfortunately because of the different way file uploads get handled than normal data payloads on a POST, you will probably have to use a different URL.

We got it working in one browser (can't remember which), but it was flakey. It's kind of like overloading a URL.

Sorry, but I hope this does disappoint you too much...