In Spring Boot - Can you make request mapping that receives the whole message body without any parsing/intervention? - spring-boot

Question

I need to have a method that does not regard/parse the content of request message, just ... pass it along as input parameter to the #PostMapping method.
Is it possible? Because defining parameters like:
#RequestBody byte[] data
or
#RequestBody String text
tell the framework that it suppose to get some xml/json. and I want it to receive plain text + utf-8 encoding.
Some code to clarify:
#RestController
#RequestMapping(path="/abc", method = RequestMethod.POST)
public class NlpController {
#PostMapping(path="/def", consumes="text/plain; charset: UTF-8", produces=MediaType.APPLICATION_JSON_VALUE)
public ResponseEntity<Object> processText(#RequestBody String text)
{
...
return ResponseEntity.ok().body(object);
}
}
Trying also:
#RestController
#RequestMapping(path="/abc", method = RequestMethod.POST)
public class NlpController {
#PostMapping(path="/nlp", consumes=MediaType.APPLICATION_JSON_UTF8_VALUE, produces=MediaType.APPLICATION_JSON_VALUE)
public ResponseEntity<Object> process(HttpServletRequest request)
{
....
return ResponseEntity.ok().body(article);
}
}
But I get 406 response...
using curl:
curl -v -s -X POST -H "Content-Type:" -H "Content-Type: application/json; charset: utf-8" --data-binary #article.txt localhost:8080/abc/def/

Answer 1

I think you should inject HttpServletRequest as controller method attribute, then you will have acces to request payload.
#PostMapping(path="/something")
public ResponseEntity<Object> processText(HttpServletRequest request) {
// do something with request
}
More info.

Answer 2

406 Not Acceptable
The resource identified by the request is only capable of generating response entities which have content characteristics not acceptable according to the accept headers sent in the request.
https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/406
If i understand your question correctly you need to load text file directly as input param in spring boot rest call.
You need to modify your code and curl request , please use fllowing code as referance .
#RequestMapping(value = "/abc", method = RequestMethod.POST)
public String ResponseEntity<Object> processText(#RequestParam("file")
MultipartFile file) {
System.out.println("---------loading file----------");
/// Calculation and your logic
return ResponseEntity.ok().body(article);
}
Curl request :
curl -X POST localhost:8080/abc -F "file=#article.txt"
One more issue i can see in your curl request your mapping is abc and you are calling
localhost:8080/abc/def/
Using #RequestParam for multipartfile is a right way?
If using data in memory following code will work for you
#PostMapping(value = "/abc", consumes = "application/json", produces =
"application/json")
ResponseEntity<Object> processText( #RequestBody String input)
throws JSONException {
//
return ResponseEntity.ok().body(article);
}

Answer 3

Short answer: This is not a job for a full blown framework like spring boot. Better use something like spark that can do this with one liner and without any configurations. At least this is the best answer for my humble causes.
Long answer: I could not make spring boot to receive clean body text from a client, not even after many (failed) attempts to tweak the headers / media / consume flag / ... Guess this just (might) not be possible.