java - Spring API return a file rather than String

Question

I have the code below as an api endpoint. I want the json string to be displayed on browser when I access the endpoint.

However, when I access the endpoint, a file is downloaded. The file named api.json contains {"key": "myKey"}. I have no idea why it generates a file. Can I get some help?

Thanks!

@GetMapping(path="/getFields2", produces=MediaType.APPLICATION_JSON_VALUE)
public ResponseEntity getFieldssec(@Context HttpServletRequest httpServletRequest)
{
    return ResponseEntity.ok("{"key": "myKey"}");
}

question from:https://stackoverflow.com/questions/65909411/spring-api-return-a-file-rather-than-string

Answer 1

You can create a Spring Resource and return it

@GetMapping(path="/getFields2", produces=MediaType.APPLICATION_JSON_VALUE)
public  ResponseEntity<Resource> getFieldssec(
        @Context HttpServletRequest httpServletRequest) {

    String text="{"key": "myKey"}";
    Resource resource = new ByteArrayResource(text.getBytes());

    return ResponseEntity.ok()
        .contentLength(text.length())
        .contentType(MediaType.APPLICATION_JSON)
        .body(resource);
}