Write json String directly in SpringMVC

Question

In my spring-mvc application, the client requests with a key and I lookup the associated value in Couchbase. From Couchbase I get a json object as a String, as my application doesn't need to do anything with it I just want this to be written out.

But Spring sees that I want to write a String, and passes it to jackson which then writes it as a json string - adding in quotation marks and escaping the internals.

Simplest example:

@RequestMapping(value = "/thing", method = RequestMethod.GET, produces = "application/json")
@ResponseBody
public DeferredResult<String> getThing() {
    final DeferredResult<String> result = new DeferredResult<>();
    // in future
    result.setResult("{}");
    return result;
}

Returns: "{}"

I'm thinking of making a serialised json wrapper and a custom serialiser for jackson to just output it's contents.

score 1 · Accepted Answer · 2014-08-08 05:43:32Z

1

I think you could use org.springframework.http.ResponseEntity

@RequestMapping(value = "/example", headers = "Accept=application/json")
@ResponseBody
@Transactional
public ResponseEntity<String> example(@RequestParam(value = "documentId", required = true) Integer documentId) {

    HttpHeaders headers = new HttpHeaders();
    headers.add("Content-Type", "application/json; charset=utf-8");

    SomeDTO result = SomeDTO.findDocument(documentId);
    if (result == null) {
        return new ResponseEntity<String>(headers, HttpStatus.NOT_FOUND);
    }

    return new ResponseEntity<String>(result.toJson(), headers,HttpStatus.OK);
}

beside, you could use Flexjson to tranfer Oject to Json String.

edited Aug 8, 2014 at 5:43

answered Aug 8, 2014 at 4:54

user3883220

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Comments

MikeB · Accepted Answer · 2014-08-07 13:29:18Z

0

I added the StringHttpMessageConverter with application/json as a supportedMediaType:

    <mvc:message-converters>
        <bean class="org.springframework.http.converter.StringHttpMessageConverter">
            <property name="supportedMediaTypes" value = "application/json" />
        </bean>
    </mvc:message-converters>

This did get the String responses output as-is.

answered Aug 7, 2014 at 13:29

MikeB

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