user592748 user592748 - 2 months ago 24
reST (reStructuredText) Question

Producing and consuming custom JSON Objects in Spring RESTful services

I have some JSON Objects that are more complex than the JSON representations of the java objects I have. I have methods that build these JSON Objects and I would like to return and consume these directly. I use

org.json
library to build my JSONs. I could get the
GET
method working by returning the JSON Object as a
String
. Is this the correct way to go about it?

@RequestMapping(value = "/getjson", method = RequestMethod.GET, produces="application/json")
@ResponseBody
public String getJson() {
JSONObject json = new JSONObject();
JSONObject subJson = new JSONObject();
subJson .put("key", "value");
json.put("key", subJson);
return json.toString();
}


Now I want to know how do I consume a JSON Object? As a string and convert it to a JSON Object?

@RequestMapping(value = "/post", method = RequestMethod.POST, produces="application/json", consumes="application/json")
@ResponseBody
public String post(@RequestBody String json) {
JSONObject obj = new JSONObject(json);
//do some things with json, put some header information in json
return obj.toString();
}


Is this the correct way to go about my problem? I am a novice, so kindly point out anything that can be done better. Please note: I do not want to return POJOs.

Answer

I think using jackson library you can do something like below.

@RequestMapping(value = "/getjson", method = RequestMethod.GET, produces="application/json")
@ResponseBody
public String getJson() {
   //your logic
    ObjectMapper mapper = new ObjectMapper();
    return mapper.writeValueAsString(json);
}

@RequestMapping(value = "/post", method = RequestMethod.POST, produces="application/json", consumes="application/json")
@ResponseBody
public String post(@RequestBody String json) {
    POJO pj = new POJO();
    ObjectMapper mapper = new ObjectMapper();
    pj = mapper.readValue(json, POJO.class);

    //do some things with json, put some header information in json
    return mapper.writeValueAsString(pj);
}
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