Spring Boot 2.2.5 get post request parameters

Question

Is there a way to get request body(JSON) parameters without using a POJO object for each request? I have two types of requests, in many of these request what I want is get a parameter from request, for example something like this:

{"name": "Mike", "Age":25}

request.getBodyParameter("name");

and for some of my requests I want to convert the input json to a JAVA hash map.

Answer 1

@RequestMapping(value = "/foo", method = RequestMethod.POST, consumes = "application/json")
public Status getJsonData(@RequestBody JsonObject jsonData){
}

from jsonData yo can do jsonData.getString("name") or you can convert this into map

HashMap<String,Object> result =
        new ObjectMapper().readValue(jsonData, HashMap.class);

Update

 public Status getJsonData(@RequestBody JsonNode jsonNode){
   String name = jsonNode.get("name").asText();
}

For conversion to map

ObjectMapper mapper = new ObjectMapper();
Map<String, Object> result = mapper.convertValue(jsonNode, new TypeReference<Map<String, Object>>(){});

Answer 2

Use JsonNode to take dynamic object;

Here is example

   @PostMapping("/mapping")
    public String getDynamicData(@RequestBody JsonNode jsonNode) {
        String name = jsonNode.get("name").asText();
        return name;
    }

Answer 3

If you want to convert JSON into hashmap in controller than below solution will work. ObjectConvetore reduce your performance. It's an extra conversion ObjectConvetore reduce your performance. It's an extra conversion .

@ResponseStatus(HttpStatus.ACCEPTED)
@RequestMapping(value = "/hi", method = RequestMethod.POST, consumes = "application/json")
public void startMartExecution(@RequestBody(required = true) Map<String,String> martCriterias) {
        System.out.println(martCriterias.get("name"));
}

If you call restAPI from your application thn below code will work.

HttpHeaders headers = new HttpHeaders();
RestTemplate restTemplate = new RestTemplate();
headers.setContentType(MediaType.APPLICATION_JSON);
headers.setAccept(Collections.singletonList(MediaType.ALL));
HttpEntity<Void> entity = new HttpEntity<Void>(null, headers);
Map<String, Object> body = new HashMap<>();
ParameterizedTypeReference<Map<String, Object>> parameterizedTypeReference = new ParameterizedTypeReference<Map<String, Object>>() {};
ResponseEntity<Map<String, Object>> result = restTemplate.exchange(URL, HttpMethod.GET, entity, parameterizedTypeReference);
body = result.getBody();

Thank You