How to extract HTTP status code from the RestTemplate call to a URL?

Question

I am using RestTemplate to make an HTTP call to our service which returns a simple JSON response. I don't need to parse that JSON at all. I just need to return whatever I am getting back from that service.

So I am mapping that to String.class and returning the actual JSON response as a string.

RestTemplate restTemplate = new RestTemplate();  String response = restTemplate.getForObject(url, String.class);  return response; 

Now the question is -

I am trying to extract HTTP Status codes after hitting the URL. How can I extract HTTP Status code from the above code? Do I need to make any change into that in the way I doing it currently?

Update:-

This is what I have tried and I am able to get the response back and status code as well. But do I always need to set HttpHeaders and Entity object like below I am doing it?

    RestTemplate restTemplate = new RestTemplate();           //and do I need this JSON media type for my use case?     HttpHeaders headers = new HttpHeaders();     headers.setContentType(MediaType.APPLICATION_JSON);      //set my entity     HttpEntity<Object> entity = new HttpEntity<Object>(headers);      ResponseEntity<String> out = restTemplate.exchange(url, HttpMethod.GET, entity, String.class);      System.out.println(out.getBody());     System.out.println(out.getStatusCode()); 

Couple of question - Do I need to have MediaType.APPLICATION_JSON as I am just making a call to url which returns a response back, it can return either JSON or XML or simple string.

Answer 1

Use the RestTemplate#exchange(..) methods that return a ResponseEntity. This gives you access to the status line and headers (and the body obviously).

• getStatusCode()
• getHeaders()

Answer 2

If you don´t want to leave the nice abstraction around RestTemplate.get/postForObject... methods behind like me and dislike to fiddle around with the boilerplate stuff needed when using RestTemplate.exchange... (Request- and ResponseEntity, HttpHeaders, etc), there´s another option to gain access to the HttpStatus codes.

Just surround the usual RestTemplate.get/postForObject... with a try/catch for org.springframework.web.client.HttpClientErrorException and org.springframework.web.client.HttpServerErrorException, like in this example:

try {     return restTemplate.postForObject("http://your.url.here", "YourRequestObjectForPostBodyHere", YourResponse.class);  } catch (HttpClientErrorException | HttpServerErrorException httpClientOrServerExc) {      if(HttpStatus.NOT_FOUND.equals(httpClientOrServerExc.getStatusCode())) {       // your handling of "NOT FOUND" here         // e.g. throw new RuntimeException("Your Error Message here", httpClientOrServerExc);     }     else {       // your handling of other errors here } 

The org.springframework.web.client.HttpServerErrorException is added here for the errors with a 50x.

Now you´re able to simple react to all the StatusCodes you want - except the appropriate one, that matches your HTTP method - like GET and 200, which won´t be handled as exception, as it is the matching one. But this should be straight forward, if you´re implementing/consuming RESTful services :)