[Spring] Using RestTemplate to do HTTP Post and Get

Problem
How to use Spring RestTemplate to implement HTTP Post and Get.
The requirement is:
1. Using HTTP Get to get JSON string
2. Using HTTP Post to post JSON string to server

How-To
The example is as bellows:

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@Autowired private RestTemplate restTemplate; // example for HTTP Get String getUrl = "http://192.168.0.1:8080/status"; try { String statusJSONString = restTemplate.getForObject(new URI(getUrl), String.class); } catch (RestClientException | URISyntaxException e) { throw new IllegalArgumentException(e.getMessage()); } // example for HTTP Post String postUrl = "http://192.168.0.1:8080/train?name=test1"; HttpHeaders headers = new HttpHeaders(); headers.setContentType(MediaType.APPLICATION_JSON); HttpEntity<String> entity = new HttpEntity<String>(jsonString, headers); try { restTemplate.postForEntity(new URI(url), entity, String.class); } catch (RestClientException | URISyntaxException e) { throw new IllegalArgumentException(e.getMessage()); }