Spring HTTP Client

Question

I am new to Spring and I need my Java app to connect to another API over HTTP (JSON, RESTful). Does the Spring Framework have anything like a JSON HTTP Rest Client? What do Spring developers usually use?

Answer 1

I achieved what I needed with the following:

import org.springframework.http.HttpEntity; import org.springframework.http.HttpHeaders; import org.springframework.http.HttpMethod; import org.springframework.http.HttpStatus; import org.springframework.http.ResponseEntity; import org.springframework.web.client.RestTemplate;  public class RestClient {    private String server = "http://localhost:3000";   private RestTemplate rest;   private HttpHeaders headers;   private HttpStatus status;    public RestClient() {     this.rest = new RestTemplate();     this.headers = new HttpHeaders();     headers.add("Content-Type", "application/json");     headers.add("Accept", "*/*");   }    public String get(String uri) {     HttpEntity<String> requestEntity = new HttpEntity<String>("", headers);     ResponseEntity<String> responseEntity = rest.exchange(server + uri, HttpMethod.GET, requestEntity, String.class);     this.setStatus(responseEntity.getStatusCode());     return responseEntity.getBody();   }    public String post(String uri, String json) {        HttpEntity<String> requestEntity = new HttpEntity<String>(json, headers);     ResponseEntity<String> responseEntity = rest.exchange(server + uri, HttpMethod.POST, requestEntity, String.class);     this.setStatus(responseEntity.getStatusCode());     return responseEntity.getBody();   }    public void put(String uri, String json) {     HttpEntity<String> requestEntity = new HttpEntity<String>(json, headers);     ResponseEntity<String> responseEntity = rest.exchange(server + uri, HttpMethod.PUT, requestEntity, null);     this.setStatus(responseEntity.getStatusCode());      }    public void delete(String uri) {     HttpEntity<String> requestEntity = new HttpEntity<String>("", headers);     ResponseEntity<String> responseEntity = rest.exchange(server + uri, HttpMethod.DELETE, requestEntity, null);     this.setStatus(responseEntity.getStatusCode());   }    public HttpStatus getStatus() {     return status;   }    public void setStatus(HttpStatus status) {     this.status = status;   }  }