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 Spri

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 requestEntity = new HttpEntity("", headers);
    ResponseEntity 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 requestEntity = new HttpEntity(json, headers);
    ResponseEntity 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 requestEntity = new HttpEntity(json, headers);
    ResponseEntity responseEntity = rest.exchange(server + uri, HttpMethod.PUT, requestEntity, null);
    this.setStatus(responseEntity.getStatusCode());   
  }

  public void delete(String uri) {
    HttpEntity requestEntity = new HttpEntity("", headers);
    ResponseEntity 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;
  } 
}