springboot中的restTemplate工具類

/**
 * RestTemplate 工具類
 * @author: author
 * @create: 2019-06-05 14:06
 **/
public class RestTemplateUtil {
 
    private static class SingletonRestTemplate {
        static final RestTemplate INSTANCE = new RestTemplate();
    }
 
    private RestTemplateUtil() {
    }
 
 
    public static RestTemplate getInstance() {
        return SingletonRestTemplate.INSTANCE;
    }
 
    /**
     * post 請求
     * @param url 請求路徑
     * @param data body數據
     * @param token JWT所需的Token，不需要的可去掉
     * @return
     */
    public static String post(String url, String data, String token) {
        HttpHeaders headers = new HttpHeaders();
        headers.add("Accept", "application/json");
        headers.add("Content-Encoding", "UTF-8");
        headers.add("Content-Type", "application/json; charset=UTF-8");
        if (token != null) {
            headers.add("Authorization", token);
        }
        HttpEntity<String> requestEntity = new HttpEntity<>(data, headers);
        return RestTemplateUtil.getInstance().postForObject(url, requestEntity, String.class);
    }
 
    /**
     * get 請求
     * @param url 請求路徑
     * @param token JWT所需的Token，不需要的可去掉
     * @return
     */
    public static  String get(String url, String token) {
        HttpHeaders headers = new HttpHeaders();
        headers.add("Accept", "application/json");
        headers.add("Content-Encoding", "UTF-8");
        headers.add("Content-Type", "application/json; charset=UTF-8");
        if (token != null) {
            headers.add("Authorization", token);
        }
        HttpEntity<String> requestEntity = new HttpEntity<>(null, headers);
        ResponseEntity<String> response = RestTemplateUtil.getInstance().exchange(url, HttpMethod.GET, requestEntity, String.class);
        String responseBody = response.getBody();
        return responseBody;
    }
}