使用了 RestTemplate、Jackson 来封装了一个简单的http请求工具类，方便后续使用

<!--jackson依赖 2.11.1 版本-->
<dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-core</artifactId>
</dependency>
<dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId>
</dependency>
<dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-annotations</artifactId>
</dependency>

/*** http工具类*/
public class HttpUtil {/** Rest template */private final RestTemplate restTemplate;/*** Http util** @since 1.0.0*/public HttpUtil() {this.restTemplate = createRestTemplate();}/*** Http util** @param restTemplate rest template* @since 1.0.0*/public HttpUtil(RestTemplate restTemplate) {this.restTemplate = restTemplate;}/*** Create rest template** @return the rest template* @since 1.0.0*/private RestTemplate createRestTemplate() {RestTemplate restTemplate = new RestTemplate();List<HttpMessageConverter<?>> converters = new ArrayList<>(2);MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();converter.setSupportedMediaTypes(Arrays.asList(MediaType.APPLICATION_JSON, MediaType.APPLICATION_OCTET_STREAM));converters.add(converter);List<HttpMessageConverter<?>> messageConverters = restTemplate.getMessageConverters();converters.addAll(messageConverters);restTemplate.setMessageConverters(converters);return restTemplate;}/*** Get** @param <T>           parameter* @param url           url* @param headers       headers* @param requestObject request object* @param responseType  response type* @return the t* @since 1.0.0*/public <T> T get(String url, Map<String, String> headers, Object requestObject, Class<T> responseType) {return sendRequest(url, HttpMethod.GET, headers, requestObject, responseType);}/*** Get** @param <T>           parameter* @param url           url* @param requestObject request object* @param responseType  response type* @return the t* @since 1.0.0*/public <T> T get(String url, Object requestObject, Class<T> responseType) {return sendRequest(url, HttpMethod.GET, null, requestObject, responseType);}/*** Get** @param <T>          parameter* @param url          url* @param responseType response type* @return the t* @since 1.0.0*/public <T> T get(String url, Class<T> responseType) {return sendRequest(url, HttpMethod.GET, null, null, responseType);}/*** Post** @param <T>           parameter* @param url           url* @param headers       headers* @param requestObject request object* @param responseType  response type* @return t t* @since 1.0.0*/public <T> T post(String url, Map<String, String> headers, Object requestObject, Class<T> responseType) {return sendRequest(url, HttpMethod.POST, headers, requestObject, responseType);}/*** Post** @param <T>           parameter* @param url           url* @param requestObject request object* @param responseType  response type* @return the t* @since 1.0.0*/public <T> T post(String url, Object requestObject, Class<T> responseType) {return sendRequest(url, HttpMethod.POST, null, requestObject, responseType);}/*** Post** @param <T>          parameter* @param url          url* @param responseType response type* @return the t* @since 1.0.0*/public <T> T post(String url, Class<T> responseType) {return sendRequest(url, HttpMethod.POST, null, null, responseType);}/*** Send request** @param <T>           parameter* @param url           url* @param method        method* @param headers       headers* @param requestObject request object* @param responseType  response type* @return the t* @since 1.0.0*/public <T> T sendRequest(String url, HttpMethod method,Map<String, String> headers,Object requestObject,Class<T> responseType) {HttpHeaders httpHeaders = new HttpHeaders();httpHeaders.setContentType(MediaType.APPLICATION_JSON);if (headers != null) {headers.forEach(httpHeaders::add);}HttpEntity<Object> httpEntity = new HttpEntity<>(requestObject, httpHeaders);ResponseEntity<T> responseEntity = this.restTemplate.exchange(url, method, httpEntity, responseType);return responseEntity.getBody();}}