学习传送门：RestTemplate精讲

public class HttpUtils {

    @Autowired
    private RestTemplate restTemplate;

    public <T> ResponseEntity<T> post(String uri, HttpHeaders httpHeaders, Object content, Class<T> resClass){

        httpHeaders.setContentType(MediaType.APPLICATION_JSON);
        RequestEntity requestEntity = null;
        try{
            requestEntity = new RequestEntity<>(
                    content,
                    httpHeaders,
                    HttpMethod.POST,
                    new URI(uri));
        }catch (URISyntaxException e){
            e.printStackTrace();
        }

        return  restTemplate.exchange(requestEntity, resClass);
    }

    public <T> ResponseEntity<T> get(String uri, HttpHeaders httpHeaders, Class<T> resClass){
        HttpEntity entity  = new HttpEntity(httpHeaders);
        return  restTemplate.exchange(uri, HttpMethod.GET, entity, resClass);
    }

}

异常的处理补充：

• ResponseErrorHandler
• DefaultResponseErrorHandler
• ExtractingResponseErrorHandler
• NoOpResponseErrorHandler
• 自定义异常处理器

我们自定义异常器除了实现ResponseErrorHandler接口，还能继承DefaultResponseErrorHandler类，如果只需要自定义状态码错误检测，重写其实现的hasError方法；

boolean hasError(ClientHttpResponse response)

如果只需要自定义异常处理，重写其handleError方法即可，

void handleError(ClientHttpResponse response)

如果全部要自定义，那还是实现其ResponseErrorHandler接口好点吧！