RestTemplate发送get,post请求

平时工作中有对接外部接口的需求,这边将自己用的做一个总结,大概用了四种
1.发送get请求返回对象

/**
 *  Result返回的是接口返回的格式公共响应对象
 */

private <T> Result<T> getForObject(String url, Class<T> clazz) {
        try {
            ResponseEntity<String> response = getStringResponseEntity(url);
            if (response.getStatusCode().is2xxSuccessful()) {
                return parseObjectResult(response.getBody(), clazz);
            }
        } catch (Exception e) {
            log.error("调用出错，异常：{}", ExceptionUtils.getStackTrace(e));
        }
        // 失败的请求
        Result<T> result = new Result<>();
        result.setErrorCode("9998");
        result.setErrorMsg("访问接口失败，请稍后重试！");
        result.setSuccess(false);
        return result;
    }

2.发送get请求返回List对象

private <T> Result<List<T>> getForList(String url, Class<T> clazz) {
        try {
            ResponseEntity<String> response = getStringResponseEntity(url);
            if (response.getStatusCode().is2xxSuccessful()) {
                return parseListResult(response.getBody(), clazz);
            }
        } catch (Exception e) {
            log.error("[xx]调用出错，异常：{}", ExceptionUtils.getStackTrace(e));
        }
        // 失败的请求
        Result<List<T>> result = new Result<>();
        result.setErrorCode("9998");
        result.setErrorMsg("访问失败，请稍后重试！");
        result.setSuccess(false);
        return result ;
    }

发送get请求公用的方法

private ResponseEntity<String> getStringResponseEntity(String url) {
        log.debug("[xx]请求：url:{}, requestString:{}", url);
        String accessToken = xxxService.getToken();
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON_UTF8);
        headers.add(HttpHeaders.ACCEPT, MediaType.ALL_VALUE);
        //在请求头里添加token
        headers.add("Token", accessToken);
        restTemplate.getMessageConverters().set(1, new StringHttpMessageConverter(StandardCharsets.UTF_8));
        ResponseEntity<String> response = restTemplate
                .exchange(url, HttpMethod.GET, new HttpEntity<String>(headers), String.class);
        log.debug("[xx]结果：{}", response.getBody());
        return response;
    }

private <T> Result<List<T>> parseListResult(String body, Class<T> clazz) {
        return JSONObject.parseObject(body, new TypeReference<Result<List<T>>>(clazz) {
        });
    }

    private <T> Result<T> parseObjectResult(String body, Class<T> clazz) {
        return JSONObject.parseObject(body, new TypeReference<Result<T>>(clazz) {
        });
    }

3.发送post请求返回对象
4.发送post请求返回List对象