springboot中RestTemplate发送HTTP请求的实现示例

    /**
     * 发送没有请求体的请求
     * @param url 请求url
     * @param reqParam 地址栏参数
     * @return 想要结果
     */
    public static JSONObject httpPostResult(String url, Map<String, Object> reqParam) {
        String params = getParameter(reqParam);
        if (StringUtils.isBlank(params)) {
            log.error("获取sign失败,sign=null");
            return null;
        }
        HttpEntity<Map<String, String>> httpEntity = new HttpEntity<>(setHeaders());
        //解析请求结果
        String result = new RestTemplate().postForObject(url + params, httpEntity, String.class);
        return JSONObject.parseObject(result);
    }
 
    /**
     * 对地址栏的参数进行拼接
     * @param map 地址栏参数
     * @return 拼接后的结果
     */
    public static String getParameter(Map<String, Object> map) {
        try {
            if (MapUtil.isEmpty(map)) {
                return null;
            }
            String result = "";
            for (String key : map.keySet()) {
                if (Objects.nonNull(map.get(key) )) {
                    if (!"".equals(result)) {
                        result += "&";
                    }
                    result = result + key + "=" + map.get(key);
                }
            }
            return result;
        } catch (Exception e) {
            log.error("map转参出错", e);
        }
        return null;
    }

    /**
     * 设置请求头
     * @return 请求头
     */
   private static HttpHeaders setHeaders() {
        HttpHeaders httpHeaders = new HttpHeaders();
        httpHeaders.add("Accept", MediaType.APPLICATION_JSON.toString());
        httpHeaders.add("Accept-Charset", "UTF-8");
        return httpHeaders;
    }

curl --location --request POST 'http://xxx:8080/tree/getTree?param1=abc&param2=123&param3=def' \

    /**
     * 发送带有地址栏参数，有请求体的请求
     * @param url 请求 url
     * @param reqParam url上的参数
     * @param reqBody 请求体
     * @return 响应结果
     */
    public static JSONObject httpPostResult(String url, Map<String, Object> reqParam, Map<String, Object> reqBody) {
        String params = getParameter(reqParam);
        if (StringUtils.isBlank(params)) {
            log.error("获取sign失败,sign=null");
            return null;
        }
        //封装请求头和内容
        HttpEntity<Map<String, Object>> requestEntity = new HttpEntity<>(reqBody, setHeaders());
        //解析请求结果
        String result = new RestTemplate().postForObject(url + params, requestEntity, String.class);
        return JSONObject.parseObject(result);
    }

curl --location --request POST 'http://xxx:8080/tree/getTree?param1=abc&param2=123&param3=def' --header 'Content-Type: application/json' \
--data-raw '{"parentId":80}'

    /**
     * 发送form-data请求
     * @param url 请求 url
     * @param data 请求体
     * @return 响应结果
     */
    public JSONObject httpPostResult(String url, MultiValueMap<String, String> data) {
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
        //解析请求结果
        HttpEntity<MultiValueMap<String, String>> requestEntity = new HttpEntity<>(data, headers);
        ResponseEntity<String> response = restTemplate.postForEntity(url, requestEntity, String.class);
        return JSONObject.parseObject(response.getBody());
    }

 @PostMapping("/postRequest")
    public JSONObject intervalData(ChargeLogIntervalDataReq request) {
        String url = "http://xxx:8081/api/list";
        MultiValueMap<String, String> data = new LinkedMultiValueMap<>();
        data.put("page", Lists.newArrayList(request.getPage()));
        data.put("limit", Lists.newArrayList(request.getLimit()));
        return httpUtils.httpPostResult(url, data);
    }