spring boot 使用 RestTemplate 进行web请求
默认的 new RestTemplate() 不支持 PATCH

RestTemplate client = new RestTemplate();

执行会报错如下
报错 java.net.ProtocolException: Invalid HTTP method: PATCH

可通过 使用指定 请求工厂 HttpComponentsClientHttpRequestFactory的方式来处理，代码如下

RestTemplate client = new RestTemplate(new HttpComponentsClientHttpRequestFactory());

完整代码如下

 public static String doPatchRequest(String url, HttpHeaders headers, String json) {
        try {
            // 需要指定工厂 HttpComponentsClientHttpRequestFactory
            RestTemplate client = new RestTemplate(new HttpComponentsClientHttpRequestFactory());
            HttpMethod method = HttpMethod.PATCH;
            headers.add("Accept", "application/json");
            headers.add("Content-Type", "application/json");
            HttpEntity<String> requestEntity = new HttpEntity<>(json, headers);

            // 执行HTTP请求，将返回的结构使用String类格式化
            ResponseEntity<String> response = client.exchange(url, method, requestEntity, String.class);
            if (response.getStatusCodeValue() == 200) {
                return response.getBody();
            } else {
                log.info("PATCH请求:{}返回失败，返回码:{}", url, response.getStatusCodeValue());
                return DataConstants.RESULT_FAILED;
            }
        } catch (Exception ex) {
            log.error("PATCH请求异常:" + url, ex);
            return DataConstants.RESULT_FAILED;
        }
    }

调用

 public String updateProject(String authToken, String projectId, String jsonProject) {
        String url = this.host + URI_PROJECT + "/" + projectId;
        HttpHeaders headers = new HttpHeaders();
        headers.set(AUTH_KEY, TOKEN + authToken);

        return RestUtil.doPatchRequest(url, headers, jsonProject);
    }