核心代码

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public static String HttpRestClient(String url, HttpMethod method, MultiValueMap<String, String> params) throws IOException {
       SimpleClientHttpRequestFactory requestFactory = new SimpleClientHttpRequestFactory();
       requestFactory.setConnectTimeout(10*1000);
       requestFactory.setReadTimeout(10*1000);
       RestTemplate client = new RestTemplate(requestFactory);
       HttpHeaders headers = new HttpHeaders();
       //  请勿轻易改变此提交方式，大部分的情况下，提交方式都是表单提交
       headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
       HttpEntity<MultiValueMap<String, String>> requestEntity = new HttpEntity<MultiValueMap<String, String>>(params, headers);
       //  执行HTTP请求
       ResponseEntity<String> response = client.exchange(url, method, requestEntity, String.class);
       return response.getBody();
}

//api url地址
String url = "";
//post请求
HttpMethod method =HttpMethod.GET;
// 封装参数，千万不要替换为Map与HashMap，否则参数无法传递
MultiValueMap<String, String> params= new LinkedMultiValueMap<String, String>();
//发送http请求并返回结果
String result = HttpUtil.HttpRestClient(url,method,params);

参考锋神丶的《springboot发送http请求》(https://blog.csdn.net/u012613251/article/details/83278713)