restemplate发送post请求，请求体使用form-data格式_resttemplate post请求 参数是 body里的form-data 形式 怎么写

	String url = "111.111.111.112";
	RestTemplate restTemplate= new RestTemplate();
	HttpHeaders headers = new HttpHeaders();
	MultiValueMap<String, Object> map = new LinkedMultiValueMap<>();
	map.add("client_id","testId");
	map.add("client_secret","testData");
    //头部类型
    headers.setContentType(MediaType.MULTIPART_FORM_DATA);
    HttpEntity<MultiValueMap<String, Object>> params = new HttpEntity<>(map, headers);
    ResponseEntity<String> accessResult = restTemplate.postForEntity(accessTokenUri, params, String.class);

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