現有業務場景需要使用RestTemplate發送一個post請求，請求格式為multipart/form-data的，可以使用一下方法

public Object sendRequest(Object obj) {
        RestTemplate restTemplate = new RestTemplate();

        //設置請求頭
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.MULTIPART_FORM_DATA);

        HttpEntity
 
<MultiValueMap<String, String>> request = new HttpEntity<MultiValueMap<String, String>>(
                popHeaders(obj), headers);
         //發送請求，設置請求返回數據格式為String
        ResponseEntity<String> responseEntity = restTemplate.postForEntity("http:xxx.xx", request, String.class
 
);
                
}
//組裝請求體
protected MultiValueMap<String, String> popHeaders(Object obj) {
        SubmitOrderDTO submit = (SubmitOrderDTO) obj;
        MultiValueMap<String, String> map = new LinkedMultiValueMap<String, String>();

        map.add("order_id", submit.getOrderId());
        map.add(
 
"userName",submit.getUserName());
        //.....
        return map;
}

使用RestTemplate發送multipart/form-data格式的數據