使用RestTemplate发送multipart/form-data格式的数据

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

//设置请求头(注意会产生中文乱码)
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.MULTIPART_FORM_DATA);

HttpEntity<MultiValueMap<String, String>> request = new HttpEntity<MultiValueMap<String, String>>(
popHeaders(obj), headers);
//发送请求，设置请求返回数据格式为String
ResponseEntity<String> responseEntity = restTemplate.postForEntity("http:xxx.xx", request, String.class);

}
//组装请求体
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;
}

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

//对中文格式数据进行处理
FormHttpMessageConverter fc = new FormHttpMessageConverter();
StringHttpMessageConverter stringConverter = new StringHttpMessageConverter(StandardCharsets.UTF_8);
List<HttpMessageConverter<?>> partConverters = new ArrayList<HttpMessageConverter<?>>();
partConverters.add(stringConverter);
partConverters.add(new ResourceHttpMessageConverter());
fc.setPartConverters(partConverters);
restTemplate.getMessageConverters().addAll(Arrays.asList(fc,new MappingJackson2HttpMessageConverter()));

//发送请求，设置请求返回数据格式为String（去除上面方法中使用的httpEntity）
ResponseEntity<String> responseEntity = restTemplate.postForEntity("http:xxx.xx", popHeaders(obj), String.class);

}
//组装请求体
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;
}