restTemplate 发送http post请求带有文件流、参数

String httpMethod = "";
RestTemplate restTemplate = new RestTemplate();
String args = "";MultiValueMap<String, Object> paramMap = new LinkedMultiValueMap<>();
paramMap.add("args", args);
paramMap.add("sign", "");File file=new File("D:\\5a658c98Nd0abcb82.jpg");
byte[] bytesArray = new byte[(int) file.length()];FileInputStream fis = new FileInputStream(file);
fis.read(bytesArray); //read file into bytes[]
fis.close();ByteArrayResource contentsAsResource = new ByteArrayResource(bytesArray) {
@Override
public String getFilename() {
return "img";
}
};
paramMap.add("img", contentsAsResource);

JSONObject json = restTemplate.postForObject(httpMethod, paramMap, JSONObject.class);

System.out.println("post json : " + json);