Send Multipart file in resttemplate Java Spring

import java.io.File;

import java.io.IOException;

import org.springframework.core.io.FileSystemResource;

import org.springframework.http.HttpEntity;

import org.springframework.http.HttpHeaders;

import org.springframework.http.HttpMethod;

import org.springframework.http.MediaType;

import org.springframework.util.LinkedMultiValueMap;

import org.springframework.web.client.RestTemplate;

public class Application {

public static void main(String[] args) throws IOException {

LinkedMultiValueMap<String, Object> map = new LinkedMultiValueMap<>();

FileSystemResource value = new FileSystemResource(new File("D://test.png"));

map.add("file", value);

HttpHeaders headers = new HttpHeaders();

headers.setContentType(MediaType.MULTIPART_FORM_DATA);

HttpEntity<LinkedMultiValueMap<String, Object>> requestEntity = new HttpEntity<>(map, headers);

RestTemplate restTemplate = new RestTemplate();

restTemplate.exchange("http://localhost/api/v1/users/avatar", HttpMethod.POST, requestEntity, String.class);

}

}

ref: https://gist.github.com/ansidev/5816b8b3108c30b5279f5fec67506798