send-multipart-file-using-spring-rest-template.java

package studio.safe.spring.resttemplate;


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);
    }
}

Can i use MultipartFile instead of FileSystemResource?

of course not, here is the reason
spring-projects/spring-framework#18147

Thanks a lot, this worked like a charm. I was looking for solution for hours.

Wow Lot of thanks , You Rock!

I want to convert "byte [ ] response to Multipart"?

here is my controller-

@GetMapping("/reportpdf1")
public ResponseEntity<byte[]> pdfReport1( ) {
byte[] response = null;
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_PDF);
String filename = "";
headers.setCacheControl("must-revalidate, post-check=0, pre-check=0");
filename = "steve.pdf";
headers.setContentDispositionFormData(filename, filename);
response = pdfservice.pdfReport1( );
return new ResponseEntity<>(response,headers, HttpStatus.OK);
}