How to POST form data with Spring RestTemplate

Question

I want to convert the following  working  curl snippet to a RestTemplate call   curl -i -X POST -d  email first last example com  https   app example com hr email   How do I pass the email parameter correctly  The following code results in a 404 Not Found response   String url    https   app example com hr email    Map lt String  String gt  params   new HashMap lt String  String gt     params put  email    first last example com     RestTemplate restTemplate   new RestTemplate    ResponseEntity lt String gt  response   restTemplate postForEntity  url  params  String class      I ve tried to formulate the correct call in PostMan  and I can get it working correctly by specifying the email parameter as a  form-data  parameter in the body  What is the correct way to achieve this functionality in a RestTemplate

User · Accepted Answer

The POST method should be sent along the HTTP request object. And the request may contain either of HTTP header or HTTP body or both.

Hence let's create an HTTP entity and send the headers and parameter in body.

HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);

MultiValueMap<String, String> map= new LinkedMultiValueMap<String, String>();
map.add("email", "[email protected]");

HttpEntity<MultiValueMap<String, String>> request = new HttpEntity<MultiValueMap<String, String>>(map, headers);

ResponseEntity<String> response = restTemplate.postForEntity( url, request , String.class );

http://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/web/client/RestTemplate.html#postForObject-java.lang.String-java.lang.Object-java.lang.Class-java.lang.Object...-

User · Answer

Your url String needs variable markers for the map you pass to work  like   String url    https   app example com hr email  email      Or you could explicitly code the query params into the String to begin with and not have to pass the map at all  like   String url    https   app example com hr email email first last example com     See also https   stackoverflow com a 47045624 1357094

User · Answer

How to POST mixed data  File  String    String in one request   You can use only what you need   private String doPOST File file  String   array  String name        RestTemplate restTemplate   new RestTemplate true          add file     LinkedMultiValueMap lt String  Object gt  params   new LinkedMultiValueMap lt  gt         params add  file   new FileSystemResource file           add array     UriComponentsBuilder builder   UriComponentsBuilder fromHttpUrl  https   my url        for  String item   array            builder queryParam  array   item                add some String     builder queryParam  name   name          another staff     String result           HttpHeaders headers   new HttpHeaders        headers setContentType MediaType MULTIPART FORM DATA        HttpEntity lt LinkedMultiValueMap lt String  Object gt  gt  requestEntity               new HttpEntity lt  gt  params  headers        ResponseEntity lt String gt  responseEntity   restTemplate exchange              builder build   encode   toUri                HttpMethod POST              requestEntity              String class        HttpStatus statusCode   responseEntity getStatusCode        if  statusCode    HttpStatus ACCEPTED            result   responseEntity getBody              return result      The POST request will have File in its Body and next structure   POST https   my url array your value1 amp array your value2 amp name bob

User · Answer

here is the full program to make a POST rest call using spring s RestTemplate   import java util HashMap  import java util Map   import org springframework http HttpEntity  import org springframework http ResponseEntity  import org springframework util LinkedMultiValueMap  import org springframework util MultiValueMap  import org springframework web client RestTemplate   import com ituple common dto ServiceResponse      public class PostRequestMain        public static void main String   args               TODO Auto-generated method stub         MultiValueMap lt String  String gt  headers   new LinkedMultiValueMap lt String  String gt             Map map   new HashMap lt String  String gt             map put  Content-Type    application json             headers setAll map            Map req payload   new HashMap            req payload put  name    piyush             HttpEntity lt   gt  request   new HttpEntity lt  gt  req payload  headers           String url    http   localhost 8080 xxx xxx             ResponseEntity lt   gt  response   new RestTemplate   postForEntity url  request  String class           ServiceResponse entityResponse    ServiceResponse  response getBody            System out println entityResponse getData

[java] How to POST form data with Spring RestTemplate?

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