In Spring MVC how can I set the mime type header when using ResponseBody

Question

I have a Spring MVC Controller that returns a JSON String and I would like to set the mimetype to application json  How can I do that    RequestMapping method RequestMethod GET  value  foo bar    ResponseBody public String fooBar        return myService getJson        The business objects are already available as JSON strings  so using MappingJacksonJsonView is not the solution for me   ResponseBody is perfect  but how can I set the mimetype

User · Answer

My version of reality   Loading a HTML file and streaming to the browser    Controller  RequestMapping      public class UIController         RequestMapping value  index   method RequestMethod GET  produces    text html       public  ResponseBody String GetBootupFile   throws IOException            Resource resource   new ClassPathResource  MainPage html            String fileContents   FileUtils readFileToString resource getFile             return fileContents

User · Answer

I would consider to refactor the service to return your domain object rather than JSON strings and let Spring handle the serialization  via the MappingJacksonHttpMessageConverter as you write   As of Spring 3 1  the implementation looks quite neat    RequestMapping produces   MediaType APPLICATION JSON VALUE       method   RequestMethod GET     value     foo bar    ResponseBody public Bar fooBar        return myService getBar        Comments   First  the  lt mvc annotation-driven   gt  or the  EnableWebMvc must be added to your application config   Next  the produces attribute of the  RequestMapping annotation is used to specify the content type of the response  Consequently  it should be set to MediaType APPLICATION JSON VALUE  or  application json     Lastly  Jackson must be added so that any serialization and de-serialization between Java and JSON will be handled automatically by Spring  the Jackson dependency is detected by Spring and the MappingJacksonHttpMessageConverter will be under the hood

User · Answer

I don t think you can  apart from response setContentType

User · Answer

Use ResponseEntity instead of ResponseBody  This way you have access to the response headers and you can set the appropiate content type  According to the Spring docs      The HttpEntity is similar to    RequestBody and  ResponseBody    Besides getting access to the request   and response body  HttpEntity  and the   response-specific subclass   ResponseEntity  also allows access to   the request and response headers   The code will look like    RequestMapping method RequestMethod GET  value   fooBar   public ResponseEntity lt String gt  fooBar2         String json    jsonResponse       HttpHeaders responseHeaders   new HttpHeaders        responseHeaders setContentType MediaType APPLICATION JSON       return new ResponseEntity lt String gt  json  responseHeaders  HttpStatus CREATED

User · Answer

Register org springframework http converter json MappingJacksonHttpMessageConverter as the message converter and return the object directly from the method    lt bean class  org springframework web servlet mvc annotation AnnotationMethodHandlerAdapter  gt     lt property name  webBindingInitializer  gt       lt bean class  org springframework web bind support ConfigurableWebBindingInitializer   gt     lt  property gt     lt property name  messageConverters  gt       lt list gt         lt bean class  org springframework http converter json MappingJacksonHttpMessageConverter   gt       lt  list gt     lt  property gt   lt  bean gt    and the controller    RequestMapping method RequestMethod GET  value  foo bar   public  ResponseBody Object fooBar        return myService getActualObject        This requires the dependency org springframework spring-webmvc

User · Answer

You may not be able to do it with  ResponseBody  but something like this should work   package xxx   import java io ByteArrayOutputStream  import java io IOException   import javax servlet http HttpServletResponse   import org springframework stereotype Controller  import org springframework web bind annotation RequestMapping  import org springframework web bind annotation RequestMethod    Controller public class FooBar      RequestMapping value  foo bar   method   RequestMethod GET    public void fooBar HttpServletResponse response  throws IOException       ByteArrayOutputStream out   new ByteArrayOutputStream        out write myService getJson   getBytes         response setContentType  application json        response setContentLength out size         response getOutputStream   write out toByteArray         response getOutputStream   flush

User · Answer

I don t think this is possible  There appears to be an open Jira for it   SPR-6702  Explicitly set response Content-Type in  ResponseBody

[java] In Spring MVC, how can I set the mime type header when using @ResponseBody

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