Sean Patrick Floyd Sean Patrick Floyd - 1 year ago 192
Java Question

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

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")
public String fooBar(){
return myService.getJson();

The business objects are already available as JSON strings, so using
is not the solution for me.
is perfect, but how can I set the mimetype?

Answer Source

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")
public Bar fooBar(){
    return myService.getBar();


First, the <mvc:annotation-driven /> 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).

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