Java spring framework - how to set content type?

问题:

I have a spring action that I am rendering some json from the controller, at the minute its returning the content type 'text/plain;charset=ISO-8859-1'.

How can I change this to be 'application/json'?

回答1:

Pass the HttpServletResponse to your action method and set the content type there:

public String yourAction(HttpServletResponse response) {
    response.setContentType("application/json");
}

回答2:

Did you try using the MappingJacksonJsonView?

Spring-MVC View that renders JSON content by serializing the model for the current request using Jackson's ObjectMapper.

It sets the content-type to: application/json.

回答3:

 @RequestMapping(value = "jsonDemoDude", method = RequestMethod.GET)
    public void getCssForElasticSearchConfiguration(HttpServletResponse response) throws IOException {        
        String jsonContent= ...;
        HttpServletResponseWrapper wrapper = new HttpServletResponseWrapper(response);
        wrapper.setContentType("application/json;charset=UTF-8");
        wrapper.setHeader("Content-length", "" + jsonContent.getBytes().length);
        response.getWriter().print(jsonContent);
}

You can also add the aditional X bytes or whatever for "callback" part in case you want JSONP ( cross site json request ) .

回答4:

Yes, but this only works if one is grabbing the HttpServletResponse in the controller.

In Spring 3 we're being encouraged to avoid references to anything in the servlet domain, keeping things solely to our POJOs and annotations. Is there a way to do this without referencing the HttpServletResponse? I.e., keeping ourselves pure?