How to set an “Accept:” header on Spring RestTemplate request?

I want to set the value of the Accept: in a request I am making using Spring’s RestTemplate.

Here is my Spring request handling code

@RequestMapping(
    value= "/uom_matrix_save_or_edit", 
    method = RequestMethod.POST,
    produces="application/json"
)
public @ResponseBody ModelMap uomMatrixSaveOrEdit(
    ModelMap model,
    @RequestParam("parentId") String parentId
){
    model.addAttribute("attributeValues",parentId);
    return model;
}

and here is my Java REST client:

public void post(){
    MultiValueMap<String, String> params = new LinkedMultiValueMap<String, String>();
    params.add("parentId", "parentId");
    String result = rest.postForObject( url, params, String.class) ;
    System.out.println(result);
}

This works for me; I get a JSON string from the server side.

My question is: how can I specify the Accept: header (e.g. application/json,application/xml, … ) and request method (e.g. GET,POST, … ) when I use RestTemplate?