how to mime type of the url

Question

Hi , I am using cxf as a webservice.It supports xml and json format output of the requested data.I want to know that if some exception has occured in my code then i want to return him back the error code either in xml or json format.But i dont know when to give json and xml ,it depends on the requested url that user has asked.

example

@Path("/reports/ad-view/loginId/{loginId}/publisher/")

PublisherReports getPublisherReportsAdView(

  @PathParam("loginId") String loginId,
  @QueryParam("fromDate") String fromDate,
  @QueryParam("toDate") String toDate,
  @QueryParam("filterValue") String filterValue);

Answer 1

If you mean you want to detect the mime type used to make the request, then you can use the @Consumes annotation to dictate which method handles which type of request. So you could write:

// Called when an XML request is made
@Path("/reports/ad-view/loginId/{loginId}/publisher/")
@Consumes("application/xml")
PublisherReports getPublisherReportsAdViewXml(...

and:

// Called when a JSON request is made
@Path("/reports/ad-view/loginId/{loginId}/publisher/")
@Consumes("application/json")
PublisherReports getPublisherReportsAdViewJson(...

Then have each variant of the getPublisherReportsAdView() method call a common method to perform the actual processing logic but still handle exceptions differently depending on the method that gets called.

Answer 2

An alternative approach, which doesn't require additional methods, would be to add a parameter which is annotated with the @HeaderParam annotation and use that to hold the value of the 'Content-Type' request header.

e.g.:

PublisherReports getPublisherReportsAdView(
                @PathParam("loginId") String loginId,
                @QueryParam("fromDate") String fromDate,
                @QueryParam("toDate") String toDate,
                @QueryParam("filterValue") String filterValue,
                @HeaderParam("Content-Type") String contentType)
{
  ...

The value of contentType will likely also include charset information, for example: application/json; charset=UTF-8 so you'll need to ignore that when working out if the request contained JSON or XML.