spring path variable

path.java

@RequestMapping(
    value = "/{id}.json",
    method = RequestMethod.GET,
    produces = "application/json")
@ResponseBody
public Person getDetailsAsJson(@PathVariable Long id) {
    return personRepo.findOne(id);
}

@RequestMapping(
    value = "/{id}.xml",
    method = RequestMethod.GET,
    produces = "application/xml")
@ResponseBody
public Person getDetailsAsXml(@PathVariable Long id) {
    return personRepo.findOne(id);
}