@PathVariable 处理参数为空的情况

@RequestMapping(value = "/get/{id}/{userId}", method = RequestMethod.GET)
    public Result getMemberShip(@PathVariable("id") int id,@PathVariable("userId") int userId) {

假如id为非必需参数

//可以指定多个匹配路径

@RequestMapping(value = {"/get/{userId}", "/get/{id}/{userId}"}, method = RequestMethod.GET)

//然后设置参数非必须

@PathVariable(required = false) String id