如何替换@PathVariable中的变量

Map<String, String> pathVariables = (Map) request.getAttribute(HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE);

import com.google.common.base.Joiner;
import javax.servlet.*;
  /**
   * 获取 去除掉 PathVariable 后的uri
   * @param request
   * @return
   */
  private String getPureUri(HttpServletRequest request) {
    String url = request.getRequestURI();
    Map<String, String> pathVariables = (Map) request.getAttribute(HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE);
     if (pathVariables != null && !pathVariables.isEmpty()){
      String[] split = url.split("/");
      for (String pathVal : pathVariables.values()) {
        for (int i = split.length - 1; i >= 0; i--) {
          if (split[i].equals(pathVal)){
            //替换成{x},也可以直接替换成""去掉
            split[i] = "{x}";
            break;
          }
        }
      }
      url = Joiner.on("/").join(split);
    }
    return url;
  }

    //@GetMapping是一个组合注解，是@RequestMapping(method = RequestMethod.GET)的缩写
    @GetMapping("/getUserById/{id}")
    public User getUser(@PathVariable("id") Long userId){
        return userService.selectUserById(userId);
    }

    //@GetMapping是一个组合注解，是@RequestMapping(method = RequestMethod.GET)的缩写。
    @GetMapping("/getUserByName/{userName}")
    public User getUserByName(@PathVariable String userName){
        return userService.selectUserByUserName(userName);
    }