code: public short getRequstURIPath(String prefix, short defvalue) {
          String val = getRequstURIPath(prefix, null);
          try {
              return val == null ? defvalue : Short.parseShort(val);
          } catch (NumberFormatException e) {
              return defvalue;
          }
      }
docs: 获取请求URL分段中含prefix段的short值   <br>
  例如请求URL /pipes/record/query/type:10   <br>
  获取type参数: short type = request.getRequstURIPath("type:", (short)0);
  
  @param prefix   prefix段前缀
  @param defvalue 默认short值
  
  @return short值