code: protected ParamInjector paramNameInject(Method method, int index) {
          if (!Lang.isAndroid) {
              String paramName = getParamRealName(index);
              if (paramName != null) {
                  Class<?> type = argTypes[index];
                  if (type.isArray()) {
                      return new ArrayInjector(paramName,
                              null,
                              type,
                              null,
                              null,
                              true);
                  }
                  if (Modifier.isInterface(type.getModifiers()))
                      return new VoidInjector();
                  return new NameInjector(paramName,
                          null,
                          argTypes[index],
                          null, null);
              }
              else if (log.isInfoEnabled())
                  log.infof("Complie without debug info? can't deduce param name. fail back to PathArgInjector!! index=%d > %s",
                            index,
                            method);
      	}
  
          return new PathArgInjector(method.getParameterTypes()[index]);
      }
docs: 这是最后的大招了,查一下形参的名字,作为@Param("形参名")进行处理