code: private VelocityContext toContext(Map<?, ?> bindingMap) {
  		final Map<String, Object> map = Convert.convert(new TypeReference<Map<String, Object>>() {}, bindingMap);
  		return new VelocityContext(map);
  	}
docs: 将Map转为VelocityContext
  
  @param bindingMap 参数绑定的Map
  @return {@link VelocityContext}