code: private void setField(Field field, Object targetObject, Object value) throws UnmarshalException{
  		field.setAccessible(true);
  		try {
  			field.set(targetObject, value);
  		} catch (IllegalArgumentException e) {
  			throw new UnmarshalException(e);
  		} catch (IllegalAccessException e) {
  			throw new UnmarshalException(e);
  		}
  	}
docs: /*
  执行字段, 将Node或Attribute的内容写入对象属性中