利用java内省机制封装实用工具二

使用JDBC技术从数据库中查询出结果集然后要封装到实体对象中供jsp页面显示，当数据库字段比较多时，遍历起来很麻烦，所以写了如下工具方便使用，注：实体类的属性名必须和数据库的字段名一致才可以使用该工具。

public class BeanUtils {
	private BeanUtils() {
	}
  /**
	 * @Description  将结果集封装成实体
	 * @param beanClass  实体字节码对象
	 * @param result    结果集
	 * @return  实体对象
	 * @throws Exception
	 */
	public static <T> T resultToBean(Class<T> beanClass, ResultSet result) throws Exception {
		T instance = null;
		BeanInfo beanInfo = Introspector.getBeanInfo(beanClass, Object.class);
		PropertyDescriptor[] descriptors = beanInfo.getPropertyDescriptors();
		ResultSetMetaData metaData = result.getMetaData();
		if (result.next()) {
			instance = beanClass.newInstance();
			for (int i = 1; i <= metaData.getColumnCount(); i++) {
				String label = metaData.getColumnLabel(i);
				for (PropertyDescriptor property : descriptors) {
					if (label.equals(property.getName())) {
						change(instance, property, property.getWriteMethod(), result.getObject(label) + "");
					}
				}
			}
		}
		return instance;
	}
   
/**
	 * @Description  将结果集封装成实体集合
	 * @param beanClass  实体字节码对象
	 * @param result   结果集
	 * @return  实体集合
	 * @throws Exception
	 */
	public static <T> List<T> resultToList(Class<T> beanClass, ResultSet result) throws Exception {
		List<T> list = new ArrayList<>();
		BeanInfo beanInfo = Introspector.getBeanInfo(beanClass, Object.class);
		PropertyDescriptor[] descriptors = beanInfo.getPropertyDescriptors();
		ResultSetMetaData metaData = result.getMetaData();

		while (result.next()) {
			T instance = beanClass.newInstance();
			for (int i = 1; i <= metaData.getColumnCount(); i++) {
				String label = metaData.getColumnLabel(i);
				for (PropertyDescriptor property : descriptors) {
					if (label.equals(property.getName())) {
						change(instance, property, property.getWriteMethod(), result.getObject(label) + "");
					}
				}
			}
			list.add(instance);
		}
		return list;

	}
       }