反射实体Bean 拷贝实体Bean数据

最新推荐文章于 2020-07-12 23:00:40 发布

cranedingNO1

最新推荐文章于 2020-07-12 23:00:40 发布

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分类专栏： JAVA 文章标签： Bean

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本文介绍了一个使用Java实现的对象复制示例，通过反射机制遍历源对象的所有属性，并将其复制到目标对象中。此方法适用于拥有相同属性类型的两个对象。

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public class MyMethod {

	private static class MethodBean {
		private int MethodId;
		private String MethodName;

		public int getMethodId() {
			return MethodId;
		}

		public void setMethodId(int methodId) {
			MethodId = methodId;
		}

		public String getMethodName() {
			return MethodName;
		}

		public void setMethodName(String methodName) {
			MethodName = methodName;
		}
	}

	protected MethodBean createMethodBean(int id, String name) {
		MethodBean bean = new MethodBean();
		bean.setMethodId(id);
		bean.setMethodName(name);
		return bean;
	}

	/**
	 * copy object1's data to object2
	 */
	protected void CopyBean(Object object1, Object object2)
			throws IntrospectionException, IllegalArgumentException,
			IllegalAccessException, InvocationTargetException {
		BeanInfo beanInfo1 = Introspector.getBeanInfo(object1.getClass());
		BeanInfo beanInfo2 = Introspector.getBeanInfo(object2.getClass());

		//获得 object1 beans PropertyDescriptor
		PropertyDescriptor[] descriptors1 = beanInfo1.getPropertyDescriptors();
		//获得 object2 beans PropertyDescriptor
		PropertyDescriptor[] descriptors2 = beanInfo2.getPropertyDescriptors();

		for (PropertyDescriptor descriptor1 : descriptors1) {
			for (PropertyDescriptor descriptor2 : descriptors2) {
				if (descriptor1.getName().equals(descriptor2.getName())) {
					//获得应该用于读取属性值的方法。
					Method readMethod = descriptor1.getReadMethod();
					//获得应该用于写入属性值的方法。
					Method writeMethod = descriptor2.getWriteMethod();
					if (readMethod == null || writeMethod == null)
						continue;
					//对带有指定参数的指定对象调用由此 Method 对象表示的基础方法。
					Object object = readMethod.invoke(object1);
					writeMethod.invoke(object2, object);
					continue;
				}
			}
		}
	}

	public static void main(String[] args) throws IntrospectionException,
			IllegalArgumentException, IllegalAccessException,
			InvocationTargetException {
		MyMethod myMethod = new MyMethod();

		MethodBean bean_1 = myMethod.createMethodBean(2008, "MyMethod One");
		MethodBean bean_2 = new MethodBean();
		myMethod.CopyBean(bean_1, bean_2);

		System.out.println("object1 id = " + bean_1.getMethodId());
		System.out.println("object1 name = " + bean_1.getMethodName());

		System.out.println("object2 id = " + bean_2.getMethodId());
		System.out.println("object1 name = " + bean_2.getMethodName());
	}
}