mybeanutils.java

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package com.ponyjava.common.util;

import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.beanutils.PropertyUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.Assert;

public class MyBeanUtils {
	protected static Logger logger = LoggerFactory.getLogger(MyBeanUtils.class);

	/**
	 * 获得同时有get和set的field和value。
	 * 
	 * @param bean
	 * @return
	 */
	@SuppressWarnings("unchecked")
	public static Map describe(Object bean) {
		Map des = new HashMap();
		PropertyDescriptor desor[] = PropertyUtils.getPropertyDescriptors(bean);
		String name = null;
		for (int i = 0; i < desor.length; i++) {
			if (desor[i].getReadMethod() != null
					&& desor[i].getWriteMethod() != null) {
				name = desor[i].getName();
				try {
					des.put(name, PropertyUtils.getProperty(bean, name));
				} catch (Exception e) {
					throw new RuntimeException("属性不存在：" + name);
				}
			}
		}
		return des;
	}

	public static void setSimpleProperty(Object bean, String name, Object value) {
		try {
			PropertyUtils.setSimpleProperty(bean, name, value);
		} catch (Exception e) {
			throw new RuntimeException("属性不存在：" + name);
		}
	}

	public static Object setSimpleProperty(Object bean, String name) {
		try {
			return PropertyUtils.getSimpleProperty(bean, name);
		} catch (Exception e) {
			throw new RuntimeException("属性不存在：" + name);
		}
	}

	/**
	 * 直接读取对象属性值,无视private/protected修饰符,不经过getter函数.
	 */
	public static Object getFieldValue(Object object, String fieldName)
			throws NoSuchFieldException {
		Field field = getDeclaredField(object, fieldName);
		if (!field.isAccessible()) {
			field.setAccessible(true);
		}

		Object result = null;
		try {
			result = field.get(object);
		} catch (IllegalAccessException e) {
			logger.error("不可能抛出的异常{}", e.getMessage());
		}
		return result;
	}

	/**
	 * 直接设置对象属性值,无视private/protected修饰符,不经过setter函数.
	 */
	public static void setFieldValue(Object object, String fieldName,
			Object value) throws NoSuchFieldException {
		Field field = getDeclaredField(object, fieldName);
		if (!field.isAccessible()) {
			field.setAccessible(true);
		}
		try {
			field.set(object, value);
		} catch (IllegalAccessException e) {
			logger.error("不可能抛出的异常:{}", e.getMessage());
		}
	}

	/**
	 * 循环向上转型,获取对象的DeclaredField.
	 */
	public static Field getDeclaredField(Object object, String fieldName)
			throws NoSuchFieldException {
		Assert.notNull(object);
		return getDeclaredField(object.getClass(), fieldName);
	}

	/**
	 * 循环向上转型,获取类的DeclaredField.
	 */
	@SuppressWarnings("unchecked")
	public static Field getDeclaredField(Class clazz, String fieldName)
			throws NoSuchFieldException {
		Assert.notNull(clazz);
		Assert.hasText(fieldName);
		for (Class superClass = clazz; superClass != Object.class; superClass = superClass
				.getSuperclass()) {
			try {
				return superClass.getDeclaredField(fieldName);
			} catch (NoSuchFieldException e) {
				// Field不在当前类定义,继续向上转型
			}
		}
		throw new NoSuchFieldException("No such field: " + clazz.getName()
				+ '.' + fieldName);
	}
}