mybeanutils.java

Jaoso新闻文章发布系统 0.9.1final 程序架构: Struts+Spring+Hibernate 主要功能： ·新闻采用在线编辑器,可以象使用word一样编辑新闻,可简繁

package jaoso.framework.util;

import jaoso.framework.domain.Account;

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.DynaBean;
import org.apache.commons.beanutils.DynaProperty;
import org.apache.commons.beanutils.PropertyUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.beans.PropertyDescriptor;

import java.lang.reflect.InvocationTargetException;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

/**
 * @author Edgeloner
 * @since 2004/6/23
 *  
 */
public class MyBeanUtils extends BeanUtils {
	/** DOCUMENT ME! */
	private static Log log = LogFactory.getLog(MyBeanUtils.class);

	/**
	 * default constructor
	 */
	public MyBeanUtils() {
		super();
	}

	/**
	 * override BeanUtils method copyProperties, support not copy null or blank
	 * property
	 * 
	 * @param dest
	 *            DOCUMENT ME!
	 * @param orig
	 *            DOCUMENT ME!
	 * 
	 * @throws IllegalAccessException
	 *             DOCUMENT ME!
	 * @throws InvocationTargetException
	 *             DOCUMENT ME!
	 * @throws IllegalArgumentException
	 *             DOCUMENT ME!
	 */
	public static void copyProperties(Object dest, Object orig)
			throws IllegalAccessException, InvocationTargetException {
		// Validate existence of the specified beans
		if (dest == null) {
			throw new IllegalArgumentException("No destination bean specified");
		}

		if (orig == null) {
			throw new IllegalArgumentException("No origin bean specified");
		}

		if (log.isDebugEnabled()) {
			log.debug("BeanUtils.copyProperties(" + dest + ", " + orig + ")");
		}

		// Copy the properties, converting as necessary
		if (orig instanceof DynaBean) {
			DynaProperty[] origDescriptors = ((DynaBean) orig).getDynaClass()
					.getDynaProperties();

			for (int i = 0; i < origDescriptors.length; i++) {
				String name = origDescriptors[i].getName();

				if (PropertyUtils.isWriteable(dest, name)) {
					Object value = ((DynaBean) orig).get(name);

					if (value == null) {
						continue;
					}

					if (value instanceof String
							&& MyUtils.isBlank((String) value)) {
						continue;
					}

					copyProperty(dest, name, value);
				}
			}
		} else if (orig instanceof Map) {
			Iterator names = ((Map) orig).keySet().iterator();

			while (names.hasNext()) {
				String name = (String) names.next();

				if (PropertyUtils.isWriteable(dest, name)) {
					Object value = ((Map) orig).get(name);

					if (value == null) {
						continue;
					}

					if (value instanceof String
							&& MyUtils.isBlank((String) value)) {
						continue;
					}

					copyProperty(dest, name, value);
				}
			}
		} else /* if (orig is a standard JavaBean) */
		{
			PropertyDescriptor[] origDescriptors = PropertyUtils
					.getPropertyDescriptors(orig);

			for (int i = 0; i < origDescriptors.length; i++) {
				String name = origDescriptors[i].getName();

				if ("class".equals(name)) {
					continue; // No point in trying to set an object's class
				}

				if (PropertyUtils.isReadable(orig, name)
						&& PropertyUtils.isWriteable(dest, name)) {
					try {
						Object value = PropertyUtils.getSimpleProperty(orig,
								name);

						if (value == null) {
							continue;
						}

						if (value instanceof String
								&& MyUtils.isBlank((String) value)) {
							continue;
						}

						copyProperty(dest, name, value);
					} catch (NoSuchMethodException e) {
						; // Should not happen
					}
				}
			}
		}
	}

	/**
	 * DOCUMENT ME!
	 * 
	 * @param args
	 *            DOCUMENT ME!
	 */
	public static void main(String[] args) {
		Map a = new HashMap();
		Map b = new HashMap();
		a.put("a1", "11111111");
		a.put("a2", "22222222");
		a.put("a3", "33333333");
		b.put("a1", "11111111");
		b.put("a2", null);
		b.put("a3", "");
		System.out.println(a);
		System.out.println(b);

		Account aa = new Account();
		Account bb = new Account();
		aa.setId(null);
		aa.setName("aa");
		bb.setId("id");
		bb.setName("bb");

		try {
			// BeanUtils.copyProperties(a,b);
			System.out.println(aa.getId());
			System.out.println(aa.getName());
			System.out.println("bb" + bb.getId());
			System.out.println("bb" + bb.getName());

			//copyProperty(bb,"id",null);
			copyProperties(bb, aa);
			System.out.println(aa.getId());
			System.out.println(aa.getName());
			System.out.println("bb" + bb.getId());
			System.out.println("bb" + bb.getName());
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		} catch (InvocationTargetException e) {
			e.printStackTrace();
		}
	}
}