BeanUtils（前端赋值给后台，忽略空属性）

package com.drn.core.util;

import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.springframework.beans.BeansException;
import org.springframework.beans.FatalBeanException;
import org.springframework.util.Assert;

public abstract class BeanUtils extends org.springframework.beans.BeanUtils {

	public static void copyProperties(Object source, Object target) throws BeansException {
		Assert.notNull(source, "Source must not be null");
		Assert.notNull(target, "Target must not be null");
		Class<?> actualEditable = target.getClass();
		PropertyDescriptor[] targetPds = getPropertyDescriptors(actualEditable);
		for (PropertyDescriptor targetPd : targetPds) {
			if (targetPd.getWriteMethod() != null) {
				PropertyDescriptor sourcePd = getPropertyDescriptor(source.getClass(), targetPd.getName());
				if (sourcePd != null && sourcePd.getReadMethod() != null) {
					try {
						Method readMethod = sourcePd.getReadMethod();
						if (!Modifier.isPublic(readMethod.getDeclaringClass().getModifiers())) {
							readMethod.setAccessible(true);
						}
						Object value = readMethod.invoke(source);
						// 这里判断以下value是否为空 当然这里也能进行一些特殊要求的处理 例如绑定时格式转换等等
						if (value != null) {
							boolean isEmpty = false;
							if (value instanceof Set) {
								Set s = (Set) value;
								if (s == null || s.isEmpty()) {
									isEmpty = true;
								}
							} else if (value instanceof Map) {
								Map m = (Map) value;
								if (m == null || m.isEmpty()) {
									isEmpty = true;
								}
							} else if (value instanceof List) {
								List l = (List) value;
								if (l == null || l.size() < 1) {
									isEmpty = true;
								}
							} else if (value instanceof Collection) {
								Collection c = (Collection) value;
								if (c == null || c.size() < 1) {
									isEmpty = true;
								}
							}

							if (!isEmpty) {
								Method writeMethod = targetPd.getWriteMethod();
								if (!Modifier.isPublic(writeMethod.getDeclaringClass().getModifiers())) {
									writeMethod.setAccessible(true);
								}
								writeMethod.invoke(target, value);
							}
						}
					} catch (Throwable ex) {
						throw new FatalBeanException("Could not copy properties from source to target", ex);
					}
				}
			}
		}
	}
}