apache，spring工具包

Apache Commons组件有关日期的处理主要有五个类，
DateFormatUtils
DateUtils
DurationFormatUtils
FastDateFormat
StopWatch

sprign
属性拷贝　，null的也被复制了，需要重写一下
org.springframework.beans.BeanUtils

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