java bean 合并

package com.hainabo.mgcmall.util;

import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;

public class BeanUtils {

    public static <M> void merge(M target, M destination) throws Exception {
        BeanInfo beanInfo = Introspector.getBeanInfo(target.getClass());

        // 遍历所有属性
        for (PropertyDescriptor descriptor : beanInfo.getPropertyDescriptors()) {
            // 允许读写
            if (descriptor.getWriteMethod() != null) {
                //Object originalValue = descriptor.getReadMethod().invoke(target);//target中（descriptor）的值
                // Only copy values values where the destination values is null
                //if (originalValue == null) {
                    Object defaultValue = descriptor.getReadMethod().invoke(destination);//destination中（descriptor）的值
                    if(defaultValue!=null && !"".equals(defaultValue)){
                        descriptor.getWriteMethod().invoke(target, defaultValue);//用defaultValue覆盖到target
                    }
                //}
            }
        }
    }
}

此方法会将  destination中！""&！null 的值覆盖到 target中