package com.shenmazg6.utils;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;
import org.springframework.beans.BeansException;
import java.util.HashSet;
import java.util.Set;
/**
* @author 军哥
* @version 1.0
* @description: 如果原来是null值,则不进行复制
* @date 2022/7/4 17:24
*/
public class CopyBeanUtils extends BeanUtils {
public static String[] getNullPropertyNames(Object source) {
final BeanWrapper src = new BeanWrapperImpl(source);
java.beans.PropertyDescriptor[] pds = src.getPropertyDescriptors();
Set emptyNames = new HashSet();
for(java.beans.PropertyDescriptor pd : pds) {
//check if value of this property is null then add it to the collection
Object srcValue = src.getPropertyValue(pd.getName());
if (srcValue == null) {
emptyNames.add(pd.getName());
}
}
String[] result = new String[emptyNames.size()];
return (String[]) emptyNames.toArray(result);
}
public static void copy(Object source, Object target) throws BeansException {
copyProperties(source, target, getNullPropertyNames(source));
}
}