BeanCopyUtil

package com.rscode.credits.util;

import java.util.HashSet;
import java.util.Set;

import org.springframework.beans.BeanUtils;
import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;
/**
* @author 作者 tn
* @version 创建时间：2018年11月13日
* 类说明   复制bean
*/
public class BeanCopyUtil {
    //source中的非空属性复制到target中
    /**
     *
     * @param source 源
     * @param target 目标
     */
    public static <T> void beanCopy(T source, T target) {
        BeanUtils.copyProperties(source, target, getNullPropertyNames(source));
    }
    //source中的非空属性复制到target中，但是忽略指定的属性，也就是说有些属性是不可修改的（个人业务需要）
    public static <T> void beanCopyWithIngore(T source, T target, String... ignoreProperties) {
        String[] pns = getNullAndIgnorePropertyNames(source, ignoreProperties);
        BeanUtils.copyProperties(source, target, pns);
    }
    public static String[] getNullAndIgnorePropertyNames(Object source, String... ignoreProperties) {
        Set<String> emptyNames = getNullPropertyNameSet(source);
        for (String s : ignoreProperties) {
            emptyNames.add(s);
        }
        String[] result = new String[emptyNames.size()];
        return emptyNames.toArray(result);
    }
    public static String[] getNullPropertyNames(Object source) {
        Set<String> emptyNames = getNullPropertyNameSet(source);
        String[] result = new String[emptyNames.size()];
        return emptyNames.toArray(result);
    }
    public static Set<String> getNullPropertyNameSet(Object source) {
        final BeanWrapper src = new BeanWrapperImpl(source);
        java.beans.PropertyDescriptor[] pds = src.getPropertyDescriptors();
        Set<String> emptyNames = new HashSet<>();
        for (java.beans.PropertyDescriptor pd : pds) {
        Object srcValue = src.getPropertyValue(pd.getName());
        if (srcValue == null) emptyNames.add(pd.getName());
        }
        return emptyNames;
    }
}