使用 BeanUtils.copyProperties属性拷贝

配合Beanutils设置对源对象中空的元素不进行复制，避免了目标对象某属性原本不为空，赋值后为空

自定义工具类

import org.springframework.beans.BeanUtils;
import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;

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

public class MyBeanUtils {

    public static void copyProperties(Object source, Object target) {
        BeanUtils.copyProperties(source, target, getNullPropertyNames(source));
    }


    /**
     * 配合Beanutils设置对源对象中空的元素不进行复制，避免了目标对象某属性原本不为空，赋值后为空
     */
    public static String[] getNullPropertyNames(Object source) {
        BeanWrapper src = new BeanWrapperImpl(source);
        java.beans.PropertyDescriptor[] pds = src.getPropertyDescriptors();

        Set<String> emptyNames = new HashSet<String>();
        for (java.beans.PropertyDescriptor pd : pds) {
            Object srcValue = src.getPropertyValue(pd.getName());
            if (srcValue == null) {
                emptyNames.add(pd.getName());
            }
        }
        String[] result = new String[emptyNames.size()];
        return emptyNames.toArray(result);
    }


}
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