1. BeanUtils.copyProperties(Object source, Object target)
用法: 讲 source 的属性值复制到 target，属性为 null 时也会进行复制。
需求：排除 null 值进行复制
public class CopyObjectUtil {
public static String[] getNullPropertyNames(Object source) {
final 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);
}
public static void copyPropertiesIgnoreNull(Object src, Object target) {
BeanUtils.copyProperties(src, target, getNullPropertyNames(src));
}
}
使用方式与 BeanUtils.copyProperties 相同:
CopyObjectUtil.copyPropertiesIgnoreNull(Object source, Object target);
2. BeanUtils.copyProperties(Object source, Object target, new String[] {“id”, “createDate”, “modifyDate”})
用法：排除指定字段进行复制