public List<DeliverAddressDTO> selectByUserId(String userId) {
//根据userId查询
List<DeliverAddress> deliverAddresses = addressMapper.selectByUserId(userId);
//new一个长度为entity实体类List.size()的DTO数组
DeliverAddressDTO[] deliverAddressDTOs = new DeliverAddressDTO[deliverAddresses.size()];
//把DeliverAddress的属性复制到DTO
for (int i = 0; i < deliverAddresses.size(); i++) {
deliverAddressDTOs[i] = new DeliverAddressDTO();
BeanUtils.copyProperties(deliverAddresses.toArray()[i], deliverAddressDTOs[i]);
}
//把DTO数组转换为List
List<DeliverAddressDTO> deliverAddressDTOS = Arrays.asList(deliverAddressDTOs);
return deliverAddressDTOS;
}
在上面的代码中,我需要要把deliverAddresses的属性依次赋值到deliverAddressDTOS中,必须先通过遍历数组复制,否则会报错。遍历过程中,不要忘记new DTO()对象,否则会报java.lang.IllegalArgumentException: Target must not be null异常!
版权声明:本文为baidu_38287567原创文章,遵循CC 4.0 BY-SA版权协议,转载请附上原文出处链接和本声明。