属性拷贝MapStruct

端请求通过VO对象接收，并通过DTO对象进行流转，最后转换成DO对象与数据库DAO层进行交互，反之亦然。

当业务简单的时候，可以通过手动编码getter/setter函数来复制对象属性。但是当业务变的复杂，对象属性变得很多，那么手写复制属性代码不仅十分繁琐，非常耗时间，并且还可能容易出错。

为了解决这个痛点，在项目初期，项目的解决方法是随手写的转换工具函数：根据变量名进行反射，对基础类型和枚举的变量进行赋值。

总结下目前该工具函数的优缺点：

优点：

1. 开发效率高，随时想要转换的时候，传入源对象以及指定class，调用下函数即可。

缺点：

1. 项目中大量的反射会严重影响代码执行效率
2. 由于使用了反射，所以成员变量的使用被追踪就很麻烦
3. 转换失败只有在运行中报错才会发现
4. 对于嵌套对象字段的情况无能为力
5. 只能对基础类型进行复制
6. 对字段名不一致的属性无法赋值

接下来就要介绍MapStruct 这个工具类，这个工具类之所以运行速度与硬编码差不多，这是因为MapStruct在编译期间就生成属性复制的代码，运行期间就无需使用反射或者字节码技术，从而确保了高性能。

另外，由于编译期间就生成了代码，所以如果有任何问题，编译期间就可以提前暴露，这对于开发人员来讲就可以提前解决问题，而不用等到代码应用上线了，运行之后才发现错误。

所以，为了克服项目中当前函数的被提到的五个缺点，笔者引入了MapStruct。

2. 如何引入MapStruct

只需要引入MapStruct的依赖，同时由于MapStruct需要在编译器期间生成代码，所以我们需要maven-compiler-plugin插件中配置

复制

// pom.xml<dependency><groupId>org.MapStruct</groupId><artifactId>MapStruct</artifactId><version>1.4.1.Final</version></dependency>

.高效性：

1.编译期   自动生成映射代码          

类型检查报错

2.灵活性：支持复杂映射（对象、集合列表）  

   支持属性不同字段名、类型的赋值

3.直观性：使用注解来定义映射规则     （根据需求指定返回类型、忽略属性，添加        条件判断来决定是否执行映射操作） 

 

package com.mdgyl.hussar.basic.supplier.changeorder.converter.struct;import com.mdgyl.common.util.DateUtils;
import com.mdgyl.hussar.basic.model.supplier.masterdata.*;
import com.mdgyl.hussar.basic.model.supplier.supplierchangeorder.*;
import com.mdgyl.hussar.basic.supplier.changeorder.domain.*;
import org.apache.commons.lang3.StringUtils;
import org.mapstruct.Mapper;
import org.mapstruct.Mapping;
import org.mapstruct.Mappings;
import org.mapstruct.factory.Mappers;import java.math.BigDecimal;
import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Date;@Mapper
public interface ChangeOrderMapperConverter {ChangeOrderMapperConverter INSTANCE = Mappers.getMapper(ChangeOrderMapperConverter.class);@Mappings({@Mapping(target = "score", expression = "java(exchangeRateDO.getScore() == null? null:exchangeRateDO.getScore().toString())"),@Mapping(target = "operatingStartTime", expression = "java(exchangeRateDO.getOperatingStartTime() == null? null:formatDate(exchangeRateDO.getOperatingStartTime()))"),})SupplierChangeOrderModel doToModel(SupplierChangeOrderDo exchangeRateDO);@Mappings({@Mapping(target = "id", ignore = true),@Mapping(source = "tenantId", target = "tenantId"),@Mapping(target = "status", ignore = true),@Mapping(source = "id", target = "supplierDataId"),@Mapping(target = "deleteFlag", constant = "0")})SupplierChangeOrderModel converterSupplierToChangeOrder(SupplierModel supplierModel);@Mappings({@Mapping(target = "id", ignore = true),@Mapping(source = "id", target = "supplierAddressId")})SupplierChangeOrderAddressModel convertAddressesModel(SupplierAddressModel supplierAddressModel);@Mappings({@Mapping(target = "id", ignore = true),@Mapping(source = "id", target = "supplierBankId")})SupplierChangeOrderBankModel convertBankModel(SupplierBankModel supplierBankModel);@Mappings({@Mapping(target = "id", ignore = true),@Mapping(source = "id", target = "supplierContactsId"),})SupplierChangeOrderContactsModel convertContactModel(SupplierContactsModel supplierContactsModel);@Mappings({@Mapping(target = "id", ignore = true),@Mapping(source = "id", target = "supplierInfoId"),})SupplierChangeOrderInfoModel convertOderInfoModel(SupplierInfoModel supplierInfo);@Mappings({@Mapping(target = "score", expression = "java(parseBigDecimal(supplierChangeOrderModel.getScore()))"),@Mapping(target = "operatingStartTime", expression = "java(supplierChangeOrderModel.getOperatingStartTime() == null ? null : parseDate(supplierChangeOrderModel.getOperatingStartTime()))"),})SupplierChangeOrderDo converterModelToDo(SupplierChangeOrderModel supplierChangeOrderModel);@Mappings({@Mapping(target = "taxRate", expression = "java(parseBigDecimal(supplierChangeOrderModel.getTaxRate()))"),@Mapping(target = "staffSize", expression = "java(supplierChangeOrderModel.getStaffSize() == null || supplierChangeOrderModel.getStaffSize().isEmpty() ? null : new Integer(supplierChangeOrderModel.getStaffSize()))"),@Mapping(target = "numberOfInsured", expression = "java(supplierChangeOrderModel.getNumberOfInsured() == null || supplierChangeOrderModel.getNumberOfInsured().isEmpty() ? null : new Integer(supplierChangeOrderModel.getNumberOfInsured()))")})SupplierChangeOrderInfo converterInfoModelToDo(SupplierChangeOrderInfoModel supplierChangeOrderModel);SupplierChangeOrderAddress converterAddressModelToDo(SupplierChangeOrderAddressModel supplierChangeOrderAddressModel);SupplierChangeOrderBank converterBankModelToDo(SupplierChangeOrderBankModel supplierChangeOrderBankModel);SupplierChangeOrderContacts converterContactsModel(SupplierChangeOrderContactsModel supplierChangeOrderContactsModel);@Mappings({@Mapping(target = "taxRate", expression = "java(supplierInfo.getTaxRate() == null? null:supplierInfo.getTaxRate().toString())"),@Mapping(target = "staffSize", expression = "java(supplierInfo.getStaffSize() == null? null:supplierInfo.getStaffSize().toString())"),@Mapping(target = "numberOfInsured", expression = "java(supplierInfo.getNumberOfInsured() == null? null:supplierInfo.getNumberOfInsured().toString())")})SupplierChangeOrderInfoModel converterInfoDoToModel(SupplierChangeOrderInfo supplierInfo);SupplierChangeOrderAddressModel convertAddressesDoToModel(SupplierChangeOrderAddress supplierChangeOrderAddress);SupplierChangeOrderContactsModel convertContactsDoToModel(SupplierChangeOrderContacts supplierChangeOrderContacts);SupplierChangeOrderBankModel convertBankDoToModel(SupplierChangeOrderBank supplierChangeOrderContacts);@Mappings({@Mapping(source = "supplierDataId", target = "id"),@Mapping(source = "status", target = "status", ignore = true),@Mapping(target = "score", expression = "java(parseBigDecimal(changeOrderModel.getScore()))"),@Mapping(target = "operatingStartTime", expression = "java(parseLocalDateTime(changeOrderModel.getOperatingStartTime()))")})SupplierModel converterChangeOrderToSupplier(SupplierChangeOrderModel changeOrderModel);@Mappings({@Mapping(source = "supplierInfoId", target = "id"),@Mapping(target = "staffSize", expression = "java(changeOrderInfo.getStaffSize() == null|| changeOrderInfo.getStaffSize().isEmpty() ? null : Integer.parseInt(changeOrderInfo.getStaffSize()))"),@Mapping(target = "taxRate", expression = "java(parseBigDecimal(changeOrderInfo.getTaxRate()))"),@Mapping(target = "numberOfInsured", expression = "java(changeOrderInfo.getNumberOfInsured() == null || changeOrderInfo.getNumberOfInsured().isEmpty()? null : Integer.parseInt(changeOrderInfo.getNumberOfInsured()))"),})SupplierInfoModel convertOderInfoToSupplierModel(SupplierChangeOrderInfoModel changeOrderInfo);@Mappings({@Mapping(source = "supplierAddressId", target = "id")})SupplierAddressModel convertAddressesToSupplierModel(SupplierChangeOrderAddressModel supplierChangeOrderAddressModel);@Mappings({@Mapping(source = "supplierBankId", target = "id")})SupplierBankModel convertBankToSupplierModel(SupplierChangeOrderBankModel supplierBankModel);@Mappings({@Mapping(source = "supplierContactsId", target = "id"),})SupplierContactsModel convertContactToSupplierModel(SupplierChangeOrderContactsModel supplierContactsModel);default Date parseDate(String dateString) {SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");try {return format.parse(dateString);} catch (Exception e) {e.printStackTrace();return null;}}default BigDecimal parseBigDecimal(String taxRate) {if (StringUtils.isEmpty(taxRate)) {return null;}return new BigDecimal(taxRate);}default String formatDate(Date date) {SimpleDateFormat format = new SimpleDateFormat(DateUtils.YYYY_MM_DD);return format.format(date);}// 自定义方法用于解析日期字符串default LocalDate parseLocalDate(String dateString) {if (dateString == null) {return null;}DateTimeFormatter formatter = DateTimeFormatter.ofPattern(DateUtils.YYYY_MM_DD);try {LocalDateTime dateTime = LocalDateTime.parse(dateString, formatter);return dateTime.toLocalDate();} catch (Exception e) {return null;}}// 自定义方法用于解析日期字符串default LocalDateTime parseLocalDateTime(String dateStr) {if (StringUtils.isBlank(dateStr)) {return null;}try {DateTimeFormatter formatter = DateTimeFormatter.ofPattern(DateUtils.YYYY_MM_DD_HH_MM_SS);return LocalDateTime.parse(dateStr, formatter);} catch (Exception e) {return null;}}
}

package com.mdgyl.hussar.basic.supplier.changeorder.converter.service;import com.google.common.collect.Lists;
import com.jxdinfo.hussar.support.audit.plugin.mongodb.support.query.entity.Page;
import com.mdgyl.common.helper.CollectionHelper;
import com.mdgyl.common.helper.MapHelper;
import com.mdgyl.hussar.basic.enums.SupplierChangeOrderStatusEnum;
import com.mdgyl.hussar.basic.enums.SupplierStatusEnum;
import com.mdgyl.hussar.basic.model.supplier.masterdata.SupplierAddressModel;
import com.mdgyl.hussar.basic.model.supplier.masterdata.SupplierBankModel;
import com.mdgyl.hussar.basic.model.supplier.masterdata.SupplierContactsModel;
import com.mdgyl.hussar.basic.model.supplier.masterdata.SupplierModel;
import com.mdgyl.hussar.basic.model.supplier.supplierchangeorder.*;
import com.mdgyl.hussar.basic.supplier.changeorder.converter.struct.ChangeOrderMapperConverter;
import com.mdgyl.hussar.basic.supplier.changeorder.domain.*;
import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.lang3.ObjectUtils;import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;public class ChangeOrderServiceConverter {public static SupplierChangeOrderModel converterModel(SupplierChangeOrderDo supplierChangeOrderDo) {if (supplierChangeOrderDo == null) {return null;}SupplierChangeOrderModel supplierChangeOrderModel = ChangeOrderMapperConverter.INSTANCE.doToModel(supplierChangeOrderDo);supplierChangeOrderModel.setStatus(SupplierChangeOrderStatusEnum.getDescByCode(supplierChangeOrderDo.getStatus()));return supplierChangeOrderModel;}public static Page<SupplierChangeOrderModel> converterModelPage(Page<SupplierChangeOrderDo> supplierChangeOrderDos) {if (supplierChangeOrderDos == null) {return new Page<SupplierChangeOrderModel>(); // 如果输入是 null，返回一个空的 Page}// 转换数据列表List<SupplierChangeOrderModel> modelList = supplierChangeOrderDos.getRecords().stream().map(ChangeOrderServiceConverter::converterModel).collect(Collectors.toList());// 创建并返回新的 Page<SupplierChangeOrderModel> 对象Page<SupplierChangeOrderModel> page = new Page<>(supplierChangeOrderDos.getCurrent(), supplierChangeOrderDos.getSize(), supplierChangeOrderDos.getTotal());page.setRecords(modelList);return page;}public static SupplierChangeOrderModel converterSupplierToChangeOrderModel(SupplierModel supplierModel) {if (supplierModel == null) {return null;}SupplierChangeOrderModel supplierChangeOrderModel = ChangeOrderMapperConverter.INSTANCE.converterSupplierToChangeOrder(supplierModel);SupplierStatusEnum supplierStatus = supplierModel.getStatus();supplierChangeOrderModel.setAddresses(CollectionHelper.collectNotNullList(supplierModel.getAddresses(), ChangeOrderMapperConverter.INSTANCE::convertAddressesModel));supplierChangeOrderModel.setBanks(CollectionHelper.collectNotNullList(supplierModel.getBanks(), ChangeOrderMapperConverter.INSTANCE::convertBankModel));supplierChangeOrderModel.setContacts(CollectionHelper.collectNotNullList(supplierModel.getContacts(), ChangeOrderMapperConverter.INSTANCE::convertContactModel));SupplierChangeOrderInfoModel supplierChangeOrderInfoModel = ChangeOrderMapperConverter.INSTANCE.convertOderInfoModel(supplierModel.getSupplierInfo());if (ObjectUtils.isEmpty(supplierChangeOrderInfoModel)) {supplierChangeOrderInfoModel=new SupplierChangeOrderInfoModel();supplierChangeOrderInfoModel.setSupplierDataId(supplierModel.getId());}supplierChangeOrderInfoModel.setSupplierStatus(supplierStatus);supplierChangeOrderModel.setChangeOrderInfo(supplierChangeOrderInfoModel);return supplierChangeOrderModel;}public static SupplierChangeOrderModel converterToChangeOrderModel(SupplierChangeOrderDo supplierChangeOrder, SupplierChangeOrderInfo changeOrderInfoDo, List<SupplierChangeOrderAddress> addresses, List<SupplierChangeOrderBank> banks, List<SupplierChangeOrderContacts> contacts) {if (supplierChangeOrder == null) {return null;}SupplierChangeOrderModel supplierChangeOrderModel = ChangeOrderMapperConverter.INSTANCE.doToModel(supplierChangeOrder);supplierChangeOrderModel.setAddresses(CollectionHelper.collectNotNullList(addresses, ChangeOrderMapperConverter.INSTANCE::convertAddressesDoToModel));supplierChangeOrderModel.setBanks(CollectionHelper.collectNotNullList(banks, ChangeOrderMapperConverter.INSTANCE::convertBankDoToModel));supplierChangeOrderModel.setContacts(CollectionHelper.collectNotNullList(contacts, ChangeOrderMapperConverter.INSTANCE::convertContactsDoToModel));supplierChangeOrderModel.setChangeOrderInfo(ChangeOrderMapperConverter.INSTANCE.converterInfoDoToModel(changeOrderInfoDo));return supplierChangeOrderModel;}public static SupplierChangeOrderDo converterModelToDo(SupplierChangeOrderModel supplierChangeOrderModel) {if (supplierChangeOrderModel == null) {return null;}return ChangeOrderMapperConverter.INSTANCE.converterModelToDo(supplierChangeOrderModel);}public static SupplierChangeOrderInfo converterInfoModelToDo(SupplierChangeOrderInfoModel supplierChangeOrderInfoModel) {if (supplierChangeOrderInfoModel == null) {return null;}return ChangeOrderMapperConverter.INSTANCE.converterInfoModelToDo(supplierChangeOrderInfoModel);}public static List<SupplierChangeOrderAddress> converterAddressModelToDoList(List<SupplierChangeOrderAddressModel> supplierChangeOrderAddressList) {if (CollectionUtils.isEmpty(supplierChangeOrderAddressList)) {return Lists.newArrayList();}return supplierChangeOrderAddressList.stream().map(ChangeOrderMapperConverter.INSTANCE::converterAddressModelToDo).collect(Collectors.toList());}public static List<SupplierChangeOrderBank> converterBankModelToDoList(List<SupplierChangeOrderBankModel> supplierChangeOrderBankList) {if (CollectionUtils.isEmpty(supplierChangeOrderBankList)) {return Lists.newArrayList();}return supplierChangeOrderBankList.stream().map(ChangeOrderMapperConverter.INSTANCE::converterBankModelToDo).collect(Collectors.toList());}public static List<SupplierChangeOrderContacts> converterContactsModelToDoList(List<SupplierChangeOrderContactsModel> supplierChangeOrderContactList) {if (CollectionUtils.isEmpty(supplierChangeOrderContactList)) {return Lists.newArrayList();}return supplierChangeOrderContactList.stream().map(ChangeOrderMapperConverter.INSTANCE::converterContactsModel).collect(Collectors.toList());}public static List<SupplierChangeOrderAddressModel> converterChangeOrderAddressList(List<SupplierChangeOrderAddress> addressesList) {if (CollectionUtils.isEmpty(addressesList)) {return Lists.newArrayList();}return addressesList.stream().map(ChangeOrderMapperConverter.INSTANCE::convertAddressesDoToModel).collect(Collectors.toList());}public static List<SupplierChangeOrderAddressModel> converterAddressList(List<SupplierAddressModel> addressesList) {if (CollectionUtils.isEmpty(addressesList)) {return Lists.newArrayList();}return addressesList.stream().map(ChangeOrderMapperConverter.INSTANCE::convertAddressesModel).collect(Collectors.toList());}public static List<SupplierChangeOrderBankModel> converterBankList(List<SupplierBankModel> bankList) {if (CollectionUtils.isEmpty(bankList)) {return Lists.newArrayList();}return bankList.stream().map(ChangeOrderMapperConverter.INSTANCE::convertBankModel).collect(Collectors.toList());}public static List<SupplierChangeOrderContactsModel> converterContactsList(List<SupplierContactsModel> bankList) {if (CollectionUtils.isEmpty(bankList)) {return Lists.newArrayList();}return bankList.stream().map(ChangeOrderMapperConverter.INSTANCE::convertContactModel).collect(Collectors.toList());}public static SupplierChangeOrderInfoModel converterInfoModel(SupplierChangeOrderInfo supplierInfo) {if (supplierInfo == null) {return null;}return ChangeOrderMapperConverter.INSTANCE.converterInfoDoToModel(supplierInfo);}public static List<SupplierChangeOrderContactsModel> converterChangeOrdeContactsList(List<SupplierChangeOrderContacts> contactList) {if (CollectionUtils.isEmpty(contactList)) {return Lists.newArrayList();}return contactList.stream().map(ChangeOrderMapperConverter.INSTANCE::convertContactsDoToModel).collect(Collectors.toList());}public static List<SupplierChangeOrderBankModel> converterChangeOrdeBankList(List<SupplierChangeOrderBank> banks) {if (CollectionUtils.isEmpty(banks)) {return Lists.newArrayList();}return banks.stream().map(ChangeOrderMapperConverter.INSTANCE::convertBankDoToModel).collect(Collectors.toList());}public static List<Long> getAddressDeleteIds(List<SupplierChangeOrderAddressModel> supplierAddressModels, Map<Long, SupplierChangeOrderAddressModel> addressUpdateMap) {// 对比出删除的现场考察数据return CollectionHelper.collectNotNullList(supplierAddressModels, param -> {Long addressId = param.getId();SupplierChangeOrderAddressModel supplierChangeOrderAddressModel = MapHelper.getValue(addressUpdateMap, addressId);if (supplierChangeOrderAddressModel == null) {return addressId;}return null;});}public static List<Long> getBankDeleteIds(List<SupplierChangeOrderBankModel> supplierBankModels, Map<Long, SupplierChangeOrderBankModel> bankUpdateMap) {// 对比出删除的样品检测数据return CollectionHelper.collectNotNullList(supplierBankModels, param -> {Long bankId = param.getId();SupplierChangeOrderBankModel supplierChangeOrderBankModel = MapHelper.getValue(bankUpdateMap, bankId);if (supplierChangeOrderBankModel == null) {return bankId;}return null;});}public static List<Long> getContactsDeleteIds(List<SupplierChangeOrderContactsModel> supplierContactsModels, Map<Long, SupplierChangeOrderContactsModel> contactUpdateMap) {// 对比出删除的资质审查数据return CollectionHelper.collectNotNullList(supplierContactsModels, param -> {Long contactsId = param.getId();SupplierChangeOrderContactsModel supplierChangeOrderContactsModel = MapHelper.getValue(contactUpdateMap, contactsId);if (supplierChangeOrderContactsModel == null) {return contactsId;}return null;});}public static SupplierModel converterChangeOrderToSupplierModel(SupplierChangeOrderModel changeOrderModel) {if (changeOrderModel == null) {return null;}SupplierModel supplierModel = ChangeOrderMapperConverter.INSTANCE.converterChangeOrderToSupplier(changeOrderModel);supplierModel.setStatus(changeOrderModel.getChangeOrderInfo().getSupplierStatus());supplierModel.setAddresses(CollectionHelper.collectNotNullList(changeOrderModel.getAddresses(), ChangeOrderMapperConverter.INSTANCE::convertAddressesToSupplierModel));supplierModel.setBanks(CollectionHelper.collectNotNullList(changeOrderModel.getBanks(), ChangeOrderMapperConverter.INSTANCE::convertBankToSupplierModel));supplierModel.setContacts(CollectionHelper.collectNotNullList(changeOrderModel.getContacts(), ChangeOrderMapperConverter.INSTANCE::convertContactToSupplierModel));supplierModel.setSupplierInfo(ChangeOrderMapperConverter.INSTANCE.convertOderInfoToSupplierModel(changeOrderModel.getChangeOrderInfo()));return supplierModel;}
}