活着不一定要鲜艳，但一定要有自己的颜色。——张曙光
首先按照惯例放官网：
https://mapstruct.org/documentation/spring-extensions/reference/html/
基本的使用方式之前博客已经写过了我们就不再细表，这里简单放上链接
https://VampireAchao.gitee.io/2022/03/23/mapstruct/
在此之前还要配置对应的依赖和插件
<properties> <java.version>1.8</java.version> <!-- 编译生成代码插件版本号开始(避免mapstruct和lombok冲突，因此此处指定一个兼容的版本) --> <lombok.version>1.18.10</lombok.version> <mapstruct.version>1.3.0.Final</mapstruct.version> <mapstruct.spring.version>0.1.1</mapstruct.spring.version> <!-- 编译生成代码插件版本号结束 --> </properties> <dependencies> <!-- 用到的GAV --> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>${lombok.version}</version> <scope>provided</scope> <optional>true</optional> </dependency> <dependency> <groupId>org.mapstruct</groupId> <artifactId>mapstruct</artifactId> <version>${mapstruct.version}</version> </dependency> <dependency> <groupId>org.mapstruct.extensions.spring</groupId> <artifactId>mapstruct-spring-annotations</artifactId> <version>${mapstruct.spring.version}</version> </dependency> </dependencies> <build> <plugins> <!-- 需要配置的插件 --> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.8.1</version> <configuration> <source>1.8</source> <target>1.8</target> <encoding>UTF-8</encoding> <!-- lombok和mapstruct配置开始 --> <annotationProcessorPaths> <path> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>${lombok.version}</version> </path> <path> <groupId>org.mapstruct</groupId> <artifactId>mapstruct-processor</artifactId> <version>${mapstruct.version}</version> </path> <path> <groupId>org.mapstruct.extensions.spring</groupId> <artifactId>mapstruct-spring-extensions</artifactId> <version>${mapstruct.spring.version}</version> </path> </annotationProcessorPaths> <!-- lombok和mapstruct配置结束 --> </configuration> </plugin> </plugins> </build>
为什么要用？
因为我们之前使用中，需要对每个Mapper定义方法，然后调用对应的方法
如果对于简单的转换，能有一种能统一的规范，那样就不会乱
因此我们使用spring的Convert接口
完整类名为org.springframework.core.convert.converter.Converter
我们写法如下：
package com.ruben.simplescaffold.mapper.mapstruct; import org.mapstruct.Mapper; import org.mapstruct.Mapping; import org.springframework.core.convert.converter.Converter; import com.ruben.simplescaffold.entity.UserDetail; import com.ruben.simplescaffold.pojo.vo.UserVO; /** * 用户mapstruct转换mapper * * @author <achao1441470436@gmail.com> * @since 2022/3/23 19:18 */ @Mapper(componentModel = "spring") public interface MapUserMapper extends Converter<UserDetail, UserVO> { /** * po转vo * * @param userDetail po * @return vo */ @Override @Mapping(source = "username", target = "uname") @Mapping(source = "password", target = "pwd") UserVO convert(UserDetail userDetail); }
然后如果你按照官方文档接着使用：
package com.ruben.simplescaffold; import javax.annotation.Resource; import org.junit.jupiter.api.Assertions; import org.junit.jupiter.api.Test; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.core.convert.ConversionService; import com.ruben.simplescaffold.entity.UserDetail; import com.ruben.simplescaffold.pojo.vo.UserVO; /** * @author <achao1441470436@gmail.com> * @since 2022/3/23 19:22 */ @SpringBootTest class MapUserMapperTest { @Resource private ConversionService conversionService; @Test void convertPoToVoTest() { UserVO userVO = conversionService.convert(UserDetail.builder().username("ruben").password("vampire").build(), UserVO.class); Assertions.assertEquals("ruben", userVO.getUname()); Assertions.assertEquals("vampire", userVO.getPwd()); } }
你会发现踩坑了
报错：
org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type [com.ruben.simplescaffold.entity.UserDetail] to type [com.ruben.simplescaffold.pojo.vo.UserVO]
然后我通过debug发现是没有将转换器添加进ConversionService中
因此我们只要编写一个Config添加进去即可
package com.ruben.simplescaffold.config; import java.util.List; import org.springframework.context.annotation.Configuration; import org.springframework.core.convert.converter.Converter; import org.springframework.core.convert.support.GenericConversionService; /** * 转换配置 * * @author <achao1441470436@gmail.com> * @since 2022/5/1 0:44 */ @Configuration public class ConvertConfig { /** * 注册我们自定义的转换器 * * @param converters 转换器列表 * @param conversionService 转换服务 * @param <T> 转换源泛型 * @param <R> 转换目标泛型 */ public <T, R> ConvertConfig(List<Converter<T, R>> converters, GenericConversionService conversionService) { converters.forEach(conversionService::addConverter); } }
再次使用
成功！
