mapstruct的spring拓展

阿超

发布于 2022-08-21 13:36:37

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发布于 2022-08-21 13:36:37

文章被收录于专栏：快乐阿超快乐阿超

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://cloud.tencent.com/developer/article/2078333

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！