在带有RestController的SpringBoot应用程序中使用Mapstruct和lombok将域类映射为DTO类

问题描述

下面是我的主要应用程序类。

@SpringBootApplication
@EnableAutoConfiguration
@ComponentScan("com.example.demo")
public class Demo1Application {

    public static void main(String[] args) {
        SpringApplication.run(Demo1Application.class,args);
    }

}

控制器类。

@RestController
public class JobAppController {
    
    @Autowired
    JobApplicationRepository jobApplicationRepository;
    
    //@Autowired
    //private JobApplicationMapper mapper;
    
    JobApplicationMapper mapper = Mappers.getMapper(JobApplicationMapper.class);
    
    @GetMapping("/hello")
    public String greeting()
    {
        return "hello Mr";
    }
    
    @PostMapping("/save")
    public JobApplicationDto save(@RequestBody JobApplicationDto jobApplicationDto)
    {
        JobApplication jobApplication = mapper.toEntity(jobApplicationDto);
        jobApplication = jobApplicationRepository.save(jobApplication);
        return mapper.ToDTO(jobApplication);
        
    }

}

映射器界面。

@Mapper
@Component
public interface JobApplicationMapper {

    //JobApplicationMapper mapper = Mappers.getMapper(JobApplicationMapper.class);
    //({ @Mapping(target="employeeId",source="entity.id"),@Mapping(target="employeeName",source="entity.name")})
    
    JobApplicationDto  ToDTO(JobApplication jobApplication);
    JobApplication toEntity(JobApplicationDto jobApplicationDto);
}

我的pom文件。

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.jobSearch</groupId>
    <artifactId>demo-1</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo-1</name>
    <description>Demo project for Spring Boot/JobSearch</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
    <!-- https://mvnrepository.com/artifact/org.mapstruct/mapstruct -->
        <dependency>
    <groupId>org.mapstruct</groupId>
    <artifactId>mapstruct-jdk8</artifactId>
    <version>1.3.0.Final</version>
       </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>MysqL</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
     <groupId>org.apache.commons</groupId>
     <artifactId>commons-lang3</artifactId>
     <version>3.3.2</version>
     <type>jar</type>
</dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.5.1</version>
    <configuration>
        <source>1.8</source>
        <target>1.8</target>
        <annotationProcessorPaths>
            <path>
                <groupId>org.mapstruct</groupId>
                <artifactId>mapstruct-processor</artifactId>
                <version>1.3.0.Beta2</version>
            </path>
        </annotationProcessorPaths>
    </configuration>
</plugin>
        </plugins>
    </build>

</project>

域类。

    @Entity
    @Table(name = "Job_Application")
    //@Data
    //@AllArgsConstructor
    //@NoArgsConstructor
    public class JobApplication {
        
        
        
        @GeneratedValue(strategy = GenerationType.IDENTITY)
        @Id()
        private Integer id;
    
        @Column(name = "requisition_id")
        private String requisition_id;
    
        @Column(name = "job_posting_source")
        private String job_posting_source;
    
        @Column(name = "applied_date")
        private Date applied_date;
    
        @Column(name = "company")
        private String company;
    
        @Column(name = "current_status")
        private String current_status;
    
        @Column(name = "position")
        private String position;
    
        @Column(name = "location")
        private String location;
//getters and setters follows...

dto类。

    /*@Data
    @AllArgsConstructor
    @NoArgsConstructor
    @Builder*/
    public class JobApplicationDto {
        
        private Integer id;
        private String requisition_id;
        private String job_posting_source;
        private Date applied_date;
        private String company;
        private String current_status;
        private String position;
        private String location;
//getters and setters follows

当尝试通过邮递员将数据/ dto（作为JSON）发布到我的数据库表中时，数据将作为空值插入

{
  "requisition_id" : "1234","job_posting_source" : "indeed","applied_date" : "2020-08-15","company" : "softInc","current_status" : "under review","position" : "SE3","location" : "Himalayas"
}

插入后的响应就像这样

{
    "id": null,"requisition_id": null,"job_posting_source": null,"applied_date": null,"company": null,"current_status": null,"position": null,"location": null
}

没有错误消息。不知道我在想什么。 经过彻底调试后，我意识到映射器实现没有问题。但是，由于我在域和dto类中使用了“ lombok”，因此没有生成getter和setter。因此，我现在将它们手动添加到代码中，并可以按预期工作。

PS：我会以此为初学者，所以欢迎任何讨论/建议。

我现在要编辑问题，因为问题在于龙目岛（lombok）为何没有生成吸气剂/阻气剂。

解决方法

我想Lombok缺少标注处理器。

尝试：

<annotationProcessorPaths>
    <path>
        <groupId>org.mapstruct</groupId>
        <artifactId>mapstruct-processor</artifactId>
        <version>${org.mapstruct.version}</version>
    </path>
    <path>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>${org.projectlombok.version}</version>
    </path>
</annotationProcessorPaths>

检出this以获取有效示例。

请注意：Lombok / MapStruct有几个问题。两者都是注释处理器。 Lombok生成吸气剂/吸气剂，MapStruct使用它们。时间至关重要。因此，MapStruct引入了SPI来表示何时准备就绪。