【org.mapstruct】使用org.mapstruct做bean的映射

 针对编译时碰到空指针问题，需要在idea工具中加入如上配置

-Djps.track.ap.dependencies=false

 

 

 

一、在pom中引入依赖。lombok的依赖，要在mapstruct之前【这个还是比较不靠谱的，或者双方都实现sett,gett方法】

                <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
                        <version>1.18.18</version>
        </dependency>
               <dependency>
            <groupId>org.mapstruct</groupId>
            <artifactId>mapstruct-jdk8</artifactId>
                        <version>1.3.1.Final</version>
        </dependency>
        <dependency>
            <groupId>org.mapstruct</groupId>
            <artifactId>mapstruct-processor</artifactId>
                        <version>1.3.1.Final</version>
        </dependency>
                

二、entity和 PO 的示意

entity

package com.sxq.study.dao.domain;

import lombok.Data;

public class User {
    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column sxq_user.id
     *
     * @mbggenerated Sun Aug 06 18:45:18 CST 2023
     */
    private long id;

    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column sxq_user.user_name
     *
     * @mbggenerated Sun Aug 06 18:45:18 CST 2023
     */
    private String userName;

    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column sxq_user.age
     *
     * @mbggenerated Sun Aug 06 18:45:18 CST 2023
     */
    private Integer age;

    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column sxq_user.address
     *
     * @mbggenerated Sun Aug 06 18:45:18 CST 2023
     */
    private String address;

    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column sxq_user.password
     *
     * @mbggenerated Sun Aug 06 18:45:18 CST 2023
     */
    private String password;

    public long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

po

package com.sxq.study.dao.po;

import lombok.Data;

/**
 * @author: shangxiaofei01@shizhuang-inc.com
 * @description:
 * @date: 2023/8/9 13:58
 */

public class UserDTO {

    private long id;

    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column sxq_user.user_name
     *
     * @mbggenerated Sun Aug 06 18:45:18 CST 2023
     */
    private String userName;

    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column sxq_user.age
     *
     * @mbggenerated Sun Aug 06 18:45:18 CST 2023
     */
    private Integer age;

    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column sxq_user.address
     *
     * @mbggenerated Sun Aug 06 18:45:18 CST 2023
     */
    private String address;

    /**
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column sxq_user.password
     *
     * @mbggenerated Sun Aug 06 18:45:18 CST 2023
     */
    private String password;

    public long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

 

三、Mapper接口定义

package com.sxq.study.dao.po.mapper;


import com.sxq.study.dao.domain.User;
import com.sxq.study.dao.po.UserDTO;
import org.mapstruct.Mapper;

/**
 * @author: shangxiaofei01@shizhuang-inc.com
 * @description:
 * @date: 2023/8/9 13:59
 */
@Mapper()
public interface UserMapper {


    UserDTO entity2UserDTO(User user);
}

 

四、测试

进行代码编译，就会生成如下类 。 路径target/generated-sources/annotations下

package com.sxq.study.dao.po.mapper;

import com.sxq.study.dao.domain.User;
import com.sxq.study.dao.po.UserDTO;
import javax.annotation.Generated;

@Generated(
    value = "org.mapstruct.ap.MappingProcessor",
    date = "2023-08-09T14:48:06+0800",
    comments = "version: 1.3.1.Final, compiler: javac, environment: Java 1.8.0_381 (Oracle Corporation)"
)
public class UserMapperImpl implements UserMapper {

    @Override
    public UserDTO entity2UserDTO(User user) {
        if ( user == null ) {
            return null;
        }

        UserDTO userDTO = new UserDTO();

        userDTO.setId( user.getId() );
        userDTO.setUserName( user.getUserName() );
        userDTO.setAge( user.getAge() );
        userDTO.setAddress( user.getAddress() );
        userDTO.setPassword( user.getPassword() );

        return userDTO;
    }
}