解析Orika的MapperFacade 属性赋值的使用问题

<dependency>
            <groupId>ma.glasnost.orika</groupId>
            <artifactId>orika-core</artifactId>
            <version>1.4.2</version><!-- or latest version -->
  	 	</dependency>

package com.lmh.config;

import ma.glasnost.orika.MapperFactory;
import ma.glasnost.orika.impl.DefaultMapperFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * @author lmh
 * @Description:
 * @date 2021/12/21 14:01
 */
@Configuration
public class MapperFactoryAutowire {

    @Bean
    public MapperFactory getMapperFactory(){
        return new DefaultMapperFactory.Builder().build();
    }
}

package com.lmh.po;
import java.util.Date;
/**
 * @author lmh
 * @Description:
 * @date 2021/12/21 14:07
 */
public class Person {
    public Person() {
    }
    public Person(String name, Integer age, Date dateTime) {
        this.name = name;
        this.age = age;
        this.dateTime = dateTime;
    }
    private String name;
    private Integer age;
    private Date dateTime;
    public String getName() {
        return name;
    }
    public Person setName(String name) {
        this.name = name;
        return this;
    }
    public Integer getAge() {
        return age;
    }
    public Person setAge(Integer age) {
        this.age = age;
        return this;
    }
    public Date getDateTime() {
        return dateTime;
    }
    public Person setDateTime(Date dateTime) {
        this.dateTime = dateTime;
        return this;
    }
    @Override
    public String toString() {
        return "Person{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", dateTime=" + dateTime +
                '}';
    }
}

package com.lmh.po;
import java.util.Date;
/**
 * @author lmh
 * @Description:
 * @date 2021/12/21 14:08
 */
public class Student {
    private String name;
    private String grade;
    private Integer age;
    private Date birth;
    public Date getBirth() {
        return birth;
    }
    public Student setBirth(Date birth) {
        this.birth = birth;
        return this;
    }
    public String getName() {
        return name;
    }
    public Student setName(String name) {
        this.name = name;
        return this;
    }
    public String getGrade() {
        return grade;
    }
    public Student setGrade(String grade) {
        this.grade = grade;
        return this;
    }
    public Integer getAge() {
        return age;
    }
    public Student setAge(Integer age) {
        this.age = age;
        return this;
    }
    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", grade='" + grade + '\'' +
                ", age=" + age +
                ", birth=" + birth +
                '}';
    }
}

/**
 * @author lmh
 * @Description:
 * @date 2021/12/21 14:12
 */
@RestController
public class BeanCopyController {
    @Autowired
    public MapperFactory mapperFactory;
    /**
     * @Decription 测试MapperFactory是否生成
     * @Param   null
     * @Return  void
     * @Author  lmh
     * @Date    2021/12/21 14:14
     */
    @RequestMapping("/createMapperFactory")
    public String createMapperFactoryTest(){
        System.out.println("注入的mapperFactory是："+mapperFactory);
        return "注入的mapperFactory是:"+mapperFactory;
    }
    /**
     * @Decription 将一个已经存在的类的属性映射到另外一个类上（可以不存在），直接返回该类，注意
     * 必须要有默认的构造方法，不然会报错
     * @Param   null
     * @Return  com.lmh.po.Student
     * @Author  lmh
     * @Date    2021/12/21 14:27
     */
    @RequestMapping("/beanCopyToBean")
    public Student beanCopyToBean(){
        Student student = null;
        try {
            Person person = new Person("lmh",21,new SimpleDateFormat("yyyy-MM-dd").parse("2000-04-29"));
            //MapperFactory 映射两个对象之间的属性、注册转换器、自定义映射器等等
            mapperFactory.classMap(Person.class,Student.class)
                    .field("dateTime","birth")  //不同属性名的映射
                    .byDefault()    //剩余字段（相同属性名）的映射
                    .register();    //向MapperFactory注册映射关系
            //如果所有的字段都一样，就不用写mapperFactory.classMap()方法；
            student = mapperFactory.getMapperFacade().map(person, Student.class);
            System.out.println("属性赋值之后student的属性："+student);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return student;
    }

/**
     * @Decription  将一个list映射到另一个list中
     * @Param   null
     * @Return  java.util.List<com.lmh.po.Student>
     * @Author  lmh
     * @Date    2021/12/21 15:13
     */
    @RequestMapping("/beanCopyToList")
    public List<Student> beanCopyToList(){
        List<Person> personList = this.getPersonList();
        //手动配置不一样属性转换
        mapperFactory.classMap(Person.class,Student.class)
                .field("dateTime","birth")  //不一样字段的映射
                .byDefault()    //剩余字段的映射
                .register();	//想MapperFacade注册映射关系
        //转换list
        List<Student> studentList = mapperFactory.getMapperFacade().mapAsList(personList, Student.class);
        studentList.forEach(student -> {
            System.out.println(student);
        });
        return studentList;
    }
    /**
     * @Decription 生成personList
     * @Param   null
     * @Return  java.util.List<com.lmh.po.Person>
     * @Author  lmh
     * @Date    2021/12/21 15:20
     */
    public List<Person> getPersonList(){
        List<Person> list = new ArrayList<>(5);
        Person person1 = new Person("lmh1", 20, new Date());
        Person person2 = new Person("lmh2", 22, new Date());
        Person person3 = new Person("lmh3", 30, new Date());
        Person person4 = new Person("lmh4", 14, new Date());
        Person person5 = new Person("lmh5", 15, new Date());
        list.add(person1);
        list.add(person2);
        list.add(person3);
        list.add(person4);
        list.add(person5);
        return list;
    }