?场景
前台提交到后台的数据使用一个实体类进行封装,需要将总实体类的数据放到不同的实体类中.一般会在业务层像下面这么写
UserEntity userEntity = new UserEntity();
// 拷贝jtv010Form到userEntity中
BeanUtils.copyProperties(jtv010Form, userEntity);
PersonEntity personEntity = new PersonEntity();
BeanUtils.copyProperties(jtv010Form, personEntity);
能实现功能,但是语义化不好,可读性低
😁语义化较好的书写方法
?前台提交的表单Bean
import org.springframework.beans.BeanUtils;
public class Jtv010Form {
private String id;
private String name;
private String age;
private String address;
private String hobby;
// 省略get和set
// 转换为User实体类
public UserEntity convertToUserEntity(){
Jtv010FormToUserConverter toUserConverter = new Jtv010FormToUserConverter();
return toUserConverter.convert(this);
}
// 转换为Person实体类
public PersonEntity convertToPersonEntity(){
Jtv010FormToPersonConverter toPersonConverter = new Jtv010FormToPersonConverter();
return toPersonConverter.convert(this);
}
// 定义内部类,实现实体类转换接口,通过内部类进行实体类之间的转换
private static class Jtv010FormToUserConverter implements FormConvert<Jtv010Form, UserEntity> {
@Override
public UserEntity convert(Jtv010Form jtv010Form) {
UserEntity userEntity = new UserEntity();
BeanUtils.copyProperties(jtv010Form, userEntity);
return userEntity;
}
}
private static class Jtv010FormToPersonConverter implements FormConvert<Jtv010Form, PersonEntity> {
@Override
public PersonEntity convert(Jtv010Form jtv010Form) {
PersonEntity personEntity = new PersonEntity();
BeanUtils.copyProperties(jtv010Form, personEntity);
return personEntity;
}
}
}
?实体类转换接口
public interface FormConvert<S,T> {
T convert(S s);
}
?待转换的实体类
public class UserEntity {
private String id;
private String name;
private String age;
// 省略get和set
}
public class PersonEntity {
private String id;
private String address;
private String hobby;
// 省略get和set
}
?测试
import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;
@Component
public class Test3 implements CommandLineRunner {
@Override
public void run(String... args) throws Exception {
// 模拟前台提交到后台的数据
Jtv010Form jtv010Form = new Jtv010Form();
jtv010Form.setId("1");
jtv010Form.setName("贾飞天");
jtv010Form.setAge("18");
jtv010Form.setAddress("地球");
jtv010Form.setHobby("喝水");
// 直接进行转换,语义明了,简单易懂提高可读性
UserEntity userEntity = jtv010Form.convertToUserEntity();
System.out.println(userEntity);
// 将实体类转换的代码聚合到需要转换的实体类中
PersonEntity personEntity = jtv010Form.convertToPersonEntity();
System.out.println(personEntity);
}
}
