java怎么将实体类(Entity)与DTO进行转换 实现Entity与DTO对象之间的转换方法

Entity:

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public class UserEntity {

  private Long id;

  private String name;

  private String email;

  // getter 和 setter 省略

}

DTO:

public class UserDTO {

  private Long id;

  private String name;

  private String displayEmail;

  // getter 和 setter 省略

}

转换代码：

UserDTO dto = new UserDTO();

dto.setId(entity.getId());

dto.setName(entity.getName());

dto.setDisplayEmail("邮箱: " + entity.getEmail());

<dependency>

  <groupId>org.mapstruct</groupId>

  <artifactId>mapstruct</artifactId>

  <version>1.5.2.Final</version>

</dependency>

import org.mapstruct.Mapper;

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import org.mapstruct.Mapping;

@Mapper

public interface UserMapper {

  UserMapper INSTANCE = Mappers.getMapper(UserMapper.class);

  @Mapping(source = "email", target = "displayEmail")

  UserDTO toDTO(UserEntity entity);

}

UserDTO dto = UserMapper.INSTANCE.toDTO(userEntity);

<dependency>

  <groupId>org.modelmapper</groupId>

  <artifactId>modelmapper</artifactId>

  <version>3.1.0</version>

</dependency>

ModelMapper mapper = new ModelMapper();

// 自动映射同名字段

UserDTO dto = mapper.map(userEntity, UserDTO.class);

mapper.createTypeMap(UserEntity.class, UserDTO.class)

  .addMapping(src -> src.getEmail(), (dest, v) -> dest.setDisplayEmail("邮箱：" + v));

import org.springframework.beans.BeanUtils;

UserDTO dto = new UserDTO();

BeanUtils.copyProperties(userEntity, dto);