How to convert two Java entity classes to each other?

2 years ago
Liam
2 minutes

In Java, the following methods can be used to achieve mutual conversion between two entity classes:

  1. Manually convert: Create a new entity class object, and then set the property values of the new entity class object using the property values of the source entity class object.
public class EntityA {
    private int id;
    private String name;
    
    // getters and setters
}

public class EntityB {
    private int id;
    private String name;
    
    // getters and setters
}

// 将EntityA转换为EntityB
public EntityB convertToEntityB(EntityA entityA) {
    EntityB entityB = new EntityB();
    entityB.setId(entityA.getId());
    entityB.setName(entityA.getName());
    return entityB;
}

// 将EntityB转换为EntityA
public EntityA convertToEntityA(EntityB entityB) {
    EntityA entityA = new EntityA();
    entityA.setId(entityB.getId());
    entityA.setName(entityB.getName());
    return entityA;
}
  1. Utilizing a third-party library, such as ModelMapper, can automatically convert property values between two entity classes.
// 添加ModelMapper依赖库
<dependency>
    <groupId>org.modelmapper</groupId>
    <artifactId>modelmapper</artifactId>
    <version>2.3.8</version>
</dependency>

// 使用ModelMapper进行转换
import org.modelmapper.ModelMapper;

public class EntityA {
    private int id;
    private String name;
    
    // getters and setters
}

public class EntityB {
    private int id;
    private String name;
    
    // getters and setters
}

// 将EntityA转换为EntityB
public EntityB convertToEntityB(EntityA entityA) {
    ModelMapper modelMapper = new ModelMapper();
    EntityB entityB = modelMapper.map(entityA, EntityB.class);
    return entityB;
}

// 将EntityB转换为EntityA
public EntityA convertToEntityA(EntityB entityB) {
    ModelMapper modelMapper = new ModelMapper();
    EntityA entityA = modelMapper.map(entityB, EntityA.class);
    return entityA;
}

One of the two methods mentioned above can be chosen based on specific needs to achieve mutual conversion between entity classes.

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