MapStruct 使用生成器

MapStruct 允许使用构建器。 我们可以使用构建器框架，也可以使用我们的自定义构建器。 在下面的示例中，我们使用的是自定义构建器。

示例

打开映射直接字段章节中更新的项目映射。

使用以下代码更新 Student.java

Student.java

package com.jiyik.model;

public class Student {
    private final String name;
    private final int id;

    protected Student(Student.Builder builder) {
        this.name = builder.name;
        this.id = builder.id;
    }
    public static Student.Builder builder() {
        return new Student.Builder();
    }
    public static class Builder {
        private String name;
        private int id;
        public Builder name(String name) {
            this.name = name;
            return this;
        }
        public Builder id(int id) {
            this.id = id;
            return this;
        }
        public Student create() {
            return new Student( this );
        }
    }
    public String getName() {
        return name;
    }
    public int getId() {
        return id;
    }
}

使用以下代码更新 StudentMapper.java

StudentMapper.java

package com.jiyik.mapper;

import com.jiyik.entity.StudentEntity;
import com.jiyik.model.Student;
import org.mapstruct.Mapper;
import org.mapstruct.Mapping;

@Mapper
public interface StudentMapper {
    Student getModelFromEntity(StudentEntity studentEntity);
    @Mapping(target="id", source="id")
    @Mapping(target="name", source="name")
    StudentEntity getEntityFromModel(Student student);
}

使用以下代码更新 StudentMapperTest.java

StudentMapperTest.java

import com.jiyik.entity.StudentEntity;
import com.jiyik.mapper.StudentMapper;
import com.jiyik.model.Student;
import org.junit.Test;
import org.mapstruct.factory.Mappers;

import static org.junit.Assert.assertEquals;

public class StudentMapperTest {
    private StudentMapper studentMapper = Mappers.getMapper(StudentMapper.class);

    @Test
    public void testEntityToModel() {
        StudentEntity entity = new StudentEntity();
        entity.setName("John");
        entity.setId(1);
        Student model = studentMapper.getModelFromEntity(entity);
        assertEquals(entity.getName(), model.getName());
        assertEquals(entity.getId(), model.getId());
    }
    @Test
    public void testModelToEntity() {
        Student.Builder builder = Student.builder().id(1).name("John");
        Student model = builder.create();
        StudentEntity entity = studentMapper.getEntityFromModel(model);
        assertEquals(entity.getName(), model.getName());
        assertEquals(entity.getId(), model.getId());
    }
}

运行以下命令来测试映射。

$ mvn clean test

执行结果如下