Mapstruct 简明教程
MapStruct - Mapping Nested Bean
MapStruct 处理嵌套映射似乎很无缝。例如,一个有主题作为嵌套 Bean 的学生。
现在创建一个可以映射嵌套对象的映射器接口。
@Mapper
public interface StudentMapper {
@Mapping(target="className", source="classVal")
@Mapping(target="subject", source="subject.name")
Student getModelFromEntity(StudentEntity studentEntity);
@Mapping(target="classVal", source="className")
@Mapping(target="subject.name", source="subject")
StudentEntity getEntityFromModel(Student student);
}
Example
在Eclipse中打开在 Mapping Multiple Objects 章节中更新的项目映射。
使用以下代码创建 SubjectEntity.java −
SubjectEntity.java
package com.tutorialspoint.entity;
public class SubjectEntity {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
使用以下代码更新 StudentEntity.java −
StudentEntity.java
package com.tutorialspoint.entity;
public class StudentEntity {
private int id;
private String name;
private String classVal;
private SubjectEntity subject;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getClassVal() {
return classVal;
}
public void setClassVal(String classVal) {
this.classVal = classVal;
}
public SubjectEntity getSubject() {
return subject;
}
public void setSubject(SubjectEntity subject) {
this.subject = subject;
}
}
使用以下代码更新 Student.java −
Student.java
package com.tutorialspoint.model;
public class Student {
private int id;
private String name;
private String className;
private String subject;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getClassName() {
return className;
}
public void setClassName(String className) {
this.className = className;
}
public String getSubject() {
return subject;
}
public void setSubject(String subject) {
this.subject = subject;
}
}
使用以下代码更新 StudentMapper.java −
StudentMapper.java
package com.tutorialspoint.mapper;
import org.mapstruct.Mapper;
import org.mapstruct.Mapping;
import com.tutorialspoint.entity.StudentEntity;
import com.tutorialspoint.model.Student;
@Mapper
public interface StudentMapper {
@Mapping(target="className", source="classVal")
@Mapping(target="subject", source="subject.name")
Student getModelFromEntity(StudentEntity studentEntity);
@Mapping(target="classVal", source="className")
@Mapping(target="subject.name", source="subject")
StudentEntity getEntityFromModel(Student student);
}
使用以下代码更新 StudentMapperTest.java −
StudentMapperTest.java
package com.tutorialspoint.mapping;
import static org.junit.jupiter.api.Assertions.assertEquals;
import org.junit.jupiter.api.Test;
import org.mapstruct.factory.Mappers;
import com.tutorialspoint.entity.StudentEntity;
import com.tutorialspoint.entity.SubjectEntity;
import com.tutorialspoint.mapper.StudentMapper;
import com.tutorialspoint.model.Student;
public class StudentMapperTest {
private StudentMapper studentMapper = Mappers.getMapper(StudentMapper.class);
@Test
public void testEntityToModel() {
StudentEntity entity = new StudentEntity();
entity.setClassVal("X");
entity.setName("John");
entity.setId(1);
SubjectEntity subject = new SubjectEntity();
subject.setName("Computer");
entity.setSubject(subject);
Student model = studentMapper.getModelFromEntity(entity);
assertEquals(entity.getClassVal(), model.getClassName());
assertEquals(entity.getName(), model.getName());
assertEquals(entity.getId(), model.getId());
assertEquals(entity.getSubject().getName(), model.getSubject());
}
@Test
public void testModelToEntity() {
Student model = new Student();
model.setId(1);
model.setName("John");
model.setClassName("X");
model.setSubject("Science");
StudentEntity entity = studentMapper.getEntityFromModel(model);
assertEquals(entity.getClassVal(), model.getClassName());
assertEquals(entity.getName(), model.getName());
assertEquals(entity.getId(), model.getId());
assertEquals(entity.getSubject().getName(), model.getSubject());
}
}
运行以下命令以测试映射。
mvn clean test
Output
命令成功后。验证输出。
mvn clean test
[INFO] Scanning for projects...
...
[INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ mapping ---
[INFO] Surefire report directory: \mvn\mapping\target\surefire-reports
-------------------------------------------------------
T E S T S
-------------------------------------------------------
Running com.tutorialspoint.mapping.DeliveryAddressMapperTest
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.005 sec
Running com.tutorialspoint.mapping.StudentMapperTest
Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.002 sec
Results :
Tests run: 3, Failures: 0, Errors: 0, Skipped: 0
...