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摘要：本文介紹MapStructPlus，也就是MapStruct的加強版，使用注解來簡化手寫對象轉換器。 gitee：https:///easii/mapstruct-plus關鍵注解： @AutoMappers({
@AutoMapper(target = UserDto.class),
@AutoMapper(target = UserVO.class)
})
// 或者
@AutoMapper(target = UserDto.class)
// 使用
User user= Converter.convert(UserDto, User.class);
@AutoMapping(target = "目標字段")
@AutoMapping(target = "目標日期字段", dateFormat = "yyyy-MM-dd HH:mm:ss")
@AutoMapping(target = "目標數值字段", numberFormat = "$#.00", defaultValue = "100")
@AutoMapping(target = "目標字段", expression = "java(java.lang.String.join(",", source.getEducationList()))")
//使用
@AutoMapper(target = User.class, uses = StringToListString.class)
//定義
@Component
public interface StringToListString {
default List<String> stringToListString(String str) {
if (str == null) {
return Collections.emptyList();
}
return Arrays.asList(str.split(","));
}
}
<!-- 依賴和插件 -->
<dependencies>
<dependency>
<groupId>io.github.linpeilie</groupId>
<artifactId>mapstruct-plus-spring-boot-starter</artifactId>
<version>1.5.0</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.20</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<version>2.7.18</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<annotationProcessorPaths>
<path>
<groupId>io.github.linpeilie</groupId>
<artifactId>mapstruct-plus-processor</artifactId>
<version>1.5.0</version>
</path>
<!-- Lombok處理器 防止lombok和mapstruct沖突 致使lombok注解失效 -->
<path>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.20</version>
</path>
<!-- 最新正式版是 0.2.0（或 0.1.0），而不是跟隨 Lombok 主版本 -->
<path>
<groupId>org.projectlombok</groupId>
<artifactId>lombok-mapstruct-binding</artifactId>
<version>0.2.0</version>
</path>
</annotationProcessorPaths>
</configuration>
</plugin>
</plugins>
</build>
package org.coffeebeans.entity;
import io.github.linpeilie.annotations.AutoMapper;
import io.github.linpeilie.annotations.AutoMapping;
import lombok.Builder;
import lombok.Data;
import org.coffeebeans.config.StringToListString;
import java.math.BigDecimal;
/**
* <li>ClassName: User </li>
* <li>Author: OakWang </li>
*/
@Data
@Builder
@AutoMapper(target = UserDto.class, uses = StringToListString.class)
public class User {
private Integer id;
@AutoMapping(target = "name")
private String username;
@AutoMapping(target = "age", defaultValue = "100")
private Integer age;
@AutoMapping(target = "familyAddress")
private String address;
@AutoMapping(target = "money", expression = "java(new java.math.BigDecimal(\"3000\"))")
private BigDecimal money;
}
package org.coffeebeans.entity;
import io.github.linpeilie.annotations.AutoMapper;
import lombok.Data;
import java.math.BigDecimal;
/**
* <li>ClassName: UserDto </li>
* <li>Author: OakWang </li>
*/
@Data
@AutoMapper(target = User.class)
public class UserDto {
private Integer id;
private String name;
private Integer age;
private String familyAddress;
private BigDecimal money;
}
package org.coffeebeans;
import org.coffeebeans.entity.User;
import org.coffeebeans.entity.UserDto;
import org.junit.jupiter.api.Test;
import io.github.linpeilie.Converter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
/**
* <li>ClassName: MapstructTest </li>
* <li>Author: OakWang </li>
*/
@SpringBootTest
public class MapstructPlusTest {
@Autowired
private Converter converter;
@Test
public void test() {
// 創建一個User對象
List<User> userList = new ArrayList<>();
User user = User.builder().id(1).age(null).username("姓名1").address("地址1").money(null).build();
userList.add(user);
// 使用UserTransform將User對象轉換為UserDto對象
UserDto userDto = converter.convert(user, UserDto.class);
List<UserDto> userDtos = converter.convert(userList, UserDto.class);
// 驗證轉換結果
System.out.println("id屬性是否相等：" + Objects.equals(user.getId(), userDto.getId()));
System.out.println("name屬性是否相等：" + Objects.equals(user.getUsername(), userDto.getName()));
System.out.println("age屬性是否相等：" + Objects.equals(user.getAge(), userDto.getAge()));
System.out.println("address屬性是否相等：" + Objects.equals(user.getAddress(), userDto.getFamilyAddress()));
System.out.println("money屬性是否相等：" + Objects.equals(user.getMoney(), userDto.getMoney()));
System.out.println("User對象：" + user);
System.out.println("UserDto對象：" + userDto);
System.out.println("User集合：" + userList);
System.out.println("UserDto集合：" + userDtos);
/*
輸出：
id屬性是否相等：true
name屬性是否相等：true
age屬性是否相等：false
address屬性是否相等：true
money屬性是否相等：false
User對象：User(id=1, username=姓名1, age=null, address=地址1, money=null)
UserDto對象：UserDto(id=1, name=姓名1, age=100, familyAddress=地址1, money=3000)
User集合：[User(id=1, username=姓名1, age=null, address=地址1, money=null)]
UserDto集合：[UserDto(id=1, name=姓名1, age=100, familyAddress=地址1, money=3000)]
*/
}
}
總結：以上我們了解了MapStruct的加強版MapStructPlus，通過注解可以更加便捷映射對象，省去了手寫轉換類的步驟，用起來！
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