实体映射类库之ModelMapper

柔光的暖阳◎ 2022-11-11 13:11 199阅读 0赞

<dependency>
        <groupId>org.modelmapper</groupId>
        <artifactId>modelmapper</artifactId>
        <version>2.3.9</version>
    </dependency>

以下为相关的使用示例

<dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.16.18</version>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
    </dependency>

源对象：

import lombok.AllArgsConstructor;
    import lombok.Data;
    import lombok.NoArgsConstructor;
    
    @Data
    @NoArgsConstructor
    @AllArgsConstructor
    public class Apple {
    
        private String id;
        private String name;
        private String createAge;
        private String age;
    }

目标对象：

import lombok.Data;
    
    @Data
    public class AppleDto {
    
        private String name;
        private String create_age;
        private String birth;
    }

import org.junit.Test;
    import org.modelmapper.ModelMapper;
    import org.modelmapper.PropertyMap;
    import org.modelmapper.TypeToken;
    import org.modelmapper.convention.MatchingStrategies;
    
    public class Demo {
    
        public static Apple apple=new Apple("1", "red", "21", "25");;
        ModelMapper modelMapper = new ModelMapper();
    
        @Test
        public void test1(){
            //直接使用modelMapper要求两个对象的属性命名必须完全一致
            AppleDto appleDto = modelMapper.map(apple, AppleDto.class);
            System.out.println(appleDto.toString());
        }
    
        @Test
        public void test2(){
            //修改modelMapper的匹配策略：松散匹配源属性和目标属性
            //将AppleDto字段改成createage也是可以正确赋值
            modelMapper.getConfiguration().setMatchingStrategy(MatchingStrategies.LOOSE);
            AppleDto appleDto = modelMapper.map(apple, AppleDto.class);
            System.out.println(appleDto.toString());
        }
    
        @Test
        public void test3(){
            //modelMapper采用自定义源属性和目标属性映射规则
            modelMapper.addMappings(customField());
            AppleDto appleDto = modelMapper.map(apple, new TypeToken<AppleDto>(){}.getType());
            System.out.println(appleDto);
        }
    
        /**
         * 自定义源（Apple）属性和目标（destination）属性映射规则
         */
        private static PropertyMap customField() {
            return new PropertyMap<Apple, AppleDto>() {
                @Override
                protected void configure() {
                    map(source.getAge(), destination.getBirth());
                }
            };
        }
    }