使用Orika进行JavaBean属性复制

Orika是一个高效的Java Bean属性复制工具，它利用javassist在运行时动态生成字段属性映射的字节码，虽然在性能上略逊于cglib的BeanCopier，但在灵活性和易用性方面表现出色。

GitHub地址：https://github.com/orika-mapper/orika

Maven依赖

要在项目中使用Orika，需要在pom.xml文件中添加以下依赖：

    ma.glasnost.orika
    orika-core
    1.5.4

Java使用示例

为了更好地演示Orika的功能，我们创建了一些测试用例，这些用例展示了Orika的基本用法以及如何处理不同字段名和类型转换的情况。

    org.projectlombok
    lombok
    1.18.22


    org.junit.jupiter
    junit-jupiter
    5.8.1


    com.google.guava
    guava
    29.0-jre

以下是具体的Java代码示例：

package bean;

import com.google.common.collect.Lists;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.experimental.Accessors;
import lombok.experimental.FieldNameConstants;
import ma.glasnost.orika.MapperFacade;
import ma.glasnost.orika.converter.ConverterFactory;
import ma.glasnost.orika.converter.builtin.DateToStringConverter;
import ma.glasnost.orika.impl.DefaultMapperFactory;
import org.junit.jupiter.api.Test;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import static org.junit.jupiter.api.Assertions.*;

/**
 * Orika演示测试类
 */
class OrikaDemoTest {
    @Test
    void testMap() {
        DefaultMapperFactory mapperFactory = getMapperFactory();
        MapperFacade facade = mapperFactory.getMapperFacade();
        SourceClass source = getSourceClass();
        // 基本使用
        TargetClass target = facade.map(source, TargetClass.class);
        compare(source, target);
        assertNotEquals(source.getEmail(), target.getMyEmail());
    }

    @Test
    void testMapAsList() {
        DefaultMapperFactory mapperFactory = getMapperFactory();
        MapperFacade facade = mapperFactory.getMapperFacade();
        SourceClass source = getSourceClass();
        // 集合映射
        List target = facade.mapAsList(Lists.newArrayList(source), TargetClass.class);
        compare(source, target.get(0));
        assertNotEquals(source.getEmail(), target.get(0).getMyEmail());
    }

    @Test
    void testDiffFieldName() {
        DefaultMapperFactory mapperFactory = getMapperFactory();
        // 设置不同字段名双向映射
        mapperFactory.classMap(SourceClass.class, TargetClass.class)
                .field(SourceClass.Fields.email, TargetClass.Fields.myEmail)
                .byDefault()
                .register();
        MapperFacade facade = mapperFactory.getMapperFacade();
        SourceClass source = getSourceClass();
        TargetClass target = facade.map(source, TargetClass.class);
        compare(source, target);
        assertEquals(source.getEmail(), target.getMyEmail());
    }

    @Test
    void testConverter() throws ParseException {
        String format = "yyyy-MM-dd";
        DefaultMapperFactory mapperFactory = getMapperFactory();
        // 设置类型转换
        ConverterFactory cOnverterFactory= mapperFactory.getConverterFactory();
        converterFactory.registerConverter(new DateToStringConverter(format));
        String birth = "2021-11-21";
        Date date = new SimpleDateFormat(format).parse(birth);
        SourceClass source = getSourceClass()
                .setBirth(date);
        MapperFacade facade = mapperFactory.getMapperFacade();
        TargetClass target = facade.map(source, TargetClass.class);
        compare(source, target);
        assertEquals(birth, target.getBirth());
    }

    private DefaultMapperFactory getMapperFactory() {
        return new DefaultMapperFactory.Builder().build();
    }

    private void compare(SourceClass source, TargetClass target) {
        assertEquals(source.getId(), target.getId());
        assertEquals(source.getName(), target.getName());
        assertEquals(source.getAge(), target.getAge());
    }

    private SourceClass getSourceClass() {
        return SourceClass.builder()
                .id(1L)
                .name("test")
                .age(18)
                .email("email@xxx")
                .build();
    }

    @Data
    @Builder
    @NoArgsConstructor
    @AllArgsConstructor
    @FieldNameConstants
    @Accessors(chain = true)
    static class SourceClass {
        private Long id;
        private String name;
        private Integer age;
        private String email;
        private Date birth;
    }

    @Data
    @Builder
    @NoArgsConstructor
    @AllArgsConstructor
    @FieldNameConstants
    static class TargetClass {
        private Long id;
        private String name;
        private int age;
        private String myEmail;
        private String birth;
    }
}