采用反制技术实现对象间的赋值

转换工具类

public class ConverterUtil {
    /**
     * 两个对象之间的赋值
     * @param source 原对象
     * @param dest 目标对象
     * @throws IllegalAccessException
     * @throws NoSuchMethodException
     * @throws InvocationTargetException
     */
    public static  void getAttribute(E source, E dest) {
        //处理自身
        final Class clazz = source.getClass();
        for (Field field : clazz.getDeclaredFields()) {
            try {
                fun(field, source, dest);
            } catch (IllegalAccessException | NoSuchMethodException | InvocationTargetException e) {
                e.printStackTrace();
            }
        }
        final Class superclass = source.getClass().getSuperclass();
        //处理父类
        for (Field field : superclass.getDeclaredFields()) {
            //打开私有访问
            try {
                fun(field, source, dest);
            } catch (IllegalAccessException | NoSuchMethodException | InvocationTargetException e) {
                e.printStackTrace();
            }
        }
    }

    private static  void fun(Field field, E source, E dest) throws IllegalAccessException, NoSuchMethodException, InvocationTargetException {
        //打开私有访问
        field.setAccessible(true);
        //获取属性
        String name = field.getName();
        //不处理final类型的字段
        if(!Modifier.isFinal(field.getModifiers())) {
            if (field.get(source) != null) {
                String methodName = "set" + name.substring(0, 1).toUpperCase() + name.substring(1, name.length());
                Method method = source.getClass().getMethod(methodName, field.getType());
                method.invoke(dest, field.get(source));
            }
        }
    }
}

测试 待测试实体类

• 父类

@Getter
@Setter
@ToString
@NoArgsConstructor
@AllArgsConstructor
public class BaseEntity implements Serializable {
    private Long id;
    private Integer state;
    private LocalDateTime createTime;
    private LocalDateTime updateTime;
}

• 子类

@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@ToString(callSuper = true)
public class Province extends BaseEntity {
    private String name;
    private String area;
    private Integer priority;

    @Builder
    public Province(Long id, Integer state, LocalDateTime createTime, LocalDateTime updateTime, String name, String area, Integer priority) {
        super(id, state, createTime, updateTime);
        this.name = name;
        this.area = area;
        this.priority = priority;
    }
}

测试代码

    public static void main(String[] args) {
        final Province source = Province.builder().name("河北省").state(123).build();
        final Province dest = Province.builder().id(1001L).area("华北")
                .name("河北省").updateTime(LocalDateTime.now()).build();
        ConverterUtil.getAttribute(source, dest);
        System.out.println(dest);
    }

结果