spring中ReflectionUtils 方法的一些使用

ReflectionUtils.doWithFields 通过反射对对象中属性进行操作
代码举例：

@Component
@Data
@ToString
public class Cart implements InitializingBean {

    public Cart() {
        System.out.println("构造器");
    }

    @FieldMapping("ID")
    private Integer id;

    @FieldMapping("DESC-lq")
    private String desc;

    @PostConstruct
    public void init() {
        System.out.println("init");
    }

    @Override
    public void afterPropertiesSet() throws Exception {
        System.out.println("initializingBean");
    }
}

@Target({ElementType.FIELD, ElementType.ANNOTATION_TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface FieldMapping {

    String value() default "";

    String description() default "";
}

@Test
    public void testReflectionUtil() {
        Map<String, Object> map = new HashMap<>(2);
        map.put("ID", 2);
        map.put("DESC-lq", "desc");
        Cart cart = new Cart();
        ReflectionUtils.doWithFields(cart.getClass(), field ->{
            field.setAccessible(true);
            FieldMapping annotation = field.getAnnotation(FieldMapping.class);
            if (annotation == null) {
                return;
            }
            if (StringUtils.isBlank(annotation.value())) {
                return;
            }
            Object value = map.get(annotation.value());
            field.set(cart, value);
        });
        System.out.println("cart = " + cart);
    }