// 主启动类
@EnableDiscoveryClient

// 编写接口
@FeignClient("catmall-coupon") # 微服务名
public interface CouponFeign {
    @GetMapping("/coupon/coupon/member/list")
    R memberList();
}

// 主启动类
@EnableFeignClients(basePackages = "edu.dlut.catmall.member.feign")

// Controller 动态刷新
@RefreshScope

@Data
@TableName("pms_category")
public class CategoryEntity implements Serializable {
	private static final long serialVersionUID = 1L;

	/**
	 * 分类id
	 */
	@TableId
	private Long catId;
	/**
	 * 分类名称
	 */
	private String name;
	/**
	 * 父分类id
	 */
	private Long parentCid;
	/**
	 * 层级
	 */
	private Integer catLevel;
	/**
	 * 是否显示[0-不显示，1显示]
	 */
	private Integer showStatus;
	/**
	 * 排序
	 */
	private Integer sort;
	/**
	 * 图标地址
	 */
	private String icon;
	/**
	 * 计量单位
	 */
	private String productUnit;
	/**
	 * 商品数量
	 */
	private Integer productCount;

	@TableField(exist = false)
	private List<CategoryEntity> children;

}

public List<CategoryEntity> listWithTree() {
    // 这个类继承了 ServiceImpl
    // 1. 查出所有分类列表
    List<CategoryEntity> entities = baseMapper.selectList(null); // 传入 null 代表查询所有

    // 2. 组装成树形结构
    List<CategoryEntity> levelMenu = entities.stream()
        .filter(categoryEntity -> categoryEntity.getParentCid() == 0)
        .map(menu -> {
            menu.setChildren(getChildren(menu, entities));
            return menu;
        }).sorted((m1, m2) -> m1.getSort() == null ? 0 : m1.getSort() - (m2.getSort() == null ? 0 : m2.getSort())).collect(Collectors.toList());
    return levelMenu;
}

/**
     * 递归查找所有菜单的子菜单
     *
     * @param root
     * @param all
     * @return
     */
private List<CategoryEntity> getChildren(CategoryEntity root, List<CategoryEntity> all) {
    List<CategoryEntity> children = all.stream()
        .filter(categoryEntity -> categoryEntity.getParentCid() == root.getCatId())
        .map(categoryEntity -> {
            categoryEntity.setChildren(getChildren(categoryEntity, all));
            return categoryEntity;
        })
        .sorted((m1, m2) -> m1.getSort() == null ? 0 : m1.getSort() - (m2.getSort() == null ? 0 : m2.getSort()))
        .collect(Collectors.toList());
    return children;
}

@Configuration
public class CORSConfig {

    @Bean
    public CorsWebFilter corsWebFilter() {
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        CorsConfiguration corsConfiguration = new CorsConfiguration();

        corsConfiguration.addAllowedHeader("*");
        corsConfiguration.addAllowedMethod("*");
        corsConfiguration.addAllowedOrigin("*");
        corsConfiguration.setAllowCredentials(true);

        source.registerCorsConfiguration("/**", corsConfiguration);
        return new CorsWebFilter(source);
    }

}

@Documented
@Constraint(validatedBy = { ListValueConstraintValidator.class})
@Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER, TYPE_USE })
@Retention(RUNTIME)
public @interface ListValue {

    String message() default "{edu.dlut.common.valid.ListValue.message}";

    Class<?>[] groups() default { };

    Class<? extends Payload>[] payload() default { };

    int[] value() default { };

}

public class ListValueConstraintValidator implements ConstraintValidator<ListValue,Integer> {

    private Set<Integer> set = new HashSet<>();
    //初始化方法
    @Override
    public void initialize(ListValue constraintAnnotation) {
        int[] value = constraintAnnotation.value();
        for (int val : value) {
            set.add(val);
        }
    }

    /**
     *
     * @param value 需要校验的值
     * @param context
     * @return
     */
    @Override
    public boolean isValid(Integer value, ConstraintValidatorContext context) {
        return set.contains(value);
    }
}

@ListValue(value = {0, 1}, groups = {AddGroup.class, UpdateStatusGroup.class})