@JsonTypeInfo(
        use = JsonTypeInfo.Id.NAME,
        include = As.PROPERTY,
        property = "type")
@JsonSubTypes({
        @JsonSubTypes.Type(value = Dog.class, name = "dog"),
        @JsonSubTypes.Type(value = Cat.class, name = "cat")
})
public class Animal {
    public String name;
 
    public Animal(String name) {
    }
}
 
@JsonTypeName("dog")
// 這里在子類中指定的type name必須和抽象類中注解@JsonSubTypes中name屬性指定的值保持一致
public class Dog extends Animal {
    public double barkVolume;
 
    public Dog(String name) {
        super(name);
        barkVolume = 0.5;
    }
}
 
@JsonTypeName("cat")
public class Cat extends Animal {
    boolean likesCream;
    public int lives;
 
    public Cat(String name) {
        super(name);
        likesCream = true;
        lives = 10;
    }
}
  
    @Test
    public void whenSerializingPolymorphic_thenCorrect()
            throws JsonProcessingException {
        Zoo.Dog dog = new Zoo.Dog("lacy");
        Zoo zoo = new Zoo(dog);
 
        String result = new ObjectMapper()
                .writeValueAsString(zoo);
 
        assertThat(result, containsString("type"));
        assertThat(result, containsString("dog"));
    }
 
    序列化zoo對象，結果如下:
        {
         "type":"dog",
         "name":"lacy",
         "barkVolume":0
        }
 
    @Test
    public void whenDeserializingPolymorphic_thenCorrect()
            throws IOException {
        String json = "{\"name\":\"lacy\",\"type\":\"cat\"}";
 
        Animal animal =
                new ObjectMapper().readerFor(Animal.class).readValue(json);
 
        assertEquals("lacy", animal.name);
        assertEquals(Cat.class, animal.getClass());
    }

@Data
public class CouponTemplateDto {
    /**
     * 優(yōu)惠券類型id
     */
    private Long couponTypeId;
    /**
     * 優(yōu)惠券模板id
     */
    private Long couponTemplateId;
    /**
     * 用戶id
     */
    private Long userId;

    /**
     * 優(yōu)惠券描述
     */
    private String description;
    /**
     * 面值，滿200減30，則此值為30
     */
    private BigDecimal value;
    /**
     * 從次日起，多少天可用
     */
    private Integer delayDays;
    /**
     * 從當日起，多少天可用
     */
    private Integer nowDays;
    /**
     * 滿多少可以減，滿200減30，則此值為200
     */
    private BigDecimal fullAmount;

    /**
     * 券號
     */
    private String couponNo;

    /**
     * 有效起始日期
     */
    private Date startTime;

    /**
     * 失效日期
     */
    private Date endTime;

    /**
     * 創(chuàng)建時間
     */
    private Date createTime;

    /**
     * 使用日期
     */
    private Date useTime;

    /**
     * 券使用狀態(tài):0-未使用 1-已使用 2-已過期
     */
    private Integer couponUseStatus;
    /**
     * 過期前多少天提醒，默認7天
     */
    private Integer overDueRemind;
    /**
     * 優(yōu)惠券標題
     */
    private String title;

    /**
     * 優(yōu)惠券是否能開始使用
     */
//    @JsonProperty("isStart")
    private Boolean start;
    /**
     * 優(yōu)惠券是否過期
     */
//    @JsonProperty("isEnd")
    private Boolean end;

    private Boolean getStart() {
        return startTime.before(new Date());
    }

    private Boolean getEnd() {
        return endTime.before(new Date());
    }
}