java中使用JacksonMap器注解的反序列化

ars1skjm 于 7个月前发布在 Java

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我正在尝试使用Jackson注解来解释以下json。以下是我的当前代码：

@JsonTypeInfo(
  use = JsonTypeInfo.Id.NAME,
  include = JsonTypeInfo.As.PROPERTY,
  property = "serviceType")
@JsonSubTypes({
    @JsonSubTypes.Type(value = StripeServiceConfiguration.class, name = "Stripe"),
    @JsonSubTypes.Type(value = BrainServiceConfiguration.class, name = "Brain"),
})
public interface ServiceConfiguration {
  TypeOfService getServiceType();
}

StripeService

@Data
    public class StripeServiceConfiguration implements ServiceConfiguration {
      private static final TypeOfService serviceType = TypeOfService.STRIPE;
      private Map<String, Object> jsonConfiguration;

      @Override
      public TypeOfService getServiceType() {
        return serviceType;
      }
    }

支付服务

@Data
    public class BrainServiceConfiguration implements ServiceConfiguration {
      private static final TypeOfService serviceType = TypeOfService.BRAIN;
      private Map<String, Object> jsonConfiguration;

      @Override
      public TypeOfService getServiceType() {
        return serviceType;
      }
    }

JSON请求

{
"serviceConfiguration": {
    "serviceType": "Stripe",
    "jsonConfiguration": {
     .....
     ....
    }}}

Enum类

public enum TypeOfService {
      STRIPE("Stripe"),
      BRAIN("Brain")
    }

获取错误

Caused by: com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot 
construct instance of `com.example.models.payment.ServiceConfiguration` (no Creators, 
like default constructor, exist): abstract types either need to be mapped to concrete 
types, have custom deserializer, or contain additional type information

有什么建议吗？还是我做错了什么

Jackson

来源：https://stackoverflow.com/questions/76913911/deserialization-using-jackson-mapper-annotations-in-java

1条答案

按热度按时间

pzfprimi1#

我可以通过以下更改使其工作：
1.在特定的类中，@NoArgConstructor和@Getter就足够了。这个类看起来像这样：

@NoArgsConstructor
@Getter
public class StripeServiceConfiguration implements ServiceConfiguration {
    private Map<String, Object> jsonConfiguration;
}

1.添加了一个wrapper类：

@Data
public class ConfigWrapper {
    private ServiceConfiguration serviceConfiguration;
}

1.然后，使用 Package 器类进行反序列化，如下所示：

String json = "{\"serviceConfiguration\":{\"serviceType\":\"Stripe\",\"jsonConfiguration\":{\"key1\":\"value1\",\"key2\":\"value2\"}}}";
ConfigWrapper config = new ObjectMapper().readValue(json, ConfigWrapper.class);

TypeOfService getServiceType();可能不需要此方法。所以，我把它清理干净了。界面现在看起来像这样：

@JsonTypeInfo(use = JsonTypeInfo.Id.NAME,
              property = "serviceType")
@JsonSubTypes({
    @JsonSubTypes.Type(value = StripeServiceConfiguration.class, name = "Stripe"),
    @JsonSubTypes.Type(value = BrainServiceConfiguration.class, name = "Brain"),
})
public  interface ServiceConfiguration {
}

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