Java 带Jackson异常的序列化和反序列化
正如答案所示,当我对容器进行序列化和反序列化时,出现了以下异常:Java 带Jackson异常的序列化和反序列化,java,json,jackson,Java,Json,Jackson,正如答案所示,当我对容器进行序列化和反序列化时,出现了以下异常: Caused by: org.codehaus.jackson.map.JsonMappingException: Can not find a Value deserializer for abstract type [simple type, class com.xiaonei.wap.ps.model.Container] at org.codehaus.jackson.map.deser.StdDeserializerPr
Caused by: org.codehaus.jackson.map.JsonMappingException: Can not find a Value deserializer for abstract type [simple type, class com.xiaonei.wap.ps.model.Container]
at org.codehaus.jackson.map.deser.StdDeserializerProvider._handleUnknownValueDeserializer(StdDeserializerProvider.java:321)
at org.codehaus.jackson.map.deser.StdDeserializerProvider.findValueDeserializer(StdDeserializerProvider.java:116)
at org.codehaus.jackson.map.deser.StdDeserializer.findDeserializer(StdDeserializer.java:260)
at
只需删除或重命名
type
字段的setter/getter即可
public class Container
{
private AAnimal animal;
public AAnimal getAnimal()
{
return animal;
}
@JsonTypeInfo(use=JsonTypeInfo.Id.NAME, include=JsonTypeInfo.As.EXTERNAL_PROPERTY, property="type")
@JsonSubTypes({ @Type(value = Cat.class, name = "cat"), @Type(value = Dog.class, name = "dog") })
public void setAnimal(AAnimal animal)
{
this.animal = animal;
}
}
public abstract class AAnimal
{
public String name;
}
试验
String json = "{\"type\":\"cat\", \"animal\" : {\"name\":\"cat-mew\" }}";
Container val = o.readValue(json, Container.class);
System.out.println(o.writeValueAsString(val));
输出为
{"animal":{"name":"cat-mew"},"type":"cat"}
如果删除类型字段,则会得到以下信息:org.codehaus.jackson.map.exc.UnrecognizedPropertyException:Unrecognized字段“type”(Class com.chat.jsonobject.Message),未标记为可忽略