首页 > 编程语言> > java-杰克逊的@JsonTypeInfo(use = Id.CUSTOM,include = As.PROPERTY,property =“ type”)读取JSON的所有字段(“ type”除外
java-杰克逊的@JsonTypeInfo(use = Id.CUSTOM,include = As.PROPERTY,property =“ type”)读取JSON的所有字段(“ type”除外
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我逐步完成了每一行代码,但是我认为这就是Jackson内部处理多态性的方式.
使用狗和猫扩展动物的经典示例:
@JsonTypeInfo(use = Id.CUSTOM, include = As.PROPERTY, property = "type")
@JsonTypeIdResolver(AnimalTypeIdResolver.class)
@JsonIgnoreProperties(ignoreUnknown = true)
public abstract class Animal implements Serializable {
public AnnotatorBundleConfig(String name) {
super();
this.name = name;
}
狗类:
public class DogAnimal extends Animal {
@JsonCreator
public DogAnimal(
@JsonProperty(value="name", required=true) String name,
@JsonProperty(value="bark_decibel") int bark_decibel)
{
super(name);
this.bark_decibel = bark_decibel;}
猫类:
public class CatAnimal extends Animal {
@JsonCreator
public CatAnimal(
@JsonProperty(value="name", required=true) String name,
@JsonProperty(value="meow_level") int meow_level)
{
super(name);
this.meow_level = meow_level;}
AnimalTypeIdResolver是扩展AbstractTypeIdResolver的典型TypeIdResolver.
出于某些非常奇怪的原因,bark_decibel和meow_level从JSON反序列化,但是type以null形式进入.有任何想法吗?
解决方法:
为@JsonTypeInfo设置visible = true:
@JsonTypeInfo(use = Id.CUSTOM, include = As.PROPERTY, property = "type", visible=true)
标签:jackson2,jackson,json,java 来源: https://codeday.me/bug/20191118/2025829.html