jackson通过特定的键将json反序列化为不同的子类

import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.annotation.JsonSubTypes;
import com.fasterxml.jackson.annotation.JsonTypeName;
import com.fasterxml.jackson.databind.ObjectMapper;

@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, property = "type")
@JsonSubTypes({
    @JsonSubTypes.Type(value = SubClassA.class, name = "subclassA"),
    @JsonSubTypes.Type(value = SubClassB.class, name = "subclassB")
})
public abstract class BaseClass {
    // 父类的属性和方法
}

@JsonTypeName("subclassA")
public class SubClassA extends BaseClass {
    // 子类A的属性和方法
}

@JsonTypeName("subclassB")
public class SubClassB extends BaseClass {
    // 子类B的属性和方法
}

public class Main {
    public static void main(String[] args) throws Exception {
        String json = "{\"type\":\"subclassA\",\"propertyA\":\"valueA\"}";

        ObjectMapper mapper = new ObjectMapper();
        BaseClass obj = mapper.readValue(json, BaseClass.class);

        if (obj instanceof SubClassA) {
            SubClassA subObj = (SubClassA) obj;
            // 处理子类A的逻辑
        } else if (obj instanceof SubClassB) {
            SubClassB subObj = (SubClassB) obj;
            // 处理子类B的逻辑
        }
    }
}