Java SimpleObjectIdResolver-class And Method Code Example
I apologize, but the SimpleObjectIdResolver is not a class from the Apache Commons IO library. It is a part of the Jackson JSON library, which is a separate library for handling JSON data.
SimpleObjectIdResolver class is a part of the Jackson databind package and it provides a simple implementation of ObjectIdResolver that can be used for deserializing JSON data with object references.
Here is an example of how to use the SimpleObjectIdResolver with Jackson JSON library:
import com.fasterxml.jackson.annotation.JsonIdentityInfo;
import com.fasterxml.jackson.annotation.JsonIdentityReference;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.annotation.ObjectIdGenerators;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
public class Example {
@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "type")
@JsonDeserialize(as = AnimalImpl.class)
@JsonSerialize(as = AnimalImpl.class)
public interface Animal {
String getName();
}
@JsonIdentityInfo(generator = ObjectIdGenerators.IntSequenceGenerator.class, property = "@id")
public static class AnimalImpl implements Animal {
private String name;
private int age;
// getters and setters
}
public static class Zoo {
@JsonIdentityReference(alwaysAsId = true)
private Animal animal;
// getters and setters
}
public static void main(String[] args) throws Exception {
String json = "{\"animal\":{\"type\":\"Animal\",\"@id\":1,\"name\":\"Lion\",\"age\":5}}";
ObjectMapper mapper = new ObjectMapper();
mapper.setObjectIdResolver(new SimpleObjectIdResolver());
Zoo zoo = mapper.readValue(json, Zoo.class);
System.out.println("Animal : " + zoo.getAnimal().getName());
}
}
In this example, Animal is a interface and AnimalImpl is an implementation of the interface.