The attribute @JsonSerialize#as can be used to serialize the annotated declared type to the supertype.
Assuming A extends B:
@Serialize(as = B.class)
A a;
During serializing Jackson will skip the properties of class A and will only serialize the properties of class B.
Example
Java Objects
public class Rectangle {
private int width;
private int height;
.............
}
public class RoundRectangle extends Rectangle {
private int arcWidth;
.............
}
package com.logicbig.example;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
public class View {
@JsonSerialize(as = Rectangle.class)
private RoundRectangle roundRectangle;
.............
}
Main class
public class ExampleMain {
public static void main(String[] args) throws IOException {
System.out.println("-- Java object to JSON (serialization) --");
View view = new View();
view.setRoundRectangle(RoundRectangle.of(5, 7, 2));
System.out.println("Java object: " + view);
ObjectMapper om = new ObjectMapper();
String jsonString = om.writeValueAsString(view);//the arcWith property will be skipped
System.out.println("JSON string: " + jsonString);
System.out.println("-- JSON to Java object (deserialization) --");
View view2 = om.readValue(jsonString, View.class);
System.out.println("Java Object: " + view2);
}
} -- Java object to JSON (serialization) -- Java object: View{roundRectangle=RoundRectangle{arcWidth=2, width=5, height=7}} JSON string: {"roundRectangle":{"width":5,"height":7}} -- JSON to Java object (deserialization) -- Java Object: View{roundRectangle=RoundRectangle{arcWidth=0, width=5, height=7}}
Example ProjectDependencies and Technologies Used: - jackson-databind 2.9.5: General data-binding functionality for Jackson: works on core streaming API.
- JDK 10
- Maven 3.3.9
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