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Importance of @JsonView annotation using Jackson in Java?
The JsonView annotation can be used to include/exclude a property during the serialization and deserialization process dynamically. We need to configure an ObjectMapper class to include the type of view used for writing a JSON from Java object using the writerWithView() method.
Syntax
@Target(value={ANNOTATION_TYPE,METHOD,FIELD})
@Retention(value=RUNTIME)
public @interface JsonViewExample
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonView;
import com.fasterxml.jackson.core.JsonProcessingException;
public class JsonViewAnnotationTest {
public static void main(String args[]) throws JsonProcessingException {
ObjectMapper objectMapper = new ObjectMapper();
String jsonString = objectMapper.writerWithView(Views.Public.class).writeValueAsString(new Person());
String jsonStringInternal = objectMapper.writerWithView(Views.Internal.class).writeValueAsString(new Person());
System.out.println(jsonString);
System.out.println(jsonStringInternal);
}
}
// Person class
class Person {
@JsonView(Views.Public.class)
public long personId = 115;
@JsonView(Views.Public.class)
public String personName = "Raja Ramesh";
@JsonView(Views.Internal.class)
public String gender = "male";
@Override
public String toString() {
return "Person{" +
"personId=" + personId +
", personName='" + personName + '\'' +
", gender='" + gender + '\'' +
'}';
}
}
class Views {
static class Public {}
static class Internal extends Public {}
}Output
{"personId":115,"personName":"Raja Ramesh"}
{"personId":115,"personName":"Raja Ramesh","gender":"male"}
Updated on: 08-Jul-2020
1K+ Views
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