[jackson] I want to receive JSON values "0" and "1" as boolean

{
    "name": "Sample item",
    "required": "1"
}

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import lombok.Getter;
import lombok.Setter;

@Getter
@Setter
@JsonIgnoreProperties(ignoreUnknown = true)
public class SampleItem {

  private String name;

  @JsonDeserialize(using=NumericBooleanDeserializer.class) //Deserializer class created below
  private boolean required;  //This can be boolean. If there is no corresponding value in JSON, it will be FALSE.
}

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;

import java.io.IOException;

/**
 *Settings for JSON string conversion (Boolean).
 * - 0 → false
 * - 1 → true
 */
public static class NumericBooleanDeserializer extends JsonDeserializer<Boolean> {
  @Override
  public Boolean deserialize(JsonParser parser, DeserializationContext context) throws IOException {
    return !"0".equals(parser.getText());
  }
}

Recommended Posts