Jackson Annotations 简明教程

import java.io.IOException;
import java.text.ParseException;

import com.fasterxml.jackson.annotation.JsonEnumDefaultValue;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;

public class JacksonTester {
   public static void main(String args[]) throws ParseException{
      ObjectMapper mapper = new ObjectMapper();
      mapper.enable(DeserializationFeature.READ_UNKNOWN_ENUM_VALUES_USING_DEFAULT_VALUE);
      String jsonString = "\"abc\"";
      try {
         LETTERS value = mapper.readValue(jsonString, LETTERS.class);
         System.out.println(value);
      }
      catch (IOException e) {
         e.printStackTrace();
      }
   }
}
enum LETTERS {
   A, B, @JsonEnumDefaultValue UNKNOWN
}

UNKNOWN