JsonGenerator 类可以负责 写入JSON数据作为一个流而不是在存储器中构建对象模型。枚举 JsonGenerator.Feature中提供了可以打开/关闭的设置列表,它包含静态方法values() ,该方法返回包含此枚举 类型的常量的数组。
public static enum JsonGenerator.Feature extends Enum<JsonGenerator.Feature>
import java.io.*; import com.fasterxml.jackson.core.*; public class JsonGeneratorSettingsTest { public static void main(String[] args) throws IOException { StringWriter writer = new StringWriter(); JsonFactory jsonFactory = new JsonFactory(); JsonGenerator jsonGenerator = jsonFactory.createGenerator(writer); for(JsonGenerator.Feature feature : JsonGenerator.Feature.values()) { boolean result = jsonGenerator.isEnabled(feature); System.out.println(feature.name() + ":" + result); } jsonGenerator.close(); } }
输出结果
AUTO_CLOSE_TARGET:true AUTO_CLOSE_JSON_CONTENT:true FLUSH_PASSED_TO_STREAM:true QUOTE_FIELD_NAMES:true QUOTE_NON_NUMERIC_NUMBERS:true ESCAPE_NON_ASCII:false WRITE_NUMBERS_AS_STRINGS:false WRITE_BIGDECIMAL_AS_PLAIN:false STRICT_DUPLICATE_DETECTION:false IGNORE_UNKNOWN:false