json,bean互转工具类(fastjson的体验，达到Jackson的效果)

public class JacksonUtils {

   private static ObjectMapper mapper;

   static {
      mapper = new ObjectMapper();
      mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
      mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
      mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
      mapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
      mapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
   }

   public static String toJSONString(Object obj) {
      return obj != null ? toJSONString(obj, () -> "") : "";
   }

   public static <T> T parseObject(String json, Class<T> clazz) {
      try {
         return mapper.readValue(json, clazz);
      } catch (JsonProcessingException e) {
         e.printStackTrace();
         return null;
      }
   }

   public static <T> List<T> parseArray(String json, Class<T> clazz) {
      try {
         return json == null ? null : mapper.readValue(json, mapper.getTypeFactory().constructParametricType(List.class, clazz));
      } catch (JsonProcessingException e) {
         e.printStackTrace();
         return null;
      }
   }

   public static <T> T parseObject(String json, TypeReference<T> type) {
      try {
         return json == null ? null : mapper.readValue(json, type);
      } catch (JsonProcessingException e) {
         e.printStackTrace();
         return null;
      }
   }

   private static String toJSONString(Object obj, Supplier<String> defaultSupplier) {
      try {
         return obj != null ? mapper.writeValueAsString(obj) : defaultSupplier.get();
      } catch (JsonProcessingException e) {
         return defaultSupplier.get();
      }
   }
}