fastjson实现json字段类型处理器

@Slf4j
@MappedTypes({Object.class})
@MappedJdbcTypes(JdbcType.VARCHAR)
public class WeightListTypeHandler  extends AbstractJsonTypeHandler<Object> {
    private static Gson gson = new Gson();
    private final Class<?> type;
    private Boolen flag; 

    public WeightListTypeHandler(Class<?> type) {
        if (log.isTraceEnabled()) {
            log.trace("WeightListTypeHandler(" + type + ")");
        }
        Assert.notNull(type, "Type argument cannot be null");
        this.type = type;
    }

    @Override
    protected Object parse(String json) {
        if(!flag.equals("true")){
	ParserConfig.getGlobalInstance().addAccept("com.serol.pojo");
	flag=true;
        }
        return Json.parseObject(json, type);
    }

    @Override
    protected String toJson(Object obj) {
        return Json.toJsonString(obj,SerializerFeatrue.WriteMapNullValue,...);
    }

}