common_helper/src/main/java/com/xiongyingqi/jackson/helper/ThreadJacksonMixInHolder.java
public static boolean isContainsMixIn() {
        if (holderThreadLocal.get() == null) {
            return false;
        }
        if (holderThreadLocal.get().mixIns != null && holderThreadLocal.get().mixIns.size() > 0) {
            return true;
        }
        return false;
    }
public static boolean isContainsMixIn() {
        if (holderThreadLocal.get() == null) {
            return false;
        }
        if (holderThreadLocal.get().mixIns != null && holderThreadLocal.get().mixIns.size() > 0) {
            return true;
        }
        return false;
    }
判断当前线程是否存在MixIn集合

@return