记一次高并发情况下安全使用simpledateformat时间类

 private static ThreadLocal<SimpleDateFormat> threadLocal = new ThreadLocal<SimpleDateFormat>(){
        @Override
        protected SimpleDateFormat initialValue() {
            return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        }
    };


    public static void main(String[] args) {
        String format = threadLocal.get().format(new Date());
        System.out.println("format = " + format);     //2023-03-15 15:09:22
    }