package publicsWay;
import java.time.Instant;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.time.temporal.ChronoField;

public class EfficientTimeFormatter {

    // ʹÓà ThreadLocal À´´æ´¢Ã¿¸öÏß³ÌµÄ DateTimeFormatter
    private static final ThreadLocal<DateTimeFormatter> formatterThreadLocal = ThreadLocal.withInitial(() -> {
        // ʹÓà DateTimeFormatterBuilder ¹¹½¨Ò»¸ö¸ßЧµÄ¸ñʽ»¯Æ÷
        return new DateTimeFormatterBuilder()
                .appendValue(ChronoField.YEAR, 4)
                .appendLiteral('-')
                .appendValue(ChronoField.MONTH_OF_YEAR, 2)
                .appendLiteral('-')
                .appendValue(ChronoField.DAY_OF_MONTH, 2)
                .appendLiteral(' ')
                .appendValue(ChronoField.HOUR_OF_DAY, 2)
                .appendLiteral(':')
                .appendValue(ChronoField.MINUTE_OF_HOUR, 2)
                .appendLiteral(':')
                .appendValue(ChronoField.SECOND_OF_MINUTE, 2)
                .toFormatter();
    });

    // »ñÈ¡µ±Ç°Ê±¼äµÄ×Ö·û´®±íʾ
    public static String getCurrentTimeFormatted() {
        Instant now = Instant.now(); // »ñÈ¡µ±Ç°Ê±¼ä
        DateTimeFormatter formatter = formatterThreadLocal.get(); // »ñÈ¡µ±Ç°Ï̵߳ĸñʽ»¯Æ÷
        return formatter.format(now.atZone(ZoneId.systemDefault())); // ¸ñʽ»¯Ê±¼ä
    }

   
}