java代码薄：递增序列

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.concurrent.atomic.AtomicInteger;
/**
 * 生成递增序列号-线程安全
 * @java version 8
 * @author cosmozhu
 * @mail zhuchao1103@gmail.com
 * @site https://www.cosmozhu.fun
 */
public class GenSequence {
	private final static AtomicInteger ai = new AtomicInteger(0);
	/**
	 * 生成格式为yyyyMMddHHmmssxxxxx数字型序列号
	 * @param scale 1-10之间的整数
	 * @return 序列号
	 */
	public static String getSeq(int scale) {
		if (scale < 0 || scale > 10) {
			throw new IllegalArgumentException("scale应为[1-10]之间的整数。");
		}
		
		LocalDateTime now = LocalDateTime.now();
		StringBuilder dateTime = new StringBuilder(now.format(DateTimeFormatter.ofPattern("yyyyMMddHHmmss")));
		ai.compareAndSet(Integer.MAX_VALUE, 0);
		int incrementAndGet = ai.incrementAndGet();
		StringBuilder str = new StringBuilder(String.format("%0"+scale+"d", incrementAndGet));      
		return dateTime.append(str.substring(str.length()-scale, str.length())).toString();
	}
	
	public static void main(String[] args) {
		for(int i=0;i<4;i++) {
			System.out.println(GenSequence.getSeq(1));
		}
	}
}