package com.ezubo.global.util; import java.text.SimpleDateFormat; import java.util.Date; import java.util.concurrent.atomic.AtomicLong; /** * 利用原子类生成序列号 不适合分布式场景 * Created by on 2015-12-29. */ public class Generators2 { private static AtomicLong no = new AtomicLong(1L); private static final String DATE_FORMAT = "yyyyMMddHHmmss"; private static final SimpleDateFormat SIMPLE_DATE_FORMAT = new SimpleDateFormat(DATE_FORMAT); private static String forwardTime = ""; private Generators2(){ super(); } /** * 生成序列号 * @param prefix * @return */ public static String getSeqNo(String prefix){ String pfix = prefix == null ? "" : prefix; String currentTime = SIMPLE_DATE_FORMAT.format(new Date()); if(!currentTime.equals(forwardTime)){ no = new AtomicLong(1L); } String serializeNo = FormatUtil.leftpad(no.getAndIncrement(),"00000000"); synchronized (Generators.class){ forwardTime = currentTime; } return pfix + currentTime + serializeNo; } }
利用原子类生成唯一序列号
猜你喜欢
转载自yuhaiwei-bj.iteye.com/blog/2267477
今日推荐
周排行