package com.ezubo.global.util; import org.apache.commons.lang3.time.DateFormatUtils; import java.text.SimpleDateFormat; import java.util.Date; /**利用单例模式生成序列号 不适合分布式系统 * Created by on 2015-12-29. */ public class Generators { private static final String DATE_FORMAT = "yyyyMMddHHmmss"; private static final SimpleDateFormat SIMPLE_DATE_FORMAT = new SimpleDateFormat(DATE_FORMAT); private static String forwardTime = ""; private static Long no = 1l; private Generators(){ super(); } /** * 生成序列号 * @param prefix * @return */ public static String getSeqNo(String prefix){ synchronized (Generators.class){ String pfix = prefix == null?"":prefix; String currentTime = SIMPLE_DATE_FORMAT.format(new Date()); if(!currentTime.equals(forwardTime)){ no = 1l; } String serializeNo = FormatUtil.leftpad(no++ , "00000000"); forwardTime = currentTime; return pfix + currentTime + serializeNo; } } }
利用单例模式生成序列号
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转载自yuhaiwei-bj.iteye.com/blog/2267461
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