package com.javaweb.common.utils;
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import java.text.*;
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import java.util.Calendar;
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public class TimeUuidUtil {
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/**
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* The FieldPosition.
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*/
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private static final FieldPosition HELPER_POSITION = new FieldPosition(0);
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/**
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* This Format for format the data to special format.
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*/
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private final static Format dateFormat = new SimpleDateFormat("YYMMddHHmmss");
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private final static Format dateFormatS = new SimpleDateFormat("YYMMddHHmmssSSS");
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/**
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* This Format for format the number to special format.
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*/
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private final static NumberFormat numberFormat = new DecimalFormat("0000");
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/**
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* This int is the sequence number ,the default value is 0.
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*/
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private static int seq = 0;
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private static final Object lock = new Object();
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private static final Object lock2 = new Object();
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/**
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* 时间格式生成16位序列ID （注：1秒内最多调用一万次，否则会出现重复）
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* 性能十万次耗时约320ms
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*
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* @return Long
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*/
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public static Long get16UUID() {
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Calendar rightNow = Calendar.getInstance();
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StringBuffer sb = new StringBuffer();
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synchronized(lock){
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return getFormatNum(dateFormat,sb,rightNow);
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}
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}
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/**
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* 时间格式生成19位序列ID （注：1毫秒内最多调用一万次，否则会出现重复）
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* 注：到2092年时该数字会超出long的范围，会抛异常
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* @return Long
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*/
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public static Long get19UUID(){
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Calendar rightNow = Calendar.getInstance();
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StringBuffer sb = new StringBuffer();
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synchronized(lock2){
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return getFormatNum(dateFormatS,sb,rightNow);
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}
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}
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private static Long getFormatNum(Format dateFormat,StringBuffer sb,Calendar rightNow){
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dateFormat.format(rightNow.getTime(), sb, HELPER_POSITION);
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numberFormat.format(seq, sb, HELPER_POSITION);
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if (seq == 9999) {
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seq = 0;
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} else {
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seq++;
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}
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return Long.parseLong(sb.toString());
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}
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}
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