package cn.emay.sdk.util;
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import java.util.Calendar;
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import java.util.Date;
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/**
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* 唯一序列生成器
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*
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* @author Frank
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*
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*/
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public class OnlyIdGenerator {
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/**
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* 补全字段
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*/
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private static String ZERO10 = "0000000000";
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/**
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* ID 序列
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*/
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private static int ID_INDEX = 0;
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/**
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* ID 序列计算时间
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*/
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private static long ID_END_MILLIS = 0l;
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/**
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* 生成18位的唯一数字ID<br/>
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* 当前毫秒数(13) + 序列(2) + 服务标识(3)<br/>
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* 等待机制：如果当前毫秒数的序列超过100，则等待累加到下一毫秒。即每毫秒最多生成100个smsid
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*
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* @return
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*/
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public synchronized static String genOnlyId(String serverCode) {
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long millis = System.currentTimeMillis();
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if (millis == ID_END_MILLIS) {
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ID_INDEX++;
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} else {
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ID_INDEX = 0;
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ID_END_MILLIS = millis;
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}
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if (ID_INDEX > 99) {
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boolean wait = true;
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while (wait) {
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millis = System.currentTimeMillis();
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if (millis != ID_END_MILLIS) {
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wait = false;
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ID_END_MILLIS = millis;
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ID_INDEX = 0;
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}
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}
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}
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String indexStr = ZERO10 + ID_INDEX;
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indexStr = indexStr.substring(indexStr.length() - 2, indexStr.length());
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String smsId = millis + indexStr + serverCode;
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return smsId;
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}
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/**
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* BID 序列
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*/
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private static int BID_INDEX = 0;
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/**
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* BID 序列计算时间
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*/
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private static String BID_END_MILLIS = "";
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/**
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* 生成唯一BID编码<br/>
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* yyyyMMddHHmmss(14) + 序列(7) + 服务标识(3)<br/>
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*
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*/
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public synchronized static String genOblyBId(String serverCode) {
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String time = DateUtil.toString(new Date(), "yyyyMMddHHmmss");
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if (BID_END_MILLIS.equals(time)) {
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BID_INDEX++;
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} else {
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BID_INDEX = 0;
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BID_END_MILLIS = time;
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}
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String indexStr = ZERO10 + BID_INDEX;
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indexStr = indexStr.substring(indexStr.length() - 7, indexStr.length());
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String no = time + indexStr + serverCode;
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return no;
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}
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public static String paramSmsId(String smsId) {
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Calendar calendar = Calendar.getInstance();
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calendar.setTimeInMillis(Long.parseLong(smsId.substring(0, 13)));
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String name = DateUtil.toString(calendar.getTime(), "yyyyMMdd");
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return name;
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}
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public static void main(String[] args) {
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String genid = genOnlyId("111");
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System.out.println(genid + "\t" + genid.length());
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}
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}
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