111111111111 01等于多少(11111111-11111111等于多少)

public class SnowflakeIdWorker {// ==============================Fields==================/** 开始时间截 (2019-08-06) */private final long twepoch = 1565020800000L;

/** 机器id所占的位数 */private final long workerIdBits = 5L;

/** 数据标识id所占的位数 */private final long datacenterIdBits = 5L;

/** 支持的最大机器id，结果是31 (这个移位算法可以很快的计算出几位二进制数所能表示的最大十进制数) */private final long maxWorkerId = -1L ^ (-1L << workerIdBits);

/** 支持的最大数据标识id，结果是31 */private final long maxDatacenterId = -1L ^ (-1L << datacenterIdBits);

/** 序列在id中占的位数 */private final long sequenceBits = 12L;

/** 机器ID向左移12位 */private final long workerIdShift = sequenceBits;

/** 数据标识id向左移17位(12+5) */private final long datacenterIdShift = sequenceBits + workerIdBits;

/** 时间截向左移22位(5+5+12) */private final long timestampLeftShift = sequenceBits + workerIdBits + datacenterIdBits;

/** 生成序列的掩码，这里为4095 (0b111111111111=0xfff=4095) */private final long sequenceMask = -1L ^ (-1L << sequenceBits);

/** 工作机器ID(0~31) */private long workerId;

/** 数据中心ID(0~31) */private long datacenterId;

/** 毫秒内序列(0~4095) */private long sequence = 0L;

/** 上次生成ID的时间截 */private long lastTimestamp = -1L;

//==============================Constructors====================/** * 构造函数 * @param workerId 工作ID (0~31) * @param datacenterId 数据中心ID (0~31) */public SnowflakeIdWorker(long workerId, long datacenterId) {if (workerId > maxWorkerId || workerId < 0) {throw new IllegalArgumentException(String.format(\"worker Id can't be greater than %d or less than 0\", maxWorkerId)); }if (datacenterId > maxDatacenterId || datacenterId < 0) {throw new IllegalArgumentException(String.format(\"datacenter Id can't be greater than %d or less than 0\", maxDatacenterId)); }this.workerId = workerId;this.datacenterId = datacenterId; }

// ==============================Methods=================================/** * 获得下一个ID (该方法是线程安全的) * @return SnowflakeId */public synchronized long nextId {long timestamp = timeGen;

//如果当前时间小于上一次ID生成的时间戳，说明系统时钟回退过这个时候应当抛出异常if (timestamp < lastTimestamp) {throw new RuntimeException( String.format(\"Clock moved backwards. Refusing to generate id for %d milliseconds\", lastTimestamp - timestamp)); }

//如果是同一时间生成的，则进行毫秒内序列if (lastTimestamp == timestamp) { sequence = (sequence + 1) & sequenceMask;//毫秒内序列溢出if (sequence == 0) {//阻塞到下一个毫秒,获得新的时间戳 timestamp = tilNextMillis(lastTimestamp); } }//时间戳改变，毫秒内序列重置else { sequence = 0L; }

//上次生成ID的时间截 lastTimestamp = timestamp;

//移位并通过或运算拼到一起组成64位的IDreturn ((timestamp - twepoch) << timestampLeftShift) // | (datacenterId << datacenterIdShift) // | (workerId << workerIdShift) // | sequence; }

/** * 阻塞到下一个毫秒，直到获得新的时间戳 * @param lastTimestamp 上次生成ID的时间截 * @return 当前时间戳 */protected long tilNextMillis(long lastTimestamp) {long timestamp = timeGen;while (timestamp <= lastTimestamp) { timestamp = timeGen; }return timestamp; }

/** * 返回以毫秒为单位的当前时间 * @return 当前时间(毫秒) */protected long timeGen {return System.currentTimeMillis; }

//==============================Test=============================================/** 测试 */public static void main(String[] args) { SnowflakeIdWorker idWorker = new SnowflakeIdWorker(0, 0);for (int i = 0; i < 1000; i++) {long id = idWorker.nextId; System.out.println(Long.toBinaryString(id)); System.out.println(id); } }}

apache.commons.lang3包

<dependency><groupId>org.apache.commons</groupId><artifactId>commons-lang3</artifactId><version>3.6</version></dependency>

读取配置文件：https://blog.csdn.net/fly910905/article/details/78737323

工具类

package com.datalook.util.common;

import org.apache.commons.lang3.time.DateFormatUtils;

import java.util.Date;/** * * @Title: 订单号生成 * @ClassName:OrderIdUtils.java * @Description: * * @Copyright 2016-2017 - Powered By 研发中心 * @author: 王延飞 * @date:2018年3月22日 下午7:43:30 * @version V1.0 */public class OrderIdUtils {

// 最近的时间戳private long lastTimestamp=0;//机器id 2位private final String machineId;// 0，并发控制private long sequence = 0L;// 序列号的最大值private final int sequenceMax = 9999;

public OrderIdUtils(String machineId) {this.machineId = machineId; }

/** * 生成订单号 */public synchronized String nextId{ Date now=new Date; String time= DateFormatUtils.format(now,\"yyMMddHHmmssSSS\");long timestamp = now.getTime;if (this.lastTimestamp == timestamp) {// 如果上一个timestamp与新产生的相等，则sequence加一(0-4095循环);// 对新的timestamp，sequence从0开始this.sequence = this.sequence + 1 % this.sequenceMax;if (this.sequence == 0) {// 重新生成timestamp timestamp = this.tilNextMillis(this.lastTimestamp); } } else {this.sequence = 0; }this.lastTimestamp= timestamp; StringBuilder sb=new StringBuilder(time).append(machineId).append(leftPad(sequence,4));return sb.toString; }

/** * 补码 * @param i * @param n * @return */private String leftPad(long i,int n){ String s = String.valueOf(i); StringBuilder sb=new StringBuilder;int c=n-s.length; c=c<0?0:c;for (int t=0;t<c;t++){ sb.append(\"0\"); }return sb.append(s).toString; }

/** * 等待下一个毫秒的到来, 保证返回的毫秒数在参数lastTimestamp之后 */private long tilNextMillis(long lastTimestamp) {long timestamp = System.currentTimeMillis;while (timestamp <= lastTimestamp) { timestamp = System.currentTimeMillis; }return timestamp; }

// 这里读取的是配置文件// 机器id(我这里是01,正式环境建议使用机器IP)// 注意：分布式环境,注意每台机器的id要保证不同;也可以使用机器ip,映射成一个数字编号（如01:192.168.55.12）private static String myid= SysConstant.LOCAL_MACHINE_ID;

// 示例private static OrderIdUtils instance = new OrderIdUtils(myid);public static OrderIdUtils getInstance {return instance; }

/** * * @Title: 获取订单号 * @return String * @Description: * * @author: 王延飞 * @date: 2018年3月22日 下午7:56:56 */public static String getOrderNumber {

OrderIdUtils orderId = OrderIdUtils.getInstance; String nextId = orderId.nextId;

return nextId; }

/** * 调用 */public static void main(String[] args) { OrderIdUtils orderId= OrderIdUtils.getInstance; String nextId = orderId.nextId;int length = nextId.length; System.out.println(nextId); System.out.println(length);

}}