思路是项目启动的时候分配给每台机器的IP一个机器码，这样可以避免分布式集群环境并发订单号重复
基本都可以使用了，拿去即用，也可以根据自己的规则生成机器码，后面代码代码基本可以不用动
package org.com.rsmall.admin.init;
import org.apache.commons.lang3.StringUtils;
import org.com.rsmall.core.config.redis.RedisConstants;
import org.com.rsmall.core.config.redis.RedisUtils;
import org.com.utils.IPUtils;
import org.com.utils.IdUtils;
import org.com.utils.log.Log4jKit;
import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;
import java.util.Set;
/**
* @ClassName MachineIdRunner
* @Author yupanpan
* @Date 2021/1/12 15:38
*/
@Component
public class MachineIdRunner implements CommandLineRunner {
@Override
public void run(String... args) throws Exception {
createMachineId();
}
private void createMachineId() {
try {
String ip = IPUtils.getIpV4();
if(StringUtils.isNotBlank(ip)){
Log4jKit.info("本机IP: {}",ip);
Object o = RedisUtils.get(RedisConstants.getMachineIdKey(ip));
if(o!=null){
Integer machineId=Integer.valueOf(o.toString());
IdUtils.machineId=machineId;
}else {
Integer machineId=0;
Set<String> keys = RedisUtils.keys(RedisConstants.PREFIX_MACHINE_ID+"*");
for (String key : keys) {
Object o1 = RedisUtils.get(key);
Integer mId = Integer.valueOf(o1.toString());
if(mId>=machineId){
machineId=mId;
}
if(machineId==0){
machineId=1;
}
}
if(machineId>=31){
machineId=0;
}
if(machineId!=0){
++machineId;
}
IdUtils.machineId=machineId;
RedisUtils.set(RedisConstants.getMachineIdKey(ip),machineId);
}
Log4jKit.info("ip: {},初始化机器码: {}",ip,IdUtils.machineId);
}else {
IdUtils.machineId=0;
}
}catch (Exception e){
Log4jKit.error("初始化机器码失败",e);
IdUtils.machineId=0;
}
}
}
package org.com.rsmall.core.config.redis;
/**
* @ClassName RedisConstants
* @Author yupanpan
* @Date 2021/1/13 17:40
*/
public class RedisConstants {
//机器码key前缀
public static final String PREFIX_MACHINE_ID="MACHINE_ID";
private static final String PREFIX_SELECT_PRODUCT="SELECT_PRODUCT";
private static final String PREFIX_SUBMIT="SUBMIT";
private static final String PREFIX_AGAIN_SUBMIT="AGAIN_SUBMIT";
public static String getSelectProductKey(String value){
return PREFIX_SELECT_PRODUCT+":"+value;
}
public static String getSubmitKey(String value){
return PREFIX_SUBMIT+":"+value;
}
public static String getAgainSubmitKey(String value){
return PREFIX_AGAIN_SUBMIT+":"+value;
}
public static String getMachineIdKey(String value){
return PREFIX_MACHINE_ID+":"+value;
}
}
package org.com.utils;
import org.com.utils.log.Log4jKit;
import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;
/**
* @ClassName IPUtils
* @Author yupanpan
* @Date 2021/1/12 16:00
*/
public class IPUtils {
/**
* 获取本机ip IPV6地址 fe80:0:0:0:216:3eff:fe34:bc09%eth0
* @return
*/
public static InetAddress getInetAddressIPV6() {
try {
for (Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces(); interfaces.hasMoreElements();) {
NetworkInterface networkInterface = interfaces.nextElement();
if (networkInterface.isLoopback() || networkInterface.isVirtual() || !networkInterface.isUp()) {
continue;
}
Enumeration<InetAddress> addresses = networkInterface.getInetAddresses();
if (addresses.hasMoreElements()) {
return addresses.nextElement();
}
}
} catch (SocketException e) {
Log4jKit.error("Error when getting host ip address: <{}>.", e.getMessage());
}
return null;
}
/**
* 获取本机ip IPV4地址 101.201.77.63
* @return
*/
private static InetAddress getInetAddressIPV4() {
try {
Enumeration<NetworkInterface> allNetInterfaces = NetworkInterface.getNetworkInterfaces();
while (allNetInterfaces.hasMoreElements()) {
NetworkInterface netInterface = allNetInterfaces.nextElement();
Enumeration<InetAddress> addresses = netInterface.getInetAddresses();
while (addresses.hasMoreElements()) {
InetAddress address = addresses.nextElement();
if (address != null
&& address instanceof Inet4Address
&& !address.isLoopbackAddress() //loopback地址即本机地址，IPv4的loopback范围是127.0.0.0 ~ 127.255.255.255
&& address.getHostAddress().indexOf(":") == -1) {
return address;
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public static String getIpV4(){
InetAddress address = getInetAddressIPV4();
return address!=null?address.getHostAddress():"127.0.0.0";
}
public static String getIpV6(){
InetAddress address = getInetAddressIPV6();
return address.getHostAddress();
}
}
package org.com.utils;
import org.apache.ibatis.logging.LogException;
import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.util.Date;
import java.util.Enumeration;
import java.util.Random;
import java.util.UUID;
public class IdUtils {
/**
* (目前最多支持32台机器。如需更多，分配动态数据中心，可支持32*32台机器)
*/
//机器码范围只能是0-31 最多支持32台机器
public static Integer machineId;
//数据中心范围只能是0-31 最多支持32台机器，写死为0
public static Integer datacenterId=0;
private static String createMachineNumberUUId() {
int machineId = 1;//最大支持1-9个集群机器部署
int hashCodeV = UUID.randomUUID().toString().hashCode();
if (hashCodeV < 0) {//有可能是负数
hashCodeV = -hashCodeV;
}
// 0 代表前面补充0
// 4 代表长度为4
// d 代表参数为正数型
return machineId + String.format("%015d", hashCodeV).replace("0", "");
}
public static Long getId() {
return IdGenerator.getId();
}
public static Long getSerialNo() {
// Long machineNumberUUId = Long.valueOf(createMachineNumberUUId());
// Long machineId = machineNumberUUId % 32;
SnowFlake snowFlake = new SnowFlake(datacenterId, machineId);
return snowFlake.nextId();
}
/**
* 生成quantity个digits位数随机码
*
* @param quantity 多少个
* @param digits 多少位数
*/
public static String[] randomCode(int quantity, int digits) {
if (digits <= 0 || quantity <= 0) {
throw new LogException("quantity or digits cannot be less than or equal to 0");
}
int bound = 10;
for (int i = 1; i < digits; i++) {
bound = bound * 10;
}
if (quantity > bound) {
throw new LogException("random over limit");
}
String format = "%0digitsd".replace("digits", digits + "");
Random myRandom = new Random();
String[] result = new String[quantity];
int[] luckNums = new int[quantity];
//生成quantity个不同的随机数
for (int i = 0; i < quantity; i++) {
int randomNum = myRandom.nextInt(bound);
while (existed(randomNum, luckNums, i)) {
randomNum = myRandom.nextInt(bound);
}
luckNums[i] = randomNum;
String randomCode = String.format(format, randomNum);
result[i] = randomCode;
}
return result;
}
/**
* 检验新生成的随机数是否已经存在
*
* @param num 新产生的随机数
* @param luckNums 当前随机数数组
* @param index 当前随机数的索引
* @return boolean 是否存在，存在则返回true，不存在则返回false
*/
public static boolean existed(int num, int[] luckNums, int index) {
boolean contains = (num + "").contains("4");//去除带4随机码
if (contains) {
return true;
}
for (int i = 0; i < index; i++) {
if (num == luckNums[i]) {
return true;
}
//这个地方还可以增加一些处理，用来筛选不想要的随机码
}
return false;
}
/**
public static void main(String[] args) throws Exception {
getQuantityOrderNo(10000);
}
*/
//生成20位订单编号 snowFlake算法+2位随机码
public static synchronized String getOrderSerialNo() {
String orderSerialNo = getSerialNo() + randomCode(1, 2)[0];
return orderSerialNo;
}
//生成20位订单编号 年月日时分+2位机器码(确定订单号是在哪台机器(IP)生成)+当前毫秒后5位+1位随机码
//（年月日时分+当前毫秒后5位确定唯一,即使同分钟,毫秒一样，秒一定是不一样的。如秒和毫秒一样,分钟一定是不一样的）
public static synchronized String getOrderNo() throws Exception {
//处理同一毫秒下可能产生重复订单号情况(微秒、纳秒、皮秒、飞秒等)
Thread.sleep(1);
Date date = new Date();
String time = date.getTime() + "";
String digits5 = time.substring(time.length() - 5);
String yyyyMMddHHmm = DateUtils.minuteFormat(new Date());
String orderSerialNo = yyyyMMddHHmm + String.format("%02d", machineId) + digits5 + randomCode(1, 1)[0];
return orderSerialNo;
}
//生成quantity个20位订单编号
public static synchronized String[] getQuantityOrderSerialNo(int quantity) {
String[] orderSerialNos = new String[quantity];
String[] randomCode = randomCode(quantity, 2);
for (int i = 0; i < randomCode.length; i++) {
orderSerialNos[i] = getOrderSerialNo() + randomCode[i];
}
return orderSerialNos;
}
//生成quantity个20位订单编号
public static synchronized String[] getQuantityOrderNo(int quantity) throws Exception {
String[] orderSerialNos = new String[quantity];
for (int i = 0; i < quantity; i++) {
String orderNo = getOrderNo();
orderSerialNos[i] = orderNo;
}
return orderSerialNos;
}
/**
public static void main(String[] args) {
Long machineNumberUUId=Long.valueOf(createMachineNumberUUId());
Long machineId=machineNumberUUId%32;
SnowFlake snowFlake=new SnowFlake(0L,machineId);
return snowFlake.nextId();
}
*/
}
package org.com.utils;
/**
* @ClassName SnowFlake
* @Author yupanpan
* @Date 2020/11/10 17:24
*/
public class SnowFlake {
/**
* 起始的时间戳
*/
private final static long START_STMP = 1480166465631L;
/**
* 每一部分占用的位数
*/
private final static long SEQUENCE_BIT = 12; //序列号占用的位数
private final static long MACHINE_BIT = 5; //机器标识占用的位数
private final static long DATACENTER_BIT = 5;//数据中心占用的位数
/**
* 每一部分的最大值
*/
private final static long MAX_DATACENTER_NUM = -1L ^ (-1L << DATACENTER_BIT);
private final static long MAX_MACHINE_NUM = -1L ^ (-1L << MACHINE_BIT);
private final static long MAX_SEQUENCE = -1L ^ (-1L << SEQUENCE_BIT);
/**
* 每一部分向左的位移
*/
private final static long MACHINE_LEFT = SEQUENCE_BIT;
private final static long DATACENTER_LEFT = SEQUENCE_BIT + MACHINE_BIT;
private final static long TIMESTMP_LEFT = DATACENTER_LEFT + DATACENTER_BIT;
private long datacenterId; //数据中心
private long machineId; //机器标识
private long sequence = 0L; //序列号
private long lastStmp = -1L;//上一次时间戳
public SnowFlake(long datacenterId, long machineId) {
if (datacenterId > MAX_DATACENTER_NUM || datacenterId < 0) {
throw new IllegalArgumentException("datacenterId can't be greater than MAX_DATACENTER_NUM or less than 0");
}
if (machineId > MAX_MACHINE_NUM || machineId < 0) {
throw new IllegalArgumentException("machineId can't be greater than MAX_MACHINE_NUM or less than 0");
}
this.datacenterId = datacenterId;
this.machineId = machineId;
}
/**
* 产生下一个ID
*
* @return
*/
public synchronized long nextId() {
long currStmp = getNewstmp();
if (currStmp < lastStmp) {
throw new RuntimeException("Clock moved backwards. Refusing to generate id");
}
if (currStmp == lastStmp) {
//相同毫秒内，序列号自增
sequence = (sequence + 1) & MAX_SEQUENCE;
//同一毫秒的序列数已经达到最大
if (sequence == 0L) {
currStmp = getNextMill();
}
} else {
//不同毫秒内，序列号置为0
sequence = 0L;
}
lastStmp = currStmp;
return (currStmp - START_STMP) << TIMESTMP_LEFT //时间戳部分
| datacenterId << DATACENTER_LEFT //数据中心部分
| machineId << MACHINE_LEFT //机器标识部分
| sequence; //序列号部分
}
private long getNextMill() {
long mill = getNewstmp();
while (mill <= lastStmp) {
mill = getNewstmp();
}
return mill;
}
private long getNewstmp() {
return System.currentTimeMillis();
}
/**
public static void main(String[] args) {
SnowFlake snowFlake = new SnowFlake(0, 0);
for (int i = 0; i < (1 << 12); i++) {
System.out.println(snowFlake.nextId());
}
}
*/
}
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