83 lines
2.5 KiB
Java
83 lines
2.5 KiB
Java
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package com.greenorange.promotion.utils;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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import java.util.concurrent.atomic.AtomicInteger;
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import java.util.concurrent.locks.Lock;
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import java.util.concurrent.locks.ReentrantLock;
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public class OrderNumberUtils {
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// 定义日期格式化器，精确到秒
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private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("yyyyMMddHHmmss");
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// 定义序列号最大值
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private static final int MAX_SEQUENCE = 999999;
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// 当前日期，初始化为当天
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private static String currentDate = getCurrentDate();
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// 自增序列号，线程安全
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private static final AtomicInteger sequence = new AtomicInteger(0);
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// 锁对象，用于保护自增序列号的生成
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private static final Lock lock = new ReentrantLock();
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public static String generateOrderId() {
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// 获取当前日期
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String today = getCurrentDate();
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// 如果日期发生变化，重置序列号
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if (!today.equals(currentDate)) {
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currentDate = today;
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sequence.set(0); // 重置序列号
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}
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// 获取时间戳（精确到秒）
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String timestamp = DATE_FORMAT.format(new Date());
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// 获取4位随机数
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String randomNumber = generateRandomNumber();
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// 获取6位自增序列号，并确保不超过最大值
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int seq = getNextSequence();
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// 格式化序列号为6位
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String formattedSequence = String.format("%06d", seq);
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// 拼接生成订单号
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return timestamp + randomNumber + formattedSequence;
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}
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// 获取当前日期（格式：yyyyMMdd）
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private static String getCurrentDate() {
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return new SimpleDateFormat("yyyyMMdd").format(new Date());
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}
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// 生成4位随机数（范围：0000到9999）
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private static String generateRandomNumber() {
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int random = (int) (Math.random() * 10000); // 生成0到9999之间的随机数
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return String.format("%04d", random); // 格式化为4位
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}
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// 获取下一个自增序列号，使用ReentrantLock来确保线程安全
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private static int getNextSequence() {
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lock.lock(); // 获取锁
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try {
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int seq = sequence.incrementAndGet();
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if (seq > MAX_SEQUENCE) {
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sequence.set(0); // 达到最大值后重置
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seq = sequence.incrementAndGet();
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}
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return seq;
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} finally {
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lock.unlock(); // 确保在最终释放锁
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}
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}
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}
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