@Component public class OrderJob {@Autowiredprivate OrderService orderService;/*** 使用定時(shí)任務(wù)關(guān)閉超期未支付訂單，會(huì)存在的弊端：* 1. 會(huì)有時(shí)間差，程序不嚴(yán)謹(jǐn)* 10:39下單，11:00檢查不足1小時(shí)，12:00檢查，超過1小時(shí)多余39分鐘* 2. 不支持集群* 單機(jī)沒毛病，使用集群后，就會(huì)有多個(gè)定時(shí)任務(wù)* 解決方案：只使用一臺(tái)計(jì)算機(jī)節(jié)點(diǎn)，單獨(dú)用來運(yùn)行所有的定時(shí)任務(wù)* 3. 會(huì)對(duì)數(shù)據(jù)庫(kù)全表搜索，及其影響數(shù)據(jù)庫(kù)性能：select * from order where orderStatus = 10;* 定時(shí)任務(wù)，僅僅只適用于小型輕量級(jí)項(xiàng)目，傳統(tǒng)項(xiàng)目** 后續(xù)課程會(huì)涉及到消息隊(duì)列：MQ-> RabbitMQ, RocketMQ, Kafka, ZeroMQ...* 延時(shí)任務(wù)（隊(duì)列）* 10:12分下單的，未付款（10）狀態(tài)，11:12分檢查，如果當(dāng)前狀態(tài)還是10，則直接關(guān)閉訂單即可*/// @Scheduled(cron = "0/3 * * * * ?") // @Scheduled(cron = "0 0 0/1 * * ?")public void autoCloseOrder() {orderService.closeOrder();System.out.println("執(zhí)行定時(shí)任務(wù)，當(dāng)前時(shí)間為："+ DateUtil.getCurrentDateString(DateUtil.DATETIME_PATTERN));}} /*** A cron-like expression, extending the usual UN*X definition to include triggers* on the second as well as minute, hour, day of month, month and day of week.* <p>E.g. {@code "0 * * * * MON-FRI"} means once per minute on weekdays* (at the top of the minute - the 0th second).* <p>The special value {@link #CRON_DISABLED "-"} indicates a disabled cron trigger,* primarily meant for externally specified values resolved by a ${...} placeholder.* @return an expression that can be parsed to a cron schedule* @see org.springframework.scheduling.support.CronSequenceGenerator*/ String cron() default ""; @EnableScheduling // 開啟定時(shí)任務(wù)

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