Quartz實現定時任務

1、入口類 QuartzTask.java
項目加載： Constructor (構造方法) >>@Autowired（依賴注入） > @PostConstruct （初始化）
可以將需要執行的類配置在數據庫中，查數據庫循環數據

@Component
public class QuartzTask {

    private Logger log = LoggerFactory.getLogger(QuartzTask.class);

    @Autowired
    TaskService taskService;

    @PostConstruct
    public void task()throws SchedulerException {
        log.info("線程開始" + new Date());

        // 從數據庫中查出需要批量執行的數據
        taskService.sendTask(TestTaskService.class, "testService", "testGroup", "0/5 * * * * ?");

        log.info("線程結束" + new Date());
    }
}

2、QuartzConfig.java
定時配置類，爲了生成Scheduler(調度器bean)

@Configuration
public class QuartzConfig {
    private Logger log = LoggerFactory.getLogger(QuartzConfig.class);

    @Bean
    public Scheduler scheduled()throws SchedulerException {
        log.info("bulid Scheduler start");
        // 創建一個Scheduler
        // 獲取調度器
        SchedulerFactory schedFact = new StdSchedulerFactory();
        Scheduler sched = schedFact.getScheduler();
        log.info("bulid Scheduler end");
        return sched;
    }
}

3、TaskService.java
任務調度類，構建jobDetail實例，構建基於cron表達式的觸發器，通過調度器將觸發器和job實例關聯

@Service
public class TaskService {

    // 任務調度
    @Autowired
    private Scheduler scheduler;

    public void sendTask(Class jobClass, String name, String group, String cron) throws SchedulerException {

        // 開啓調度器
        scheduler.start();
        // 通過JobBuilder構建JobDetail實例，JobDetail規定只能是實現Job接口的實例
        // JobDetail 是具體Job實例
        JobDetail jobDetail = JobBuilder.newJob(jobClass).withIdentity(name, group).build();
        // 基於表達式構建觸發器
        CronScheduleBuilder cronScheduleBuilder = CronScheduleBuilder.cronSchedule(cron);
        // CronTrigger表達式觸發器 繼承於Trigger
        // TriggerBuilder 用於構建觸發器實例
        CronTrigger cronTrigger = TriggerBuilder.newTrigger().withIdentity(name, group)
                .withSchedule(cronScheduleBuilder).build();
        scheduler.scheduleJob(jobDetail, cronTrigger);

    }
}

4、TestTaskService.java
具體的業務實現類,實現Job接口

public class TestTaskService implements Job {

    private Logger log = Logger.getLogger("TestTaskService.class");

    @Override
    public void execute(JobExecutionContext jobExecutionContext) throws JobExecutionException {

        log.info("test start =============== " + new Date());

    }
}

5、涉及jar包

        <!--quartz定時器的依賴-->
        <dependency>
            <groupId>org.quartz-scheduler</groupId>
            <artifactId>quartz</artifactId>
        </dependency>
        <dependency>
            <groupId>org.quartz-scheduler</groupId>
            <artifactId>quartz-jobs</artifactId>
        </dependency>