springboot整合spring-boot-starter-quartz是实现cron定时任务的详细步骤及代码案例

Spring Boot整合Quartz实现cron定时任务的步骤如下：

1.在pom.xml中添加依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-quartz</artifactId>
</dependency>

2.创建Job类

public class MyJob implements Job {
    @Override
    public void execute(JobExecutionContext context) throws JobExecutionException {
        // 这里编写具体的定时任务
    }
}

3.创建JobDetail和Trigger

@Configuration
public class QuartzConfig {
    @Bean
    public JobDetail myJobDetail() {
        return JobBuilder.newJob(MyJob.class).withIdentity("myJob").storeDurably().build();
    }

    @Bean
    public Trigger myTrigger() {
        return TriggerBuilder.newTrigger().forJob(myJobDetail())
                .withIdentity("myTrigger").withSchedule(CronScheduleBuilder.cronSchedule("0 0 0 * * ?")).build();
    }
}

4.启动定时任务

@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

    @Autowired
    private Scheduler scheduler;

    @Autowired
    private Trigger myTrigger;

    @Autowired
    private JobDetail myJobDetail;

    @PostConstruct
    public void start() throws SchedulerException {
        scheduler.scheduleJob(myJobDetail, myTrigger);
    }
}

这里的注解`@PostConstruct`表示在Bean初始化之后执行该方法。

5.编写具体的定时任务逻辑

public class MyJob implements Job {
    @Override
    public void execute(JobExecutionContext context) throws JobExecutionException {
        System.out.println("定时任务执行了！");
    }
}

完整的代码示例：

// MyJob.java
public class MyJob implements Job {
    @Override
    public void execute(JobExecutionContext context) throws JobExecutionException {
        System.out.println("定时任务执行了！");
    }
}

// QuartzConfig.java
@Configuration
public class QuartzConfig {
    @Bean
    public JobDetail myJobDetail() {
        return JobBuilder.newJob(MyJob.class).withIdentity("myJob").storeDurably().build();
    }

    @Bean
    public Trigger myTrigger() {
        return TriggerBuilder.newTrigger().forJob(myJobDetail())
                .withIdentity("myTrigger").withSchedule(CronScheduleBuilder.cronSchedule("0 0 0 * * ?")).build();
    }
}

// Application.java
@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

    @Autowired
    private Scheduler scheduler;

    @Autowired
    private Trigger myTrigger;

    @Autowired
    private JobDetail myJobDetail;

    @PostConstruct
    public void start() throws SchedulerException {
        scheduler.scheduleJob(myJobDetail, myTrigger);
    }
}

这里的定时任务是每天凌晨0点执行一次，并打印一句话。