文章目录
一、Spring Boot中使用Quartz框架实现在到期的前一天完成提醒的Java示例代码
二、使用步骤
1.首先,在pom.xml文件中添加Quartz和Spring Boot的依赖:
<dependency>
<groupId>org.quartz-scheduler</groupId>
<artifactId>quartz</artifactId>
<version>2.3.2</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-quartz</artifactId>
</dependency>
2.然后,创建一个继承于QuartzJobBean的任务类,并实现executeInternal方法:
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.springframework.scheduling.quartz.QuartzJobBean;
public class ReminderJob extends QuartzJobBean {
@Override
protected void executeInternal(JobExecutionContext context) throws JobExecutionException {
// 获取任务参数,例如任务到期时间
Date dueDate = (Date) context.getJobDetail().getJobDataMap().get("dueDate");
// 计算到期前一天的日期
Calendar calendar = Calendar.getInstance();
calendar.setTime(dueDate);
calendar.add(Calendar.DAY_OF_MONTH, -1);
Date reminderDate = calendar.getTime();
// 获取当前日期
Date currentDate = new Date();
// 判断是否到达提醒日期
if (currentDate.after(reminderDate)) {
// 执行提醒操作,例如发送邮件或推送通知等
System.out.println("Reminder: Your task is due tomorrow!");
}
}
}
3、最后,在Spring Boot的配置文件中添加Quartz的相关配置:
spring:
quartz:
job-store-type: memory
properties:
org:
quartz:
scheduler:
instanceName: MyScheduler
instanceId: AUTO
jobStore:
class: org.quartz.simpl.RAMJobStore
threadPool:
class: org.quartz.simpl.SimpleThreadPool
threadCount: 5
threadPriority: 5
这个配置文件中,我们指定了Quartz使用内存作为任务存储方式,同时配置了线程池的大小和优先级。
接下来,在Spring Boot的启动类中添加一个SchedulerFactoryBean实例,并设置任务和触发器:
import java.util.Date;
import org.quartz.JobDetail;
import org.quartz.SimpleTrigger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.scheduling.quartz.JobDetailFactoryBean;
import org.springframework.scheduling.quartz.SchedulerFactoryBean;
import org.springframework.scheduling.quartz.SimpleTriggerFactoryBean;
@SpringBootApplication
public class Application {
@Autowired
private JobDetailFactoryBean jobDetailFactoryBean;
@Autowired
private SimpleTriggerFactoryBean simpleTriggerFactoryBean;
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
@Bean
public JobDetailFactoryBean jobDetailFactoryBean() {
JobDetailFactoryBean jobDetailFactoryBean = new JobDetailFactoryBean();
jobDetailFactoryBean.setJobClass(ReminderJob.class);
jobDetailFactoryBean.setDurability(true);
jobDetailFactoryBean.setJobDataMap(new JobDataMap() {
{
put("dueDate", new Date()); // 设置任务参数,例如任务到期时间
}});
return jobDetailFactoryBean;
}
@Bean
public SimpleTriggerFactoryBean simpleTriggerFactoryBean() {
SimpleTriggerFactoryBean simpleTriggerFactoryBean = new SimpleTriggerFactoryBean();
simpleTriggerFactoryBean.setJobDetail(jobDetailFactoryBean.getObject());
simpleTriggerFactoryBean.setRepeatInterval(24 * 60 * 60 * 1000); // 每天执行一次
simpleTriggerFactoryBean.setStartTime(new Date());
return simpleTriggerFactoryBean;
}
@Bean
public SchedulerFactoryBean schedulerFactoryBean() {
SchedulerFactoryBean schedulerFactoryBean = new SchedulerFactoryBean();
schedulerFactoryBean.setJobDetails(new JobDetail[] {
jobDetailFactoryBean.getObject()});
schedulerFactoryBean.setTriggers(new Trigger[] {
simpleTriggerFactoryBean.getObject()});
return schedulerFactoryBean;
}
}
在这个启动类中,我们使用了@Autowired注解将JobDetailFactoryBean和SimpleTriggerFactoryBean注入进来,并在schedulerFactoryBean方法中将它们设置为Scheduler的任务和触发器。
这样,当我们启动Spring Boot应用时,Quartz就会自动启动,并按照我们的配置执行定时任务。