当我们使用 spring boot 整合 schedule 创建定时任务时, 出现空指针, 很有可能是因为配置定时任务类, 创建 job 对象的时候, 由于 job 工程接收到任务类创建对象是通过反射创建, 通过放射创建的对象并不会将该对象放入 spring 容器, 而在定时任务类进行注入业务类的时候无法注入. 所以需要手动的将任务类对象放入 spring 容器中.
步骤:
1. 定义创建任务类的类, 并继承 AdaptableJobFactory, 该类负责创建任务类对象, 但是原始的类并没有把创建好的类放入 spring 容器, 所以需要重写其中的方法手动将任务类放入 spring 容器.
2. 将上一步创建的对象放入任务工厂对象中
附加:
定时类配置代码
- package com.example.quartz;
- import org.quartz.CronScheduleBuilder;
- import org.springframework.context.annotation.Bean;
- import org.springframework.context.annotation.Configuration;
- import org.springframework.scheduling.quartz.CronTriggerFactoryBean;
- import org.springframework.scheduling.quartz.JobDetailFactoryBean;
- import org.springframework.scheduling.quartz.SchedulerFactoryBean;
- import org.springframework.scheduling.quartz.SimpleTriggerFactoryBean;
- @Configuration
- public class QuartzConfig {
- // 创建 job 对象
- @Bean
- public JobDetailFactoryBean jobDetailFactoryBean(){
- JobDetailFactoryBean factory = new JobDetailFactoryBean();
- //factory 接收到 QuartzJob 类对象后, 通过反射方式创建对象, 并没有放入 spring 容器中.
- factory.setJobClass(QuartzJob.class);
- return factory;
- }
- // 创建 simple trigger 对象
- @Bean
- public SimpleTriggerFactoryBean simpleTriggerFactoryBean(){
- SimpleTriggerFactoryBean factory = new SimpleTriggerFactoryBean();
- // 关联 jobDetail 对象
- factory.setJobDetail(jobDetailFactoryBean().getObject());
- // 间隔毫秒数
- factory.setRepeatInterval(2000);
- // 重复次数
- return factory;
- }
- // 创建 crontrigger
- @Bean
- public CronTriggerFactoryBean cronTriggerFactoryBean(){
- CronTriggerFactoryBean factory = new CronTriggerFactoryBean();
- factory.setJobDetail(jobDetailFactoryBean().getObject());
- factory.setCronExpression("0/1 * * * * ?");
- return factory;
- }
- @Bean
- public SchedulerFactoryBean schedulerFactoryBean(MyJobDetailFactoryBean myJobDetailFactoryBean){
- SchedulerFactoryBean factory = new SchedulerFactoryBean();
- // 关联 trigger
- factory.setTriggers(simpleTriggerFactoryBean().getObject());
- // 将前面的覆盖掉.
- factory.setTriggers(cronTriggerFactoryBean().getObject());
- factory.setJobFactory(myJobDetailFactoryBean);
- return factory;
- }
- }
来源: http://www.bubuko.com/infodetail-3115603.html