89.md

在 Quartz 作业中注入 Spring 依赖项

原文： https://howtodoinjava.com/spring-batch/spring-beans-in-quartz-job/

默认情况下，Quartz 无法识别在applicationContext.xml或带有@Bean注解的 SpringBean。 如果尝试以 Quartz Job或QuartzJobBean来@Autowired这些 bean，您将得到NullPointerException。

将 Spring 上下文注入QuartzJobBean

解决方案是将 Spring 的ApplicationContext实例注入到org.quartz.SchedulerContext中，该实例可通过executeInternal()方法的org.quartz.JobExecutionContext参数使用。

1. 将ApplicationContext注入SchedulerContext

   这是典型的SchedulerFactoryBean bean 条目。 使用setApplicationContextSchedulerContextKey()方法。 此方法设置要在SchedulerContext中公开的ApplicationContext引用的键。

   @Bean
   public SchedulerFactoryBean schedulerFactoryBean() throws IOException, SchedulerException 
   {
   	SchedulerFactoryBean scheduler = new SchedulerFactoryBean();
   	scheduler.setTriggers(jobOneTrigger(), jobTwoTrigger());
   	scheduler.setQuartzProperties(quartzProperties());
   	scheduler.setJobDetails(jobOneDetail(), jobTwoDetail());
   	scheduler.setApplicationContextSchedulerContextKey("applicationContext");
   	return scheduler;
   }

2. 在 Quartz QuartzJobBean 中访问注入 bean

   现在，您需要做的就是 – 获得applicationContext参考，并根据需要开始获取 bean。

   CustomQuartzJob.java

   import org.quartz.JobExecutionContext;
   import org.quartz.JobExecutionException;
   import org.springframework.batch.core.Job;
   import org.springframework.batch.core.JobParameters;
   import org.springframework.batch.core.JobParametersBuilder;
   import org.springframework.batch.core.configuration.JobLocator;
   import org.springframework.batch.core.launch.JobLauncher;
   import org.springframework.context.ApplicationContext;
   import org.springframework.scheduling.quartz.QuartzJobBean;
   
   public class CustomQuartzJob extends QuartzJobBean {
   
   	private String jobName;
   	private JobLauncher jobLauncher;
   	private JobLocator jobLocator;
   
   	public String getJobName() {
   		return jobName;
   	}
   
   	public void setJobName(String jobName) {
   		this.jobName = jobName;
   	}
   
   	@Override
   	protected void executeInternal(JobExecutionContext context) throws JobExecutionException 
   	{
   		try 
   		{
   			ApplicationContext applicationContext = (ApplicationContext) 
   							context.getScheduler().getContext().get("applicationContext");
   
   			jobLocator = (JobLocator) applicationContext.getBean(JobLocator.class);
   			jobLauncher = (JobLauncher) applicationContext.getBean(JobLauncher.class);
   
   			Job job = jobLocator.getJob(jobName);
   			JobParameters params = new JobParametersBuilder()
   					.addString("JobID", String.valueOf(System.currentTimeMillis()))
   					.toJobParameters();
   
   			jobLauncher.run(job, params);
   		} 
   		catch (Exception e) 
   		{
   			e.printStackTrace();
   		}
   	}
   }

现在，当您运行 Quartz 作业时，将通过executeInternal()方法获得jobLocator和jobLauncher实例。

将我的问题放在评论部分。

学习愉快！