Quartz Scheduler(2.2.1) - Usage of JobDataMap-优快云博客

本文详细介绍了如何使用Quartz中的JobDataMap来存储和检索任务执行所需的数据。通过示例展示了如何在定义JobDetail时将数据放入JobDataMap，并在任务执行过程中获取这些数据。此外还介绍了通过设置setter方法简化数据访问的过程。

The JobDataMap can be used to hold any amount of (serializable) data objects which you wish to have made available to the job instance when it executes. JobDataMap is an implementation of the Java Map interface, and has some added convenience methods for storing and retrieving data of primitive types.

Here's some snippets of putting data into the JobDataMap while defining/building the JobDetail, prior to adding the job to the scheduler:

JobDetail jobDetail = JobBuilder.newJob(HelloJob.class)
                                .withIdentity("helloJob", Scheduler.DEFAULT_GROUP)
                                .usingJobData("msg", "hello JobDataMap.")
                                .build();

Here is an example of getting data from the JobDataMap during the job's execution:

public class HelloJob implements Job {
    
    public void execute(JobExecutionContext context) throws JobExecutionException {
        String msg = context.getJobDetail().getJobDataMap().getString("msg");
        System.out.println("msg: " + msg);
    }
    
}

If you add setter methods to your job class that correspond to the names of keys in the JobDataMap (such as a setMsg(String msg) method for the data in the example above), then Quartz's default JobFactory implementation will automatically call those setters when the job is instantiated, thus preventing the need to explicitly get the values out of the map within your execute method.

public class HelloJob implements Job {
    
    @Setter
    private String msg;
    
    public void execute(JobExecutionContext context) throws JobExecutionException {
        System.out.println("msg: " + msg);
    }
    
}

转载于:https://www.cnblogs.com/huey/p/5106117.html