Job Seekers
Find out what works well at Qatar Airways from the people who know best. Get the inside scoop on jobs, salaries, top office locations, and CEO insights. Customers Service(Former Employee) - Al Rusayl Muscat Oman - January 17, Qatar Airways is one of the leading airlines in the world. congratulations i missed it, u did not invite me #QatarAirways #Muscat My daughter is seeking employment in your airline as cabin crew in Qatar she. About Your Job:As the Airport Services Duty Officer, you will be responsible for the overall control of the shift as a direct representative of the Airport.
Quartz Scheduler Cron Job Example
The Quartz Scheduler is an open-source job scheduling library that comes with an extensive set of features. It allows you to schedule and run jobs at specific times, intervals, or even based on certain conditions. One of the most popular ways of scheduling jobs in Quartz is by using the Cron expression. In this article, we will explore how to create a Quartz Scheduler Cron Job example.
Introduction to Quartz Cron Expression
The Cron expression is a string that represents a set of instructions that specify when a job should be executed. It consists of six fields that represent different time elements in a specific order:
* Seconds (0-59)
* Minutes (0-59)
* Hours (0-23)
* Day of the month (1-31)
* Month (1-12)
* Day of the week (0-7) (Sunday is both 0 and 7)
Each field can contain a specific value, a range of values, or a set of values separated by commas. You can also use special characters such as * (any value), / (interval), and ? (no specific value).
Creating a Quartz Cron Job Example
To create a Quartz Cron Job example, we will use the Quartz Scheduler library version 2.x and Java programming language. Here are the steps to follow:
Step 1: Create a Maven Project
Open your IDE and create a new Maven project. Add the Quartz Scheduler dependency in your pom.xml file:
```
org.quartz-scheduler
quartz
2.3.2
```
Step 2: Create a Job Class
Create a new Java class that represents your job. This class must implement the `org.quartz.Job` interface and override the `execute()` method. This method contains the code that will be executed when the job triggers:
```
public class MyJob implements Job {
@Override
public void execute(JobExecutionContext context) throws JobExecutionException {
// Your job code here
}
}
```
Step 3: Create a Trigger
Create a new trigger that will define when the job should be executed. In this example, we will use a Cron trigger that will execute the job every minute:
```
Trigger trigger = TriggerBuilder
.newTrigger()
.withIdentity("TriggerName", "TriggerGroup")
.withSchedule(CronScheduleBuilder.cronSchedule("* * * * * ?"))
.build();
```
The `withIdentity()` method sets the name and group of the trigger. The `withSchedule()` method sets the Cron expression that defines the trigger's schedule.
Step 4: Schedule the Job
Create a new scheduler and schedule the job with the trigger:
```
Scheduler scheduler = StdSchedulerFactory.getDefaultScheduler();
scheduler.start();
JobDetail job = JobBuilder
.newJob(MyJob.class)
.withIdentity("JobName", "JobGroup")
.build();
scheduler.scheduleJob(job, trigger);
```
The `withIdentity()` method sets the name and group of the job. The `scheduleJob()` method schedules the job with the trigger.
Step 5: Run the Example
Run the project and observe the console output. You should see the message printed every minute:
```
public class MyJob implements Job {
@Override
public void execute(JobExecutionContext context) throws JobExecutionException {
System.out.println("Hello Quartz Cron Job!");
}
}
```
Conclusion
In this article, we have learned how to create a Quartz Scheduler Cron Job example. We have explored how to create a Maven project, a job class, a trigger, and how to schedule the job. We hope this example will help you get started with Quartz Scheduler and Cron expressions.
Copyright 2015-2023
SiteMap
RSS
Privice Policy
Contacts