作业调度框架Quartz

Quartz是一个开源的作业调度框架，它完全由Java写成，并设计用于J2SE和J2EE应用中。它提供了巨大的灵 活性而不牺牲简单性。你能够用它来为执行一个作业而创建简单的或复杂的调度。它有很多特征，如：数据库支持，集群，插件，EJB作业预构 建，JavaMail及其它，支持cron-like表达式等等。

该项目已经被 Terracotta收购。

 

例子：下面我们就来实现一个例子,每隔六分钟就在指定的目录统计xml文件和各个xml文件的大小.

 

上代码：

import java.io.File;
import java.io.FileFilter;
import java.util.Date;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.quartz.Job;
import org.quartz.JobDataMap;
import org.quartz.JobDetail;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;


public class ScanDirectoryJob implements Job {
    static Log logger = LogFactory.getLog(ScanDirectoryJob.class);

    @Override
    public void execute(JobExecutionContext context) throws JobExecutionException {
        JobDetail jobDetail = context.getJobDetail();
        String jobName = jobDetail.getKey().getName();
        
        logger.info(jobName + " fire at " + new Date());
        //System.out.println(jobName + " fire at " + new Date());
        JobDataMap dataMap = jobDetail.getJobDataMap();
        String dirName = dataMap.getString("scan");
        
        if(null == dirName){
            throw new JobExecutionException("Directory not fount");
        }
        
        File dir = new File(dirName);
        if(!dir.exists()){
            throw new JobExecutionException("Invalid dir" + dirName);
        }
        
        File[] files = dir.listFiles(new FileFilter(){

            @Override
            public boolean accept(File f) {
                if(f.getName().endsWith(".xml") && f.isFile())
                    return true;
                return false;
            }
        });
        
        if(files == null || files.length <= 0){
            logger.info("no xml file exists in " + dir);
            return;
        }
        
        int size = files.length;
        
        for(int i = 0; i < size; i++){
            File file = files[i];
            File aFile = file.getAbsoluteFile();
            long fileSize = file.length();
            String msg = aFile + ", Size: " + fileSize;
            logger.info(msg);
        }
        
    }

}

 

import java.util.Date;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.quartz.DailyTimeIntervalScheduleBuilder;
import org.quartz.DailyTimeIntervalTrigger;
import org.quartz.JobBuilder;
import org.quartz.JobDetail;
import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.quartz.SimpleScheduleBuilder;
import org.quartz.SimpleTrigger;
import org.quartz.TriggerBuilder;
import org.quartz.core.SchedulerSignalerImpl;
import org.quartz.impl.StdSchedulerFactory;


public class SimpleScheduler {
    static Log logger = LogFactory.getLog(SimpleScheduler.class);
    
    public static void main(String[] args) {
        SimpleScheduler simple = new SimpleScheduler();
        
        try{
            Scheduler scheduler = simple.createScheduler();
            simple.scheduleJob(scheduler);
            
            
            scheduler.start();
            
            logger.info("Schedule stated at " + new Date());
            
        } catch (SchedulerException e) {
            logger.info(e);
        }
    }
    
    public Scheduler createScheduler() throws SchedulerException{
        return StdSchedulerFactory.getDefaultScheduler();
    }
    
    private void scheduleJob(Scheduler scheduler) throws SchedulerException{
        JobDetail jobDetail = JobBuilder.newJob(ScanDirectoryJob.class).withIdentity("myJob").build();
        
        jobDetail.getJobDataMap().put("scan", "D:\\360Downloads\\quartz-2.1.5\\quartz-2.1.5\\examples");
        
        SimpleTrigger trigger = TriggerBuilder.newTrigger().withIdentity("class")
                .withSchedule(SimpleScheduleBuilder.simpleSchedule().withRepeatCount(2)
                .withIntervalInMilliseconds(6000)).build();
        
/*        DailyTimeIntervalTrigger dailyTrigger = TriggerBuilder.newTrigger().withIdentity("Daily trigger")
                .withSchedule(DailyTimeIntervalScheduleBuilder.dailyTimeIntervalSchedule().withIntervalInHours(1)
                        .withRepeatCount(0)).build();*/

        
        scheduler.scheduleJob(jobDetail, trigger);
    }
}

 

因为里面用到了log4j,所以你可以添加一个资源文件：

# Configure logging for testing
log4j.rootLogger=INFO, stdout

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n

 

结果:

2012-08-06 10:11:01,068 INFO [SimpleScheduler] - Schedule stated at Mon Aug 06 10:11:01 CST 2012
2012-08-06 10:11:01,076 INFO [ScanDirectoryJob] - myJob fire at Mon Aug 06 10:11:01 CST 2012
2012-08-06 10:11:01,077 INFO [ScanDirectoryJob] - D:\360Downloads\quartz-2.1.5\quartz-2.1.5\examples\build.xml, Size: 1613
2012-08-06 10:11:01,077 INFO [ScanDirectoryJob] - D:\360Downloads\quartz-2.1.5\quartz-2.1.5\examples\pom.xml, Size: 6085
2012-08-06 10:11:07,056 INFO [ScanDirectoryJob] - myJob fire at Mon Aug 06 10:11:07 CST 2012
2012-08-06 10:11:07,056 INFO [ScanDirectoryJob] - D:\360Downloads\quartz-2.1.5\quartz-2.1.5\examples\build.xml, Size: 1613
2012-08-06 10:11:07,056 INFO [ScanDirectoryJob] - D:\360Downloads\quartz-2.1.5\quartz-2.1.5\examples\pom.xml, Size: 6085
2012-08-06 10:11:13,057 INFO [ScanDirectoryJob] - myJob fire at Mon Aug 06 10:11:13 CST 2012
2012-08-06 10:11:13,057 INFO [ScanDirectoryJob] - D:\360Downloads\quartz-2.1.5\quartz-2.1.5\examples\build.xml, Size: 1613
2012-08-06 10:11:13,057 INFO [ScanDirectoryJob] - D:\360Downloads\quartz-2.1.5\quartz-2.1.5\examples\pom.xml, Size: 6085