Spring定时任务和rescheduleJob

配置spring自定义定时任务

InitializingCronTrigger 在系统部署时候从数据库读取时间：

package com.paxsz.tms.crontab;

import java.io.Serializable;

import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.scheduling.quartz.CronTriggerBean;

import com.paxsz.tms.admin.model.TmstCrontab;
import com.paxsz.tms.admin.service.CrontabService;
import com.paxsz.tms.crontab.dao.ScheduleInfoManager;

public class InitializingCronTrigger extends CronTriggerBean implements Serializable {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	private ScheduleInfoManager scheduleInfoManager;
	
	@Autowired
	@Qualifier("tmsCrontabService")
	private CrontabService crontabService;

	// 设值注入，通过setter方法传入被调用者的实例scheduleInfoManager
	public void setScheduleInfoManager(ScheduleInfoManager scheduleInfoManager) throws Exception {
		this.scheduleInfoManager = scheduleInfoManager;
		// 因为在getCronExpressionFromDB使用到了scheduleInfoManager，所以
		// 必须上一行代码设置scheduleInfoManager后进行getCronExpressionFromDB
		String cronExpression = getCronExpressionFromDB(); // ①
		// 因为extends CronTriggerBean ，此处调用父类方法初始化cronExpression
		setCronExpression(cronExpression); // ②
	}

	private String getCronExpressionFromDB() throws Exception {
		String dbCronExpression = "0 * * * * ? 2099";
		TmstCrontab tmstCrontab = crontabService.get(new Long(1));
		if(tmstCrontab == null){
			return dbCronExpression;
		}
		String minute = StringUtils.isEmpty(tmstCrontab.getCron_minute()) ? "*" : tmstCrontab.getCron_minute();
		String hour = StringUtils.isEmpty(tmstCrontab.getCron_hour()) ? "*" : tmstCrontab.getCron_hour();
		String day = StringUtils.isEmpty(tmstCrontab.getCron_day()) ? "?" : tmstCrontab.getCron_day();
		String month = StringUtils.isEmpty(tmstCrontab.getCron_month()) ? "*" : tmstCrontab.getCron_month();
		String week = StringUtils.equals(day, "?") ? (StringUtils.isEmpty(tmstCrontab.getCron_week()) ? "*" : tmstCrontab.getCron_week()) : "?";
		String year = StringUtils.isEmpty(tmstCrontab.getCron_year()) ? "*" : tmstCrontab.getCron_year();
		dbCronExpression ="0 " + minute + " " + hour + " " + day + " " + month + " " + week + " " + year;
		return dbCronExpression;
	}

	public ScheduleInfoManager getScheduleInfoManager() {
		return scheduleInfoManager;
	}

}

定时任务ScheduleInfoAction

package com.paxsz.tms.crontab;

import java.net.URL;

import org.apache.commons.lang.StringUtils;
import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.expression.ParseException;
import org.springframework.scheduling.quartz.CronTriggerBean;
import com.paxsz.tms.admin.model.TmstCrontab;
import com.paxsz.tms.admin.service.BackupInfoService;
import com.paxsz.tms.admin.service.CrontabService;
import com.paxsz.tms.admin.web.util.BackupRunnable;

public class ScheduleInfoAction {

	public static final String BACKUP_SHELL_FILE = "backup.sh";
	
	public static final String RESOURCES_FILE = "resources.properties";
	
	public static String bakdirtemp = "/home/backup";
	
	private Scheduler scheduler; 
	
	@Autowired
	@Qualifier("tmsBackupInfoService")
	private BackupInfoService backupInfoService;
	
	@Autowired
	@Qualifier("tmsCrontabService")
	private CrontabService crontabService;
	
	@SuppressWarnings("unused")
	private void reScheduleJob() throws SchedulerException, ParseException, Exception {

		// 运行时可通过动态注入的scheduler 得到trigger

		CronTriggerBean trigger = (CronTriggerBean) scheduler.getTrigger("cronTrigger", Scheduler.DEFAULT_GROUP);

		String dbCronExpression = getCronExpressionFromDB();

		String originConExpression = trigger.getCronExpression();
		// 判断从DB 中取得的任务时间(dbCronExpression) 和现在的quartz
		// 线程中的任务时间(originConExpression) 是否相等

//		 如果相等，则表示用户并没有重新设定数据库中的任务时间，这种情况不需要重新rescheduleJob

		if (!originConExpression.equalsIgnoreCase(dbCronExpression)) {

			trigger.setCronExpression(dbCronExpression);
			
			scheduler.rescheduleJob("cronTrigger", Scheduler.DEFAULT_GROUP, trigger);
		}
		
		Long id = this.backupInfoService.initBackupInfo(bakdirtemp, "0");
		// 下面是具体的job 内容，可自行设置
		// executeJobDetail();
		try{
			URL url = this.crontabService.getResourcesFile(BACKUP_SHELL_FILE);
			Runtime run = Runtime.getRuntime();
			Process chmodProcess = run.exec("chmod +x " + url.getPath());
			if(chmodProcess.waitFor() != 0){
				this.backupInfoService.updateStatusById(id, "-1", "msg.backup.authright.failed");
			}
			
			Thread t = new Thread(new BackupRunnable(this.crontabService.getBackupProcessBuilder(id), this.backupInfoService, id));
			t.start();	
		}catch(Exception e){
			this.backupInfoService.updateStatusById(id, "-1", "msg.backup.authright.failed");
		}
	}

	private String getCronExpressionFromDB() throws Exception {
		String dbCronExpression = "0 * * * * ? 2099";
		TmstCrontab tmstCrontab = crontabService.get(new Long(1));
		if(tmstCrontab == null){
			return dbCronExpression;
		}
		String minute = StringUtils.isEmpty(tmstCrontab.getCron_minute()) ? "*" : tmstCrontab.getCron_minute();
		String hour = StringUtils.isEmpty(tmstCrontab.getCron_hour()) ? "*" : tmstCrontab.getCron_hour();
		String day = StringUtils.isEmpty(tmstCrontab.getCron_day()) ? "?" : tmstCrontab.getCron_day();
		String month = StringUtils.isEmpty(tmstCrontab.getCron_month()) ? "*" : tmstCrontab.getCron_month();
		String week = StringUtils.equals(day, "?") ? (StringUtils.isEmpty(tmstCrontab.getCron_week()) ? "*" : tmstCrontab.getCron_week()) : "?";
		String year = StringUtils.isEmpty(tmstCrontab.getCron_year()) ? "*" : tmstCrontab.getCron_year();
		dbCronExpression ="0 " + minute + " " + hour + " " + day + " " + month + " " + week + " " + year;
		bakdirtemp = StringUtils.isNotEmpty(tmstCrontab.getBakdir()) ? tmstCrontab.getBakdir() : "/home/backup";		
		return dbCronExpression;
	}

//	public Scheduler getScheduler() {
//		return scheduler;
//	}

	public void setScheduler(Scheduler scheduler) {
		this.scheduler = scheduler;
	}
}

动态修改定时任务

public ModelAndView scheduleBackup(HttpServletRequest request, Model model,
			@ModelAttribute("command") BackupForm backupForm) throws Exception {
		String minute = StringUtils.isEmpty(backupForm.getMinute()) ? "*"
				: backupForm.getMinute();
		String hour = StringUtils.isEmpty(backupForm.getHour()) ? "*"
				: backupForm.getHour();
		String day = StringUtils.isEmpty(backupForm.getDay()) ? "?"
				: backupForm.getDay();
		String month = StringUtils.isEmpty(backupForm.getMonth()) ? "*"
				: backupForm.getMonth();
		String week = StringUtils.equals(day, "?") ? (StringUtils
				.isEmpty(backupForm.getDayofweek()) ? "*" : StringUtils.equals(backupForm.getDayofweek(),"?") ? "*" : backupForm.getDayofweek()) : "?";
		String year = "*";
		String dbCronExpression = "0 " + minute + " " + hour + " " + day + " "	+ month + " " + week + " " + year;
		CronTriggerBean trigger = (CronTriggerBean) scheduler.getTrigger("cronTrigger", Scheduler.DEFAULT_GROUP);

		trigger.setCronExpression(dbCronExpression);
		
		trigger.setStartTime(new Date());

		scheduler.rescheduleJob("cronTrigger", Scheduler.DEFAULT_GROUP, trigger);

		backupForm.setYear("*");
		this.crontabService.saveOrUpdate(backupForm);
		return this.ajaxDoneSuccess(this.getMessage("msg.operation.success"));
	}

如果不设置setStartTime，那么根据系统部署的时间不同，可能会在rescheduleJob的时候，立刻执行一次计划任务。