Question

This question already has answers here:

How to run a background task in a servlet based web application? (5 answers)

Closed 8 years ago.

I m 开发一个Java App(JSF 2.0),使用Tamcat 7.0。我需要每天发送电子邮件。我会使用 Java邮发送电子邮件,但我如何在一定时间每天发送电子邮件。中午?

any!

Answer 1

由于Tomcat是一个简单的服务器,不提供在时间安排上修建的设施,也不支持手提的EJB@Sequle说明,你需要管理日程安排,或使用Kartz等第3个政党图书馆,或者只将工作委托给基本的操作系统平台,像Windows平台和Cron平台的预定设施。



在使用标准案文<<<<<<>>时,您可使用http://docs.oracle.com/javaee/6/api/javax/servlet/ServletContextListener.html” rel=“nofollow noreferer”>> 代码>>>>>>> 启动时间表的初始化,并可使用

这里的例子有:


@WebListener
public class Config implements ServletContextListener {

    private ScheduledExecutorService scheduler;

    @Override
    public void contextInitialized(ServletContextEvent event) {
        long secondsUntilNoon = calculateItSomehow();
        long secondsPerDay = 60 * 60 * 24;
        scheduler = Executors.newSingleThreadScheduledExecutor();
        scheduler.scheduleAtFixedRate(new Mailer(), secondsUntilNoon, secondsPerDay, TimeUnit.SECONDS);
    }

    @Override
    public void contextDestroyed(ServletContextEvent event) {
        scheduler.shutdownNow();
    }

}


在<密码>的<类别”中,仅看上去:

public class Mailer implements Runnable {

    @Override
    public void run() {
        // Do your mailing job here.
    }

}


See also:


Spawning threads in a JSF managed bean for scheduled tasks using a timer
Background timer task in JSP/Servlet web application

Answer 2

最佳和灵活的解决办法是使用Quartz列表器。你们都需要创造一份工作岗位,并根据你的具体要求启动工作。

For details refer to the official documents

http://quartz-scheduler.org/documentation/quartz-2.1.x/tutorials/"rel=“nofollow> 图瓦卢

Answer 3

You can use the timer task http://www.ibm.com/developerworks/java/library/j-schedule/index.html

Or Quartz scheduler http://www.quartz-scheduler.org/download/

Answer 4

you can schedule you email your Quartz scheduler as Umesh suggested, you can use the below code to start off:

//set quartz properties in propreties file or map

SchedulerFactory schedFact = new StdSchedulerFactory();

Scheduler sched = schedFact.getScheduler();

//set these parameters
JobDetail jobDetail = new JobDetail( "Email Job" , Scheduler.DEFAULT_GROUP , MyEmailAction.class );

//add data or objects you may require in your scheduled job
JobDataMap dataMap = jobDetail.getJobDataMap();

dataMap.put("mydata", myDataObj);

SimpleTrigger st = new SimpleTrigger();

st.setName("DeployTrigger");            

//set the time when you want to send email

st.setStartTime( java.util.Date );

sched.scheduleJob( jobDetail , st  );

sched.start();

See also:

友情链接