在应用程序服务器中运行java“后台应用程序”

Question

My experience with application servers is limited to some basic servlet coding, so I am not even sure how to frame this question appropriately.

I need to write a java program that runs on the (java) application server and continuously executes a certain method (it will check for files in a certain directory).

I have found a way to schedule the start of applications but need to know where to put the code that I would normally put in the main() method in a regular java program.

Answer 1

没有直接回答您的问题，但请查看可能有用的Spring Batch 。

Answer 2

Take a look at the servlet event listeners.

I think you should be able to hook into your code using a ServletContextListener .

http://onjava.com/pub/a/onjava/2001/04/12/listeners.html

Answer 3

You can use Quartz , or the EJB timer service (if you can learn EJBs) for this task.

If you have just a servlet container like Tomcat, it is preferable to go with Quartz. In fact, Quartz also comes with a web application to monitor a scheduler .

On the other hand, the EJB timer service is available in all EJB containers that support EJB 2.1 and above.

Answer 4

这样做的一种方法是编写一个实现ServletContextListener的Listener，然后编写您在contextInitialized方法中安排计时器