how to stop a running thread

[zhengyw zhengyw]

in my project,i use thread to dispatch my request to the service in my contorller,and the process is synchronized,that is ,in my thread's run() body,call a service's method,maybe the method last for a long time,then the user of client application maybe cancel this request,so in the executing of a thread,how can i stop it and then return the thread to a vector?thanks

[Pavel Halas]

If I understand you, you would make the thread to stop using some user action (button click)...
You should create a boolean field that should be periodically checked. If the action is long-lasting, this could be combined with a process indication.

[zhengyw zhengyw]

yeah,i want to do that,but i how can i implement that idea?may i have to check a boolean field in the every running code line of a thread?

[Jason Kosowan]

Hi guys
Actually, there are mechanisms built into Java to do this kind of thing.
To stop a running thread, the class that stops the thread must call

runningthread.interrupt();

But, this alone is not enough. Within the thread, I've successfully used the following in a method that is declared to throw InterruptedException.

if (Thread.currentThread().isInterrupted())
{
    throw new InterruptedException(""I've been interrupted!"
}

Interspersing these calls at appropriate times within the thread (i.e. between critical operations) will give a responsive and safe way to stop and start things.
If you want to see this in action, my little open-source project Spiderfish uses this type of interruption with Swing/JFC.
Spiderfish Project
Hope this helps.