How to send mail within a servlet using threads or executor service?

Question

I want to send mail based on if a condition

ServletMail.java

//somecodes

//this code should code should be executed in background(by threads or something)

if(cond1){

sendmail(firstcond)

}

else{

sendmail(secondcond)

}

//requestdispatcher

Answer 1

You can use ExecutorService executorService = Executors.newFixedThreadPool(threadNumber); . There threadNumber is concurrent use threads.

1. If you use IOC then you can declaration bean
2. Second way simple executorService declaration how static variable;

You can use it like this

   if(cond1){
        executorService.execute(new Runnable() {
            @Override
            public void run() {
                sendmail(firstcond);
            }
        });
    } else{
        executorService.execute(new Runnable() {
            @Override
            public void run() {
                sendmail(secondcond);
            }
        });
    }

Do not forget put this executorService.shutdown(); to web server shutdown listener.