If you don’t actively close the thread pool, there will be some dormant threads in the pool, which will usually be shut down after 1 minute. So if a thread pool is used in a web project, it is best to turn off the initialized thread pool in the ServletContextListener.destroy method, usually using shutdown() 或 shutdownNow() ，如果做得完善些，可以再加上 awaitTermination such processing.
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If you don’t actively close the thread pool, there will be some dormant threads in the pool, which will usually be shut down after 1 minute.
So if a thread pool is used in a web project, it is best to turn off the initialized thread pool in the ServletContextListener.destroy method, usually using
shutdown()或shutdownNow()，如果做得完善些，可以再加上awaitTerminationsuch processing.