Why a “java.net.SocketException: Broken pipe” will occur?

Question

I wrote a simple socket programme, it works fine, but my friend use a port scanning tool, when it scan to the port I am using, it cash with \"java.net.SocketException: Broke

Answer 1

Some port scanners work by starting to open a connection and then immediately terminating it. Your server is not programmed to deal with a connection failure because you did not code for that possibility. You will need to use a try/catch to trap that condition and recover. Also, you should probably be handing off the connection to a separate thread for processing, so your main program can continue to receive new connections (and sending them to threads to be handled).