How to detect the disconnect event

Question

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Java: How do detect a remote side socket close?

I'm writing a small program using java with Socket and ServerSocket. I have a Server and some Clients, When User(Client) close the Window, the connection between Client and Server will be closed.

My problem is on server, I can't detect that close event. Who can help me.

I can send a message from client to server to notify this event before close the connection. But if user end process from tast manager (javaw.exe), this solution will impossible.

score 2 · Accepted Answer · answered May 18 '11 at 10:33

2

The only and only true way of finding out is to actually try to write something to the remote channel. It will throw appropriate exception if the socket is closed(similarly applies for reading, but it could return a -1 instead)

answered May 18 '11 at 10:33

Suraj Chandran

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Some time client don't send any thing to server. So this solution, i think it will not work exactly – Võ Quang Hòa May 18 '11 at 10:39
@Vo, it still wil work. Because it will throw exception anyway. – Suraj Chandran May 28 '11 at 08:32

How to detect the disconnect event

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