问题
What is the best way to set a timeout to close a NIO SocketChannel if there is no data is received for a certain period after the connection is established?
回答1:
Either:
You are using a
Selector, in which case you have a select timeout which you can play with, and if it goes off (select(timeout)returns zero) you close all the registered channels, orYou are using blocking mode, in which case you might think you should be able to call
Socket.setSoTimeout()on the underlying socket (SocketChannel.socket()), and trap theSocketTimeoutExceptionthat is thrown when the timeout expires duringread(), but you can't, because it isn't supported for sockets originating as channels, orYou are using non-blocking mode without a
Selector, in which case you need to change to case (1).
So you either need to use case (1) or a java.net.Socket directly.
回答2:
I was looking for the same recommendation and could not find it easily - sharing it here.
There is a nice handler for netty called: ReadTimeoutHandler.
One can use it like that
channel.pipeline().addLast(new ReadTimeoutHandler(readTimeout));
it will drop io.netty.handler.timeout.ReadTimeoutException when failed to see any data doing the defined read timeout.
来源：https://stackoverflow.com/questions/17340970/read-timeout-for-an-nio-socketchannel