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Java NIO ServerSocketChannel

2016-03-12 22:49 501 查看

Opening a ServerSocketChannel
Closing a ServerSocketChannel
Listening for Incoming Connections
Non-blocking Mode

Jakob Jenkov

Last update: 2014-06-25

A Java NIO ServerSocketChannel is a channel that can listen for incoming TCP connections, just like a

ServerSocket

in
standard Java Networking. The

ServerSocketChannel

class is located in the

java.nio.channels

package.

Here is an example:

ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();

serverSocketChannel.socket().bind(new InetSocketAddress(9999));

while(true){
SocketChannel socketChannel =
serverSocketChannel.accept();

//do something with socketChannel...
}

Opening a ServerSocketChannel

You open a

ServerSocketChannel

by calling the

ServerSocketChannel.open()

method. Here is how that looks:

ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();

Closing a ServerSocketChannel

Closing a

ServerSocketChannel

is done by calling the

ServerSocketChannel.close()

method. Here is how that looks:

serverSocketChannel.close();

Listening for Incoming Connections

Listening for incoming connections is done by calling the

ServerSocketChannel.accept()

method. When the

accept()

method returns, it returns a

SocketChannel

with an incoming connection. Thus, the

accept()

method
blocks until an incoming connection arrives.

Since you are typically not interested in listening just for a single connection, you call the

accept()

inside a while-loop. Here is how that looks:

while(true){
SocketChannel socketChannel =
serverSocketChannel.accept();

//do something with socketChannel...
}

Of course you would use some other stop-criteria than

true

inside the while-loop.

Non-blocking Mode

ServerSocketChannel

can be set into non-blocking mode. In non-blocking mode the

accept()

method returns immediately, and may thus return null, if no incoming connection had arrived. Therefore you will have to check if the returned

SocketChannel

is
null. Here is an example:

ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
serverSocketChannel.socket().bind(new InetSocketAddress(9999));
serverSocketChannel.configureBlocking(false);

while(true){
SocketChannel socketChannel =
serverSocketChannel.accept();

if(socketChannel != null){
//do something with socketChannel...
}
}

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