10 Java NIO ServerSocketChannel-翻译

Java NIO ServerSocketChannel是一个监听TCP链接的Channel，如Java 标准网络中的ServerSocket。ServerSocketChannel类是在java.nio.channels包下。

下面是一个例子：

ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
serverSocketChannel.socket.bind(new InetAddress(9990));

while(true){
    SocketChannel socketChannel = serverSocketChannle.accept();
    // do something with socketChannel
}
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Opening a ServerSocketChannel

能够经过ServerSocketChannel的open方法来打开ServerSocketChannel。以下所示：

ServerSocketChannel serverSocketChannel =  ServerSocketChannel.open();
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Closing a ServerSocketChannel

关闭ServerSocketChannel能够经过ServerSocketChannel的close()方法来实现。以下所示： serverSocketChannel.close();

Listening for Incoming Connections

能够经过ServerSocketChannel的accept()来监听新进来的链接。当accept()方法返回时，它将返回SocketChannel对象。所以，accept()方法会阻塞直接有新的链接进来。

一般不会仅仅只监听一个链接,在while循环中调用 accept()方法. 以下面的例子：

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

    //do something with socketChannel...
}
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固然也能够在while循环中使用除了true之外的其余条件。

Non-blocking Mode

一个ServerSocketChannel能够被设置工做在非阻塞模式。在非阻塞模式中，accept()方法会当即返回。所以它可能会返回null若是没有新的链接进来。所以，你必须检查返回的SocketChannel对象是否为null。

ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
serverSocketChannel.socket().bind(new InetSocketAddress(9990));
serverSocketChannel.configureBlocking(false);

while(true){
    SocketChannel socketChannel = serverSocketChannel.accept();
    if(seocketChannle != null){
        // do something with socketChannel...
    }
}
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