Java NIO ServerSocketChannel

Java NIO ServerSocketChannel是一個監聽傳入的TCP連接配接的通道，就像标準Java Networking中的ServerSocket一樣。 ServerSocketChannel類位于java.nio.channels包中。

一個例子：

ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();

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

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

    //do something with socketChannel...
}
      

1.打開一個ServerSocketChannel

可以通過調用ServerSocketChannel.open（）方法來打開ServerSocketChannel：

ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
      

2.關閉ServerSocketChannel

通過調用ServerSocketChannel.close（）方法來關閉ServerSocketChannel：

serverSocketChannel.close();
      

3.監聽連接配接

通過調用ServerSocketChannel.accept（）方法來監聽連接配接。當accept（）方法傳回時，它将傳回連接配接的SocketChannel。是以，accept（）方法将阻塞，直到傳入連接配接到達為止。

通常不會僅監聽一個連接配接，是以可以在while循環内調用accept（）：

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

    //do something with socketChannel...
}
      

4.非阻塞模式

可以将ServerSocketChannel設定為非阻塞模式，在非阻塞模式下，accept（）方法立即傳回，如果沒有連接配接到達，則傳回null。是以，必須檢查傳回的SocketChannel是否為null：

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...
        }
}
      

原文位址： https://www.zhblog.net/go/java/tutorial/java-nio-server-socket-channel?t=617