十、Java NIO ServerSocketChannel

所有文章

https://www.cnblogs.com/lay2017/p/12901123.html

正文

ServerSocketChannel不直接传输数据，但是它可以监听TCP连接，就像是ServerSocket一样

ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();

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

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

    //do something with socketChannel...
}

打开一个ServerSocketChannel

ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();

关闭一个ServerSocketChannel

serverSocketChannel.close();

监听tcp连接

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

    //do something with socketChannel...
}

accept方法会阻塞等待SocketChannel返回

非阻塞模式

ServerSocketChannel可以被设置为非阻塞模式。在非阻塞模式中accept方法会立即返回，所以可能返回一个null，如果没有tcp连接建立的话。因此，你需要校验返回值SocketChannel是否为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...
        }
}