使用java列举几个redis中IO多路复用代码

以下是使用Java实现Redis中IO多路复用的一些示例代码：

1. 使用Netty实现Redis IO多路复用

EventLoopGroup group = new NioEventLoopGroup();
Bootstrap b = new Bootstrap();
b.group(group)
 .channel(NioSocketChannel.class)
 .handler(new ChannelInitializer<SocketChannel>() {
     @Override
     public void initChannel(SocketChannel ch) throws Exception {
         ch.pipeline().addLast(new RedisDecoder(), new RedisEncoder(), new RedisClientHandler());
     }
 });
ChannelFuture f = b.connect("localhost", 6379).sync();
f.channel().closeFuture().sync();

2. 使用Java NIO实现Redis IO多路复用

Selector selector = Selector.open();
SocketChannel channel = SocketChannel.open();
channel.configureBlocking(false);
channel.register(selector, SelectionKey.OP_READ);
while (true) {
    selector.select();
    Set<SelectionKey> selectedKeys = selector.selectedKeys();
    Iterator<SelectionKey> iter = selectedKeys.iterator();
    while (iter.hasNext()) {
        SelectionKey key = iter.next();
        if (key.isReadable()) {
            // read from socket
        } else if (key.isWritable()) {
            // write to socket
        }
        iter.remove();
    }
}

3. 使用Java Socket实现Redis IO多路复用

Socket socket = new Socket("localhost", 6379);
InputStream in = socket.getInputStream();
OutputStream out = socket.getOutputStream();
while (true) {
    if (in.available() > 0) {
        // read from socket
    } else {
        // write to socket
    }
}