netty 多端口

Netty可以支持多端口监听，可以通过创建多个ServerBootstrap实例，每个实例监听一个端口。以下是一个简单的示例代码：

EventLoopGroup bossGroup = new NioEventLoopGroup();
EventLoopGroup workerGroup = new NioEventLoopGroup();

try {
    ServerBootstrap bootstrap1 = new ServerBootstrap();
    bootstrap1.group(bossGroup, workerGroup)
             .channel(NioServerSocketChannel.class)
             .localAddress(new InetSocketAddress(port1))
             .childHandler(new ChannelInitializer<SocketChannel>() {
                 @Override
                 public void initChannel(SocketChannel ch) throws Exception {
                     ch.pipeline().addLast(new MyServerHandler());
                 }
             });

    ServerBootstrap bootstrap2 = new ServerBootstrap();
    bootstrap2.group(bossGroup, workerGroup)
             .channel(NioServerSocketChannel.class)
             .localAddress(new InetSocketAddress(port2))
             .childHandler(new ChannelInitializer<SocketChannel>() {
                 @Override
                 public void initChannel(SocketChannel ch) throws Exception {
                     ch.pipeline().addLast(new MyServerHandler());
                 }
             });

    ChannelFuture future1 = bootstrap1.bind().sync();
    System.out.println("Server started and listening on " + future1.channel().localAddress());

    ChannelFuture future2 = bootstrap2.bind().sync();
    System.out.println("Server started and listening on " + future2.channel().localAddress());

    future1.channel().closeFuture().sync();
    future2.channel().closeFuture().sync();
} finally {
    bossGroup.shutdownGracefully();
    workerGroup.shutdownGracefully();
}

在这个示例中，我们创建了两个ServerBootstrap实例，分别监听端口port1和port2。每个实例都配置了一个处理器MyServerHandler，用于处理接收到的消息。最后，我们启动服务器并等待关闭。