client 关闭后会执行 finally 代码块，可以在这里可以进行重连操作
public class NettyClient implements Runnable { ???private final String host; ???private final int port; ???private final int reconnectSleepSeconds; ???public NettyClient(String host, int port, int reconnectSleepSeconds){ ???????this.host = host; ???????this.port = port; ???????this.reconnectSleepSeconds = reconnectSleepSeconds; ???} ???@Override ???public void run() { ???????connect(); ???} ???private void connect(){ ???????EventLoopGroup workerGroup = new NioEventLoopGroup(); ???????try { ???????????Bootstrap b = new Bootstrap(); ???????????b.group(workerGroup); ???????????b.channel(NioSocketChannel.class); ???????????b.option(ChannelOption.SO_KEEPALIVE, true); ???????????b.handler(new ChannelInitializer<SocketChannel>() { ???????????????@Override ???????????????public void initChannel(SocketChannel ch) throws Exception { ???????????????????// TODO: 添加 Handler ???????????????} ???????????}); ???????????ChannelFuture f = b.connect(host, port).sync(); ???????????f.channel().closeFuture().sync(); ???????} catch (Exception e){ ???????????e.printStackTrace(); ???????} finally { ???????????workerGroup.shutdownGracefully(); ???????????try { ???????????????TimeUnit.SECONDS.sleep(reconnectSleepSeconds); ???????????????connect(); // 断线重连 ???????????} catch (InterruptedException e) { ???????????????e.printStackTrace(); ???????????} ???????} ???}}参考：微言netty：不在浮沙筑高台
Netty 客户端断线重连
原文地址：https://www.cnblogs.com/victorbu/p/10789527.html