### NettyServer開發示例 ``` import io.netty.bootstrap.ServerBootstrap; import io.netty.channel.*; import io.netty.channel.nio.NioEventLoopGroup; import io.netty.channel.socket.nio.NioServerSocketChannel; /** * @program: learn * @author: Robert * @create: 2018-06-28 **/ public class NettyServer { public void bind(int port) { EventLoopGroup bossGroup = new NioEventLoopGroup(); EventLoopGroup workerGroup = new NioEventLoopGroup(); try { ServerBootstrap bootstrap = new ServerBootstrap(); bootstrap.group(bossGroup, workerGroup) .channel(NioServerSocketChannel.class) .option(ChannelOption.SO_BACKLOG, 1024) .childHandler(new ChildChannelHandler()); ChannelFuture channelFuture = bootstrap.bind(port).sync(); channelFuture.channel().closeFuture().sync(); } catch (Exception e) { e.printStackTrace(); } finally { bossGroup.shutdownGracefully(); workerGroup.shutdownGracefully(); } } private class ChildChannelHandler extends ChannelInitializer { @Override protected void initChannel(Channel channel) throws Exception { channel.pipeline().addLast(new ServerChannelHandler()); } } public static void main(String[] args) { new NettyServer().bind(8089); } } import io.netty.buffer.ByteBuf; import io.netty.buffer.Unpooled; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.ChannelInboundHandlerAdapter; import java.time.LocalDateTime; /** * @program: learn * @author: Robert * @create: 2018-06-28 **/ public class ServerChannelHandler extends ChannelInboundHandlerAdapter { @Override public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception { ReadHandler.read(msg); String now = LocalDateTime.now().toString(); ByteBuf buffer = Unpooled.copiedBuffer(now.getBytes()); ctx.write(buffer); } @Override public void channelReadComplete(ChannelHandlerContext ctx) throws Exception { ctx.flush(); } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception { ctx.close(); } } ```  ### NettyClient ``` import io.netty.bootstrap.Bootstrap; import io.netty.channel.ChannelFuture; import io.netty.channel.ChannelInitializer; import io.netty.channel.ChannelOption; import io.netty.channel.EventLoopGroup; import io.netty.channel.nio.NioEventLoopGroup; import io.netty.channel.socket.SocketChannel; import io.netty.channel.socket.nio.NioSocketChannel; /** * @program: learn * @author: Robert * @create: 2018-06-28 **/ public class NettyClient { public void connect(String host, int port) { EventLoopGroup group = new NioEventLoopGroup(); try { Bootstrap bootstrap = new Bootstrap(); bootstrap.group(group) .channel(NioSocketChannel.class) .option(ChannelOption.TCP_NODELAY, true) .handler(new ChannelInitializer<SocketChannel>() { @Override protected void initChannel(SocketChannel socketChannel) throws Exception { socketChannel.pipeline().addLast(new ClientChannelHandler()); } }); ChannelFuture future = bootstrap.connect(host, port).sync(); future.channel().closeFuture().sync(); } catch (Exception e) { e.printStackTrace(); } finally { group.shutdownGracefully(); } } public static void main(String[] args) { new NettyClient().connect("localhost", 8089); } } import io.netty.buffer.ByteBuf; import io.netty.buffer.Unpooled; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.ChannelInboundHandlerAdapter; /** * @program: learn * @author: Robert * @create: 2018-06-28 **/ public class ClientChannelHandler extends ChannelInboundHandlerAdapter { private ByteBuf message; public ClientChannelHandler() { byte[] bytes = "hello,world".getBytes(); message = Unpooled.buffer(bytes.length); message.writeBytes(bytes); } @Override public void channelActive(ChannelHandlerContext ctx) throws Exception { ctx.writeAndFlush(message); } @Override public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception { System.err.println("read response"); ReadHandler.read(msg); } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception { ctx.close(); } } ```