Netty5 简单栗子

mark一个Netty5 简化版的栗子~，比较简单不用多说，直接上代码…

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Server:

public class Server {    public void init() throws Exception {        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(9999).sync();            System.out.println("NettyServer start up.");            channelFuture.channel().closeFuture().sync();        } finally {            bossGroup.shutdownGracefully();            workerGroup.shutdownGracefully();        }    }    private class ChildChannelHandler extends ChannelInitializer<SocketChannel> {        @Override        protected void initChannel(SocketChannel socketChannel) throws Exception {            socketChannel.pipeline().addLast(new ServerHandler());        }    }    public static void main(String[] args) throws Exception {        Server server = new Server();        server.init();    }}

ServerHandler:

public class ServerHandler extends ChannelHandlerAdapter {    @Override    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {        ByteBuf byteBuf = (ByteBuf) msg;        byte[] bytes = new byte[byteBuf.readableBytes()];        byteBuf.readBytes(bytes);        String recmMsg = new String(bytes, "UTF-8");        System.out.println("Server receive : " + recmMsg);        String resp = "This msg is from server: has Receive msg!";        ctx.write(Unpooled.copiedBuffer(resp.getBytes()));    }    @Override    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {        ctx.flush();    }    @Override    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {        ctx.close();    }}

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Client:

public class Client {    public void connect() throws Exception {        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 channel) throws Exception {                            channel.pipeline().addLast(new ClientHandler());                        }                    });            ChannelFuture channelFuture = bootstrap.connect("127.0.0.1", 9999).sync();            channelFuture.channel().closeFuture().sync();        } finally {            group.shutdownGracefully();        }    }    public static void main(String[] args) throws Exception {        Client client = new Client();        client.connect();    }}

ClientHandler:

public class ClientHandler extends ChannelHandlerAdapter {    private final ByteBuf msgBuf;    public ClientHandler() {        byte[] bytes = "Hi, this msg is from client.".getBytes();        this.msgBuf = Unpooled.buffer(bytes.length);        this.msgBuf.writeBytes(bytes);    }    @Override    public void channelActive(ChannelHandlerContext ctx) throws Exception {        ctx.writeAndFlush(msgBuf);    }    @Override    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {        ByteBuf byteBuf = (ByteBuf) msg;        byte[] bytes = new byte[byteBuf.readableBytes()];        byteBuf.readBytes(bytes);        String respMsg = new String(bytes, "UTF-8");        System.out.println("Client receive : " + respMsg);    }    @Override    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {        System.out.println("Exception occurred!");    }}