Netty5 简单栗子

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() {
                        @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!");
    }
}