redis 协议

NioEventLoopGroup worker = new NioEventLoopGroup();
byte[] LINE = {13, 10};
try {
    Bootstrap bootstrap = new Bootstrap();
    bootstrap.channel(NioSocketChannel.class);
    bootstrap.group(worker);
    bootstrap.handler(new ChannelInitializer<SocketChannel>() {
        @Override
        protected void initChannel(SocketChannel ch) {
            ch.pipeline().addLast(new LoggingHandler());
            ch.pipeline().addLast(new ChannelInboundHandlerAdapter() {
                // 会在连接 channel 建立成功后，会触发 active 事件
                @Override
                public void channelActive(ChannelHandlerContext ctx) {
                    set(ctx);
                    get(ctx);
                }
                private void get(ChannelHandlerContext ctx) {
                    ByteBuf buf = ctx.alloc().buffer();
                    buf.writeBytes("*2".getBytes());
                    buf.writeBytes(LINE);
                    buf.writeBytes("$3".getBytes());
                    buf.writeBytes(LINE);
                    buf.writeBytes("get".getBytes());
                    buf.writeBytes(LINE);
                    buf.writeBytes("$3".getBytes());
                    buf.writeBytes(LINE);
                    buf.writeBytes("aaa".getBytes());
                    buf.writeBytes(LINE);
                    ctx.writeAndFlush(buf);
                }
                private void set(ChannelHandlerContext ctx) {
                    ByteBuf buf = ctx.alloc().buffer();
                    buf.writeBytes("*3".getBytes());
                    buf.writeBytes(LINE);
                    buf.writeBytes("$3".getBytes());
                    buf.writeBytes(LINE);
                    buf.writeBytes("set".getBytes());
                    buf.writeBytes(LINE);
                    buf.writeBytes("$3".getBytes());
                    buf.writeBytes(LINE);
                    buf.writeBytes("aaa".getBytes());
                    buf.writeBytes(LINE);
                    buf.writeBytes("$3".getBytes());
                    buf.writeBytes(LINE);
                    buf.writeBytes("bbb".getBytes());
                    buf.writeBytes(LINE);
                    ctx.writeAndFlush(buf);
                }
                @Override
                public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
                    ByteBuf buf = (ByteBuf) msg;
                    System.out.println(buf.toString(Charset.defaultCharset()));
                }
            });
        }
    });
    ChannelFuture channelFuture = bootstrap.connect("localhost", 6379).sync();
    channelFuture.channel().closeFuture().sync();
} catch (InterruptedException e) {
    log.error("client error", e);
} finally {
    worker.shutdownGracefully();
}