笔记补充Netty-helloworld

1、服务端
//1 创建2个线程，一个是负责接收客户端的连接。一个是负责进行数据传输的
EventLoopGroup pGroup = new NioEventLoopGroup();
EventLoopGroup cGroup = new NioEventLoopGroup();
//2 创建服务器辅助类
ServerBootstrap b = new ServerBootstrap();
b.group(pGroup, cGroup)
 .channel(NioServerSocketChannel.class)
 .option(ChannelOption.SO_BACKLOG, 1024)
 .option(ChannelOption.SO_SNDBUF, 32*1024)
 .option(ChannelOption.SO_RCVBUF, 32*1024)
 .childHandler(new ChannelInitializer<SocketChannel>() {
   @Override
   protected void initChannel(SocketChannel sc) throws Exception {
      //设置特殊分隔符
      ByteBuf buf = Unpooled.copiedBuffer("$_".getBytes());//设置分隔符
      sc.pipeline().addLast(new DelimiterBasedFrameDecoder(1024, buf));
      sc.pipeline().addLast(new StringDecoder());//设置字符串形式的解码
      sc.pipeline().addLast(new ServerHandler());//添加自己的逻辑需要实现ChannelHandlerAdapter
    }
});
//4 绑定连接
ChannelFuture cf = b.bind(8765).sync();
//等待服务器监听端口关闭
cf.channel().closeFuture().sync();
pGroup.shutdownGracefully();
cGroup.shutdownGracefully();

2、客户端：
EventLoopGroup group = new NioEventLoopGroup();
Bootstrap b = new Bootstrap();
b.group(group)
 .channel(NioSocketChannel.class)
 .handler(new ChannelInitializer<SocketChannel>() {
   @Override
   protected void initChannel(SocketChannel sc) throws Exception {
      //
      ByteBuf buf = Unpooled.copiedBuffer("$_".getBytes());
      sc.pipeline().addLast(new DelimiterBasedFrameDecoder(1024, buf));
      sc.pipeline().addLast(new StringDecoder());
      sc.pipeline().addLast(new ClientHandler());//添加自己的逻辑实现ChannelHandlerAdapter
   }
});
ChannelFuture cf = b.connect("127.0.0.1", 8765).sync();
cf.channel().writeAndFlush(Unpooled.wrappedBuffer("bbbb$_aaaaa$_".getBytes()));
cf.channel().writeAndFlush(Unpooled.wrappedBuffer("cccc$_".getBytes()));
//等待客户端端口关闭
cf.channel().closeFuture().sync();
group.shutdownGracefully();