JAVA(7)-netty-client

客户端也就4步,上代码
 

 public  void client() throws Exception {
        //1.创建管道和管理
        EventLoopGroup workerGroup =new NioEventLoopGroup(1);
        Bootstrap b=new Bootstrap();
        b.group(workerGroup);
        //2.设置类型
        b.channel(NioSocketChannel.class);

        //3.管道建立好了，初始化
        b.handler(new ChannelInitializer<SocketChannel>(){
            @Override
            protected void initChannel(SocketChannel socketChannel) throws Exception {
                channel=socketChannel;
                socketChannel.pipeline().addLast(new MyHandler());
            }
        });
        ChannelFuture future= b.connect("localhost",8888).sync();
        //等待关闭
        future.channel().closeFuture().sync();
        System.out.println("go on");
        workerGroup.shutdownGracefully();
    }

myhandler 用来处理读写
 

static  class MyHandler extends ChannelInboundHandlerAdapter
    {
        //1.读
        @Override
        public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
            //2.Object msg->String str
            //readableBytes()长度，readerIndex()起始位置
            ByteBuf buf=null;
            try {
                buf = (ByteBuf) msg;
                byte[] bytes = new byte[buf.readableBytes()];//
                buf.getBytes(buf.readerIndex(), bytes);
                String str = new String(bytes);
                ClientFrame.INSTANCE.updateText(str);
            }finally //任何情况都要释放
            {
                if(buf!=null)
               ReferenceCountUtil.release(buf);
            }
        }

        //异常
        @Override
        public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
            super.exceptionCaught(ctx, cause);
        }
    }