Netty 的网络通信 demo

1、引入 jar 包

     io.netty
     netty-all
     4.1.6.Final

2、Netty 服务端

public class NettyServer {
    public static void main(String[] args) throws InterruptedException {
        //1、创建两个线程池对象
        // bossGroup 负责接收用户连接
        NioEventLoopGroup bossGroup = new NioEventLoopGroup();
        // workGroup 负责接收用户的 io读写操作
        NioEventLoopGroup workGroup = new NioEventLoopGroup();

        //2、创建启动引导类
        ServerBootstrap serverBootstrap = new ServerBootstrap();

        //3、设置启动引导类
        //添加到组中，两个线城池，第一个位置的线程池就负责接收，第二个参数就负责读写
        serverBootstrap.group(bossGroup,workGroup)
                //给我们当前设置一个通道类型
                .channel(NioServerSocketChannel.class)
                //绑定一个初始化监听
                .childHandler(new ChannelInitializer() {
                    @Override
                    protected void initChannel(NioSocketChannel nioSocketChannel) throws Exception {
                        //获取pipeLine
                        ChannelPipeline pipeline = nioSocketChannel.pipeline();
                        //绑定编码
                        pipeline.addFirst(new StringEncoder());
                        pipeline.addLast(new StringDecoder());
                        //绑定我们的业务逻辑
                        pipeline.addLast(new SimpleChannelInboundHandler() {
                            @Override
                            protected void channelRead0(ChannelHandlerContext channelHandlerContext, String msg) throws Exception {
                                //获取入栈信息，打印客户端传递的数据
                                System.out.println(msg);
                            }
                        });
                    }
                });

        //4、启动引导类绑定端口
        ChannelFuture future = serverBootstrap.bind(9999).sync();
        //5、关闭通道
        future.channel().closeFuture();
    }
}

3、Netty 客户端

public class NettyClient {
    public static void main(String[] args) throws InterruptedException {
        //1、创建连接池对象
        NioEventLoopGroup group = new NioEventLoopGroup();
        //2、创建客户端的启动引导类 Bootstrap
        Bootstrap bootstrap = new Bootstrap();
        //3、配置启动引导类
        bootstrap.group(group)
                //设置通道为nio
                .channel(NioSocketChannel.class)
                //设置Channel初始化监听
                .handler(new ChannelInitializer() {
                    //当前该方法监听channel是否初始化
                    @Override
                    protected void initChannel(Channel channel) throws Exception {
                        //设置编码
                        channel.pipeline().addFirst(new StringEncoder());
                    }
                });

        //4、使用启动引导类连接服务器，获取一个 channel
        Channel channel = bootstrap.connect("127.0.0.1", 9999).channel();
        //5、循环写数据给服务器
        while (true){
            channel.writeAndFlush("hello server... this is client ..");
            Thread.sleep(2000);
        }
    }
}