第二課 Netty服務端

netty應用的領域

1分佈式進程通信
例如: hadoop、dubbo、akka等具有分佈式功能的框架,底層RPC通信都是基於netty實現的,這些框架使用的版本通常都還在用netty3.x

2、遊戲服務器開發
最新的遊戲服務器有部分公司可能已經開始採用netty4.x 或 netty5.x


代碼示例

public class Server {

    public static void main(String[] args) {
        ServerBootstrap serverBootstrap = new ServerBootstrap();

        ExecutorService boss = Executors.newCachedThreadPool();
        ExecutorService worker = Executors.newCachedThreadPool();
        //設置NioSocket工廠
        serverBootstrap.setFactory(new NioServerSocketChannelFactory(boss,worker));
        //設置管道工廠
        serverBootstrap.setPipelineFactory(new ChannelPipelineFactory() {

            @Override
            public ChannelPipeline getPipeline() throws Exception {
                //創建管道
                ChannelPipeline pipeline = Channels.pipeline();

                pipeline.addLast("decoder", new StringDecoder());
                pipeline.addLast("encoder", new StringEncoder());
                pipeline.addLast("ServerHandler", new ServerHandler());

                return pipeline;
            }
        });
        serverBootstrap.bind(new InetSocketAddress(8000));
        System.out.println("NIOServer started!!!!!!!!!!!");

    }
}
public class ServerHandler extends SimpleChannelHandler{

    @Override
    public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e)
            throws Exception {
        System.out.println("channelClosed");
        super.channelClosed(ctx, e);
    }

    @Override
    public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent event)
            throws Exception {
        System.out.println("channelConnected"+event.getChannel().getRemoteAddress());
        super.channelConnected(ctx, event);
    }

    @Override
    public void channelDisconnected(ChannelHandlerContext ctx,
            ChannelStateEvent e) throws Exception {
        System.out.println("channelDisconnected");
        super.channelDisconnected(ctx, e);
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e)
            throws Exception {
        System.out.println("exceptionCaught");
        super.exceptionCaught(ctx, e);
    }

    @Override
    public void messageReceived(ChannelHandlerContext context, MessageEvent message)
            throws Exception {

        String buffer = (String) message.getMessage();

        System.out.println("received message:"+buffer);

        ChannelBuffer buffer2 = ChannelBuffers.copiedBuffer("Hi".getBytes());
        context.getChannel().write(buffer2);
        super.messageReceived(context, message);
    }


}
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