Netty 读写检测机制（心跳）

一、创建服务端

1、MyServer 类

public class MyServer {

    public static void main(String[] args) throws  Exception{

        EventLoopGroup bossGroup = new NioEventLoopGroup();

        EventLoopGroup workerGroup = new NioEventLoopGroup();

        try{

            ServerBootstrap serverBootstrap = new ServerBootstrap();

            serverBootstrap.group(bossGroup,workerGroup).channel(NioServerSocketChannel.class)

                    .handler(new LoggingHandler(LogLevel.INFO)) //增加日志处理器

                    .childHandler(new MyServerInitializer());

            ChannelFuture channelFuture = serverBootstrap.bind(8899).sync();

            channelFuture.channel().closeFuture().sync();

        }finally {

            bossGroup.shutdownGracefully();

            workerGroup.shutdownGracefully();

        }

    }

}

　　增加日志处理器

2、MyServerInitializer

public class MyServerInitializer extends ChannelInitializer<SocketChannel>{

    protected void initChannel(SocketChannel socketChannel) throws Exception {

        ChannelPipeline pipeline = socketChannel.pipeline();

        pipeline.addLast(new IdleStateHandler(5, 7, 10, TimeUnit.SECONDS));

        pipeline.addLast(new MyServerHandle());

    }

}

　　5秒钟没有读事件

　　7秒钟没有写事件

　　10秒钟没有读写事件

3、处理器MyServerHandle

public class MyServerHandle extends ChannelInboundHandlerAdapter  {

    @Override

    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {

        if(evt instanceof IdleStateEvent){

            IdleStateEvent event = (IdleStateEvent)evt;

            String eventType = null;

            switch (event.state()){

                case READER_IDLE:

                    eventType = "读空闲";

                    break;

                case WRITER_IDLE:

                    eventType = "写空闲";

                    break;

                case ALL_IDLE:

                    eventType = "读写空闲";

                    break;

            }

            CommonUtil.println(ctx.channel().remoteAddress() + "超时事件: " + eventType);

            //关闭连接

            ctx.channel().close();

        }

    }

}