Netty学习——实战篇5 Netty 心跳监测/WebSocket长连接编程 备份

 1 心跳监测

MyServer.java

public class MyServer {
    public static void main(String[] args) {
        NioEventLoopGroup bossGroup = new NioEventLoopGroup(1);
        NioEventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap serverBootstrap = new ServerBootstrap();
            serverBootstrap.group(bossGroup,workerGroup)
                    .channel(NioServerSocketChannel.class)
                    .handler(new LoggingHandler(LogLevel.DEBUG))
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel ch) throws Exception {
                            ChannelPipeline pipeline = ch.pipeline();
                            //加入Netty提供的 IdleStateHandler
                            /*
                                说明：IdleStateHandler 是netty提供的处理空闲状态的处理器
                                    long readerIdleTime:表示多长时间没有读，就会发送一个心跳监测包 检测是否连接
                                    long writerIdelTime:表示多长时间没有写，就会发送一个心跳监测包 监测是否连接
                                    long allIdelTime:表示多长时间没有读写，就会发送一个心跳检测包 监测是否连接
                             */
                            pipeline.addLast(new IdleStateHandler(3,5,7, TimeUnit.SECONDS));
                            //加入自定义Handler，对空闲检测进一步处理
                            pipeline.addLast(new MyServerHandler());

                        }
                    });
            ChannelFuture channelFuture = serverBootstrap.bind(8000).sync();
            channelFuture.channel().closeFuture().sync();
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }

    }
}

MyServerHandler.java 

@Slf4j
public class MyServerHandler extends ChannelInboundHandlerAdapter {
    @Override
    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {
        if(evt instanceof IdleStateEvent){
            IdleStateEvent event = (I