关于netty:Netty心跳检测

服务端：

package HeatBeat;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.logging.LoggingHandler;
import io.netty.handler.timeout.IdleStateHandler;

import java.util.concurrent.TimeUnit;

public class MyServer {public static void main(String[] args) throws InterruptedException {NioEventLoopGroup bossGroup = new NioEventLoopGroup(1);
        NioEventLoopGroup workGroup = new NioEventLoopGroup();
        try{ServerBootstrap serverBootstrap = new ServerBootstrap();
            serverBootstrap.group(bossGroup,workGroup)
                    .channel(NioServerSocketChannel.class)
                    .handler(new LoggingHandler())
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel socketChannel) throws Exception {ChannelPipeline pipeline = socketChannel.pipeline();
                            pipeline.addLast(new IdleStateHandler(3,5,7, TimeUnit.SECONDS));
                            pipeline.addLast(new MyServerHandler());
                        }
                    });

            ChannelFuture channelFuture = serverBootstrap.bind(7000).sync();
            channelFuture.channel().closeFuture().sync();}finally{bossGroup.shutdownGracefully();
            workGroup.shutdownGracefully();}

    }
} 

服务端 handler：

package HeatBeat;

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.handler.timeout.IdleStateEvent;

public class MyServerHandler 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 ALL_IDLE:
                    eventType = "读写闲暇";
                    break;
                case READER_IDLE:
                    eventType = "读闲暇";
                    break;
                case WRITER_IDLE:
                    eventType = "写闲暇";
                    break;
            }
            System.out.println(ctx.channel().remoteAddress() + "--" + eventType);
        }