Netty心跳檢測

服務端：

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();
        }

    }
}

服務端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 = "讀寫空閒";
                    break;
                case READER_IDLE:
                    eventType = "讀空閒";
                    break;
                case WRITER_IDLE:
                    eventType = "寫空閒";
                    break;
            }
            System.out.println(ctx.channel().remoteAddress() + "--" + eventType);
        }
    }
}

Github https://github.com/WillLiaowh/nettyDemo