netty006之使用netty实现websocket长连接

服务器：

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;

import java.net.InetSocketAddress;

/**
 * netty 实现websockt长连接
 */
public class MyServer {

    public static void main(String[] args) throws InterruptedException {
       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))
                    .childHandler(new WebSocketChannelInitializer());
            ChannelFuture channelFuture = serverBootstrap.bind(new InetSocketAddress(18899)).sync();
            channelFuture.channel().closeFuture().sync();
        } finally {
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }


    }
}

import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;
import io.netty.handler.stream.ChunkedWriteHandler;

public class WebSocketChannelInitializer extends ChannelInitializer {
    @Override
    protected void initChannel(SocketChannel socketChannel) throws Exception {
        ChannelPipeline pipeline = socketChannel.pipeline();

        pipeline.addLast(new HttpServerCodec());
        //块的方式去写
        pipeline.addLast(new ChunkedWriteHandler());
        pipeline.addLast(new HttpObjectAggregator(8899));
//        ws://localhost:8899/allen
        pipeline.addLast(new WebSocketServerProtocolHandler("/allen"));
        pipeline.addLast(new TextWebSocketFrameHandler());

    }
}

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;

import java.time.LocalDateTime;

public class TextWebSocketFrameHandler extends SimpleChannelInboundHandler {
    @Override
    protected void channelRead0(ChannelHandlerContext channelHandlerContext, TextWebSocketFrame textWebSocketFrame) throws Exception {
        System.out.println("收到消息：" + textWebSocketFrame.text());
        channelHandlerContext.writeAndFlush(new TextWebSocketFrame("服务器时间：" + LocalDateTime.now()));

    }

//    handlerAdded:005056fffec00001-00001ed0-00000004-0f3f1c7f08e0ac5b-e919e3f0
    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        super.handlerAdded(ctx);
        System.out.println("handlerAdded:" + ctx.channel().id().asLongText());
    }

    @Override
    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
        super.handlerRemoved(ctx);
        System.out.println("handlerRemoved:" + ctx.channel().id().asLongText());
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        System.out.println("异常发生");
        super.exceptionCaught(ctx, cause);
    }
}

客户端：web形式的（原生javascript）

//页面刷新，websockt长连接就会锻炼

    
    



 

     
     
     

     
服务器输出：
     
     

 

 

测试；