Bootstrap

Netty框架：java实现websocket，向网页实时推送消息 

package com.cetcnav.nioWebSocket;

import com.cetcnav.base.utils.PropertiesUtils;

import cn.hutool.core.lang.Console;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import io.netty.handler.stream.ChunkedWriteHandler;

/**
 * @author wp
 * 2021年4月14日下午3:43:54
 * smartReceptionWS
 * NioWebSocketServer.java
 * 类说明：
 */


public class NioWebSocketServer implements Runnable {
	

	@Override
	public void run() {
		init();
	}
	
	/**
	 * niowebsocket端口号
	 */
	private final static Integer port = PropertiesUtils.getInteger("nio.wensocket.port");
	
	
    public void init(){
        Console.log("正在启动websocket服务器");
        NioEventLoopGroup boss=new NioEventLoopGroup();
        NioEventLoopGroup work=new NioEventLoopGroup();
        try {
            ServerBootstrap bootstrap=new ServerBootstrap();
            bootstrap.option(ChannelOption.SO_BACKLOG, 1024);// 防止tcp数据积攒大块发送；有数据了就发送
            bootstrap.childOption(ChannelOption.SO_KEEPALIVE,true);
            bootstrap.group(boss,work).localAddress(port);// 绑定监听端口;
            bootstrap.channel(NioServerSocketChannel.class);
            bootstrap.childHandler(new NioWebSocketChannelInitializer());
            // 服务器异步创建绑定
            Channel channel = bootstrap.bind().sync().channel();
            Console.log("webSocket服务器启动成功："+channel);
            //关闭服务器通道
            channel.closeFuture().sync();
        } catch (InterruptedException e) {
            e.printStackTrace();
            Console.error("运行出错："+e);
        }finally {
            boss.shutdownGracefully();
            work.shutdownGracefully();
            Console.log("websocket服务器已关闭");
        }
    }

    public static void main(String[] args) {
        new NioWebSocketServer().init();
    }

}


package com.cetcnav.nioWebSocket;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.*;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.FullHttpRequest;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.handler.codec.http.HttpVersion;
import io.netty.handler.codec.http.websocketx.*;
import io.netty.util.CharsetUtil;

import java.util.Date;

import cn.hutool.core.lang.Console;

/**
 * @author wp
 * 2021年4月14日下午3:49:10
 * smartReceptionWS
 * NioWebSocketHandler.java
 * 类说明：
 */


import static io.netty.handler.codec.http.HttpUtil.isKeepAlive;

/**
 * @author wp
 * 2021年4月15日下午3:43:31
 * smartReceptionWS
 * NioWebSocketHandler.java
 * 类说明：
 */
public class NioWebSocketHandler extends SimpleChannelInboundHandler<Object> {
	
    private WebSocketServerHandshaker handshaker;

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, Object msg) throws Exception {
        Console.log("收到消息："+msg);
        if (msg instanceof FullHttpRequest){
            //以http请求形式接入，但是走的是websocket
            handleHttpRequest(ctx, (FullHttpRequest) msg);
        }else if (msg instanceof  WebSocketFrame){
            //处理websocket客户端的消息
            handlerWebSocketFrame(ctx, (WebSocketFrame) msg);
        }
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        //添加连接
        Console.log("客户端加入连接："+ctx.channel());
        ChannelHandlerPool.addChannel(ctx.channel());
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        //断开连接
        Console.log("客户端断开连接："+ctx.channel());
        ChannelHandlerPool.removeChannel(ctx.channel());
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
        ctx.flush();
    }
    private void handlerWebSocketFrame(ChannelHandlerContext ctx, WebSocketFrame frame){
        // 判断是否关闭链路的指令
        if (frame instanceof CloseWebSocketFrame) {
            handshaker.close(ctx.channel(), (CloseWebSocketFrame) frame.retain());
            return;
        }
        // 判断是否ping消息
        if (frame instanceof PingWebSocketFrame) {
            ctx.channel().write(
                    new PongWebSocketFrame(frame.content().retain()));
            return;
        }
        // 本例程仅支持文本消息，不支持二进制消息
        if (!(frame instanceof TextWebSocketFrame)) {
            Console.log("本例程仅支持文本消息，不支持二进制消息");
            throw new UnsupportedOperationException(String.format(
                    "%s frame types not supported", frame.getClass().getName()));
        }
        // 返回应答消息
        String request = ((TextWebSocketFrame) frame).text();
        Console.log("服务端收到：" + request);
        TextWebSocketFrame tws = new TextWebSocketFrame(new Date().toString()
                + ctx.channel().id() + "：" + request);
        // 群发
//        ChannelHandlerPool.send2All(tws);
        // 返回【谁发的发给谁】
         ctx.channel().writeAndFlush(tws);
    }
    /**
     * 唯一的一次http请求，用于创建websocket
     */
    private void handleHttpRequest(ChannelHandlerContext ctx,FullHttpRequest req) {
        //要求Upgrade为websocket，过滤掉get/Post
        if (!req.decoderResult().isSuccess() || (!"websocket".equals(req.headers().get("Upgrade")))) {
            //若不是websocket方式，则创建BAD_REQUEST的req，返回给客户端
            sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.BAD_REQUEST));
            return;
        }
        WebSocketServerHandshakerFactory wsFactory = new WebSocketServerHandshakerFactory("", null, false);
        handshaker = wsFactory.newHandshaker(req);
        if (handshaker == null) {
        	//版本不支持
            WebSocketServerHandshakerFactory.sendUnsupportedVersionResponse(ctx.channel());
        } else {
            handshaker.handshake(ctx.channel(), req);
        }
    }
	
	/**
     * 拒绝不合法的请求，并返回错误信息
     * */
    private static void sendHttpResponse(ChannelHandlerContext ctx,
                                         FullHttpRequest req, DefaultFullHttpResponse res) {
        // 返回应答给客户端
        if (res.status().code() != 200) {
            ByteBuf buf = Unpooled.copiedBuffer(res.status().toString(),
                    CharsetUtil.UTF_8);
            res.content().writeBytes(buf);
            buf.release();
        }
        ChannelFuture f = ctx.channel().writeAndFlush(res);
        // 如果是非Keep-Alive，关闭连接
        if (!isKeepAlive(req) || res.status().code() != 200) {
            f.addListener(ChannelFutureListener.CLOSE);
        }
    }
    
}

package com.cetcnav.nioWebSocket;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelId;
import io.netty.channel.group.ChannelGroup;
import io.netty.channel.group.DefaultChannelGroup;
import io.netty.handler.codec.http.websocketx.BinaryWebSocketFrame;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import io.netty.util.AttributeKey;
import io.netty.util.concurrent.GlobalEventExecutor;

import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.stream.Collectors;

/**
 * @author wp
 * 2021年4月14日下午3:50:52
 * smartReceptionWS
 * ChannelHandlerPool.java
 * 类说明：通道组池，管理所有websocket连接
 */
public class ChannelHandlerPool {
	
	private static ChannelGroup group = new DefaultChannelGroup(GlobalEventExecutor.INSTANCE);
	/**
	 * 
	 */
	private static ConcurrentMap<String, ChannelId> ChannelMap=new ConcurrentHashMap<String, ChannelId>();
	/**
	 * 通道组池，管理所有websocket连接   含有具体的指定用户名称
	 */
	public static Set<Channel> channelGroup = Collections.synchronizedSet(new HashSet<>());
    
    public  static void addChannel(Channel channel){
    	group.add(channel);
        ChannelMap.put(channel.id().asShortText(),channel.id());
    }
    public static void removeChannel(Channel channel){
    	group.remove(channel);
        ChannelMap.remove(channel.id().asShortText());
        
        /**
         * 去除指定用户名称通道
         */
        String channelId = channel.id().asShortText();
    	Iterator<Channel> it = channelGroup.iterator();
    	while(it.hasNext()){
    		Channel data = it.next();
    		String removeString = data.id().asShortText();
    		if (channelId.equals(removeString)){
    			it.remove();
    		}
    	}
        
    }
    public static  Channel findChannel(String id){
        return group.find(ChannelMap.get(id));
    }
    public static void send2All(TextWebSocketFrame tws){
    	group.writeAndFlush(tws);
    }
	
	
	
    
    
    
    
    
    public static String sendMessage(String parkId, String message){
    	List<Channel> channelList = getChannelByName(parkId);
		if (channelList.size() <= 0) {
			return "parkId" + parkId + "不在线！";
		}
		
		ByteBuf byteBuf = Unpooled.copiedBuffer(message.getBytes());
		
//		channelList.forEach(channel -> channel.writeAndFlush(new BinaryWebSocketFrame(byteBuf)));
		channelList.forEach(channel -> channel.writeAndFlush(new TextWebSocketFrame(message)));
		return "success";
    }
    
    
    /**
	 * 根据用户parkId查找channel
	 * 
	 * @param parkId
	 * @return
	 */
	public static List<Channel> getChannelByName(String parkId) {
		AttributeKey<String> key = AttributeKey.valueOf("parkId");
		return ChannelHandlerPool.channelGroup.stream().filter(channel -> channel.attr(key).get().equals(parkId))
				.collect(Collectors.toList());
	}
	
}


package com.cetcnav.worker;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.cetcnav.cacheManage.MessageCahce;
import com.cetcnav.nioWebSocket.ChannelHandlerPool;

import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;

/**
 * @author wp
 * @date 2021年6月3日下午8:11:47
 * @projectName GRWebSocket
 * @fileName SendMessage2WebWorker.java
 * @tags 类说明： 主动向前端推送解析之后的数据信息 
 */
public class SendMessage2WebWorker implements Runnable {
	private static Logger log = LoggerFactory.getLogger(SendMessage2WebWorker.class);


	@Override
	public void run() {
		while (true) {
			String json = MessageCahce.take();
			log.info(json);
			ChannelHandlerPool.send2All(new TextWebSocketFrame(json));
			if (json.contains("0060")){
				log.info("已推送干扰数据：");
			}
			else if(json.contains("0061")){
				log.info("已推送功放数据：");
			}
		}
	}

}


<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Netty-Websocket</title>
</head>
<script src="webjars/jquery/3.4.1/jquery.js"></script>
<script type="text/javascript">
    var socket;
    if (!window.WebSocket) {
        window.WebSocket = window.MozWebSocket;
    }
    if (window.WebSocket) {
    	// uid字段要和后台WebSocketHandler类中的paramMap.get("uid")字段对应
        socket = new WebSocket("ws://222.222.216.210:7777/websocket"); // 55代表用户id
        socket.onmessage = function (event) {
            //$("#websocket").html(event.data)
            console.log(event.data)
        };
        socket.onopen = function (event) {
            console.log("Netty-WebSocket服务器。。。。。。连接")
        };
        socket.onclose = function (event) {
            console.log("Netty-WebSocket服务器。。。。。。关闭")
        };
		
    } else {
        alert("您的浏览器不支持WebSocket协议！");
    }
</script>
<body>
    <div id="ws" class="ws">

    </div>
</body>
</html>

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道可道，非常道；名可名，非常名。 无名，天地之始，有名，万物之母。 故常无欲，以观其妙，常有欲，以观其徼。 此两者，同出而异名，同谓之玄，玄之又玄，众妙之门。

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