1、在application中初始化netty服务器

public static void main(String[] args) {
    SpringApplication.run(PartialPressureApplication.class, args);
    try {
        new NettyServer(12345).start();
        System.out.println("https://blog.csdn.net/moshowgame");
        System.out.println("http://127.0.0.1:6688/netty-websocket/index");
    }catch(Exception e) {
        System.out.println("NettyServerError:"+e.getMessage());
    }

}
创建NettyServer类

public class NettyServer {
    private final int port;

    public NettyServer(int port) {
        this.port = port;
    }

    public void start() throws Exception {
        EventLoopGroup bossGroup = new NioEventLoopGroup();

        EventLoopGroup group = new NioEventLoopGroup();
        try {
            ServerBootstrap sb = new ServerBootstrap();
            sb.option(ChannelOption.SO_BACKLOG, 1024);
            sb.group(group, bossGroup) // 绑定线程池
                    .channel(NioServerSocketChannel.class) // 指定使用的channel
                    .localAddress(this.port)// 绑定监听端口
                    .childHandler(new ChannelInitializer<SocketChannel>() { // 绑定客户端连接时候触发操作

                        @Override
                        protected void initChannel(SocketChannel ch) throws Exception {
                            System.out.println("收到新连接");
                            //websocket协议本身是基于http协议的，所以这边也要使用http解编码器
                            ch.pipeline().addLast(new HttpServerCodec());
                            //以块的方式来写的处理器
                            ch.pipeline().addLast(new ChunkedWriteHandler());
                            ch.pipeline().addLast(new HttpObjectAggregator(8192));
                            ch.pipeline().addLast(new MyWebSocketHandler());
                            ch.pipeline().addLast(new WebSocketServerProtocolHandler("/ws", null, true, 65536 * 10));
                        }
                    });
            ChannelFuture cf = sb.bind().sync(); // 服务器异步创建绑定
            System.out.println(NettyServer.class + " 启动正在监听： " + cf.channel().localAddress());
            cf.channel().closeFuture().sync(); // 关闭服务器通道
        } finally {
            group.shutdownGracefully().sync(); // 释放线程池资源
            bossGroup.shutdownGracefully().sync();
        }
    }
}

创建管理池

/**
 * MyChannelHandlerPool
 * 通道组池，管理所有websocket连接
 * @author zhengkai.blog.csdn.net
 * @date 2019-06-12
 */
public class MyChannelHandlerPool {

    public MyChannelHandlerPool(){}

    public static ChannelGroup channelGroup = new DefaultChannelGroup(GlobalEventExecutor.INSTANCE);
}

创建handler处理类

public class MyWebSocketHandler extends SimpleChannelInboundHandler<TextWebSocketFrame> {

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        System.out.println("与客户端建立连接，通道开启！");

        //添加到channelGroup通道组
        MyChannelHandlerPool.channelGroup.add(ctx.channel());
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        System.out.println("与客户端断开连接，通道关闭！");
        //添加到channelGroup 通道组
        MyChannelHandlerPool.channelGroup.remove(ctx.channel());
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        //首次连接是FullHttpRequest，处理参数 by zhengkai.blog.csdn.net
        if (null != msg && msg instanceof FullHttpRequest) {
            FullHttpRequest request = (FullHttpRequest) msg;
            String uri = request.uri();

            Map paramMap = getUrlParams(uri);
            System.out.println("接收到的参数是：" + JSON.toJSONString(paramMap));
            ctx.writeAndFlush(new TextWebSocketFrame("server:"+JSON.toJSONString(paramMap)));
            //如果url包含参数，需要处理
            if (uri.contains("?")) {
                String newUri = uri.substring(0, uri.indexOf("?"));
                System.out.println(newUri);
                request.setUri(newUri);
            }

        } else if (msg instanceof TextWebSocketFrame) {
            //正常的TEXT消息类型
            TextWebSocketFrame frame = (TextWebSocketFrame) msg;
            System.out.println("客户端收到服务器数据：" + frame.text());
            sendAllMessage(frame.text());
            ctx.writeAndFlush(new TextWebSocketFrame("server:"+frame.text()));
        }
        super.channelRead(ctx, msg);
    }

    @Override
    protected void channelRead0(ChannelHandlerContext channelHandlerContext, TextWebSocketFrame textWebSocketFrame) throws Exception {

    }

    private void sendAllMessage(String message) {
        //收到信息后，群发给所有channel
        MyChannelHandlerPool.channelGroup.writeAndFlush(new TextWebSocketFrame(message));
    }

    private static Map getUrlParams(String url) {
        Map<String, String> map = new HashMap<>();
        url = url.replace("?", ";");
        if (!url.contains(";")) {
            return map;
        }
        if (url.split(";").length > 0) {
            String[] arr = url.split(";")[1].split("&");
            for (String s : arr) {
                String key = s.split("=")[0];
                String value = s.split("=")[1];
                map.put(key, value);
            }
            return map;

        } else {
            return map;
        }
    }
}


###################################################################################################################
前端socket.html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Netty-Websocket</title>
<script type="text/javascript">
// by zhengkai.blog.csdn.net
var socket;
if(!window.WebSocket){
window.WebSocket = window.MozWebSocket;
}
if(window.WebSocket){
socket = new WebSocket("ws://127.0.0.1:12345/ws?uid=666&gid=777");
socket.onmessage = function(event){
var ta = document.getElementById(‘responseText‘);
ta.value += event.data+"\r\n";
};
socket.onopen = function(event){
var ta = document.getElementById(‘responseText‘);
ta.value += event.data+"\r\n";
ta.value = "Netty-WebSocket服务器。。。。。。连接 \r\n";
};
socket.onclose = function(event){
var ta = document.getElementById(‘responseText‘);
ta.value = "Netty-WebSocket服务器。。。。。。关闭 \r\n";
};
}else{
alert("您的浏览器不支持WebSocket协议！");
}
function send(message){
if(!window.WebSocket){return;}
if(socket.readyState == WebSocket.OPEN){
socket.send(message);
}else{
alert("WebSocket 连接没有建立成功！");
}

}

</script>
</head>
<body>
<form onSubmit="return false;">
<label>ID</label><input type="text" name="uid" value="${uid!!}" /> <br />
<label>TEXT</label><input type="text" name="message" value="这里输入消息" /> <br />
<br /> <input type="button" value="发送ws消息"
onClick="send(this.form.uid.value+‘:‘+this.form.message.value)" />
<hr color="black" />
<h3>服务端返回的应答消息</h3>
<textarea id="responseText" style="width: 1024px;height: 300px;"></textarea>
</form>
</body>
</html>

vue+SSM+Netty实现ws通信