SpringBoot 整合 Netty 实现 WebSocket

    io.netty
    netty-all
    4.1.50.Final

package com.wangjing.socket.server;

import com.wangjing.socket.handler.CoordinationSocketHandler;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
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.codec.http.websocketx.WebSocketServerProtocolHandler;
import io.netty.handler.stream.ChunkedWriteHandler;

public class CoordinationNettyServer {

    private final int port;

    public CoordinationNettyServer(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() { // 绑定客户端连接时候触发操作
                        @Override
                        protected void initChannel(SocketChannel ch) throws Exception {
                            //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 WebSocketServerProtocolHandler("/ws", "WebSocket", true, 65536 * 10));
                            ch.pipeline().addLast(new CoordinationSocketHandler());//自定义消息处理类
                        }
                    });
            ChannelFuture cf = sb.bind().sync(); // 服务器异步创建绑定
            System.out.println(CoordinationNettyServer.class + "已启动，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();
        }
    }
}

package com.wangjing.socket.handler;

import com.wangjing.socket.pool.CoordinationChannelHandlerPool;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;

public class CoordinationSocketHandler extends SimpleChannelInboundHandler {


    @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
        CoordinationChannelHandlerPool.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！");
        //从channelGroup通道组删除
        CoordinationChannelHandlerPool.channelGroup.remove(ctx.channel());
    }

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, TextWebSocketFrame msg) throws Exception {
        //接收的消息
        System.out.println(String.format("收到客户端%s的数据：%s", ctx.channel().id(), msg.text()));

        // 单独发消息
        // sendMessage(ctx);
        // 群发消息
        sendAllMessage();
    }

    private void sendMessage(ChannelHandlerContext ctx) throws InterruptedException {
        String message = "我是服务器，你好呀";
        ctx.writeAndFlush(new TextWebSocketFrame("hello"));
    }

    private void sendAllMessage() {
        String message = "我是服务器，这是群发消息";
        CoordinationChannelHandlerPool.channelGroup.writeAndFlush(new TextWebSocketFrame(message));
    }


}

package com.wangjing.socket.pool;

import io.netty.channel.group.ChannelGroup;
import io.netty.channel.group.DefaultChannelGroup;
import io.netty.util.concurrent.GlobalEventExecutor;

public class CoordinationChannelHandlerPool {

    public CoordinationChannelHandlerPool() {
    }

    //可以存储userId与ChannelId的映射表
//    public static ConcurrentHashMap channelIdMap = new ConcurrentHashMap<>();

    //channelGroup通道组
    public static ChannelGroup channelGroup = new DefaultChannelGroup(GlobalEventExecutor.INSTANCE);

}

package com.wangjing.socket;

import com.wangjing.socket.server.CoordinationNettyServer;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication(scanBasePackages = "com.wangjing")
public class SocketApplication {


    public static void main(String[] args) {
        SpringApplication.run(SocketApplication.class, args);

        try {
            new CoordinationNettyServer(8804).start();
        } catch (Exception e) {
            System.out.println("NettyServerError:" + e.getMessage());
        }
    }

}

websocket 在线测试推荐：在线websocket测试-online tool-postjson

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