Spring Boot + Netty + WebSocket 实现消息推送

关于Netty

Netty 是一个利用 Java 的高级网络的能力，隐藏其背后的复杂性而提供一个易于使用的 API 的客户端/服务器框架。

2

Maven依赖

<dependencies>
 <!-- https://mvnrepository.com/artifact/io.netty/netty-all -->
 <dependency>
  <groupId>io.netty</groupId>
  <artifactId>netty-all</artifactId>
  <version>4.1.36.Final</version>
 </dependency>
</dependencies>

3

SpringBootApplication

启动器中需要new一个NettyServer，并显式调用启动netty。

@SpringBootApplication
public class SpringCloudStudyDemoApplication {
 public static void main(String[] args) {
  SpringApplication.run(SpringCloudStudyDemoApplication.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());
  }
 }
}

4

NettyServer

启动的NettyServer，这里进行配置

/**
 * NettyServer Netty服务器配置
 */
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 WebSocketServerProtocolHandler("/ws", null, true, 65536 * 10));