springboot+netty+websocket实现局域网音视频通话

实现局域网音视频通话可以用Spring Boot作为后端框架，Netty作为网络通信框架，WebSocket作为实现双向通信的协议。以下是一个简单的实现过程：

1. 首先需要搭建一个Spring Boot项目，可以使用Spring Initializr来快速生成项目。在pom.xml中添加Netty和WebSocket的依赖，例如：

<dependency>
    <groupId>io.netty</groupId>
    <artifactId>netty-all</artifactId>
    <version>4.1.25.Final</version>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-websocket</artifactId>
</dependency>

2. 创建一个WebSocket处理器类，用来处理WebSocket的连接、关闭和消息收发等逻辑。例如：

@Component
@ServerEndpoint("/video-chat")
public class VideoChatHandler {

    private static final Logger LOGGER = LoggerFactory.getLogger(VideoChatHandler.class);

    @OnOpen
    public void onOpen(Session session) {
        LOGGER.info("WebSocket opened: {}", session.getId());
    }

    @OnMessage
    public void onMessage(String message, Session session) {
        LOGGER.info("Received message: {}", message);
        // TODO: 处理收到的消息
    }

    @OnClose
    public void onClose(Session session) {
        LOGGER.info("WebSocket closed: {}", session.getId());
    }

    @OnError
    public void onError(Throwable error) {
        LOGGER.error("WebSocket error", error);
    }

}

3. 在Spring Boot的配置类中添加WebSocket的配置，例如：

@Configuration
@EnableWebSocket
public class WebSocketConfig implements WebSocketConfigurer {

    @Autowired
    private VideoChatHandler videoChatHandler;

    @Override
    public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
        registry.addHandler(videoChatHandler, "/video-chat").setAllowedOrigins("*");
    }

}

4. 使用Netty来实现音视频的传输。可以使用Netty提供的UDP协议来实现多人音视频通话，也可以使用TCP协议来实现点对点的音视频通话。需要根据实际情况选择相应的协议，这里以TCP协议为例：

@Component
public class VideoChatServer {

    private static final Logger LOGGER = LoggerFactory.getLogger(VideoChatServer.class);

    @Value("${server.video-chat.port}")
    private int port;

    @PostConstruct
    public void start() {
        EventLoopGroup bossGroup = new NioEventLoopGroup();
        EventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap bootstrap = new ServerBootstrap();
            bootstrap.group(bossGroup, workerGroup)
                    .channel(NioServerSocketChannel.class)
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        public void initChannel(SocketChannel ch) throws Exception {
                            ChannelPipeline pipeline = ch.pipeline();
                            // TODO: 添加音视频相关的编解码器和处理器
                        }
                    })
                    .option(ChannelOption.SO_BACKLOG, 128)
                    .childOption(ChannelOption.SO_KEEPALIVE, true);

            ChannelFuture future = bootstrap.bind(port).sync();
            LOGGER.info("Video chat server started on port {}", port);

            future.channel().closeFuture().sync();
        } catch (InterruptedException e) {
            LOGGER.error("Video chat server interrupted", e);
        } finally {
            workerGroup.shutdownGracefully();
            bossGroup.shutdownGracefully();
        }
    }

}

5. 在WebSocket处理器中实现音视频数据的收发逻辑。当收到音视频数据时，可以将数据转发给所有连接的WebSocket客户端。例如：

@Component
@ServerEndpoint("/video-chat")
public class VideoChatHandler {

    private static final Logger LOGGER = LoggerFactory.getLogger(VideoChatHandler.class);

    private List<Session> sessions = new CopyOnWriteArrayList<>();

    @OnOpen
    public void onOpen(Session session) {
        LOGGER.info("WebSocket opened: {}", session.getId());
        sessions.add(session);
    }

    @OnMessage
    public void onMessage(ByteBuffer buffer, Session session) throws IOException {
        LOGGER.info("Received video data from {}", session.getId());
        byte[] data = new byte[buffer.remaining()];
        buffer.get(data);
        for (Session s : sessions) {
            if (s.isOpen() && !s.getId().equals(session.getId())) {
                s.getBasicRemote().sendBinary(ByteBuffer.wrap(data));
            }
        }
    }

    @OnClose
    public void onClose(Session session) {
        LOGGER.info("WebSocket closed: {}", session.getId());
        sessions.remove(session);
    }

    @OnError
    public void onError(Throwable error) {
        LOGGER.error("WebSocket error", error);
    }

}

6. 在前端页面中使用WebSocket来实现音视频通话。可以使用WebRTC等技术来实现音视频采集、编解码、传输等功能。这里不再赘述。

以上就是一个简单的局域网音视频通话的实现过程。需要注意的是，音视频通话涉及到的技术较多，需要根据实际情况进行选择和配置。