springboot整合netty实现tcp发送消息完整代码

好的，以下是一个简单的 Spring Boot 整合 Netty 实现 TCP 发送消息的完整代码：

首先，需要在 pom.xml 中添加对 Netty 的依赖：

<dependency>
    <groupId>io.netty</groupId>
    <artifactId>netty-all</artifactId>
    <version>4.1.53.Final</version>
</dependency>

然后，创建一个 Netty 服务端：

@Component
public class NettyServer {

    private final EventLoopGroup bossGroup = new NioEventLoopGroup();
    private final EventLoopGroup workerGroup = new NioEventLoopGroup();

    @Value("${netty.port}")
    private int port;

    @PostConstruct
    public void start() throws Exception {
        ServerBootstrap bootstrap = new ServerBootstrap();
        bootstrap.group(bossGroup, workerGroup)
                .channel(NioServerSocketChannel.class)
                .option(ChannelOption.SO_BACKLOG, 100)
                .childHandler(new ChannelInitializer<SocketChannel>() {
                    @Override
                    protected void initChannel(SocketChannel ch) {
                        ch.pipeline().addLast(new StringDecoder());
                        ch.pipeline().addLast(new StringEncoder());
                        ch.pipeline().addLast(new NettyServerHandler());
                    }
                });

        ChannelFuture future = bootstrap.bind(port).sync();
        if (future.isSuccess()) {
            System.out.println("Netty server started on port " + port);
        }
    }

    @PreDestroy
    public void stop() throws Exception {
        bossGroup.shutdownGracefully();
        workerGroup.shutdownGracefully();
    }
}

其中，NettyServerHandler 是自定义的处理器，用于处理接收到的消息。

接下来，创建一个 Netty 客户端：

@Component
public class NettyClient {

    private final EventLoopGroup group = new NioEventLoopGroup();

    @Value("${netty.host}")
    private String host;

    @Value("${netty.port}")
    private int port;

    public void send(String message) throws Exception {
        Bootstrap bootstrap = new Bootstrap();
        bootstrap.group(group)
                .channel(NioSocketChannel.class)
                .handler(new ChannelInitializer<SocketChannel>() {
                    @Override
                    protected void initChannel(SocketChannel ch) {
                        ch.pipeline().addLast(new StringEncoder());
                    }
                });

        ChannelFuture future = bootstrap.connect(host, port).sync();
        if (future.isSuccess()) {
            Channel channel = future.channel();
            channel.writeAndFlush(message);
            channel.closeFuture().sync();
        }
    }

    @PreDestroy
    public void stop() throws Exception {
        group.shutdownGracefully();
    }
}

最后，在 application.yml 中配置 Netty 的端口和主机：

netty:
  port: 8080
  host: localhost

然后就可以在需要发送消息的地方注入 NettyClient，并调用 send 方法发送消息了。