springboot netty 服务端和客户端的例子

Spring Boot 和 Netty 结合可以用来构建高性能的网络服务，尤其是用于WebSocket、HTTP/2等实时通信场景。这里简要概述一下服务端和客户端的基本例子：

**服务端（Spring Boot + Netty Server）**:

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;

@SpringBootApplication
public class SpringBootNettyServerApplication {

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

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

        try {
            ServerBootstrap b = new ServerBootstrap();
            b.group(bossGroup, workerGroup)
                    .channel(NioServerSocketChannel.class)
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel ch) throws Exception {
                            // 这里通常会处理消息接收、协议解析等工作，并可能关联到Spring的消息转换
                            ch.pipeline().addLast(new MyMessageHandler());
                        }
                    });

            ChannelFuture f = b.bind(8080).sync();
            System.out.println("服务器已启动, 端口为: " + f.channel().localAddress());

            f.channel().closeFuture().sync(); // 关闭通道
        } finally {
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }

    private static class MyMessageHandler extends ChannelInboundHandlerAdapter { ... } // 自定义消息处理器
}

**客户端（简单的Netty Client示例）**:

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;

public class SimpleNettyClient {

    public static void main(String[] args) {
        EventLoopGroup group = new NioEventLoopGroup();
        Bootstrap bootstrap = new Bootstrap();
        bootstrap.group(group)
                .channel(NioSocketChannel.class)
                .handler(new ChannelInitializer<SocketChannel>() {
                    @Override
                    protected void initChannel(SocketChannel ch) throws Exception {
                        ch.pipeline().addLast(new MyNettyClientHandler());
                    }
                })
                .connect("localhost", 8080); // 替换为你服务端的实际地址和端口

        ChannelFuture future = bootstrap.connect();
        future.sync();
        System.out.println("连接成功");

        future.channel().closeFuture().sync(); // 关闭连接
        group.shutdownGracefully();
    }

    private static class MyNettyClientHandler extends ChannelInboundHandlerAdapter {...} // 自定义客户端处理器
}

在这个例子中，`MyMessageHandler`和`MyNettyClientHandler`分别是服务端和客户端的自定义处理器，它们负责接收和发送数据以及处理业务逻辑。