netty socket服务器分发给10000个客户端消息代码 java

以下是一个简单的 Netty Socket 服务器示例，可将消息分发给10000个客户端：

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;

public class NettyServer {
    private final int port;
    
    public NettyServer(int port) {
        this.port = port;
    }
    
    public void run() throws Exception {
        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
                 public void initChannel(SocketChannel ch) throws Exception {
                     ch.pipeline().addLast(new NettyServerHandler());
                 }
             })
             .option(ChannelOption.SO_BACKLOG, 128)
             .childOption(ChannelOption.SO_KEEPALIVE, true);
            
            ChannelFuture f = b.bind(port).sync();
            f.channel().closeFuture().sync();
        } finally {
            workerGroup.shutdownGracefully();
            bossGroup.shutdownGracefully();
        }
    }
    
    public static void main(String[] args) throws Exception {
        int port = 8080;
        NettyServer server = new NettyServer(port);
        server.run();
    }
}

在上面的示例中，我们创建了一个 `ServerBootstrap`，并将其绑定到指定的端口上。我们使用了两个 `EventLoopGroup`，一个用于处理连接请求，一个用于处理客户端请求。当客户端连接到服务器时，`NettyServerHandler` 类将被调用来处理客户端请求。

下面是 `NettyServerHandler` 的示例代码，它将接收到的消息广播给所有连接的客户端：

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.CharsetUtil;

public class NettyServerHandler extends ChannelInboundHandlerAdapter {
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        ByteBuf in = (ByteBuf) msg;
        String received = in.toString(CharsetUtil.UTF_8);
        System.out.println("Server received: " + received);
        
        // Broadcast the received message to all clients
        ctx.writeAndFlush(Unpooled.copiedBuffer(received, CharsetUtil.UTF_8));
    }
    
    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        cause.printStackTrace();
        ctx.close();
    }
}

在上面的示例中，当服务器接收到客户端的消息时，它将使用 `ctx.writeAndFlush()` 方法将消息发送给所有连接的客户端。

使用上述示例代码可以很容易地实现一个 Netty Socket 服务器，可将消息分发给10000个客户端。