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在Netty中,可以通过以下方式来设置最大连接数:
- 在ServerBootstrap中使用option()方法设置SO_BACKLOG参数,该参数表示等待接受的连接队列的最大长度。示例代码如下:
ServerBootstrap serverBootstrap = new ServerBootstrap(); serverBootstrap.group(bossGroup, workerGroup) .channel(NioServerSocketChannel.class) .option(ChannelOption.SO_BACKLOG, 100) // 设置最大连接数为100 .childHandler(new MyChannelInitializer());
- 在ChannelInitializer的initChannel()方法中,通过ChannelPipeline添加一个ChannelInboundHandlerAdapter来监听连接数,并进行处理。示例代码如下:
public class MyChannelInitializer extends ChannelInitializer<SocketChannel> { @Override protected void initChannel(SocketChannel ch) throws Exception { ChannelPipeline pipeline = ch.pipeline(); pipeline.addLast(new ConnectionCountHandler()); // 添加连接数监听处理器 pipeline.addLast(new MyHandler1()); pipeline.addLast(new MyHandler2()); } } public class ConnectionCountHandler extends ChannelInboundHandlerAdapter { private static AtomicInteger connectionCount = new AtomicInteger(); @Override public void channelActive(ChannelHandlerContext ctx) throws Exception { int currentCount = connectionCount.incrementAndGet(); if (currentCount > 100) { ctx.channel().close(); // 关闭连接 } super.channelActive(ctx); } @Override public void channelInactive(ChannelHandlerContext ctx) throws Exception { connectionCount.decrementAndGet(); super.channelInactive(ctx); } }
通过上述方式,可以设置最大连接数并监听连接数,并在达到最大连接数时关闭新的连接。