java – 在Netty中关闭客户端连接

我有简单的Netty客户端/服务器应用程序.在服务器端,我检查客户端是否从正确的主机连接,如果它不正确,请关闭客户端的连接.在服务器端我使用此代码:

@Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {

        String remoteAddress = ctx.channel().remoteAddress().toString();
        if(!"/127.0.0.1:42477".equals(remoteAddress)) {
            ctx.writeAndFlush("Not correct remote address! Connection closed");
            ctx.close();
        }
        System.out.println(remoteAddress);
    }

在客户端这一个:

@Override
    protected void channelRead0(ChannelHandlerContext ctx, String data) throws Exception {
        try {
            System.err.println(data);
        } finally {
            ReferenceCountUtil.retain(data);
        }       
    }

但我无法从服务器端获取ctx.writeAndFlush()和客户端关闭的消息,但异常:

java.io.IOException: Соединение сброшено другой стороной(TRANSLATION: Connection reset from the other side)
    at sun.nio.ch.FileDispatcherImpl.read0(Native Method)
    at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:39)
    at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223)
    at sun.nio.ch.IOUtil.read(IOUtil.java:192)
    at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:379)
    at io.netty.buffer.UnpooledUnsafeDirectByteBuf.setBytes(UnpooledUnsafeDirectByteBuf.java:447)
    at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:881)
    at io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:242)
    at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:119)
    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468)
    at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382)
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354)
    at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:111)
    at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137)
    at java.lang.Thread.run(Thread.java:745)

我如何以严谨的方式关闭客户端连接?我是网络新手

最佳答案
ctx.writeAndFlush是异步的,因此可以在数据实际写入通道之前返回.但是,它会返回一个ChannelFuture,它允许您添加一个侦听器,该侦听器将在操作完成时得到通知.要确保仅在写入数据后关闭通道,您可以执行以下操作:

ctx.writeAndFlush("Not correct remote address! Connection closed")
        .addListener(ChannelFutureListener.CLOSE);

转载注明原文:java – 在Netty中关闭客户端连接 - 代码日志