Closing a client connection in Netty
I have a simple Netty client / network application. on the server side. I am checking if the client is connected to the correct host or not and if it is not correct then close the client connection. on the server side I am using this code:
@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);
}
and on the client side this is:
@Override
protected void channelRead0(ChannelHandlerContext ctx, String data) throws Exception {
try {
System.err.println(data);
} finally {
ReferenceCountUtil.retain(data);
}
}
but i cant get the server side message in ctx.writeAndFlush () and client side shutdown with exception:
java.io.IOException: (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)
How can I close the client connection exactly? I am new to netty
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ctx.writeAndFlush
is asynchronous and therefore can return before the data is actually written to the pipe. However, it does return ChannelFuture
, which allows you to add a listener that will be notified when the operation is complete. To ensure that the channel is closed only after the data has been written, you can do the following:
ctx.writeAndFlush("Not correct remote address! Connection closed")
.addListener(ChannelFutureListener.CLOSE);
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