netty如何主动关闭连接

[zhangyshun]

使用telnet连接服务端，发送退出指令，是可以断开连接的。但使用客户端连接，就关闭不了

服务端

public void bind() throws InterruptedException {
		EventLoopGroup bossGroup = new NioEventLoopGroup();
		EventLoopGroup workerGroup = new NioEventLoopGroup();
		
		try {
			ServerBootstrap bootstrap = new ServerBootstrap();
			bootstrap.group(bossGroup, workerGroup);
			bootstrap.channel(NioServerSocketChannel.class);
			bootstrap.childHandler(new ChannelInitializer<SocketChannel>() {
				@Override
				protected void initChannel(SocketChannel ch) throws Exception {
					ChannelPipeline pipeline = ch.pipeline();
					pipeline.addLast(new StringDecoder(Charset.forName("utf-8")));
					pipeline.addLast(new StringEncoder(Charset.forName("utf-8")));
					pipeline.addLast(new NettyServerHandler());
				}
			});
			
			bootstrap.bind("127.0.0.1", 5000).sync().channel().closeFuture().sync();
			
		} finally {
			bossGroup.shutdownGracefully();
			workerGroup.shutdownGracefully();
		}
	}

public class NettyServerHandler extends SimpleChannelInboundHandler<String> {
	
	@Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
		ctx.write("Welcome to" + InetAddress.getLocalHost().getHostName() + "!\r\n");
        ctx.flush();
    }

	@Override
    public void channelRead0(ChannelHandlerContext ctx, String request) throws Exception {
		LogUtil.log("server channelRead0 : " + request);
		
        String response = "server receive : " + request;
        boolean close = false;
        if (request.indexOf("bye") == 0) {
        	close = true;
        	response = "系统退出" + "\r\n";
        }
        
        ChannelFuture future = ctx.writeAndFlush(response);
        if (close) {
//        	future.addListener(ChannelFutureListener.CLOSE).sync().channel().closeFuture().sync();
        	future.addListener(ChannelFutureListener.CLOSE);
        }
    }

	@Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        ctx.close();
    }
}

客户端

public void connect() throws InterruptedException {
		try {
			Bootstrap bootstrap = new Bootstrap();
			bootstrap.group(workerGroup);
			bootstrap.channel(NioSocketChannel.class);
			bootstrap.handler(new ChannelInitializer<SocketChannel>() {
				@Override
				protected void initChannel(SocketChannel ch) throws Exception {
					ChannelPipeline pipeline = ch.pipeline();
					pipeline.addLast(new StringDecoder(Charset.forName("utf-8")));
					pipeline.addLast(new StringEncoder(Charset.forName("utf-8")));
					pipeline.addLast(new NettyClientHandler());
				}
			});
			
			bootstrap.connect("127.0.0.1", 5000).sync().channel().closeFuture().sync();
			
		} finally {
		}
	}

public class NettyClientHandler extends SimpleChannelInboundHandler<String> {

	@Override
	protected void channelRead0(ChannelHandlerContext ctx, String msg)
			throws Exception {
		LogUtil.log("client channelRead0 : " + msg);

		if (msg.contains("系统退出")) {
			LogUtil.log("client ctx.close()");
			ctx.close();

		} else {
			ctx.writeAndFlush("aaa");
			ctx.writeAndFlush("bye");
		}
	}

	@Override
	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
		cause.printStackTrace();
		ctx.close();
	}
}

使用telent就没有问题

[qq_15915835]

直接在服务端调用ctx.close();

[zhangyshun]

把netty版本升到5.0就没问题了

[fishjam]

5.0都已经被废弃了,居然还想升级. 估计可能是粘包了, 可以加入 LineBasedFrameDecoder 试试. 而且可以看看服务器端日志里的 "server channelRead0 :" 打出来的具体值是什么.