Question

我正在尝试使用最新的netty（4.1.5）设置基本的netty UDP服务器。我希望能够做的就是接收数据包并在控制台中显示内容。

我有两个课程如下;

public final class UdpServer {

    private static final int PORT = Integer.parseInt(System.getProperty("port", "6565"));

    public static void main(String[] args) throws Exception {
        EventLoopGroup group = new NioEventLoopGroup();
        try {
            Bootstrap b = new Bootstrap();
            b.group(group)
                    .channel(NioDatagramChannel.class)
                    .handler(new UdpServerHandler());

            b.bind(PORT).sync().channel().closeFuture().await();
        } finally {
            group.shutdownGracefully();
        }
    }
}

处理程序类如下;

public class UdpServerHandler extends SimpleChannelInboundHandler<DatagramPacket> {

    static ByteBuf buf;

    @Override
    public void channelRead0 (ChannelHandlerContext ctx, DatagramPacket packet) throws Exception {
        System.err.println ("Messaged received on " + new Date() + ":\r");

        buf = packet.content();
        byte[] bytes = new byte[buf.readableBytes()];
        buf.readBytes(bytes);
        buf.retain();
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) {
        System.err.println (buf.toString());
        buf.release();
        ctx.flush();
    }

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

现在，每当我发送包含单词heelo的字节数据包时，我总会收到以下消息

Messaged received on Sun Sep 04 23:35:05 BST 2016:
SimpleLeakAwareByteBuf(PooledUnsafeDirectByteBuf(ridx: 5, widx: 5, cap: 2048))

我认为ridx和widx指的是你好的5个字符？

有人可以查看我的代码或进一步了解这个问题吗？感谢

Answer 1

如果要将内容打印为字符串，请使用buf.toString(Charset)

netty basic udp server with bytebuf error SimpleLeakAwareByteBuf toString

1 个答案: