java - 已收到消息未调用

Question

我创建了一个名为 MessageHandler 的类:

@Override
public void initChannel(SocketChannel ch) throws Exception {
    ch.pipeline().addLast(
            new LoggingHandler(LogLevel.INFO),
            new GameServerHandler());
    ch.pipeline().addLast("protobufHandler", new MessageHandler()); 
}

另外，我添加了 messageReceiver 函数，我无法按照文档所述覆盖它，因为它给了我一个错误:

public class MessageHandler extends SimpleChannelInboundHandler<Object> {
    // @Override
    public void messageReceived(ChannelHandlerContext ctx, Object msg) {
        System.out.println(msg);
        // super.messageReceived(ctx, msg);
    }

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

    @Override
    protected void channelRead0(ChannelHandlerContext arg0, Object arg1)
            throws Exception {
        // TODO Auto-generated method stub
    }
}

但是从未调用 messageReceived 函数:

INFO: [id: 0xbb603bfd, /127.0.0.1:54206 => /127.0.0.1:5000] ACTIVE
Oct 07, 2014 10:48:49 PM io.netty.handler.logging.LoggingHandler logMessage
INFO: [id: 0xbf711f5f, /127.0.0.1:54205 => /127.0.0.1:5000] RECEIVED(383B)
// Message printed by the Netty logger, not from my function.

Answer 1

在 netty 4.x 中，您需要重写并将 System.out.println(...) 内容放入的方法是channelRead0(...)。仅在 netty 5 中它的 messageReceived(...)。