Netty-自定义Handler失效

1、问题描述

服务启动后，客户端断开重连后无法与服务端交互。

@Component
@Slf4j
public class PotatoChannelInitializer extends ChannelInitializer<SocketChannel> {

    //重点
    @Autowired
    private PotatoChannelHandler potatoChannelHandler;

    @Override
    protected void initChannel(SocketChannel ch) throws Exception {
        ChannelPipeline pipeline = ch.pipeline();
        //入站解码器
        pipeline.addLast(new ProtobufVarint32FrameDecoder());
        pipeline.addLast(new ProtobufDecoder(MsgProto.Msg.getDefaultInstance()));
        //出站编码器
        pipeline.addLast(new ProtobufVarint32LengthFieldPrepender());
        pipeline.addLast(new ProtobufEncoder());
        //自定义处理器
        pipeline.addLast(potatoChannelHandler);
    }
}
@Component
@Slf4j
public class PotatoChannelHandler extends ChannelInboundHandlerAdapter {

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object obj) throws Exception {
        MsgProto.Msg msg = (MsgProto.Msg) obj;
        log.info("===收到client消息：" + msg);
        //回复消息
        ctx.writeAndFlush(msg);
    }
}

2、原因和解决办法

原因：由于服务端自定义handler没有共享，导致新连接没有自定义的Handler处理器。

解决方法：使用@ChannelHandler.Sharable注解修饰自定义处理器

@Component
@Slf4j
@ChannelHandler.Sharable
public class PotatoChannelHandler extends ChannelInboundHandlerAdapter {

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object obj) throws Exception {
        MsgProto.Msg msg = (MsgProto.Msg) obj;
        log.info("===收到client消息：" + msg);
        //回复消息
        ctx.writeAndFlush(msg);
    }
}