Question

我有一个应用程序，通过TCp发送sendind LogRecord，我想捕获这些日志。我是Netty的新手，在用一些例子进行捕获后，我无法读取LogRecord对象。

我尝试获取字节数组来反序列化对象，但是我收到了错误。有人可以给我一个很好的例子或提示。

以下是代码：

@Component
@Qualifier("socketChannelInitializer")
public class SocketChannelInitializer extends ChannelInitializer<SocketChannel> {

    private static final ByteArrayDecoder DECODER = new ByteArrayDecoder();
    private static final ByteArrayEncoder ENCODER = new ByteArrayEncoder();

    @Autowired
    @Qualifier("socketServerHandler")
    private ChannelInboundHandlerAdapter socketServerHandler;

    @Override
    protected void initChannel(SocketChannel socketChannel) throws Exception {
        ChannelPipeline pipeline = socketChannel.pipeline();

        // Add the text line codec combination first,
        pipeline.addLast(new DelimiterBasedFrameDecoder(1024 * 1024, Delimiters.lineDelimiter()));
        // the encoder and decoder are static as these are sharable
        pipeline.addLast(DECODER);
        pipeline.addLast(ENCODER);

        pipeline.addLast(socketServerHandler);
    }
}

以下是处理程序的一部分：

@Override
protected void channelRead0(ChannelHandlerContext ctx, byte[] msg) throws Exception {
    ByteBuffer byteBuffer = ByteBuffer.wrap(msg).asReadOnlyBuffer();

}

Answer 1

魔法就在这个班级

public class LogRecordDecoder extends ByteToMessageDecoder {
    @Override
    protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) {

        LogRecord logRecord  = null;
        byte[] bytes = new byte[in.readableBytes()];
        int readerIndex = in.readerIndex();
        in.getBytes(readerIndex, bytes);

        ObjectInputStream ois = null;
        ByteArrayInputStream inn = new ByteArrayInputStream(bytes);

        try {
            ois = new ObjectInputStream(inn);
            logRecord  = (LogRecord) ois.readObject();
            out.add(logRecord);
        } catch (Exception e) {

        }
    }
}

如何通过Netty接收LogRecord？

1 个答案: