Question

我遇到以下问题。每当我使用相同的en和Decoder从我的客户端向我的服务器发送数据包时，我的服务器控制台中出现以下错误：

    io.netty.handler.codec.DecoderException: java.lang.IndexOutOfBoundsException: readerIndex(72) + length(8) exceeds writerIndex(77): UnpooledByteBufAllocator$InstrumentedUnpooledUnsafeNoCleanerDirectByteBuf(ridx: 72, widx: 77, cap: 1024)
        at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:461)
        at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:267)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:356)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:342)
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:335)
        at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1294)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:356)
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:342)
        at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:911)
        at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
        at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:645)
        at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:580)
        at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:497)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:459)
        at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:131)
        at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:138)
        at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IndexOutOfBoundsException: readerIndex(72) + length(8) exceeds writerIndex(77): UnpooledByteBufAllocator$InstrumentedUnpooledUnsafeNoCleanerDirectByteBuf(ridx: 72, widx: 77, cap: 1024)
        at io.netty.buffer.AbstractByteBuf.checkReadableBytes0(AbstractByteBuf.java:1168)
        at io.netty.buffer.AbstractByteBuf.readLong(AbstractByteBuf.java:651)
        at net.rinet.rnclo.network.encoding.PacketDecoder.decode(PacketDecoder.java:27)
        at net.rinet.rnclo.network.encoding.PacketDecoder.decode(PacketDecoder.java:39)
        at net.rinet.rnclo.network.encoding.PacketDecoder.decode(PacketDecoder.java:39)
        at net.rinet.rnclo.network.encoding.PacketDecoder.decode(PacketDecoder.java:39)
        at net.rinet.rnclo.network.encoding.PacketDecoder.decode(PacketDecoder.java:39)
        at net.rinet.rnclo.network.encoding.PacketDecoder.decode(PacketDecoder.java:39)
        at net.rinet.rnclo.network.encoding.PacketDecoder.decode(PacketDecoder.java:39)
        at net.rinet.rnclo.network.encoding.PacketDecoder.decode(PacketDecoder.java:39)
        at net.rinet.rnclo.network.encoding.PacketDecoder.decode(PacketDecoder.java:39)
        at net.rinet.rnclo.network.encoding.PacketDecoder.decode(PacketDecoder.java:39)
        at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:491)
        at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:430)
        ... 16 more

我的来源看起来像这样：

编码器：

import net.rinet.rnclo.network.Packet;
import net.rinet.rnclo.network.PacketRegistry;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToByteEncoder;
import lombok.AllArgsConstructor;
import lombok.NoArgsConstructor;

/**
 * JavaDoc this file!
 *
 * @author Pascal
 * @version 29.10.2017
 */
@AllArgsConstructor
@NoArgsConstructor
public class PacketEncoder extends MessageToByteEncoder<Packet> {
    private PacketRegistry packetRegistry;

    @Override
    protected void encode(ChannelHandlerContext ctx, Packet packet, ByteBuf output) throws Exception {
        long id = this.packetRegistry.getPacketIdByClass(packet.getClass());
        output.writeLong(id);
        packet.write(output);
    }
}

我的解码器看起来像这样：

package net.rinet.rnclo.network.encoding;

import net.rinet.rnclo.network.Packet;
import net.rinet.rnclo.network.PacketRegistry;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;
import lombok.AllArgsConstructor;
import lombok.NoArgsConstructor;

import java.util.List;

/**
 * JavaDoc this file!
 *
 * @author Pascal
 * @version 29.10.2017
 */
@AllArgsConstructor
@NoArgsConstructor
public class PacketDecoder extends ByteToMessageDecoder {
    private PacketRegistry packetRegistry;

    @Override
    public void decode(ChannelHandlerContext channelHandlerContext, ByteBuf byteBuf, List<Object> outputList) throws Exception {
        if(byteBuf.isReadable(2)) {
            long id = byteBuf.readLong();

            if(packetRegistry.checkPacketId(id)) {
                Class<? extends Packet> packetClass = packetRegistry.getPacketClassById(id);
                Packet receivedPacket = packetClass.newInstance();
                try {
                    receivedPacket.read(byteBuf);
                } catch (Throwable t) {
                    t.printStackTrace();
                }
                outputList.add(receivedPacket);
            } else {
                decode(channelHandlerContext, byteBuf, outputList);
            }
        }
    }
}

我的数据包看起来像这样：https://hastebin.com/atirenevuw.java

我对每个有用的答案感到非常高兴！帕斯卡

Answer 1

您正在检查是否可以读取2个字节，但之后您会读取8个字节。

更改此

        if(byteBuf.isReadable(2)) {
            long id = byteBuf.readLong();

到

        if(byteBuf.isReadable(8)) {
            long id = byteBuf.readLong();

网络解码器编码器错误

1 个答案: