io.netty.util.IllegalReferenceCountException: refCnt: 0
2021/4/19 10:57:55
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io.netty.util.IllegalReferenceCountException: refCnt: 0
- 1.将ByteBuf转为String存起来
- 2.取出消息时可以再转换为ByteBuf
报这个错是因为ByteBuf可能被释放了如
//将buf传到其他类中使用时,ByteBuf可能被释放了 protected void channelRead0(ChannelHandlerContext ctx, DatagramPacket packet) throws Exception { ByteBuf buf = packet.content(); }
1.将ByteBuf转为String存起来
//将buf转为String @Override protected void channelRead0(ChannelHandlerContext ctx, DatagramPacket packet) throws Exception { ByteBuf buf = packet.content(); String con = ByteBufUtil.hexDump(buf); log.info("收到udp数据:{}",con); //消息队列添加消息 UdpQueueServer.queue.put(con); }
2.取出消息时可以再转换为ByteBuf
public class UdpQueueServer{ //消息队列 public static BlockingQueue queue = new ArrayBlockingQueue<>(1024); @Scheduled(fixedDelay = 3000) public void consumerMessage() throws Exception { boolean isRunning = true; while (isRunning) { try { String con = (String) queue.take(); //取出队列中的数据 if (con != null){ log.info("内容:{}",con); //在转为ByteBuf byte[] bytes = ParseUtil.hexStringToBytes(con); ByteBuf buf = Unpooled.wrappedBuffer(bytes); } else { log.info("取出内容为null"); } if(queue.remainingCapacity == 1024){ isRunning = false; } } catch (Exception e) { e.printStackTrace(); log.info("{}",e); } } } //String转16进制 byte[] public static byte[] hexStringToBytes(String hexString) { if (StringUtils.isEmpty(hexString)) { return null; } hexString = hexString.toUpperCase(); int length = hexString.length() / 2; char[] hexChars = hexString.toCharArray(); byte[] d = new byte[length]; for (int i = 0; i < length; i++) { int pos = i * 2; d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1])); } return d; } }
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