io.netty.util.IllegalReferenceCountException: refCnt: 0
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;
}
}