UDP服务器：广播我目录中存在的所有文件的名称

Question

我想定期广播我目录中所有可用文件的名称。我的计划有什么问题？运行该程序会出现以下错误：

Exception in thread "main" java.nio.BufferOverflowException
at java.nio.HeapByteBuffer.put(HeapByteBuffer.java:183)
at java.nio.ByteBuffer.put(ByteBuffer.java:832)
at UDPServer.main(UDPServer.java:42)

这是服务器代码：

public class UDPServer
{
  public static void main(String[] args)throws IOException
  {
    try (DatagramChannel channel =
            DatagramChannel.open())
            {
                InetSocketAddress local = new InetSocketAddress(0);
                channel.socket().bind(local);
                InetSocketAddress broadcast = new InetSocketAddress("255.255.255.255",5959);
                ByteBuffer buffer = ByteBuffer.allocate(10000);
                while(true)
                {
                    //channel.connect(broadcast);
                    int n=buffer.position()/2;
                    //buffer.flip();
                    buffer.rewind();
                    String fileName = new String();
                    for(int i=0;i<n;i++)
                        fileName += buffer.getChar();
                    DirectoryStream<Path> stream = Files.newDirectoryStream(Paths.get(fileName));
                    for(Path p : stream)
                    {
                        buffer.put(p.toString().getBytes());
                        buffer.flip();
                        channel.send(buffer, broadcast);
                        buffer.clear();
                    }
                 }
            }
   }
}

更新1：

我已将第一个buffer.flip()更改为buffer.rewind()。这删除了BufferOverflowException。接下来我得到了IllegalStateException: connect already invoked。所以我删除了channel.connect(broadcast)。最后，由file.FileSystemException引起IOException: Too many open files。我不知道从哪里开始。