Question

我在java中制作了一个视频会议应用程序。它应该基于UDP。它在局域网上运行良好。现在我将其切换到WAN。经过大量关于NAT后UDP传输问题的阅读（因为不同路由器背后会有用户）。我尝试将孔打孔实现为读取。但它不起作用。我正在使用客户端 - 服务器 - 客户端架构。更确切地说，每个客户端将其图像（或帧）发送到服务器，然后服务器将它们转发给其他客户端。为此，我使用路由器为其分配的客户端IP和端口。然后，服务器将数据包发送给客户端。但是路由器仍然阻止了数据包。谁能告诉我什么应该是一个可靠的解决方案呢？或者有任何库可以有效地实现打孔？

================================================================================== 
client code:
//some code
final Socket client = new Socket(IPaddr, port); // tcp connection 
...
// code for some gui components...
...
String message2="video";
clientSocketReceiver = new DatagramSocket();
String ip = "x.x.x.x";
InetAddress IPAddress = InetAddress.getByName(ip);
ByteArrayOutputStream baos1 = new ByteArrayOutputStream();    
baos1.write(message2.getBytes());
baos1.write('\n');
baos1.flush();
byte[] message2InByte = baos1.toByteArray();
baos1.close();
clientSocketReceiver.send(new DatagramPacket(message2InByte, message2InByte.length,    IPAddress, 8876));
...
//some code....
...

//thread for receiving images..
while (true) {
      byte[] receiveData = new byte[50000];
      DatagramPacket receivePacket = new DatagramPacket(receiveData,receiveData.length);
      clientSocketReceiver.receive(receivePacket);
      InputStream in = new ByteArrayInputStream(receivePacket.getData());
      buffImage = ImageIO.read(in);
      ...
      //code for displaying images on GUI
      ...
}
//==========================================================================


=========================================================================== =
server code:
//code for storing client's ip and port. runs only when a new client is accepted by tcp              socket....

serverSocket=new DatagramSocket(8876);       //declared at starting of code
while (checked==false ) {
       DatagramPacket receivePacket = new  DatagramPacket(receiveData,receiveData.length);
       serverSocket.receive(receivePacket);
       String data = new String(receivePacket.getData());
       data = data.trim();
       if (data.equals("video")) {
             vx.add(receivePacket.getAddress().getHostAddress()); // storing ip
             String tmp = "" + receivePacket.getPort();
             vv.add(tmp);                //storing port. vv and vx r vectors
             checked=true;
       } 
   }

======================================  
//thread for receiving/sending images from/to clients
DatagramSocket serverSocket2 = new DatagramSocket(9876);
byte[] receiveData = new byte[50000];
while (true) {
 DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
 serverSocket2.receive(receivePacket);
 InputStream in = new ByteArrayInputStream(receivePacket.getData());
 bImage = ImageIO.read(in);
 ByteArrayOutputStream baos = new ByteArrayOutputStream();
 ImageIO.write(bImaget, "jpg", baos);
 baos.flush();
 byte[] imageInByte = baos.toByteArray();
 baos.close();
 for (int i = 0; i < vx.size() && i < vv.size(); i++) {
     serverSocket2.send(new DatagramPacket(imageInByte, imageInByte.length, InetAddress.getByName(vx.elementAt(i).toString()), Integer.parseInt(vv.elementAt(i).toString())));
  }
}
=============================================

Java：UDP背后的UDP

0 个答案: