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我使用默认构造函数创建客户端套接字 .
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我通过端口45500向服务器发送数据包 .
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我在端口45500上收到服务器端的数据包
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我在服务器端创建了一个新套接字
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我用新的serverSocket发送一个ack . ack被发送到receivedPacket.getport（）
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客户端什么都没收到，除非我不在服务器端创建一个新的套接字，只是发送带有旧套接字的ack（带有硬编码端口45500）
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我不知道发生了什么事！
客户
DatagramSocket clientSocket = new DatagramSocket();
byte[] receiveData = new byte[5000];
DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
byte[] connection = connectionRequest.getBytes();
InetAddress IPAdress = InetAddress.getByName("169.xxx.xx.xxx");
DatagramPacket packet = new DatagramPacket(connection, connection.length, IPAdress, 45500);
clientSocket.send(packet);
// doesn't receive unless port #45500 on server side sends!
clientSocket.receive(receivePacket);
服务器
DatagramSocket connectionSocket = new DatagramSocket(45500);
byte[] receiveData = new byte[5000];
DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
connectionSocket.receive(receivePacket);
int clientPort = receivePacket.getPort();
InetAddress IP = receivePacket.getAddress();
byte[] sendData = ("accepted").getBytes();
DatagramSocket serverSocket = new DatagramSocket();
// doesn't work unless connectionSocket (port 45500) sends!
serverSocket.send(new DatagramPacket(sendData, sendData.length, IP, clientPort));
1 回答
停用双方的windows10防火墙就行了！