[英]Java UDP client/server over internet does not work
我正在嘗試實現來回發送消息的UDP客戶端和服務器。
我的服務器在端口6060的本地IP .215上設置,而我的客戶端在端口6061的本地IP .101上設置。兩個端口都已在路由器(UDP)上轉發。 我使用一些在線工具測試了端口,並確認端口已打開。
服務器通過偵聽開始,這意味着客戶端將發送第一條消息。 當客戶端將其消息發送到端口6060上的本地IP .215時,通信將按預期進行。但是,當客戶端使用相同的端口將其消息發送到Internet IP時,服務器將不會收到任何消息。 我不理解為什么。
下面是我給客戶的代碼:
public static void main(String args[]) throws Exception {
DatagramSocket clientSocket = null;
clientSocket = new DatagramSocket(null);
clientSocket.bind(new InetSocketAddress("192.168.1.101", 6061));
InetAddress serverIPAddress = InetAddress.getByName("my.internet.ip");
int serverPort = 6060;
byte[] sendData = new byte[504];
byte[] receiveData = new byte[504];
while (true) {
String sentence = "A" + Double.toString(Math.random()) + "A";
sendData = sentence.getBytes();
DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, serverIPAddress, serverPort);
clientSocket.send(sendPacket);
DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
clientSocket.receive(receivePacket);
String modifiedSentence = new String(receivePacket.getData());
}
}
下面是我的服務器代碼:
public static void main(String[] args) throws IOException {
DatagramSocket serverSocket = new DatagramSocket(null);
InetSocketAddress serverAddress = new InetSocketAddress("192.168.1.215", 6060);
serverSocket.bind(serverAddress);
byte[] receiveData = new byte[504];
byte[] sendData = new byte[504];
while (true) {
DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
serverSocket.receive(receivePacket);
String sentence = new String(receivePacket.getData());
InetAddress IPAddress = receivePacket.getAddress();
int port = receivePacket.getPort();
String capitalizedSentence = sentence.toUpperCase();
sendData = capitalizedSentence.getBytes();
DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, port);
serverSocket.send(sendPacket);
}
}
我刪除了不必要的代碼,例如控制台打印等,以使其更具可讀性。
有什么想法為什么它不起作用,即通過Internet IP發送消息?
您的路由器不使用NAT反射,此功能是路由器允許從本地網絡內部(通過內部使用端口轉發規則)通過公用IP地址訪問服務的功能。
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