Question

我已经建立了一个服务器/客户端，可以通过套接字进行通信。但是我在连接它们时遇到了一些麻烦。

首先我在端口7777（已打开）上启动我的服务器，然后启动我的客户端但得到java.net.BindException。我的编码错了吗？

服务器端：

public Server(int port) { // port = 7777
        this.port = port; // dont bother with this line
        try {
            socket = new DatagramSocket(port);
        } catch (SocketException ex) {
            return;
        }
        run = new Thread(this, "Server");
        run.start(); // starts thread to listen for sent client packets
    }

客户方：

private boolean openConnection(String address, int port) { // returns boolean to check for established connection as well as establish it, port = 7777
        try {
            socket = new DatagramSocket(port); // THE ERROR IN OUTPUT POINTS TO THIS LINE
            ip = InetAddress.getByName(address);
            return true;
        } catch (UnknownHostException | SocketException ex) {
            ex.printStackTrace();
            return false;
        }
    }

堆栈追踪：

java.net.BindException: Address already in use: Cannot bind
    at java.net.DualStackPlainDatagramSocketImpl.socketBind(Native Method)
    at java.net.DualStackPlainDatagramSocketImpl.bind0(DualStackPlainDatagramSocketImpl.java:81)
    at java.net.AbstractPlainDatagramSocketImpl.bind(AbstractPlainDatagramSocketImpl.java:95)
    at java.net.DatagramSocket.bind(DatagramSocket.java:376)
    at java.net.DatagramSocket.<init>(DatagramSocket.java:231)
    at java.net.DatagramSocket.<init>(DatagramSocket.java:284)
    at java.net.DatagramSocket.<init>(DatagramSocket.java:256)
    at chatprogram.client.Client.openConnection(Client.java:45)
    at chatprogram.client.Client.<init>(Client.java:35)
    at chatprogram.client.Login1$8.run(Login1.java:104)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
    at java.awt.EventQueue.access$200(EventQueue.java:103)
    at java.awt.EventQueue$3.run(EventQueue.java:694)
    at java.awt.EventQueue$3.run(EventQueue.java:692)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)

CMD netstat -an output：

我没有10个代表：http://prntscr.com/4f1hmf和http://prntscr.com/4f1hs3

Answer 1

不要在客户端创建DatagramSocket。只需创建一个Socket，它就不会在本地绑定到特定端口（就像服务器一样）：

new Socket(address, port);

Answer 2

抱歉浪费你的时间大家！

错误发生在客户端：

socket = new DatagramSocket(); // REMOVED THE PORT PARAMETER, works fine

如果我能在这里回复所有回复我的人，我愿意。但是再次感谢大家:)。

Answer 3

您是否启用了Hyper V？

如果是：

Disable Hyper-V

使用以下命令保留端口

C:\WINDOWS\system32>netsh int ipv4 add excludedportrange protocol=tcp startport=49838 numberofports=1

最后：

Enable Hyper-V

检查：https://github.com/googlevr/gvr-unity-sdk/issues/1002

Java服务器客户端绑定错误

3 个答案: