我在

http://docs.oracle.com/javase/tutorial/networking/datagrams/broadcasting.html關注UDP教程,我已經復制了所有代碼并編譯了它,現在如果我先編譯客戶端然后再編譯服務器,服務器會在控制臺中打印出來

Exception in thread "main" java.net.BindException: Address already in use: Cannot bind

at java.net.PlainDatagramSocketImpl.bind0(Native Method)

at java.net.PlainDatagramSocketImpl.bind(Unknown Source)

at java.net.DatagramSocket.bind(Unknown Source)

at java.net.DatagramSocket.(Unknown Source)

at java.net.DatagramSocket.(Unknown Source)

at java.net.DatagramSocket.(Unknown Source)

at QuoteServerThread.(QuoteServerThread.java:19)

at MulticastServerThread.(MulticastServerThread.java:10)

at MulticastServer.main(MulticastServer.java:3)

QuoteServerThread第19行是

socket = new DatagramSocket(12345);

MulticastServerThread第10行是

public MulticastServerThread() throws IOException {

super("MulticastServerThread"); // line 10

}

MulticastServer第3行是

public class MulticastServer {

public static void main(String[] args) throws java.io.IOException {

new MulticastServerThread().start(); // line 3

}

}

如果我先啟動服務器,然后是客戶端,客戶端會在控制臺中打印出來

Exception in thread "main" java.net.BindException: Address already in use: Cannot bind

at java.net.PlainDatagramSocketImpl.bind0(Native Method)

at java.net.PlainDatagramSocketImpl.bind(Unknown Source)

at java.net.DatagramSocket.bind(Unknown Source)

at java.net.MulticastSocket.(Unknown Source)

at java.net.MulticastSocket.(Unknown Source)

at MulticastClient.main(MulticastClient.java:9)

MulticastClient第9行是

MulticastSocket socket = new MulticastSocket(12345);

看看這些錯誤,在我看來,它與偵聽端口有關,我該如何解決這個問題呢？

帆布

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