Java

Bind and Listen on an Available Port in a Range

Demonstrates Socket.BindAndListenPortRange, which searches an inclusive port range for an available TCP port, binds it, and begins listening. It returns the selected port, or -1 on failure.

Background. This is useful when any of several ports is acceptable and the application needs to discover which one was bound.

Chilkat Java Downloads

Download Chilkat for Java

Chilkat2 Java

import com.chilkatsoft.chilkat2.Socket;

public class ChilkatExample {

    public static void main(String[] args) {
        Socket socket = new Socket();

        // Search the inclusive port range for an available TCP port, bind it, and begin listening.  The
        // method returns the selected port, or -1 when no port can be bound.
        int boundPort = socket.bindAndListenPortRange(5000, 5100, 25);
        if (boundPort < 0) {
            System.out.println(socket.getLastErrorText());
            return;
        }

        System.out.println("Listening on port " + boundPort);
    }
}