PortUtils.java

package io.jafka;

import io.jafka.utils.Closer;

import java.io.IOException;
import java.net.ServerSocket;

/**
 * @author adyliu (imxylz@gmail.com)
 * @since  2013-04-25
 */
public class PortUtils {

    /**
     * check available port on the machine<br/>
     * This will check the next port if the port is already used.
     * @param port the checking port
     * @return a available port
     */
    public static int checkAvailablePort(int port) {
        while (port < 65500) {
            ServerSocket serverSocket = null;
            try {
                serverSocket = new ServerSocket(port);
                return port;
            } catch (IOException e) {
                //ignore error
            } finally {
                Closer.closeQuietly(serverSocket);
            }
            port++;
        }
        throw new RuntimeException("no available port");
    }

    public static void main(String[] args) {
        int port = checkAvailablePort(80);
        System.out.println("The available port is " + port);
    }
}