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Stanford CoreNLP provides a set of natural language analysis tools which can take raw English language text input and give the base forms of words, their parts of speech, whether they are names of companies, people, etc., normalize dates, times, and numeric quantities, mark up the structure of sentences in terms of phrases and word dependencies, and indicate which noun phrases refer to the same entities. It provides the foundational building blocks for higher level text understanding applications.

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package edu.stanford.nlp.net;

import java.io.*;
import java.net.*;

/**
 * Contains a couple useful utility methods related to networks.  For
 * example, contains a method which checks if a port is available, and
 * contains a method which scans a range of ports until it finds an
 * available port.
 * 

 * @author John Bauer
 */
public class Ports {
  /**
   * Checks to see if a specific port is available.
   * 

   * Source: Apache's mina project, via stack overflow
   *  http://stackoverflow.com/questions/434718/
   *    sockets-discover-port-availability-using-java
   *
   * @param port the port to check for availability
   */
  public static boolean available(int port) {
    ServerSocket ss = null;
    DatagramSocket ds = null;
    try {
      ss = new ServerSocket(port);
      ss.setReuseAddress(true);
      ds = new DatagramSocket(port);
      ds.setReuseAddress(true);
      return true;
    } catch (IOException e) {
    } finally {
      if (ds != null) {
        ds.close();
      }
      
      if (ss != null) {
        try {
          ss.close();
        } catch (IOException e) {
          // should not be thrown
        }
      }
    }
    
    return false;
  }

  /**
   * Scan a range of ports to find the first available one.
   */
  public static int findAvailable(int min, int max) {
    for (int port = min; port < max; ++port) {
      if (available(port)) {
        return port;
      }
    }
    return max;
  }
}