Padding and Masking

Padding and Masking in Groovy vs Java.
Example with zero padding:

       


    
JAVA:



public static String addPreceedingZeros(String str, int len)

    {

        if (str == null)

        {

            return null;

        }

        StringBuilder buf = new StringBuilder(str);

        while (buf.length() < len)

        {

            buf.insert(0, "0");

        }

        return buf.toString();

    }



GROOVY:



def str = '5';

str = str.padLeft(5,'0')




   
 

Example with credit card mask:

       


JAVA:



public static String maskCardNumber(String cardNumber, String mask) {



    // format the number

    int index = 0;

    StringBuilder maskedNumber = new StringBuilder();

    for (int i = 0; i < mask.length(); i++) {

        char c = mask.charAt(i);

        if (c == '#') {

            maskedNumber.append(cardNumber.charAt(index));

            index++;

        } else if (c == 'x') {

            maskedNumber.append(c);

            index++;

        } else {

            maskedNumber.append(c);

        }

    }



    // return the masked number

    return maskedNumber.toString();

}



println maskCardNumber("1234123412341234", "*************####")



GROOVY:



def card_number = "1234123412341234"

card_number.replaceFirst('.*(?=.{4})', { match ->; return "".padLeft(match.length(), '*')});

  
 

Groovy Web Service

It's very simple to create a web service with Groovy, look a this:

       



@Grab(group='org.codehaus.groovy.modules', module='groovyws', version='0.5.2')

import groovyx.net.ws.WSServer

import java.security.SecureRandom

 import java.math.BigInteger

class UtilsService

{

     double add(double arg0, double arg1)

     {

          return (arg0 + arg1)

     }




    double square(double arg0)

    {

         return (arg0 * arg0)

    }

  

   String randomPassword()

   {

       SecureRandom random = new SecureRandom()

       return new BigInteger(130, random).toString(32)

   }




   long random()

  {

         Random random = new Random();

         long randInt = random.nextLong()

       

 if (randInt < 0) 

        {  

            randInt = randInt*-1L; 

        }
     return randInt;


  }



  String randomPhrase()

  {

      String[] randomStrings = new String[4];

      Random random = new Random();

      for(int i = 0; i < randomStrings.length; i++)

     {

          char[] word = new char[random.nextInt(8)+3];

         // words of length 3 through 10. (1 and 2 letter words are boring.)

          for(int j = 0; j < word.length; j++)

         {

            word[j] = (char)(99 + random.nextInt(26));

         }

         randomStrings[i] = new String(word);

     }

     String words = "";

     for(String word:randomStrings)

     {

         words+= word+" ";       

     }

     return words.trim();

 }

  

}

def server = new WSServer()

//Start your service

server.setNode("UtilsService", "http://localhost:6980/UtilsService")

server.start()



  
 

Now you can test this with SoapUI or with this code:

       


@Grab(group='org.codehaus.groovy.modules', module='groovyws', version='0.5.2')



import groovyx.net.ws.WSClient



def proxy = new WSClient("http://localhost:6980/UtilsService?WSDL", this.class.classLoader)
proxy.initialize()



 result = proxy.add(23.88, 24.88)

println "You are sum is: "+result




  
 

Simple currency converter in Groovy Swing Style

Simple currency converter in Groovy Swing Style:

       
@Grab(group='org.codehaus.groovy.modules', module='groovyws', version='0.5.2')



 import groovyx.net.ws.WSClient



class TryIt

{

      groovy.swing.SwingBuilder swing = new groovy.swing.SwingBuilder()

      def proxy = new WSClient("http://www.webservicex.net/CurrencyConvertor.asmx?WSDL",                       TryIt.class.classLoader)

      def currency = ['USD', 'EUR', 'CAD', 'GBP', 'AUD', 'SGD','SEK','DKK','NOK']

      def rate = 0.0

      def exc = 1.0

    

     void main()

    {

           proxy.initialize()

           def refresh = swing.action(
          name:'Refresh',
          closure:this.&refreshText,
          mnemonic:'R'
        )

           def frame = swing.frame(title:'Currency Demo')

           {

                  panel

                 {

                       label 'Currency rate from '

                       comboBox(id:'from', items:currency)

                       label ' to '

                      comboBox(id:'to', items:currency)

                      label ' rate '

                      textField(id:'currency', columns:10, rate.toString(),editable:false)

                      label ' exchange '

                      textField(id:'exchange', columns:10, exc.toString())

                      button(text:'Go !', action:refresh)

               }

          }

          frame.pack()

          frame.show()

   }

   def refreshText(event)

   {

          rate = proxy.ConversionRate(swing.from.getSelectedItem(), swing.to.getSelectedItem())                               swing.currency.text = rate

          swing.exchange.text = rate*Double.parseDouble(swing.exchange.text)

   }

}



new TryIt().main()



       
 

Extract input tags from a web page

If you need to extract a specific html-tag from a web page you can do so:

       


@Grapes( @Grab('org.jsoup:jsoup:1.6.1')) 



import org.jsoup.Jsoup; 

import org.jsoup.nodes.Document;

import org.jsoup.nodes.Element;

import org.jsoup.select.Elements;



//Get a web page

Document doc = Jsoup.connect("https://biglietti.italotreno.it/Booking_Acquisto_Ricerca.aspx").get()

def results = doc.select("input") 



for (Element src : results) 

{

      if (src.tagName().equals("input"))

      {

             println("tag name: "+
                        src.tagName()+" id: "+src.attr("id")+" type: "+src.attr("type")+"                  name: "+ src.attr("name"));

      }

}
       
 

Simple Groovy Scheduler

How to write a simple scheduler in Groovy? Here you are:

       


      
class GroovyTimerTask extends TimerTask {

    Closure closure

    void run() 


    {

        closure()

    }

}



class TimerMethods 


{

    static TimerTask runEvery(Timer timer, long delay, 

    long period, Closure codeToRun) 

    {

        TimerTask task = new GroovyTimerTask(closure: codeToRun)

        timer.schedule task, delay, period

        task

    }

}



use (TimerMethods) 

{

    def timer = new Timer()

    def task = timer.runEvery(1000, 5000) 

    {

        println "Task executed at ${new Date()}."

    }

    println "Current date is ${new Date()}."

} 
 

Attetion: If you run this code as is, to stop the script you have to kill the GroovyConsole!