Saturday, 4 November 2017

Get properties in AEM sling servlet

Usecase: I had a situation to fetch properties from node/page/cloud configurations from sling servlet. 

Issue: In wcmusepojo we can get these cloud configuarations using getInheritedPageProperties(). But inheritedPageProperties variable is not accessible in osgi service or sling servlet.

Solution:
To get properties of a node/page/cloud configurations from sling servlet do the following.
Below is sample servlet code.
/**
* Author: Kishore Polsani
*/
@Component(name = "com.kishore.aem.GetProperties", label = "Get Properties", immediate = true, metatype = true)
@Service
@Properties({ @Property(name = "service.description", value = "Get Properties"),
            @Property(name = "sling.servlet.paths", value = "/services/aemquickstart/getproperties", propertyPrivate = true),
            @Property(name = "service.vendor", value = "AEMQuickstart")
         })
    public class GetProperties extends SlingAllMethodsServlet implements Serializable {
        private static final long serialVersionUID = 1L;
        private Logger log = LoggerFactory.getLogger(GetProperties.class);
        
        @Reference
        protected SlingRepository repository;
        @Reference
        private ResourceResolverFactory resolverFactory;
        
        @Override
        protected void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException
                    {
                  
            try {
                Map<String, Object> param = new HashMap<String, Object>();  
                param.put(ResourceResolverFactory.SUBSERVICE, "readService");
                ResourceResolver resourceResolver=null;
                resourceResolver = resolverFactory.getServiceResourceResolver(param);
                /* Get this path from ajax call request*/
                Resource pageResource = resourceResolver.getResource("/etc/cloudservices/salesforce/kishore/jcr:content");
                Node configNode = pageResource.adaptTo(Node.class);
                configNode.getProperty("accesstoken");
                log.info("Access token from cloud config"+configNode.getProperty("accesstoken"));
                Session session = resourceResolver.adaptTo(Session.class);
                session.save();
            } catch (AccessDeniedException e) {
                log.error(e.getMessage());
            } catch (PathNotFoundException e) {
                log.error(e.getMessage());
            } catch (ItemExistsException e) {
                log.error(e.getMessage());
            } catch (ReferentialIntegrityException e) {
                log.error(e.getMessage());
            } catch (ConstraintViolationException e) {
                log.error(e.getMessage());
            } catch (InvalidItemStateException e) {
                log.error(e.getMessage());
            } catch (VersionException e) {
                log.error(e.getMessage());
            } catch (LockException e) {
                log.error(e.getMessage());
            } catch (NoSuchNodeTypeException e) {
                log.error(e.getMessage());
            } catch (LoginException e) {
                log.error(e.getMessage());
            } catch (RepositoryException e) {
                log.error(e.getMessage());
            }
        }   
}

Check this post to get properties in different way: Registering a Servlet for every Page in AEM

Sunday, 10 September 2017

Creating RTE in Multifield

Discusses how to develop an AEM HTML Template Language (HTL - formerly known as Sightly) component that uses the WCMUsePojo class and uses a Multifield (granite/ui/components/foundation/form/multifield) in the component dialog. This article also covers using the Experience Manager Uber 6.3 JAR.
HTL is the AEM template language that can be used to replace use of JSP when developing an AEM component. HTL helps you to separate your design from your application logic. For more information, see Introduction to the HTML Template Language.


Wednesday, 30 August 2017

Integrate AEM with React JS library

Introduction

React is a Javascript library developed solely for the purpose of UI designing. It was developed in Facebook to facilitate the implementation of reusable, interactive and stateful UI components. Facebook use this library in production. 
It carefully notes down the differences in in-memory cache and use these differences to update the DOM in browser, which is what gives him the boost. This is the Virtual DOM feature.


Wednesday, 23 August 2017

Validate JWT token and Secret Key

What is JSON Web Token?

JSON Web Token (JWT) is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. This information can be verified and trusted because it is digitally signed. JWTs can be signed using a secret (with the HMAC algorithm) or a public/private key pair using RSA.

When should you use JSON Web Tokens?

Here are some scenarios where JSON Web Tokens are useful:
  • Authentication: This is the most common scenario for using JWT. Once the user is logged in, each subsequent request will include the JWT, allowing the user to access routes, services, and resources that are permitted with that token. Single Sign On is a feature that widely uses JWT nowadays, because of its small overhead and its ability to be easily used across different domains.
  • Information Exchange: JSON Web Tokens are a good way of securely transmitting information between parties. Because JWTs can be signed—for example, using public/private key pairs—you can be sure the senders are who they say they are. Additionally, as the signature is calculated using the header and the payload, you can also verify that the content hasn't been tampered with.
Click here to learn more about JWT.

Sample Java code to validate JWT token and secret key.

Add below maven dependency to your pom.xml

Saturday, 19 August 2017

Install NodeJs

What is NodeJS

  • Node.js is an open source server framework
  • Node.js is free
  • Node.js runs on various platforms (Windows, Linux, Unix, Mac OS X, etc.)
  • Node.js uses JavaScript on the server

Click here to check Why Node.js

What is npm?

npm makes it easy for JavaScript developers to share and reuse code, and it makes it easy to update the code that you're sharing.
Click here to learn more on npm.

Install npm

Click here to download and install the npm on your machine.

Test if nodeJs is installed correctly, run below command.
npm -v
or 
npm --version
npm version

Start npm run start, if you get below error 
npm ERR! path C:\Users\Kishore\package.json
npm ERR! code ENOENT
npm ERR! errno -4058
npm ERR! syscall open
npm ERR! enoent ENOENT: no such file or directory, open 'C:\Users\Kishore\package.json'
npm ERR! enoent This is related to npm not being able to find a file.
npm ERR! enoent

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\Kishore\AppData\Roaming\npm-cache\_logs\2017-08-19T14_53_13_265Z-debug.log


You can avoid above error by following below

  • running the npm command from bin folder
  • set environment variables (~\bin)


Wednesday, 16 August 2017

Troubleshooting AEM 6.1 to AEM 6.2 upgradation

When we try to upgrade website developed on AEM 6.1 to AEM 6.2 we need to consider below points.

Update uber.jar version to 6.2.0

<dependency>
    <groupId>com.adobe.aem</groupId>
    <artifactId>uber-jar</artifactId>
    <version>6.2.0</version>
    <scope>provided</scope>
    <classifier>obfuscated-apis</classifier>
</dependency>

Issue 1:

When tried to build code we normally see below error message.
java.lang.NoClassDefFoundError: com/day/cq/commons/Externalizer

06.07.2017 09:55:54.242 *ERROR* [0:0:0:0:0:0:0:1 [1499331350444] GET /content/kishore/en/test.html HTTP/1.1] 
com.day.cq.wcm.core.impl.WCMDebugFilter Exception: com/day/cq/commons/Externalizer
java.lang.NoClassDefFoundError: com/day/cq/commons/Externalizer

Solution:
Fixed this issue by rebuilding the package with AEM 6.2 uber.jar

Issue 2:
Caused by: org.apache.sling.scripting.sightly.SightlyException: 
Cannot find a a file corresponding to class com.aem.kishore.HelloWorld in the repository.

Solution:

This issue is caused due to the Java version. Use the correct java version preferably Java 8.

Monday, 14 August 2017

Sling Resource API vs JCR API - Performance

Check the article to compare the performance when using Sling Resource API and JCR API.

This article illustrates different tests performed to compare the performance of sling resource api and jcr api.

Test 1: Traversing /content/geometrixx tree
Result: JCR API is roughly twice as fast as the Sling API when traversing a tree.

Test 2: Creating simple pages (single save)
When creating a 1000 simple pages and saving them in one go, it takes respectively 0.20 and 0.26 ms for the JCR and Sling API to create a single page. Creating 1000 pages took 200 and 260 ms respectively for JCR and Sling in total.






Saturday, 5 August 2017

Configuring Index Connector in Adobe Search & Promote


Why Index Connector?

Use Index Connector to define additional input sources for indexing XML pages or any kind of feed. Check how to integrate AEM with Search & Promote

You can use a data feed input source to access content that is stored in a form that is different from what is typically discovered on a website using one of the available crawl methods. However, a data feed either comes from an XML document or from a comma- or tab-delimited text file, and contains the content information to index.

Friday, 21 July 2017

Generic way to author text in AEM dialog

I am trying to author text in dialog, text contains dynamic values like name etc. I tried declaring sightly variable names in AEM dialog to fetch the data dynamically but it didn't work.



 I tried below approaches..

Approach 1:
/*
  * Using String format
  */
  String authoredText= "Hi %s, welcome to %s";
  authoredText = authoredText.format(authoredText,"Kishore","AEM Quickstart");
  log.info("---Using String format----\n"+authoredText);

Approach 2:
/*
  * Using StrSubstitutor - org.apache.commons.lang.text.StrSubstitutor
  */
  Map valuesMap = new HashMap();
  valuesMap.put("name", "Kishore");
  valuesMap.put("blog", "AEM Quickstart");
  String templateString = "Hi ${name}, welcome to ${blog}.";
  StrSubstitutor sub = new StrSubstitutor(valuesMap);
  String resolvedString = sub.replace(templateString);
  log.info("---Using StrSubstitutor----\n"+resolvedString);

Approach 3:
/**
   * Using String replace
   */
  String authoredText= "Hi ${name}, welcome to ${blog}";
  authoredText = authoredText.replace("${name}","Kishore");
  authoredText = authoredText.replace("${blog}","AEM Quickstart");
  log.info("---Using String replace----\n"+authoredText);

From above approaches we can author the text in any of the format and parse it in java and we can get the text in HTL.

org.osgi.framework.BundleException:osgi.wiring.package=com.adobe.cq.sightly

Sometimes when we try to deploy code, bundles may not be in active state in AEM 6.1. We can see below error message.

Error Message:
22.07.2017 10:40:27.509 *ERROR* [qtp2141213534-59] org.apache.felix.http.jetty %bundles.pluginTitle: Cannot start (org.osgi.framework.BundleException: Unresolved constraint in bundle com.aem.kishore.bundle-core [463]: Unable to resolve 463.2: missing requirement [463.2] osgi.wiring.package; (&(osgi.wiring.package=com.adobe.cq.sightly)(version>=2.2.0)(!(version>=3.0.0))))

org.osgi.framework.BundleException: Unresolved constraint in bundle com.aem.kishore.bundle-core[463]: Unable to resolve 463.2: missing requirement [463.2] osgi.wiring.package; (&(osgi.wiring.package=com.adobe.cq.sightly)(version>=2.2.0)(!(version>=3.0.0)))


Solution:
  • Delete existing bundle first.
  • Add below code in bundle pom.xml and rebuild the code.
<Import-Package>
    !org.apache.log.*,
    !org.apache.avalon.*
        -----------------------------
        -----------------------------
 </Import-Package>

Tuesday, 18 July 2017

org.osgi.framework.BundleException: osgi.wiring.package=com.adobe.cq.mcm.salesforce

Sometimes when we try to deploy code, bundles may not be in active state in AEM 6.1. We can see below error message.

Error Message:
18.07.2017 23:44:01.519 *ERROR* [qtp1756110899-265] org.apache.felix.http.jetty %bundles.pluginTitle: Cannot start (org.osgi.framework.BundleException: Unresolved constraint in bundle com.aem.kishore.bundle-core [654]: Unable to resolve 654.1: missing requirement [654.1] osgi.wiring.package; (&(osgi.wiring.package=com.adobe.cq.mcm.salesforce)(version>=1.1.0)(!(version>=2.0.0))))
org.osgi.framework.BundleException: Unresolved constraint in bundle com.aem.kishore.bundle-core [654]: Unable to resolve 654.1: missing requirement [654.1] osgi.wiring.package; (&(osgi.wiring.package=com.adobe.cq.mcm.salesforce)(version>=1.1.0)(!(version>=2.0.0)))

Solution:
  • Delete (or stop) the ''org.eclipse.equinox.region" bundle from the felix.
  • Delete the existing custom bundle.
  • Restart the server (check without restarting) and then redeploy your code bundle.
This bundle has some dependency with eclipse and should not be in AEM6.1, it was meant for AEM 6.2. But somehow it got introduced in this version.

If still issue is not resolved check this post.

Tuesday, 11 July 2017

java.lang.NoClassDefFoundError: com/day/cq/commons/Externalizer

I have developed a website using AEM 6.1 API. In some piece of java code I used the Externalizer class from AEM (com.day.cq.commons). This piece of code worked fine in 6.1 aem instance. When tried to deploy on AEM 6.2 got below error.


06.07.2017 09:55:54.242 *ERROR* [0:0:0:0:0:0:0:1 [1499331350444] GET /content/kishore/en/test.html HTTP/1.1] 
com.day.cq.wcm.core.impl.WCMDebugFilter Exception: com/day/cq/commons/Externalizer
java.lang.NoClassDefFoundError: com/day/cq/commons/Externalizer


Solution:

Fixed this issue by rebuilding the package with AEM 6.2 uber.jar

AEM Repository Size Growing Rapidly

Sometimes we observe AEM repository size increase rapidly. Check how to compact repository size.

AEM Repository Compaction

  • Create new folder compact and place oak-run-1.2.2.jar and below .bat file.
  • Create a .bat file containing below code

java -jar oak-run-1.2.2.jar compact C:\Users\Kishore\AEM\crx-quickstart\repository\segmentstore

Download oak-run-1.2.2.jar

Tuesday, 4 July 2017

Currency converter service

I am attaching simple program about, How to write Simple Currency Converter using Java Program. The program was written using Fixer Currency Converter Webservice. In this example, I am using Gson 2.8.0 API to convert JSON to Object in Java. you can download API from here.

CurrencyConversionResponse.java

package com.kishore.generic;

import java.util.Map;
import java.util.TreeMap;

public class CurrencyConversionResponse {

    private String base;
    private String date;

    private Map<String, String> rates = new TreeMap<String, String>();

    public Map<String, String> getRates() {
        return rates;
    }

    public void setRates(Map<String, String> rates) {
        this.rates = rates;
    }

    public String getBase() {
        return base;
    }

    public void setBase(String base) {
        this.base = base;
    }

    public String getDate() {
        return date;
    }

    public void setDate(String date) {
        this.date = date;
    }

}

CurrencyConvertor.java

package com.kishore.generic;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Scanner;

import com.google.gson.Gson;

public class CurrencyConvertor {

    // API Provider URL
    private static final String API_PROVDIER = "http://api.fixer.io/";

    public static double convert(String fromCurrencyCode, String toCurrencyCode) {

        if ((fromCurrencyCode != null && !fromCurrencyCode.isEmpty())
                && (toCurrencyCode != null && !toCurrencyCode.isEmpty())) {

            CurrencyConversionResponse response = getResponse(API_PROVDIER
                    + "/latest?base=" + fromCurrencyCode);

            if (response != null) {

                String rate = response.getRates().get(toCurrencyCode);

                double conversionRate = Double.valueOf((rate != null) ? rate: "0.0");

                return conversionRate;
            }

        }

        return 0.0;
    }

    // Method to get the response from API
    private static CurrencyConversionResponse getResponse(String strUrl) {

        CurrencyConversionResponse response = null;

        Gson gson = new Gson();
        StringBuffer sb = new StringBuffer();

        if (strUrl == null || strUrl.isEmpty()) {

            System.out.println("Application Error");
            return null;
        }

        URL url;
        try {
            url = new URL(strUrl);

            HttpURLConnection connection = (HttpURLConnection) url
                    .openConnection();

            InputStream stream = connection.getInputStream();

            int data = stream.read();

            while (data != -1) {

                sb.append((char) data);

                data = stream.read();
            }

            stream.close();

            response = gson.fromJson(sb.toString(),
                    CurrencyConversionResponse.class);

        } catch (MalformedURLException e) {

            System.out.println(e.getMessage());
            e.printStackTrace();

        } catch (IOException e) {

            System.out.println(e.getMessage());
            e.printStackTrace();
        }

        return response;
    }

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

        Scanner scanner = new Scanner(System.in);

        System.out.println("What is your currency code ?");
        String fromCurrencyCode = scanner.next();

        System.out.println("Enter the Amount :");
        double amount = scanner.nextDouble();

        System.out
                .println("Enter the Currency Code that you want to covert : ");
        String toCurrencyCode = scanner.next();

        fromCurrencyCode = fromCurrencyCode.toUpperCase();
        toCurrencyCode = toCurrencyCode.toUpperCase();

        // Currency Conversion
        double coversionRate = convert(fromCurrencyCode, toCurrencyCode);

        System.out.println("Hi, The " + amount + " " + fromCurrencyCode
                + " is equivalent to " + (coversionRate * amount) + " "
                + toCurrencyCode + " today.");

        scanner.close();
    }

}

Output

What is your currency code ?
USD
Enter the Amount :
1
Enter the Currency Code that you want to covert : 
GBP
Hi, The 1.0 USD is equivalent to 0.77341 GBP today.



Monday, 3 July 2017

Java code to format date

Sample code to format date
package com.kishore.samples;

import java.text.SimpleDateFormat;
import java.util.Date;

/**
 *
 * Java program to show how to format date in Java using SimpleDateFormat
 * Examples. Java allows to include date, time and timezone information
 * while formatting dates in Java.
 *
 */
public class DateFormatExample {

    public static void main(String args[]) {
      
        // This is how to get today's date in Java
        Date today = new Date();
      
        //If you print Date, you will get un formatted output
        System.out.println("Today is : " + today);
      
        //formatting date in Java using SimpleDateFormat
        SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("dd-MM-yyyy");
        String date = DATE_FORMAT.format(today);
        System.out.println("Today in dd-MM-yyyy format : " + date);
      
        //Another Example of formatting Date in Java using SimpleDateFormat
        DATE_FORMAT = new SimpleDateFormat("dd/MM/yy");
        date = DATE_FORMAT.format(today);
        System.out.println("Today in dd/MM/yy pattern : " + date);
      
        //formatting Date with time information
        DATE_FORMAT = new SimpleDateFormat("dd-MM-yy:HH:mm:SS");
        date = DATE_FORMAT.format(today);
        System.out.println("Today in dd-MM-yy:HH:mm:SS : " + date);
      
        //SimpleDateFormat example - Date with timezone information
        DATE_FORMAT = new SimpleDateFormat("dd-MM-yy:HH:mm:SS Z");
        date = DATE_FORMAT.format(today);
        System.out.println("Today in dd-MM-yy:HH:mm:SSZ : " + date);      
    }   
}

Output:

Today is : Mon Jul 03 23:16:17 IST 2017
Today in dd-MM-yyyy format : 03-07-2017
Today in dd/MM/yy pattern : 03/07/17
Today in dd-MM-yy:HH:mm:SS : 03-07-17:23:16:95
Today in dd-MM-yy:HH:mm:SSZ : 03-07-17:23:16:95 +0530

Format currency in Java

Sample code to format currency in java
package com.kishore.samples;

import java.text.NumberFormat;
import java.util.Locale;

/**
 * * How to format Number to different currency in Java. Following Java program
 * * will show you, how you can display double value in different currency e.g.
 * * USD, GBP and JPY. This example show price in multiple currency. 
 */
public class CurrencyFormater {
    public static void main(String args[]) {
        double price = 100.25;
        showPriceInUSD(price, getExchangeRate("USD"));
        showPriceInGBP(price, getExchangeRate("GBP"));
        showPriceInJPY(price, getExchangeRate("JPY"));
    }

    /** * Display price in US Dollar currency * * @param price * @param rate */
    public static void showPriceInUSD(double price, double rate) {
        double priceInUSD = price * rate;
        NumberFormat currencyFormat = NumberFormat
                .getCurrencyInstance(Locale.US);
        System.out.printf("Price in USD : %s %n",
                currencyFormat.format(priceInUSD));
    }

    /** * Display prince in British Pound * * @param price * @param rate */
    public static void showPriceInGBP(double price, double rate) {
        double princeInGBP = price * rate;
        NumberFormat GBP = NumberFormat.getCurrencyInstance(Locale.UK);
        System.out.printf("Price in GBP : %s %n", GBP.format(princeInGBP));
    }

    /** * Display prince in Japanese Yen * * @param price * @param rate */
    public static void showPriceInJPY(double price, double rate) {
        double princeInJPY = price * rate;
        NumberFormat currency = NumberFormat.getCurrencyInstance(Locale.JAPAN);
        System.out.printf("Price in JPY : %s %n", currency.format(princeInJPY));
    }

    /** * @return FX exchange rate for USD * @param currency */
    public static double getExchangeRate(String currency) {
        switch (currency) {
        case "USD":
            return 1;
        case "JPY":
            return 102.53;
        case "GBP":
            return 0.60;
        case "EURO":
            return 0.73;
        default:
            throw new IllegalArgumentException(String.format(
                    "No rates available for currency %s %n", currency));
        }
    }
}

Output:

Price in USD : $100.25 
Price in GBP : £60.15 
Price in JPY : ?10,279 


Display number in different number patterns with locale

Sample code to display numbers in different pattern with locale like en_US
package com.kishore.samples;

import java.util.*;
import java.text.*;
 
public class DecimalFormatDemo {
 
   static public void customFormat(String pattern, double value ) {
      DecimalFormat myFormatter = new DecimalFormat(pattern);
      String output = myFormatter.format(value);
      System.out.println(value + " ===> " + pattern + " ===> " + output);
   }
 
   static public void localizedFormat(String pattern, double value, 
                                      Locale loc ) {
      NumberFormat nf = NumberFormat.getNumberInstance(loc);
      DecimalFormat df = (DecimalFormat)nf;
      df.applyPattern(pattern);
      String output = df.format(value);
      System.out.println(pattern + " ===> " + output + " ===> " + loc.toString());
   }
 
   static public void main(String[] args) {
       System.out.println("Number formats without Locale");
      customFormat("###,###.###", 123456.789);
      customFormat("###.##", 123456.789);
      customFormat("000000.000", 123.78);
      customFormat("$###,###.###", 12345.67);
      customFormat("\u00a5###,###.###", 12345.67);
 
      Locale currentLocale = new Locale("en", "US");
 
      DecimalFormatSymbols unusualSymbols = 
         new DecimalFormatSymbols(currentLocale);
      unusualSymbols.setDecimalSeparator('|');
      unusualSymbols.setGroupingSeparator('^');
      String strange = "#,##0.###";
      DecimalFormat weirdFormatter = new DecimalFormat(strange, unusualSymbols);
      weirdFormatter.setGroupingSize(4);
      String bizarre = weirdFormatter.format(12345.678);
      System.out.println(bizarre);
 
      Locale[] locales = {
         new Locale("en", "US"),
         new Locale("de", "DE"),
         new Locale("fr", "FR")
      };
      System.out.println("Number formats with Locale");
      for (int i = 0; i < locales.length; i++) {
         localizedFormat("###,###.###", 123456.789, locales[i]);
      }
 
   }
}

Output:

Number formats without Locale
123456.789 ===> ###,###.### ===> 123,456.789
123456.789 ===> ###.## ===> 123456.79
123.78 ===> 000000.000 ===> 000123.780
12345.67 ===> $###,###.### ===> $12,345.67
12345.67 ===> ¥###,###.### ===> ¥12,345.67
1^2345|678
Number formats with Locale
###,###.### ===> 123,456.789 ===> en_US
###,###.### ===> 123.456,789 ===> de_DE
###,###.### ===> 123 456,789 ===> fr_FR

Reference:
https://docs.oracle.com/javase/tutorial/i18n/format/decimalFormat.html

Display number in different number patterns

You can use the java.text.DecimalFormat class to control the display of leading and trailing zeros, prefixes and suffixes, grouping (thousands) separators, and the decimal separator. DecimalFormat offers a great deal of flexibility in the formatting of numbers, but it can make your code more complex.
The example that follows creates a DecimalFormat object, myFormatter, by passing a pattern string to the DecimalFormat constructor. The format() method, which DecimalFormat inherits from NumberFormat, is then invoked by myFormatter—it accepts a double value as an argument and returns the formatted number in a string:
Here is a sample program that illustrates the use of DecimalFormat:
import java.text.*;

public class DecimalFormatDemo {

   static public void customFormat(String pattern, double value ) {
      DecimalFormat myFormatter = new DecimalFormat(pattern);
      String output = myFormatter.format(value);
      System.out.println(value + " ===> " + pattern + " ===> " + output);
   }

   static public void main(String[] args) {

      customFormat("###,###.###", 123456.789);
      customFormat("###.##", 123456.789);
      customFormat("000000.000", 123.78);
      customFormat("$###,###.###", 12345.67);  
   }
}

The output is:
123456.789 ===> ###,###.### ===> 123,456.789
123456.789 ===> ###.## ===> 123456.79
123.78 ===> 000000.000 ===> 000123.780
12345.67 ===> $###,###.### ===> $12,345.67

Reference: