UPC-E is a variation of UPC-A which allows for a more compact barcode by eliminating "extra" zeros.
Since the resulting UPC-E barcode is about half the size as an UPC-A barcode, UPC-E is generally used on products with very small packaging where a full UPC-A barcode couldn't reasonably fit.
A UPC-E barcode represents 6 digits with an implied number system 0. However, a Number System 1 can be used as well.

Sample of a UPC-E Barcode with Data property = "123450", and UPCENumberSystem = 0.

The data displayed by UPC-E barcode image has the following structure:

• 1 digit for Number System (0 or 1), set through UPCENumberSystem property
• 6 digits for UPCE data set through Data property
• 1 digit for checksum, calculated automatically by barcode library.

Add-On or Supplement code

The Add-On Symbols were designed to encode information supplementary to that in the main bar code symbol on periodicals and paperback books. The Add-On can be composed of 2 or 5 digits only.

Sample of an UPC-E Two-Digit Add-On Barcode

Sample of an UPC-E Five-Digit Add-On Barcode

The following code illustrates how to create a barcode in a Java class

1            Barcode barcode = new Barcode(); 
2            barcode.setData("123456789"); 
3            barcode.setType(Barcode.CODE39); 
4            barcode.createBarcodeImage("c:/code39.gif"); 

• Create a Barcode object (line 1)
• set Barcode object properties (line 2 - 3)
• save into gif file (line 4)

There are two ways to create barcode images in your Java web applications.

1. This is the simplest way to stream barcode image using our provided barcode servlet classes.
   
   And it will not save barcode images in your server side.
   
   
   • Under demo package, copy barcode folder to your java servlet container like tomcat.
     
     
   • To test your installation, goto http://YourDomain:Port/barcode/barcode?Data=123456789&Type=CODE39
     
     
   • To create barcode image in your JSP page, you can pass the url to IMG tag src value. For example, <img src="http://YourDomain:Port/barcode/barcode?Data=123456789&Type=CODE39" />
     
     
2. The second method is similar with the way to generate barcode in Java applications.
   
   
   • Create a barcode image in server side

     1            Barcode barcode = new Barcode(); 
     2            barcode.setData("123456789"); 
     3            barcode.setType(Barcode.CODE39); 
     4            barcode.createBarcodeImage("C:/Tools/Tomcat 5.5/webapps/YourWebApp/bimages/code39.gif"); 
     
     
     

   • In your JSP page, you can using IMG tag to display generated image, like <img src="http://YourDomain:Port/YourWebApp/bimages/code39.gif" />

The following jasper xml content illustrates how to insert a barcode into JasperReports

<import value="com.barcodelib.barcode.BarcodeFactory"/> 

Import class BarcodeFactory to report.

<image scaleImage="Clip" hAlign="Center"> 
    <reportElement x="50" y="110" width="515" height="120"/> 
    <graphicElement/> 
    <imageExpression class="net.sf.jasperreports.engine.JRRenderable">
     <![CDATA[new com.barcodelib.barcode.BarcodeJasperRenderer(BarcodeFactory.createLinear(13, "0470821632"))]]></imageExpression> 
</image>

Please go to class BarcodeFactory in Java doc for all methods to create linear barcode.

Developers also can extend BarcodeFactory class to meet their own requirements. Complete BarcodeFactory.java Source Code