UPC-A is also known as Universal Product Code version A, UPC-A Supplement 5/Five-digit Add-On, UPC-A Supplement 2/Two-digit Add-On, UPC-A+5, UPC-A+2, UPC Code, UPC Symbol, GTIN-12, GS1-12, UCC-12

UPC-A is used for marking products which are sold at retail in the USA. The barcode identifies the manufacturer and specific product so point-of- sale cash register systems can automatically look up the price.
The UPC-A Code and the assignment of manufacturer ID numbers is controlled in the U.S.A. by the Uniform Code Council (UCC).

Sample of a UPC-A Barcode

The value to encode by UPC-A has the following structure:

1 digit for Number System (0: regular UPC codes, 1: reserved, 2: random weight items marked at the store, 3: National Drug Code and National Health Related Items code, 4: no format restrictions, for in-store use on non-food items, 5: for use on coupons, 6: reserved, 7: regular UPC codes, 8: reserved, 9: reserved)
5 digits for Manufacturer (Company) Code or prefix. This number is assigned by the Uniform Code Council (UCC)
5 digits for Product Code which is assigned by the manufacturer
1 digit for checksum

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-A Two-Digit Add-On Barcode

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

2. UPC-A Encoding Data Scope

UPCA Barcode for Java supports.

0, 1, 2, 3, 4, 5, 6, 7, 8, 9

3. How to Generate UPC-A Barcode in Java Class?

The following Java code illustrates how to create a UPC-A barcode, and output to various formats

1            Linear linear = new Linear(); 
2            linear.setType(Linear.UPCA); 
3            linear.setData("01234567890"); 
4            linear.renderBarcode("c:/barcode.gif"); 
	
5            BufferedImage bufferedImage = linear.renderBarcode();

6            byte[] barcodeBytes = linear.renderBarcodeToBytes();

7            Graphics2D g = ...
8            Rectangle2D rectangle = ... 
9            linear.renderBarcode(g, rectangle);

10           OutputStream outputStream = ...
11           linear.renderBarcode(outputStream);

Create a Linear barcode object (line 1)
Set Linear object barcode type to UPC-A (line 2)
Set UPC-A barcode data to encode (line 3)
Encode generated UPC-A barcode into gif image file (line 4)
Generate UPC-A and output to BufferedImage object (line 5)
Generate UPC-A in bitmap and output to byte[] (line 6)
Generate UPC-A and draw to defined area (Rectangle2D) on Graphics2D (line 7-9)
Generate UPC-A and output to OutputStream (line 10-11)

4. How to Generate UPC-A Barcode Image in Java Web Applications?

There are two methods to create UPC-A barcode images in your Java web applications.

The simplest way is to stream barcode image using our buildin barcode servlet application.
- Download the Barcode for Java Trial Package, and unzip it.
- Under java_barcode_trial package, copy barcode folder to your java servlet container like tomcat.
- Restart tomcat. Now you have installed successfully.
- To test your installation, open your web browser and navigate to
  http://YourDomain:Port/barcode/linear?Data=01234567890&Type=UPCA
- To create barcode image in your JSP or html page, you need pass the url to IMG tag src value. For example,
  <img src="http://YourDomain:Port/barcode/linear?Data=01234567890&Type=UPCA" />
  
  Using this method, it will not generate any barcode images in your server side.
The second method is to generate barcode images in your server side
- Create a barcode image in server side
```
1            Linear linear = new Linear(); 
2            linear.setData("01234567890"); 
3            linear.setType(Linear.UPCA); 
4            linear.renderBarcode("C:/Tools/Tomcat 5.5/webapps/YourWebApp/barcode-images/barcode.gif"); 
```
- In your JSP or HTML page, you need use IMG tag to display generated image, like
  <img src="http://YourDomain:Port/YourWebApp/barcode-images/barcode.gif" />

5. How to Generate Barcode UPC-A Image in Jasper Reports, iReport, Eclipse BIRT?

6. Java UPC-A Barcode Property Settings

Set the type property to Linear.UPCA, or Linear.UPCA_2, or Linear.UPCA_5
Servlet URL Parameter: "Type". Value: 40 (UPCA), 41 (UPCA +2), 42 (UPCA +5). Sample: &Type=40
Set the data property with the value to encode.
Type is String.
- Valid Data Scope:
  - 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
- Valid Data Format: 11 digits, and DO NOT include last digit checksum character.
- Sample: "12345678901"
Servlet URL Parameter: Data.
Set the sData property with the supplement value to encode. Type is String.
User should only provide 2 digits for UPCA_2, and provide only 5 digits for UPCA_5.
Servlet URL Parameter: SData.
addCheckSum property is not applied here. Barcode Library will always add a check character in the last digit (modulo 10).
Barcode image size settings:
- Set property uom (Unit of Measure) for properties X, Y, leftMargin, rightMargin, topMargin and bottomMargin.
  Default is Linear.UOM_PIXEL (0). Valid values are Linear.UOM_PIXEL (0), Linear.UOM_CM (1), Linear.UOM_Inch (2).
  Servlet URL Parameter: "UOM". Value: 0 (pixel), 1 (cm), 2 (inch). Sample: &UOM=0
- Set the X (for barcode module width) and Y (for barcode module height) properties.
  Both types are float. Default X is 3. Y is 75.
  Servlet URL Parameter: "X", "Y". Sample: &X=3&Y=75
- Set the leftMargin, rightMargin, topMargin and bottomMargin properties, and types are all float.
  Default values are 0 for all 4 margin settings.
  Servlet URL Parameter: "LeftMargin", "RightMargin", "TopMargin", "BottomMargin". Sample: &LeftMargin=0
- Set the resolution property (Value is expressed in DPI - Dots per inch).
  Default is 72 dpi.
  Servlet URL Parameter: "Resolution". Sample: &Resolution=72
Setting up text style in barcode image:
- Set the showText properties. If this value is true, barcode data will be displayed with the barcode.
  Default is true.
  Servlet URL Parameter: "ShowText". Value: "t" (true), "f" (false). Sample: &ShowText=t
- Set the textFont property. The font used to display text in barcode image.
  Default is new Font("Arial", Font.PLAIN, 11).
  Servlet URL Parameter: "TextFont". Value format: [font name]|[font style]|[font size]. Sample Values: &TextFont=Arial|Bold|12
With rotate property, you can display barcode horizontally or vertically.
Value can be
- 0 (Linear.ANGLE_0),
- 1 (Linear.ANGLE_90),
- 2 (Linear.ANGLE_180),
- 3 (Linear.ANGLE_270)
Default value is 0.
Servlet URL Parameter: "Rotate". Sample: &Rotate=0

7. How to Set Generated UPC-A Barcode Image Size?

Details for barcode size settings using Java barcode generator

All Java Barcode Types/Symbologies

Codabar
Code 11
Code 2 of 5
Code 39
Code 93
EAN 8
EAN 13
ISBN
ISSN
ITF14
Interleaved 2 of 5

Identcode
Leitcode
Code 128
GS1-128 / EAN-128
MSI
Onecode
PLANET
POSTNET
RM4SCC (British Royal Mail 4-State Customer Barcode)
UPC-A
UPC-E

Data Matrix
PDF-417
QR-Code