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Generate & Recognize Barcodes from PDF Documents in Java Applications

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Submitted on: 2/8/2012 3:06:01 PM
By: aspose_seo 
Level: Intermediate
User Rating: Unrated
Compatibility: Java (JDK 1.3), Java (JDK 1.4), Java (JDK 1.5)
Views: 4056
 
     This technical tip shows how we can use Aspose.Pdf for Java to recognize barcodes from PDF documents.


 
 
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This technical tip shows how we can use Aspose.Pdf for Java to recognize barcodes from PDF documents.  First, we will use Aspose.BarCode for Java and generate a barcode image. We will save this image to a file on disk. Then, we will use Aspose.Pdf for Java to create Adobe PDF document and insert this barcode in that document. For the recognition part, we will first extract images from the PDF document using Aspose.Pdf.Kit for Java. Once images are extracted, we will pass these images to Aspose.BarCode for Java for barcode recognition. Below is the complete java program to generate and recognize barcodes from Adobe PDF documents:

[Java]

import com.aspose.barcode.*;
import com.aspose.barcoderecognition.BarCodeReadType;
import com.aspose.barcoderecognition.BarCodeReader;
import com.aspose.pdf.elements.Pdf;
import com.aspose.pdf.elements.Section;
import com.aspose.pdf.kit.License;
import com.aspose.pdf.kit.PdfExtractor;
import java.awt.Toolkit;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

public class RecognitionFromPdf
{
    public static void main(String[] args)
    {
        try
        {
            // set license
            License licPdfKit = new License();
            FileInputStream stream = new FileInputStream("AsposeLicense.lic");
            licPdfKit.setLicense(stream);

            com.aspose.barcode.License licBarCode = new com.aspose.barcode.License();
            licBarCode.setLicense("AsposeLicense.lic");

            String strPdfDoc = " output1.pdf";
            String strBarCodeImage = "";

            // generate barcode and add to pdf file
            BarCodeBuilder builder = new BarCodeBuilder();
            builder.setSymbologyType(Symbology.Code39Standard);
            builder.setCodeText("test-123");
            String strBarCodeImageSave = " img.jpg";
            builder.save(strBarCodeImageSave);
            //Instantiate a Pdf object by calling its empty constructor
            Pdf pdf1 = new Pdf();
            //Create a section in the Pdf object
            Section sec1 = pdf1.getSections().add();
            //Create an image object in the section
            com.aspose.pdf.elements.Image img1 = new com.aspose.pdf.elements.Image(sec1);
            //Add image object into the Paragraphs collection of the section
            sec1.getParagraphs().add(img1);
            //Set the path of image file
            img1.getImageInfo().setFile(strBarCodeImageSave);
            img1.getImageInfo().setTitle("JPEG image");
            //Save the Pdf
            FileOutputStream out = new FileOutputStream(new File(strPdfDoc));
            pdf1.save(out);

            //Instantiate PdfExtractor object
            PdfExtractor extractor = new PdfExtractor();

            //Bind the input PDF document to extractor
            extractor.bindPdf(strPdfDoc);

            //Extract images from the input PDF document
            extractor.extractImage();
            String suffix = ".jpg";
            int imageCount = 1;
            while (extractor.hasNextImage()) {
                System.out.println("Extracting image " + imageCount);
                strBarCodeImage = "tmpbarcode" + imageCount + suffix;
                extractor.getNextImage(strBarCodeImage);

                // recognize barcode from image
                BarCodeReader reader = new BarCodeReader(strBarCodeImage,BarCodeReadType.getCode39Standard());
                while (reader.read())
                {
                    System.out.println("codetext: " + reader.getCodeText());
                }
                imageCount++;
                reader.close();
            }
        }
        catch(Exception ex)
        {
            System.out.println(ex.getMessage());
        }
    }
}

More about Aspose.BarCode for Java

  • Homepage of Aspose.BarCode for Java
  • Read more Technical Tips by Aspose.BarCode
  • Download of Aspose.BarCode for Java

Contact Information

Aspose Pty Ltd
Suite 163, 79 Longueville Road
Lane Cove, NSW, 2066
Australia
Aspose - Your File Format Experts
sales@aspose.com

Phone: 888.277.6734
Fax: 866.810.9465


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