Bar code scan and generate in xpages

Question

I need to use barcodes in an xpages application, both to generate the barcode and to read it. Does anyone know of any libraries I can use on the application? Has anyone used these features in a xpages application? How do I find out the barcode pattern?

Answer 1

I am using ZXing for creating and reading different types of barcodes. For Java 6 there is an older version available: Solvoj ZXing

EDIT:

1. Import http://central.maven.org/maven2/com/solvoj/zxing-java6/core-java6/3.2.0/core-java6-3.2.0.jar
2. Import http://central.maven.org/maven2/com/solvoj/zxing-java6/javase-java6/3.2.0/javase-java6-3.2.0.jar
3. Create a managed bean
4. Add the bean to your XPage

Managed Bean

package ch.hasselba.xpages;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

import javax.faces.context.FacesContext;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageConfig;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.ibm.xsp.webapp.XspHttpServletResponse;

public class ZXingBean {

    public void generateDemoQRCode() {
        FacesContext fc = FacesContext.getCurrentInstance();
        XspHttpServletResponse  response = (XspHttpServletResponse) fc.getExternalContext().getResponse();

        try {
            response.setContentType("image/png");
            response.getOutputStream().write(generateQRCode("Hello World!", 200, 200 ));
        } catch (IOException e) {
            e.printStackTrace();
        } catch (WriterException e) {
            e.printStackTrace();
        }

        fc.responseComplete();

    }
    public byte[] generateQRCode(String text, int width, int height)
            throws WriterException, IOException {

        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        BitMatrix matrix = new MultiFormatWriter().encode(text,
                BarcodeFormat.QR_CODE, width, height);

        MatrixToImageWriter.writeToStream(matrix, "png", baos,
                new MatrixToImageConfig());

        return baos.toByteArray();
    }

}

faces-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<faces-config>
  <managed-bean>
    <managed-bean-name>zxingBean</managed-bean-name>
    <managed-bean-class>ch.hasselba.xpages.ZXingBean</managed-bean-class>
    <managed-bean-scope>session</managed-bean-scope>
  </managed-bean>
</faces-config>

XAgent

<xp:view
    xmlns:xp="http://www.ibm.com/xsp/core"
    rendered="false"
    viewState="nostate">
    <xp:this.beforeRenderResponse><![CDATA[#{javascript:zxingBean.generateDemoQRCode()}]]></xp:this.beforeRenderResponse>

</xp:view>