Generating QR Codes with ZXing

<dependency>

     <groupId>com.google.zxing</groupId>

     <artifactId>core</artifactId>

     <version>1.6</version>

</dependency>

<dependency>

     <groupId>com.google.zxing</groupId>

     <artifactId>javase</artifactId>

     <version>1.6</version>

</dependency>

Lets define an interface first. It is always a good idea to use interfaces when interacting with third-party components so that if you need to change the implementation altogether by using a different library, your change is isolated.

 

 

package co.syntx.examples.qr;

 

import java.io.OutputStream;

 

public interface IQRService {

 

        /**

        public abstract void generateQRCode(int width, int height, String content,

                        OutputStream outputStream) throws Exception;

 

Next, is the implementation of this interface.

 

 

package co.syntx.examples.qr;

 

import java.io.OutputStream;

 

 

import com.google.zxing.BarcodeFormat;

import com.google.zxing.client.j2se.MatrixToImageWriter;

import com.google.zxing.common.BitMatrix;

import com.google.zxing.qrcode.QRCodeWriter;

 

public class QRService implements IQRService {

 

        private static final String IMAGE_FORMAT = "png";

 

        /* (non-Javadoc)

        public void generateQRCode(int width, int height, String content, OutputStream outputStream) throws Exception {

            String imageFormat = IMAGE_FORMAT;

            BitMatrix bitMatrix = new QRCodeWriter().encode(content, BarcodeFormat.QR_CODE,width, height);

            MatrixToImageWriter.writeToStream(bitMatrix, imageFormat, outputStream);    

        }