How to Generate or Read QR code Dynamically using JAVA

This project is developer in zxing API.
1. Project Structure in Eclipse,

2. The 3 jars used are,
   1. zxing-core-2.0.jar
   2. zxing-1.7-javase.jar
   3. MySQL Connector
3. The below code will generate the QR code with data chillyfacts.com
   Create_QR.java

   
   package com.chillyfacts.com;
   import java.io.File;
   import java.util.HashMap;
   import java.util.Map;
   import com.google.zxing.BarcodeFormat;
   import com.google.zxing.EncodeHintType;
   import com.google.zxing.MultiFormatWriter; 
   import com.google.zxing.client.j2se.MatrixToImageWriter;
   import com.google.zxing.common.BitMatrix;
   import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
   public class Create_QR {
       public static void main(String[] args) {
           try {
               String qrCodeData = "www.chillyfacts.com";
               String filePath = "D:\\QRCODE\\chillyfacts.png";
               String charset = "UTF-8"; // or "ISO-8859-1"
               Map < EncodeHintType, ErrorCorrectionLevel > hintMap = new HashMap < EncodeHintType, ErrorCorrectionLevel > ();
               hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
               BitMatrix matrix = new MultiFormatWriter().encode(
                   new String(qrCodeData.getBytes(charset), charset),
                   BarcodeFormat.QR_CODE, 200, 200, hintMap);
               MatrixToImageWriter.writeToFile(matrix, filePath.substring(filePath
                   .lastIndexOf('.') + 1), new File(filePath));
               System.out.println("QR Code image created successfully!");
           } catch (Exception e) {
               System.err.println(e);
           }
       }
   }
   

4. Output of the above code,

5. Read_QR.java

   
   package com.chillyfacts.com;
   import java.io.FileInputStream;
   import java.io.FileNotFoundException;
   import java.io.IOException;
   import java.util.HashMap;
   import java.util.Map;
   import javax.imageio.ImageIO;
   import com.google.zxing.BinaryBitmap;
   import com.google.zxing.EncodeHintType;
   import com.google.zxing.MultiFormatReader;
   import com.google.zxing.NotFoundException;
   import com.google.zxing.Result;
   import com.google.zxing.WriterException;
   import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
   import com.google.zxing.common.HybridBinarizer;
   import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
   public class Read_QR {
       public static void main(String[] args) throws WriterException, IOException,
           NotFoundException {
               try {
                   String filePath = "D:\\QRCODE\\chillyfacts.png";
                   String charset = "UTF-8";
                   Map < EncodeHintType, ErrorCorrectionLevel > hintMap = new HashMap < EncodeHintType, ErrorCorrectionLevel > ();
                   hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
                   System.out.println("Data read from QR Code: " + readQRCode(filePath, charset, hintMap));
               } catch (Exception e) {
                   // TODO: handle exception
               }
           }
       public static String readQRCode(String filePath, String charset, Map hintMap)
       throws FileNotFoundException, IOException, NotFoundException {
           BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(
               new BufferedImageLuminanceSource(
                   ImageIO.read(new FileInputStream(filePath)))));
           Result qrCodeResult = new MultiFormatReader().decode(binaryBitmap, hintMap);
           return qrCodeResult.getText();
       }
   }
   

6. Out put of above code,

   Data read from QR Code: www.chillyfacts.com
   

7. Generate the QR code with data from MySQL database.
   DBConnection.java

   
   package com.chillyfacts.com;
   import java.sql.Connection;
   import java.sql.DriverManager;
   import java.sql.SQLException;
   public class DBConnection {        
   	public Connection getConnection(){          
   		Connection connection=null;                      
   		System.out.println("Connection called");                  
   		try {                                                                  
   			Class.forName("com.mysql.jdbc.Driver");              
   		connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root", "root");
   		} catch (ClassNotFoundException e) {
   			e.printStackTrace();
   		} catch (SQLException e) {
   			e.printStackTrace();
   		}
   		return connection;
   	}
   }
    
   

8. The below code will take Data from mysql table and create QR for for each link in mysql table.
   MySQL table data,

   Dyanamic_QR.java

   
   package com.chillyfacts.com;
   import java.io.File;
   import java.sql.Connection;
   import java.sql.ResultSet;
   import java.sql.Statement;
   import java.util.HashMap;
   import java.util.Map;
   import com.google.zxing.BarcodeFormat;
   import com.google.zxing.EncodeHintType;
   import com.google.zxing.MultiFormatWriter;
   import com.google.zxing.client.j2se.MatrixToImageWriter;
   import com.google.zxing.common.BitMatrix;
   import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
   public class Dyanamic_QR {
   	public static void main(String[] args) {
   		try {
   			DBConnection obj_DBConnection = new DBConnection();
               Connection connection = obj_DBConnection.getConnection();
               String query = "select * from links";
               Statement stmt = null;
               stmt = connection.createStatement();
               ResultSet rs = stmt.executeQuery(query);
               while (rs.next()) {
               	Dyanamic_QR.generate_qr(rs.getString("sl_no"),rs.getString("links"));
               }
   		} catch (Exception e) {
   			// TODO: handle exception
   		}
   	}
   	public static void generate_qr(String image_name,String qrCodeData) {
           try {
               String filePath = "D:\\QRCODE\\"+image_name+".png";
               String charset = "UTF-8"; // or "ISO-8859-1"
               Map < EncodeHintType, ErrorCorrectionLevel > hintMap = new HashMap < EncodeHintType, ErrorCorrectionLevel > ();
               hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
               BitMatrix matrix = new MultiFormatWriter().encode(
                   new String(qrCodeData.getBytes(charset), charset),
                   BarcodeFormat.QR_CODE, 200, 200, hintMap);
               MatrixToImageWriter.writeToFile(matrix, filePath.substring(filePath
                   .lastIndexOf('.') + 1), new File(filePath));
               System.out.println("QR Code image created successfully!");
           } catch (Exception e) {
               System.err.println(e);
           }
       }
   }
   

9. Output of Dynamic QR generated as per the data from MySQL Table

Download the source code.

QR_Write_Read.rar