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June 14, 2019 03:41
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[QR Code in Java] #Java #JavaLib
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import java.io.File; | |
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.BarcodeFormat; | |
import com.google.zxing.BinaryBitmap; | |
import com.google.zxing.EncodeHintType; | |
import com.google.zxing.MultiFormatReader; | |
import com.google.zxing.MultiFormatWriter; | |
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.client.j2se.MatrixToImageWriter; | |
import com.google.zxing.common.BitMatrix; | |
import com.google.zxing.common.HybridBinarizer; | |
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel; | |
public class QRCode { | |
public static void main(String[] args) throws WriterException, IOException, | |
NotFoundException { | |
String qrCodeData = "Hello World!"; | |
String filePath = "QRCode.png"; | |
String charset = "UTF-8"; // or "ISO-8859-1" | |
Map hintMap = new HashMap(); | |
hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L); | |
createQRCode(qrCodeData, filePath, charset, hintMap, 200, 200); | |
System.out.println("QR Code image created successfully!"); | |
System.out.println("Data read from QR Code: " | |
+ readQRCode(filePath, charset, hintMap)); | |
} | |
public static void createQRCode(String qrCodeData, String filePath, | |
String charset, Map hintMap, int qrCodeheight, int qrCodewidth) | |
throws WriterException, IOException { | |
BitMatrix matrix = new MultiFormatWriter().encode( | |
new String(qrCodeData.getBytes(charset), charset), | |
BarcodeFormat.QR_CODE, qrCodewidth, qrCodeheight, hintMap); | |
MatrixToImageWriter.writeToFile(matrix, filePath.substring(filePath | |
.lastIndexOf('.') + 1), new File(filePath)); | |
} | |
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(); | |
} | |
} |
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