转自搜到的帖子
代码如下:
package crunchify.com.tutorial; import java.awt.Color; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.util.EnumMap; import java.util.Map; import javax.imageio.ImageIO; import com.google.zxing.BarcodeFormat; import com.google.zxing.EncodeHintType; import com.google.zxing.WriterException; import com.google.zxing.common.BitMatrix; import com.google.zxing.qrcode.QRCodeWriter; import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel; /** * @author Crunchify.com * Updated: 03/20/2016 - added code to narrow border size */ public class CrunchifyQRCode { // Tutorial: http://zxing.github.io/zxing/apidocs/index.html public static void main(String[] args) { String myCodeText = "http://crunchify.com/"; String filePath = "/Users/appshah/Documents/CrunchifyQR.png"; int size = 250; String fileType = "png"; File myFile = new File(filePath); try { Map<EncodeHintType, Object> hintMap = new EnumMap<EncodeHintType, Object>(EncodeHintType.class); hintMap.put(EncodeHintType.CHARACTER_SET, "UTF-8"); // Now with zxing version 3.2.1 you could change border size (white border size to just 1) hintMap.put(EncodeHintType.MARGIN, 1); /* default = 4 */ hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L); QRCodeWriter qrCodeWriter = new QRCodeWriter(); BitMatrix byteMatrix = qrCodeWriter.encode(myCodeText, BarcodeFormat.QR_CODE, size, size, hintMap); int CrunchifyWidth = byteMatrix.getWidth(); BufferedImage image = new BufferedImage(CrunchifyWidth, CrunchifyWidth, BufferedImage.TYPE_INT_RGB); image.createGraphics(); Graphics2D graphics = (Graphics2D) image.getGraphics(); graphics.setColor(Color.WHITE); graphics.fillRect(0, 0, CrunchifyWidth, CrunchifyWidth); graphics.setColor(Color.BLACK); for (int i = 0; i < CrunchifyWidth; i++) { for (int j = 0; j < CrunchifyWidth; j++) { if (byteMatrix.get(i, j)) { graphics.fillRect(i, j, 1, 1); } } } ImageIO.write(image, fileType, myFile); } catch (WriterException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } System.out.println("\n\nYou have successfully created QR Code."); } }
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