Java implements the encoding and decoding of QR code QRCode
Some of the main class libraries involved are convenient for everyone to download:
Encoding lib: Qrcode_swetake.jar (Official website introduction - - http://www.swetake.com/qr/index-e.html) through
##【1】Encoding: Java code QRCodeEncoderHandler.javapackage michael.qrcode; import java.awt.Color; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.File; import javax.imageio.ImageIO; import com.swetake.util.Qrcode; /** * 二维码生成器 * @blog http://sjsky.iteye.com * @author Michael */ public class QRCodeEncoderHandler { /** * 生成二维码(QRCode)图片 * @param content * @param imgPath */ public void encoderQRCode(String content, String imgPath) { try { Qrcode qrcodeHandler = new Qrcode(); qrcodeHandler.setQrcodeErrorCorrect('M'); qrcodeHandler.setQrcodeEncodeMode('B'); qrcodeHandler.setQrcodeVersion(7); System.out.println(content); byte[] contentBytes = content.getBytes("gb2312"); BufferedImage bufImg = new BufferedImage(140, 140, BufferedImage.TYPE_INT_RGB); Graphics2D gs = bufImg.createGraphics(); gs.setBackground(Color.WHITE); gs.clearRect(0, 0, 140, 140); // 设定图像颜色> BLACK gs.setColor(Color.BLACK); // 设置偏移量 不设置可能导致解析出错 int pixoff = 2; // 输出内容> 二维码 if (contentBytes.length > 0 && contentBytes.length < 120) { boolean[][] codeOut = qrcodeHandler.calQrcode(contentBytes); for (int i = 0; i < codeOut.length; i++) { for (int j = 0; j < codeOut.length; j++) { if (codeOut[j][i]) { gs.fillRect(j * 3 + pixoff, i * 3 + pixoff, 3, 3); } } } } else { System.err.println("QRCode content bytes length = " + contentBytes.length + " not in [ 0,120 ]. "); } gs.dispose(); bufImg.flush(); File imgFile = new File(imgPath); // 生成二维码QRCode图片 ImageIO.write(bufImg, "png", imgFile); } catch (Exception e) { e.printStackTrace(); } } /** * @param args the command line arguments */ public static void main(String[] args) { String imgPath = "D:/test/twocode/Michael_QRCode.png"; String content = "Hello 大大、小小,welcome to QRCode!" + "\nMyblog [ http://sjsky.iteye.com ]" + "\nEMail [ sjsky007@gmail.com ]" + "\nTwitter [ @suncto ]"; QRCodeEncoderHandler handler = new QRCodeEncoderHandler(); handler.encoderQRCode(content, imgPath); System.out.println("encoder QRcode success"); } }
At this time, you can use the QR code scanning software of your mobile phone (I use: android snapshot QR code) to test it. The screenshot of successful recognition is as follows:
Friends who like it can download it and give it a try, and make some business cards or things you like. Of course, Java can also decode QR code images. For details, see the content about decoding below. 【2】. Decoding: Java code QRCodeDecoderHandler.javapackage michael.qrcode; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; import jp.sourceforge.qrcode.QRCodeDecoder; import jp.sourceforge.qrcode.data.QRCodeImage; import jp.sourceforge.qrcode.exception.DecodingFailedException; /** * @blog http://sjsky.iteye.com * @author Michael */ public class QRCodeDecoderHandler { /** * 解码二维码 * @param imgPath * @return String */ public String decoderQRCode(String imgPath) { // QRCode 二维码图片的文件 File imageFile = new File(imgPath); BufferedImage bufImg = null; String decodedData = null; try { bufImg = ImageIO.read(imageFile); QRCodeDecoder decoder = new QRCodeDecoder(); decodedData = new String(decoder.decode(new J2SEImage(bufImg))); // try { // System.out.println(new String(decodedData.getBytes("gb2312"), // "gb2312")); // } catch (Exception e) { // // TODO: handle exception // } } catch (IOException e) { System.out.println("Error: " + e.getMessage()); e.printStackTrace(); } catch (DecodingFailedException dfe) { System.out.println("Error: " + dfe.getMessage()); dfe.printStackTrace(); } return decodedData; } /** * @param args the command line arguments */ public static void main(String[] args) { QRCodeDecoderHandler handler = new QRCodeDecoderHandler(); String imgPath = "d:/test/twocode/Michael_QRCode.png"; String decoderContent = handler.decoderQRCode(imgPath); System.out.println("解析结果如下:"); System.out.println(decoderContent); System.out.println("========decoder success!!!"); } class J2SEImage implements QRCodeImage { BufferedImage bufImg; public J2SEImage(BufferedImage bufImg) { this.bufImg = bufImg; } public int getWidth() { return bufImg.getWidth(); } public int getHeight() { return bufImg.getHeight(); } public int getPixel(int x, int y) { return bufImg.getRGB(x, y); } } }