通过java生成读取二维码详解

public class QRcodeTest {public static void main(String[] args) throws Exception{Qrcode qrcode = new Qrcode();qrcode.setQrcodeErrorCorrect('M');//纠错等级（分为L、M、H三个等级）qrcode.setQrcodeEncodeMode('B');//N代表数字，A代表a-Z，B代表其它字符qrcode.setQrcodeVersion(10);//版本//生成二维码中要存储的信息String qrData ="http://www.baidu.com";//设置一下二维码的像素int width = 67+12*(10-1);int height = 67+12*(10-1);BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);//绘图Graphics2D gs = bufferedImage.createGraphics();gs.setBackground(Color.WHITE);gs.setColor(Color.BLACK);gs.clearRect(0, 0, width, height);//清除下画板内容//设置下偏移量,如果不加偏移量，有时会导致出错。int pixoff = 2;byte[] d = qrData.getBytes("gb2312");if(d.length > 0 && d.length <120){boolean[][] s = qrcode.calQrcode(d);for(int i=0;i<s.length;i++){for(int j=0;j<s.length;j++){if(s[j][i]){gs.fillRect(j*3+pixoff, i*3+pixoff, 3, 3);}}}}gs.dispose();bufferedImage.flush();//设置要存储的目录（这里存储在本地）ImageIO.write(bufferedImage, "png", new File("E:/code/qrcodebd.png"));}}

public class MyQrCodeImage implements QRCodeImage {BufferedImage bufferedImage;public MyQrCodeImage(BufferedImage bufferedImage) {this.bufferedImage = bufferedImage;}public int getHeight() {return bufferedImage.getHeight();}public int getPixel(int arg0, int arg1) {return bufferedImage.getRGB(arg0, arg1);}public int getWidth() {return bufferedImage.getWidth();}}

public class ReadQrCode {public static void main(String[] args) throws IOException {File file = new File("E:/code/qrcodebd.png");BufferedImage bufferedImage = ImageIO.read(file);Qrcode qrcode = new Qrcode();QRCodeDecoder codeDecoder = new QRCodeDecoder();String result = new String(codeDecoder.decode(new MyQrCodeImage(bufferedImage)),"gb2312");System.out.println(result);}}