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This article mainly introduces how java generates the QR code and adds logo to the QR code. The article is very detailed and has a certain reference value. Interested friends must read it!

Java generates a QR code, as shown below:

Package com.bus.wx.action.code;import java.awt.BasicStroke;import java.awt.Color;import java.awt.Graphics2D;import java.awt.RenderingHints;import java.awt.geom.RoundRectangle2D;import java.awt.image.BufferedImage;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.File;import java.io.IOException;import java.io.InputStream;import java.util.HashMap;import java.util.Hashtable;import java.util.Map;import javax.imageio.ImageIO;import javax.servlet.ServletOutputStream Import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;import com.bus.plugin.wx.action.WxAction;import com.bus.wx.util.Limits;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.QRCodeWriter;import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;import com.lys.sys.log.Log / * barcode, QR code * @ author hwj * * / @ Scope (value= "prototype") @ Controller ("Bar_Qr_Code_Action") @ RequestMapping (value= "plug/wx/wwz/ {bcflag} / barqrcode") public class Bar_Qr_Code_Action extends WxAction {private static final int LogoPart = 4; private static final int BLACK = 0xFF000000ramp / the color used to set the pattern private static final int WHITE = 0xFFFFFFFF; / / for the background color String format = "png" Public static BufferedImage toBufferedImage (BitMatrix matrix) {int width = matrix.getWidth (); int height = matrix.getHeight (); BufferedImage image = new BufferedImage (width, height, BufferedImage.TYPE_INT_RGB); for (int x = 0; x < width; x +) {for (int y = 0; y < height; yearly +) {image.setRGB (x, y, (matrix.get (x, y)? BLACK: WHITE); / / image.setRGB (x, y, (matrix.get (x, y)? Color.YELLOW.getRGB (): Color.CYAN.getRGB ());}} return image;} public BufferedImage LogoMatrix (BufferedImage matrixImage) throws IOException {/ * read the QR code picture and build the drawing object * / Graphics2D G2 = matrixImage.createGraphics (); int matrixWidth = matrixImage.getWidth (); int matrixHeigh = matrixImage.getHeight () / * read Logo image * / String path=request.getSession () .getServletContext () .getRealPath ("/ images/logo/dzjkklog.png"); BufferedImage logo = ImageIO.read (new File (path)); / / start drawing g2.drawImage (logo,matrixWidth/5*2,matrixHeigh/5*2, matrixWidth/5, matrixHeigh/5, null) / / draw BasicStroke stroke = new BasicStroke; g2.setStroke (stroke); / / set stroke object / / rounded rectangle with specified radians RoundRectangle2D.Float round = new RoundRectangle2D.Float (matrixWidth/5*2, matrixHeigh/5*2, matrixWidth/5, matrixHeigh/5,20,20); g2.setColor (Color.white); g2.draw (round) / / draw a circular rectangle / / set logo to have a gray border BasicStroke stroke2 = new BasicStroke (1Magnetics BasicStroke.JOINGROUND); g2.setStroke (stroke2); / / set stroke object RoundRectangle2D.Float round2 = new RoundRectangle2D.Float (matrixWidth/5*2+2, matrixHeigh/5*2+2, matrixWidth/5-4, matrixHeigh/5-4 20); g2.setColor (new Color (128128128)); g2.draw (round2) / / draw arc rectangle g2.dispose (); matrixImage.flush (); return matrixImage;} / * * generate QR code: transfer the generated QR code directly to the foreground page * @ param bcflag * / @ RequestMapping (value= "createQrCodes", method = RequestMethod.GET) public void createQrCodes (@ PathVariable String bcflag,String dastid) {String url= "scan the content of the QR code" If {int width=430; int height=430; stream=response.getOutputStream (); QRCodeWriter writer=new QRCodeWriter (); Hashtable hints = new Hashtable (); hints.put (EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); hints.put (EncodeHintType.CHARACTER_SET, "utf-8"); hints.put (EncodeHintType.MARGIN, 1) / / sets the emptiness of the edge of the QR code, non-negative BitMatrix bitMatrix = new MultiFormatWriter (). Encode (url,// content to be encoded BarcodeFormat.QR_CODE, width, / / the width of the bar code height, / / the height of the bar code hints); / / BitMatrix m=writer.encode (url, BarcodeFormat.QR_CODE, height,width); BufferedImage image = toBufferedImage (bitMatrix); image = LogoMatrix (image) If (! ImageIO.write (image, format, stream)) {throw new IOException ("Could not write an image of format" + format);}} catch (Exception e) {Log.in.info (e.getMessage ());} finally {if (streamlined null) {try {stream.flush (); stream.close ();} catch (IOException e) {Log.in.info (e.getMessage ()) The above is all the contents of the article "how java generates a QR code and adds logo to a QR code". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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