Java uses zpxing. jar to generate a QR code with a url

Step 1 download the zpxing. jar package and load it in (there are many similar jar packages on the Internet. Here we use the jar provided by Google)

QR code tool:

Package com. zpxing. controller; import java. awt. basicStroke; import java. awt. graphics; import java. awt. graphics2D; import java. awt. image; import java. awt. shape; import java. awt. geom. roundRectangle2D; import java. awt. image. bufferedImage; import java. io. file; import java. io. outputStream; import java. util. hashtable; import java. util. random; import javax. imageio. imageIO; import com. google. zxing. barcodeFormat; import com. google. zxing. binaryBitmap; import com. google. zxing. decodeHintType; import com. google. zxing. encodeHintType; import com. google. zxing. multiFormatReader; import com. google. zxing. multiFormatWriter; import com. google. zxing. result; import com. google. zxing. common. bitMatrix; import com. google. zxing. common. hybridBinarizer; import com. google. zxing. qrcode. decoder. errorCorrectionLevel;/*** QR code tool class **/public class QRCodeUtil {private static final String CHARSET = "UTF-8"; private static final String FORMAT_NAME = "JPG "; // QR code size private static final int QRCODE_SIZE = 300; // logo width private static final int WIDTH = 60; // logo height private static final int HEIGHT = 60; private static BufferedImage createImage (String content, String imgPath, boolean needCompress) throws Exception {Hashtable
 
  
Hints = new Hashtable
  
   
(); Hints. put (EncodeHintType. ERROR_CORRECTION, ErrorCorrectionLevel. h); hints. put (EncodeHintType. CHARACTER_SET, CHARSET); hints. put (EncodeHintType. MARGIN, 1); BitMatrix bitMatrix = new MultiFormatWriter (). encode (content, BarcodeFormat. QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints); int width = bitMatrix. getWidth (); int height = bitMatrix. getHeight (); BufferedImage image = new BufferedImage (width, height, Buffere DImage. TYPE_INT_RGB); for (int x = 0; x <width; x ++) {for (int y = 0; y 
    
Hints = new Hashtable
    
     
(); Hints. put (DecodeHintType. CHARACTER_SET, CHARSET); result = new MultiFormatReader (). decode (bitmap, hints); String resultStr = result. getText (); return resultStr;}/*** resolve the QR code ** @ param path * QR code image address * @ return * @ throws Exception */public static String decode (String path) throws Exception {return QRCodeUtil. decode (new File (path);} public static void main (String [] args) throws Exception {String text = "http://www.thinkphp.cn/extend/295.html"; QRCodeUtil. encode (text, "C:/Users/Public/Pictures/Sample Pictures/images.jpg", "C:/Users/Public/Pictures/Sample Pictures/", true );}}
    
   
  
 

2. BufferedImageLuminanceSource class:

package com.zpxing.controller;import java.awt.Graphics2D;import java.awt.geom.AffineTransform;import java.awt.image.BufferedImage;import com.google.zxing.LuminanceSource;public class BufferedImageLuminanceSource extends LuminanceSource {private final BufferedImage image;private final int left;private final int top;public BufferedImageLuminanceSource(BufferedImage image) {this(image, 0, 0, image.getWidth(), image.getHeight());}public BufferedImageLuminanceSource(BufferedImage image, int left,int top, int width, int height) {super(width, height);int sourceWidth = image.getWidth();int sourceHeight = image.getHeight();if (left + width > sourceWidth || top + height > sourceHeight) {throw new IllegalArgumentException("Crop rectangle does not fit within image data.");}for (int y = top; y < top + height; y++) {for (int x = left; x < left + width; x++) {if ((image.getRGB(x, y) & 0xFF000000) == 0) {image.setRGB(x, y, 0xFFFFFFFF); // = white}}}this.image = new BufferedImage(sourceWidth, sourceHeight,BufferedImage.TYPE_BYTE_GRAY);this.image.getGraphics().drawImage(image, 0, 0, null);this.left = left;this.top = top;}public byte[] getRow(int y, byte[] row) {if (y < 0 || y >= getHeight()) {throw new IllegalArgumentException("Requested row is outside the image: " + y);}int width = getWidth();if (row == null || row.length < width) {row = new byte[width];}image.getRaster().getDataElements(left, top + y, width, 1, row);return row;}public byte[] getMatrix() {int width = getWidth();int height = getHeight();int area = width * height;byte[] matrix = new byte[area];image.getRaster().getDataElements(left, top, width, height, matrix);return matrix;}public boolean isCropSupported() {return true;}public LuminanceSource crop(int left, int top, int width, int height) {return new BufferedImageLuminanceSource(image, this.left + left,this.top + top, width, height);}public boolean isRotateSupported() {return true;}public LuminanceSource rotateCounterClockwise() {int sourceWidth = image.getWidth();int sourceHeight = image.getHeight();AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0,0.0, 0.0, sourceWidth);BufferedImage rotatedImage = new BufferedImage(sourceHeight,sourceWidth, BufferedImage.TYPE_BYTE_GRAY);Graphics2D g = rotatedImage.createGraphics();g.drawImage(image, transform, null);g.dispose();int width = getWidth();return new BufferedImageLuminanceSource(rotatedImage, top,sourceWidth - (left + width), getHeight(), width);}}

This is to set the url to jump after scanning: String text = "http://www.thinkphp.cn/extend/295.html"; readers can set themselves, can also contain parameters

The generated QR code is available and will jump