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This article introduces how to generate a QR code in Zxing and return it. The content is very detailed. Interested friends can use it for reference. I hope it will be helpful to you.

Introduction of Google Zxing jar package com.google.zxing core 3.4.0 com.google.zxing javase 3.4.0 tool class package com.sunlands.feo.school.candlestick.utils;import com.google.zxing.*;import com.google.zxing.client.j2se.BufferedImageLuminanceSource;import com.google.zxing.common.BitMatrix;import com.google.zxing.common.HybridBinarizer;import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;import org.springframework.stereotype.Component;import javax.imageio.ImageIO;import java.awt.* Import java.awt.geom.RoundRectangle2D;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.io.OutputStream;import java.util.Hashtable;/** * @ author dongxie * / @ Componentpublic class QrCodeUtils {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 / * create param content image * * @ param logoPath logo * @ param isCompress whether to compress Logo * @ return return QR code image * @ throws WriterException e * @ throws IOException BufferedImage * / public static BufferedImage createImage (String content, String logoPath, boolean isCompress) throws WriterException, IOException {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, BufferedImage.TYPE_INT_RGB); for (int x = 0; x

< width; x++) { for (int y = 0; y < height; y++) { image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF); } } if (logoPath == null || "".equals(logoPath)) { return image; } // 插入图片 QrCodeUtils.insertImage(image, logoPath, isCompress); return image; } /** * 添加Logo * * @param source 二维码图片 * @param logoPath Logo * @param isCompress 是否压缩Logo * @throws IOException void */ private static void insertImage(BufferedImage source, String logoPath, boolean isCompress) throws IOException { File file = new File(logoPath); if (!file.exists()) { return; } Image src = ImageIO.read(new File(logoPath)); int width = src.getWidth(null); int height = src.getHeight(null); // 压缩LOGO if (isCompress) { if (width >

WIDTH) {width = WIDTH;} if (height > HEIGHT) {height = HEIGHT;} Image image = src.getScaledInstance (width, height, Image.SCALE_SMOOTH); BufferedImage tag = new BufferedImage (width, height, BufferedImage.TYPE_INT_RGB); Graphics g = tag.getGraphics () / / draw g.drawImage (image, 0,0, null); g.dispose (); src = image;} / / insert LOGO Graphics2D graph = source.createGraphics (); int x = (QRCODE_SIZE-width) / 2; int y = (QRCODE_SIZE-height) / 2 Graph.drawImage (src, x, y, width, height, null); Shape shape = new RoundRectangle2D.Float (x, y, width, width, 6,6); graph.setStroke (new BasicStroke (3f)); graph.draw (shape); graph.dispose () } / * generate QR code with Logo * * @ param content QR code content * @ param logoPath Logo * @ param destPath QR code output path * @ param isCompress whether to compress Logo * @ throws Exception void * / public static void create (String content, String logoPath, String destPath, boolean isCompress) throws Exception {BufferedImage image = QrCodeUtils.createImage (content, logoPath, isCompress) Mkdirs (destPath); ImageIO.write (image, FORMAT_NAME, new File (destPath));} / * * generate QR code without Logo * * @ param content QR code content * @ param destPath QR code output path * / public static void create (String content, String destPath) throws Exception {QrCodeUtils.create (content, null, destPath, false) } / * generate a QR code with Logo and output it to the specified output stream * * @ param content QR code content * @ param logoPath Logo * @ param output output stream * @ param isCompress whether to compress Logo * / public static void create (String content, String logoPath, OutputStream output, boolean isCompress) throws Exception {BufferedImage image = QrCodeUtils.createImage (content, logoPath, isCompress) ImageIO.write (image, FORMAT_NAME, output);} / * generates a QR code without Logo and outputs it to the specified output stream * * @ param content QR code content * @ param output output stream * @ throws Exception void * / public static void create (String content, OutputStream output) throws Exception {QrCodeUtils.create (content, null, output, false) } / * QR code parsing * @ param file QR code * @ return returns the parsed QR code content * @ throws Exception String * / public static String parse (File file) throws Exception {BufferedImage image; image = ImageIO.read (file); if (image = = null) {return null } BufferedImageLuminanceSource source = new BufferedImageLuminanceSource (image); BinaryBitmap bitmap = new BinaryBitmap (new HybridBinarizer (source)); Result result; Hashtable hints = new Hashtable (); hints.put (DecodeHintType.CHARACTER_SET, CHARSET); result = new MultiFormatReader (). Decode (bitmap, hints); return result.getText () } / * QR code parsing * @ param path QR code storage location * @ return returns the parsed QR code content * @ throws Exception String * / public static String parse (String path) throws Exception {return QrCodeUtils.parse (new File (path)) } / * determine whether the path exists. If it does not exist, create a * * @ param dir directory * / public static void mkdirs (String dir) {if (dir! = null & &! ".equals (dir)) {File file = new File (dir); if (! file.isDirectory ()) {file.mkdirs () } use package com.jiafly.blueberry.controller;import com.jiafly.blueberry.common.utils.QrCodeUtils;import org.apache.tomcat.util.http.fileupload.IOUtils;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.RestController;import javax.imageio.ImageIO;import javax.imageio.stream.ImageOutputStream;import javax.servlet.http.HttpServletResponse Import java.awt.image.BufferedImage;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.InputStream;import java.io.OutputStream;/** * author dongxie * / @ RestController@RequestMapping (path = "/ qrcode") public class QrCodeController {@ GetMapping (path = "/ create") public void image (HttpServletResponse response, @ RequestParam ("content") String content) {try {BufferedImage bufferedImage = QrCodeUtils.createImage (content, null, false) ResponseImage (response, bufferedImage);} catch (Exception e) {/ / exceptions are handled by themselves. Applications should not print stack logs directly, which is difficult to locate e.printStackTrace (). }} / * settings can be accessed directly through postman or browser * * @ param response response * @ param bufferedImage bufferedImage * @ throws Exception e * / public void responseImage (HttpServletResponse response, BufferedImage bufferedImage) throws Exception {ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream (); ImageOutputStream imageOutput = ImageIO.createImageOutputStream (byteArrayOutputStream); ImageIO.write (bufferedImage, "jpeg", imageOutput) InputStream inputStream = new ByteArrayInputStream (byteArrayOutputStream.toByteArray ()); OutputStream outputStream = response.getOutputStream (); response.setContentType ("image/jpeg"); response.setCharacterEncoding ("UTF-8"); IOUtils.copy (inputStream, outputStream); outputStream.flush () }} about how to generate a QR code in Zxing and return it, I hope the above content can be of some help to you and learn more knowledge. 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