通过 zxing 生成二维码
二维码现在随处可见，在日常的开发中，也会经常涉及到二维码的生成，特别是开发一些活动或者推广方面的功能时，二维码甚至成为必备功能点。本文介绍通过 google 的 zxing 包生成带 logo 的二维码的过程，供大家参考。
ZXing的github地址：https://github.com/zxing/zxing
一、引入zxing所需依赖
<dependency> <groupId>com.google.zxing</groupId> <artifactId>core</artifactId> <version>3.3.0</version> </dependency> <dependency> <groupId>com.google.zxing</groupId> <artifactId>javase</artifactId> <version>3.3.0</version> </dependency>
二、二维码工具类实现
package com.psk.hms.base.util; 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 javax.imageio.ImageIO; import java.awt.*; import java.awt.geom.RoundRectangle2D; import java.awt.image.BufferedImage; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.util.Hashtable; /** * 二维码生成及读取工具类 * * @author chenj. * @version 1.0 * @since 2019/3/14 18:46 */ public class QRCodeUtil { private static final String CHARSET = "UTF-8"; private static final String FORMAT_NAME = "JPG"; // 二维码尺寸 private static final int QRCODE_SIZE = 200; // LOGO宽度 private static final int WIDTH = 60; // LOGO高度 private static final int HEIGHT = 60; /** * 创建二维码图片 * * @param content 二维码内容 * @param logoImgPath Logo * @param needCompress 是否压缩Logo * @return 返回二维码图片 * @throws WriterException * @throws IOException BufferedImage */ private static BufferedImage createImage(String content, String logoImgPath, boolean needCompress) throws WriterException, IOException { Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>(); 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 (logoImgPath == null || "".equals(logoImgPath)) { return image; } // 插入图片 QRCodeUtil.insertImage(image, logoImgPath, needCompress); return image; } /** * 添加Logo * * @param source 二维码图片 * @param logoImgPath Logo * @param needCompress 是否压缩Logo * @throws IOException void */ private static void insertImage(BufferedImage source, String logoImgPath, boolean needCompress) throws IOException { File file = new File(logoImgPath); if (!file.exists()) { return; } Image src = ImageIO.read(new File(logoImgPath)); int width = src.getWidth(null); int height = src.getHeight(null); if (needCompress) { // 压缩LOGO 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(); g.drawImage(image, 0, 0, null); // 绘制缩小后的图 g.dispose(); src = image; } // 插入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(); } /** * 生成带Logo的二维码 * * @param content 二维码内容 * @param logoImgPath Logo * @param destPath 二维码输出路径 * @param needCompress 是否压缩Logo * @throws Exception void */ public static void encode(String content, String logoImgPath, String destPath, boolean needCompress) throws Exception { BufferedImage image = QRCodeUtil.createImage(content, logoImgPath, needCompress); mkdirs(destPath); ImageIO.write(image, FORMAT_NAME, new File(destPath)); } /** * 生成不带Logo的二维码 * * @param content 二维码内容 * @param destPath 二维码输出路径 */ public static void encode(String content, String destPath) throws Exception { QRCodeUtil.encode(content, null, destPath, false); } /** * 生成带Logo的二维码，并输出到指定的输出流 * * @param content 二维码内容 * @param logoImgPath Logo * @param output 输出流 * @param needCompress 是否压缩Logo */ public static void encode(String content, String logoImgPath, OutputStream output, boolean needCompress) throws Exception { BufferedImage image = QRCodeUtil.createImage(content, logoImgPath, needCompress); ImageIO.write(image, FORMAT_NAME, output); } /** * 生成不带Logo的二维码，并输出到指定的输出流 * * @param content 二维码内容 * @param output 输出流 * @throws Exception void */ public static void encode(String content, OutputStream output) throws Exception { QRCodeUtil.encode(content, null, output, false); } /** * 二维码解析 * * @param file 二维码 * @return 返回解析得到的二维码内容 * @throws Exception String */ public static String decode(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<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>(); hints.put(DecodeHintType.CHARACTER_SET, CHARSET); result = new MultiFormatReader().decode(bitmap, hints); String resultStr = result.getText(); return resultStr; } /** * 二维码解析 * * @param path 二维码存储位置 * @return 返回解析得到的二维码内容 * @throws Exception String */ public static String decode(String path) throws Exception { return QRCodeUtil.decode(new File(path)); } /** * 判断路径是否存在，如果不存在则创建 * * @param dir 目录 */ public static void mkdirs(String dir) { if (dir != null && !"".equals(dir)) { File file = new File(dir); if (!file.isDirectory()) { file.mkdirs(); } } } }
三、测试
1、生成不带Logo的二维码
public static void main(String[] args) throws Exception { String dir = "d:/qrcode.jpg"; String content = "https://www.cnblogs.com/jimc"; File file = new File(dir); QRCodeUtil.encode(content, new FileOutputStream(file)); System.out.println(QRCodeUtil.decode(file)); }
生成效果：
2、生成带Logo的二维码
public static void main(String[] args) throws Exception { String dir = "d:/qrcode.jpg"; String content = "https://www.cnblogs.com/jimc/"; String logoImgPath = "d:/logo.png"; File file = new File(dir); QRCodeUtil.encode(content, logoImgPath, new FileOutputStream(file), true); System.out.println(QRCodeUtil.decode(file)); }
生成效果：
