一、简单二维码生成

1.1、依赖

<!--二维码工具-->
<dependency><groupId>com.google.zxing</groupId><artifactId>core</artifactId><version>3.4.1</version>
</dependency>

1.2、二维码生成工具

QRCodeUtil

package com.example.demo.utlis;import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Hashtable;
import java.util.Map;public class QRCodeUtil {private static Log log = LogFactory.getLog(QRCodeUtil.class);private static final int BLACK = 0xFF000000;private static final int WHITE = 0xFFFFFFFF;private 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; y++) {image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);}}return image;}private static void writeToFile(BitMatrix matrix, String format, File file) throws IOException {BufferedImage image = toBufferedImage(matrix);if (!ImageIO.write(image, format, file)) {throw new IOException("Could not write an image of format " + format + " to " + file);}}/** 将内容contents生成长宽均为width的图片，图片路径由imgPath指定*/public static File getQRCodeImge(String contents, int width, String imgPath) {return getQRCodeImge(contents, width, width, imgPath);}/** 将内容contents生成长为width，宽为width的图片，图片路径由imgPath指定*/public static File getQRCodeImge(String contents, int width, int height, String imgPath) {try {Map<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);hints.put(EncodeHintType.CHARACTER_SET, "UTF8");BitMatrix bitMatrix = new MultiFormatWriter().encode(contents, BarcodeFormat.QR_CODE, width, height, hints);File imageFile = new File(imgPath);writeToFile(bitMatrix, "png", imageFile);return imageFile;} catch (Exception e) {log.error("create QR code error!", e);return null;}}
}

1.3、测试

@Test
void code() {// 需要修改为运行机器上的路径，就是本地路径String path = "E:\\java";String qrPath = String.format(path + "\\qr-%s.png", "111111111111111");String qrFileName = String.format("qr-%s.png", "111111111111111");QRCodeUtil.getQRCodeImge("https://blog.csdn.net/qq_45660133", 256, qrPath);File targetFile = new File(path, qrFileName);
}

二、生成二维码带logo

2.1、依赖

<!--二维码工具-->
<dependency><groupId>com.google.zxing</groupId><artifactId>core</artifactId><version>3.4.1</version>
</dependency>
<dependency><groupId>com.google.zxing</groupId><artifactId>javase</artifactId><version>3.3.3</version>
</dependency>

2.2、Test测试类

public class Test{public static void main(String[] args) {try {QREncode();QRReader(new File("D:\\zxing1.gif"));} catch (WriterException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} catch (NotFoundException e) {e.printStackTrace();}}/*** 生成二维码*/public static void QREncode() throws WriterException, IOException {String content = "个人博客：https://blog.csdn.net/qq_45660133";//二维码内容int width = 200; // 图像宽度int height = 200; // 图像高度String format = "gif";// 图像类型Map<EncodeHintType, Object> hints = new HashMap<>();//内容编码格式hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");// 指定纠错等级hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);//设置二维码边的空度，非负数hints.put(EncodeHintType.MARGIN, 1);BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints);MatrixToImageWriter.writeToPath(bitMatrix, format, new File("D:\\zxing.gif").toPath());// 输出原图片MatrixToImageConfig matrixToImageConfig = new MatrixToImageConfig(0xFF000001, 0xFFFFFFFF);/*问题：生成二维码正常,生成带logo的二维码logo变成黑白原因：MatrixToImageConfig默认黑白，需要设置BLACK、WHITE解决：https://ququjioulai.iteye.com/blog/2254382*/BufferedImage bufferedImage = LogoMatrix(MatrixToImageWriter.toBufferedImage(bitMatrix,matrixToImageConfig), new File("D:\\logo.png"));
//        BufferedImage bufferedImage = LogoMatrix(toBufferedImage(bitMatrix), new File("D:\\logo.png"));ImageIO.write(bufferedImage, "gif", new File("D:\\zxing1.gif"));//输出带logo图片System.out.println("输出成功.");}/*** 识别二维码*/public static void QRReader(File file) throws IOException, NotFoundException {MultiFormatReader formatReader = new MultiFormatReader();//读取指定的二维码文件BufferedImage bufferedImage =ImageIO.read(file);BinaryBitmap binaryBitmap= new BinaryBitmap(new HybridBinarizer(new BufferedImageLuminanceSource(bufferedImage)));//定义二维码参数Map  hints= new HashMap<>();hints.put(EncodeHintType.CHARACTER_SET, "utf-8");com.google.zxing.Result result = formatReader.decode(binaryBitmap, hints);//输出相关的二维码信息System.out.println("解析结果："+result.toString());System.out.println("二维码格式类型："+result.getBarcodeFormat());System.out.println("二维码文本内容："+result.getText());bufferedImage.flush();}/*** 二维码添加logo* @param matrixImage 源二维码图片* @param logoFile logo图片* @return 返回带有logo的二维码图片*/public static BufferedImage LogoMatrix(BufferedImage matrixImage, File logoFile) throws IOException{/*** 读取二维码图片，并构建绘图对象*/Graphics2D g2 = matrixImage.createGraphics();int matrixWidth = matrixImage.getWidth();int matrixHeigh = matrixImage.getHeight();/*** 读取Logo图片*/BufferedImage logo = ImageIO.read(logoFile);//开始绘制图片g2.drawImage(logo,matrixWidth/5*2,matrixHeigh/5*2, matrixWidth/5, matrixHeigh/5, null);//绘制BasicStroke stroke = new BasicStroke(5,BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND);g2.setStroke(stroke);// 设置笔画对象//指定弧度的圆角矩形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);// 绘制圆弧矩形//设置logo 有一道灰色边框BasicStroke stroke2 = new BasicStroke(1,BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND);g2.setStroke(stroke2);// 设置笔画对象RoundRectangle2D.Float round2 = new RoundRectangle2D.Float(matrixWidth/5*2+2, matrixHeigh/5*2+2, matrixWidth/5-4, matrixHeigh/5-4,20,20);g2.setColor(new Color(128,128,128));g2.draw(round2);// 绘制圆弧矩形g2.dispose();matrixImage.flush() ;return matrixImage ;}
}

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SpringBoot利用ZXing工具来生成二维码（简单）

一、简单二维码生成

1.1、依赖

1.2、二维码生成工具

1.3、测试

二、生成二维码带logo

2.1、依赖

2.2、Test测试类

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