SpringBoot生成二维码

导入依赖

 
 
     com.google.zxing
     javase
     3.3.0
 

工具类

 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.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.util.Hashtable;
 ​
 
 public class QrCodeUtils {
     private static final String CHARSET = "utf-8";
     public static final String FORMAT = "JPG";
     // 二维码尺寸
     private static final int QRCODE_SIZE = 300;
     // LOGO宽度
     private static final int LOGO_WIDTH = 60;
     // LOGO高度
     private static final int LOGO_HEIGHT = 60;
 ​
     
     public static BufferedImage createImage(String content, String logoPath, 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, 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, needCompress);
         return image;
     }
 ​
     
     private static void insertImage(BufferedImage source, String logoPath,
                                     boolean needCompress) throws Exception {
         File file = new File(logoPath);
         if (!file.exists()) {
             System.err.println(""+logoPath+"   该文件不存在！");
             return;
         }
         Image src = ImageIO.read(new File(logoPath));
         int width = src.getWidth(null);
         int height = src.getHeight(null);
         if (needCompress) { // 压缩LOGO
             if (width > LOGO_WIDTH) {
                 width = LOGO_WIDTH;
             }
             if (height > LOGO_HEIGHT) {
                 height = LOGO_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();
     }
 ​
     
     public static void encode(String content, String imgPath, String destPath, boolean needCompress) throws Exception {
         BufferedImage image = QrCodeUtils.createImage(content, imgPath, needCompress);
         mkdirs(destPath);
         // String file = new Random().nextInt(99999999)+".jpg";
         // ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));
         ImageIO.write(image, FORMAT, new File(destPath));
     }
 ​
     
     public static BufferedImage encode(String content, String imgPath, boolean needCompress) throws Exception {
         BufferedImage image = QrCodeUtils.createImage(content, imgPath, needCompress);
         return image;
     }
 ​
     public static void mkdirs(String destPath) {
         File file = new File(destPath);
         // 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
         if (!file.exists() && !file.isDirectory()) {
             file.mkdirs();
         }
     }
 ​
     
     public static void encode(String content, String logoPath, OutputStream output, boolean needCompress)
             throws Exception {
         BufferedImage image = QrCodeUtils.createImage(content, logoPath, needCompress);
         ImageIO.write(image, FORMAT, output);
     }
 ​
     
     public static InputStream getResourceAsStream(String logoPath) {
         return QrCodeUtils.class.getResourceAsStream(logoPath);
     }
 ​
     
     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 hints = new Hashtable();
         hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
         result = new MultiFormatReader().decode(bitmap, hints);
         String resultStr = result.getText();
         return resultStr;
     }
 ​
     
     public static String decode(String path) throws Exception {
         return QrCodeUtils.decode(new File(path));
     }
 }

controller

 @GetMapping("/CodeTest")
 @ApiOperation(value = "获取二维码")
 public void qrCodeTest(HttpServletResponse response) throws Exception {
     // 这个是二维码里面的内容，如果是网址则会跳转到网址界面
     String text = "https://blog.csdn.net/m0_56750901";
     String logoPath = "D:\qrCode\logo.jpg";
     //String destPath = "D:\qrCode\csdn.jpg";
     QrCodeUtils.encode(text,logoPath,response.getOutputStream(),true);
 }