最简单实用的java生成二维码工具类

﹏ヽ暗。殇╰゛Y 2022-05-09 13:52 193阅读 0赞

import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.IOException;
    import java.io.OutputStream;
    import java.util.Map;
    
    import javax.imageio.ImageIO;
    
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    import com.google.common.collect.Maps;
    import com.google.zxing.BarcodeFormat;
    import com.google.zxing.EncodeHintType;
    import com.google.zxing.MultiFormatWriter;
    import com.google.zxing.WriterException;
    import com.google.zxing.common.BitMatrix;
    
    /**
     * ClassName: QRCodeUtils
     * Function: <p> QRcode utils  </p>
     * date: 2018/1/13 13:21
     *
     * @author wangdongdong
     * @version 1.0.0
     * @since JDK 1.8
     */
    public class QRCodeUtils {
    
        private static Logger logger = LoggerFactory.getLogger(QRCodeUtils.class);
    
        public static void generate(String content, String pathname) {
    
            try {
                MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
    
                Map hints = Maps.newHashMap();
    
                hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
    
                BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, 400, 400, hints);
    
                MatrixToImageWriter.writeToFile(bitMatrix, "jpg", new File(pathname));
            } catch (Exception e) {
                logger.error("二维码生成出错", e.getMessage());
            }
        }
    
        public static void generate(String content, OutputStream stream) {
    
            try {
                MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
    
                Map hints = Maps.newHashMap();
    
                hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
    
                BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, 400, 400, hints);
    
                MatrixToImageWriter.writeToStream(bitMatrix, "jpg", stream);
            } catch (Exception e) {
                logger.error("二维码生成出错", e.getMessage());
            }
        }
    }
    
    class MatrixToImageWriter {
    
        private static final int BLACK = 0xFF000000;
        private static final int WHITE = 0xFFFFFFFF;
    
        private MatrixToImageWriter() {
        }
    
    
        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;
        }
    
    
        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);
            }
        }
    
    
        public static void writeToStream(BitMatrix matrix, String format, OutputStream stream)
                throws IOException {
            BufferedImage image = toBufferedImage(matrix);
            if (!ImageIO.write(image, format, stream)) {
                throw new IOException("Could not write an image of format " + format);
            }
        }
    }

此处是生成二维码的工具类，直接带上参数调generate()即可，

相信大家都能看懂，如果有问题请留言或私信。