- 引入zxing依赖:
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
</dependency>
- 二维码生成工具类
public class QRCodeUtil {
private QRCodeUtil(){}
private static final String UNICODE = "utf-8";
private static final String FORMAT = "JPG";
private static final int QRCODE_WIDTH = 300;
private static final int QRCODE_HEIGHT = 300;
private static final int LOGO_WIDTH = 100;
private static final int LOGO_HEIGHT = 100;
private static BufferedImage createImage(String content, String logoPath, boolean needCompress) throws IOException, WriterException {
HashMap<EncodeHintType, Object> hints = new HashMap<>(8);
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
hints.put(EncodeHintType.CHARACTER_SET, UNICODE);
hints.put(EncodeHintType.MARGIN, 1);
BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_WIDTH, QRCODE_HEIGHT,
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;
}
QRCodeUtil.insertImage(image, logoPath, needCompress);
return image;
}
private static void insertImage(BufferedImage source, String logoPath, boolean needCompress) throws IOException {
File file = new File(logoPath);
if (!file.exists()) {
throw new IOException("logo file not found.");
}
Image src = ImageIO.read(new File(logoPath));
int width = src.getWidth(null);
int height = src.getHeight(null);
if (needCompress) {
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);
g.dispose();
src = image;
}
Graphics2D graph = source.createGraphics();
int x = (QRCODE_WIDTH - width) / 2;
int y = (QRCODE_HEIGHT - 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 String encode(String content, String logoPath, String destPath, String fileName, boolean needCompress) throws IOException, WriterException {
BufferedImage image = QRCodeUtil.createImage(content, logoPath, needCompress);
mkdirs(destPath);
fileName = fileName.substring(0, fileName.indexOf('.') != -1 ? fileName.indexOf('.'):fileName.length())
+ "." + FORMAT.toLowerCase();
ImageIO.write(image, FORMAT, new File(destPath + fileName));
return fileName;
}
public static void mkdirs(String destPath) throws IOException {
File file = new File(destPath);
if (!file.exists() && !file.isDirectory()) {
boolean isOK = file.mkdirs();
if (!isOK){
throw new IOException("生成二维码暂存文件夹失败");
}
}
}
public static String decode(String path) throws IOException, NotFoundException {
File file = new File(path);
BufferedImage image = ImageIO.read(file);
if (image == null) {
return null;
}
BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
Result result;
HashMap<DecodeHintType, Object> hints = new HashMap<>(8);
hints.put(DecodeHintType.CHARACTER_SET, UNICODE);
result = new MultiFormatReader().decode(bitmap, hints);
return result.getText();
}
}