基于Java实现二维码的生成和解析
目录
- 导入相关jar包
- 二维码工具类编
- 创建二维码图片
- 二维码设置logo
- 将文明说明增加到二维码上
- 解析二维码
- main方法测试类
最近因个人需求需要对根据内容生成二维码和进行解析!记录一下!二维码其实就是一种编码技术,只是这种编码技术是用在图片上了,将给定的一些文字,数字转换为一张经过特定编码的图片。这里利用的是 google 公司的 zxing使用方便,可以操作条形码或者二维码等
导入相关jar包
<!-- 二维码 --> <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>3.3.3</version> </dependency>
二维码工具类编
创建二维码图片
public static BufferedImage createImage(String charSet, String content, int qrWidth, int qrHeight) { Hashtable hints = new Hashtable(); hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); hints.put(EncodeHintType.CHARACTER_SET, charSet); hints.put(EncodeHintType.MARGIN, 1); BitMatrix bitMatrix = null; try { bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, qrWidth, qrHeight, // 修改二维码底部高度 hints); } catch (WriterException e) { e.printStackTrace(); } 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); } } return image; }
二维码设置logo
public static void insertLogoImage(BufferedImage source, Image logo, int logoWidth, int logoHeight) { Graphics2D graph = source.createGraphics(); int qrWidth = source.getWidth(); int qrHeight = source.getHeight(); int x = (qrWidth - logoWidth) / 2; int y = (qrHeight - logoHeight) / 2; graph.drawImage(logo, x, y, logoWidth, logoHeight, null); Shape shape = new RoundRectangle2D.Float(x, y, logoWidth, logoHeight, 6, 6); graph.setStroke(new BasicStroke(3f)); graph.draw(shape); graph.dispose(); }
将文明说明增加到二维码上
public static BufferedImage textToImage(String str, int width, int height, int fontSize) { BufferedImage textImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g2 = (Graphics2D) textImage.getGraphics(); //开启文字抗锯齿 g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON); g2.setBackground(Color.WHITE); g2.clearRect(0, 0, width, height); g2.setPaint(Color.BLACK); FontRenderContext context = g2.getFontRenderContext(); Font font = new Font("微软雅黑", Font.PLAIN, fontSize); g2.setFont(font); LineMetrics lineMetrics = font.getLineMetrics(str, context); FontMetrics fontMetrics = FontDesignMetrics.getMetrics(font); float offset = (width - fontMetrics.stringWidth(str)) / 2; float y = (height + lineMetrics.getAscent() - lineMetrics.getDescent() - lineMetrics.getLeading()) / 2; g2.drawString(str, (int) offset, (int) y); return textImage; }
解析二维码
/* * 解析二维码 */ public static String decode(File file, DecodeHintType cherSet) 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, cherSet); hints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE); hints.put(DecodeHintType.PURE_BARCODE, Boolean.TRUE); result = new MultiFormatReader().decode(bitmap, hints); String resultStr = result.getText(); return resultStr; }
main方法测试类
public static void main(String[] args) { String content="用户摄影作品版权信息"; BufferedImage image = QRCodeUtil.createImage( "utf-8", content, 400, 400 ); QRCodeUtil.addUpFont( image,"用户摄影作品版权信息" ); String formatName="png"; String imagePath="D:\temp\java二维码.png"; File file=new File(imagePath); try { ImageIO.write(image, formatName, file); } catch (IOException e) { e.printStackTrace(); } String decode = null; try { decode = QRCodeUtil.decode(file, DecodeHintType.CHARACTER_SET); } catch (Exception e) { e.printStackTrace(); } System.out.println(decode); System.out.println("执行完成"); }
这样就实现了 !二维码里面的内容根据实际数据来就行!用手机扫描后查看。
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