Java实现二维码的生成和解析

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");}