【記】二維碼生成及解析功能
阿新 • • 發佈：2018-12-21
前臺渲染到後臺 //生成二維碼放入資料夾裡 public void testEncode() throws FileNotFoundException, Exception { //選中的list List<String> select = getDataGridData().getSelectKeys(); for (String sel : select) { dataBean = service.find(Gudingzichan.class, sel); //建立的地址，二維碼圖片名字 String dir = ConfigApi.getFrameConfigValue("LocalPlace")+"/"+dataBean.getAssetno()+".jpg"; //二維碼內容（提供詳情頁地址） String content ="xzbg/gudingzichan/gudingzichandetail?guid="+sel; //二維碼的logo（現在為空） //String logoImgPath = ""; File file = new File(dir); QRCodeUtil.encode(content, null, new FileOutputStream(file), true); } } 呼叫方法QRCodeUtil.encode public class GudingzichanService extends CommonService { //建立路徑 public static class FileUtil { /** * @param dir * void * TODO 判斷路徑是否存在，如果不存在則建立 */ public static void mkdirs(String dir){ if(StringUtils.isNullOrEmpty(dir)){ return; } File file = new File(dir); if(file.isDirectory()){ return; } else { file.mkdirs(); } } } public static class QRCodeUtil { private static final String CHARSET = "UTF-8"; private static final String FORMAT_NAME = "JPG"; // 二維碼尺寸 private static final int QRCODE_SIZE = 200; // LOGO寬度 private static final int WIDTH = 60; // LOGO高度 private static final int HEIGHT = 60; /** * @param content 二維碼內容 * @param logoImgPath Logo * @param needCompress 是否壓縮Logo * @return 返回二維碼圖片 * @throws WriterException * @throws IOException * BufferedImage * TODO 建立二維碼圖片 */ private static BufferedImage createImage(String content, String logoImgPath, boolean needCompress) throws WriterException, IOException { Hashtable<EncodeHintType, Object> hints = newHashtable<EncodeHintType, Object>(); 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 (logoImgPath == null || "".equals(logoImgPath)) { return image; } // 插入圖片 QRCodeUtil.insertImage(image, logoImgPath, needCompress); return image; } /** * @param source 二維碼圖片 * @param logoImgPath Logo * @param needCompress 是否壓縮Logo * @throws IOException * void * TODO 新增Logo */ private static void insertImage(BufferedImage source, String logoImgPath, boolean needCompress) throws IOException{ File file = new File(logoImgPath); if (!file.exists()) { return; } Image src = ImageIO.read(new File(logoImgPath)); int width = src.getWidth(null); int height = src.getHeight(null); if (needCompress) { // 壓縮LOGO if (width > WIDTH) { width = WIDTH; } if (height > HEIGHT) { height = 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); // 繪製縮小後的圖 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(); } /** * @param content 二維碼內容 * @param logoImgPath Logo * @param destPath 二維碼輸出路徑 * @param needCompress 是否壓縮Logo * @throws Exception * void * TODO 生成帶Logo的二維碼 */ public static void encode(String content, String logoImgPath, String destPath, boolean needCompress) throws Exception { BufferedImage image = QRCodeUtil.createImage(content, logoImgPath, needCompress); FileUtil.mkdirs(destPath); ImageIO.write(image, FORMAT_NAME, new File(destPath)); } /** * @param content 二維碼內容 * @param destPath 二維碼輸出路徑 * @throws Exception * void * TODO 生成不帶Logo的二維碼 */ public static void encode(String content, String destPath) throws Exception { QRCodeUtil.encode(content, null, destPath, false); } /** * @param content 二維碼內容 * @param logoImgPath Logo * @param output 輸出流 * @param needCompress 是否壓縮Logo * @throws Exception * void * TODO 生成帶Logo的二維碼，並輸出到指定的輸出流 */ public static void encode(String content, String logoImgPath, OutputStream output, boolean needCompress) throws Exception { BufferedImage image = QRCodeUtil.createImage(content, logoImgPath, needCompress); ImageIO.write(image, FORMAT_NAME, output); } /** * @param content 二維碼內容 * @param output 輸出流 * @throws Exception * void * TODO 生成不帶Logo的二維碼，並輸出到指定的輸出流 */ public static void encode(String content, OutputStream output) throws Exception { QRCodeUtil.encode(content, null, output, false); } /** * @param file 二維碼 * @return 返回解析得到的二維碼內容 * @throws Exception * String * TODO 二維碼解析 */ 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<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>(); hints.put(DecodeHintType.CHARACTER_SET, CHARSET); result = new MultiFormatReader().decode(bitmap, hints); String resultStr = result.getText(); return resultStr; } /** * @param path 二維碼儲存位置 * @return 返回解析得到的二維碼內容 * @throws Exception * String * TODO 二維碼解析 */ public static String decode(String path) throws Exception { return QRCodeUtil.decode(new File(path)); } } } 附： pom.xml檔案的依賴 <!-- 二維碼 --> <dependency> <groupId>com.google.zxing</groupId> <artifactId>core</artifactId> <version>3.3.3</version> </dependency> <dependency> <groupId>com.google.zxing</groupId> <artifactId>javase</artifactId> <version>3.0.0</version> </dependency>