/ * 二维码生成解析工具类 /import com.google.zxing.*;import com.google.zxing.client.j2se.BufferedImageLuminanceSource;import com.google.zxing.common.BitMatrix;import com.google.zxing.common.HybridBinarizer;import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;import javax.imageio.ImageIO;import java.awt.*;import java.awt.geom.RoundRectangle2D;import java.awt.image.BufferedImage;import java.io.File;import java.io.OutputStream;import java.util.Hashtable;/ * 二维码生成解析工具类 */public class QRCodeUtil { / * 编码格式,采用utf-8 / private static final String UNICODE = "utf-8"; / * 图片格式 / private static final String FORMAT = "JPG"; / * 二维码宽度,单位：像素pixels / private static final int QRCODE_WIDTH = 300; / * 二维码高度,单位：像素pixels / private static final int QRCODE_HEIGHT = 300; / * LOGO宽度,单位：像素pixels / private static final int LOGO_WIDTH = 100; / * LOGO高度,单位：像素pixels / private static final int LOGO_HEIGHT = 100; / * 生成二维码图片 * * @param content 二维码内容 * @param logoPath 图片地址 * @param needCompress 是否压缩 * @return * @throws Exception */ private static BufferedImage createImage(String content, String logoPath, boolean needCompress) throws Exception { // 生成二维矩阵,编码时指定大小,不要生成了图片以后再进行缩放,这样会模糊导致识别失败 Hashtable hints = new Hashtable(); //设置zxing的二维码容错率容错率级别：L 7%, M 15%, Q 25%, H 30% //如果二维码地址比较短，推荐H,因为容错率高，容错率越高，越容易被快速扫描 //如果二维码地址比较长，生成的二维码比较密，推荐L,因为这样生成的二维码比较稀疏，容易扫描 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); //调用去除白边方法 //bitMatrix = deleteWhite(bitMatrix); 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 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(); // 绘制缩小后的图 g.drawImage(image, 0, 0, null); g.dispose(); src = image; } // 插入LOGO 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(); } / * 生成二维码(内嵌LOGO) * 调用者指定二维码文件名 * * @param content 二维码的内容 * @param logoPath 中间图片地址 * @param destPath 存储路径 * @param fileName 文件名称 * @param needCompress 是否压缩 * @return * @throws Exception */ public static void encode(String content, String logoPath, String destPath, String fileName, boolean needCompress) throws Exception { BufferedImage image = QRCodeUtil.createImage(content, logoPath, needCompress); mkdirs(destPath); //文件名称通过传递 fileName = fileName.substring(0, fileName.indexOf(".") > 0 ? fileName.indexOf(".") : fileName.length()) + "." + FORMAT.toLowerCase(); ImageIO.write(image, FORMAT, new File(destPath + "/" + fileName)); } / * 以流的形式输出生成二维码 * * @param content 二维码的内容 * @param imgPath 图片地址 * @param outputOutputStream * @param needCompress 是否压缩 * @return void * @throws Exception / public static void encode(String content, String imgPath, OutputStream output, boolean needCompress) throws Exception { BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress); ImageIO.write(image, FORMAT, output); } / * 创建文件夹， mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常) * * @param destPath */ public static void mkdirs(String destPath) { File file = new File(destPath); if (!file.exists() && !file.isDirectory()) { file.mkdirs(); } } / * 解析二维码 * * @param path 二维码图片路径 * @return String 二维码内容 * @throws Exception */ public static String decode(String path) throws Exception { 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; Hashtable hints = new Hashtable(); hints.put(DecodeHintType.CHARACTER_SET, UNICODE); result = new MultiFormatReader().decode(bitmap, hints); return result.getText(); } / * 强制将白边去掉 * * @param matrix * @return 裁剪后的二维码（实际二维码的大小） * @explain 虽然生成二维码时，已经将margin的值设为了0，但是在实际生成二维码时有时候还是会生成白色的边 * 白边的生成还与设定的二维码的宽、高及二维码内容的多少（内容越多，生成的二维码越密集）有关； * 因为是在生成二维码之后，才将白边裁掉，所以裁剪后的二维码（实际二维码的宽、高）肯定不是设置的值了 */ private static BitMatrix deleteWhite(BitMatrix matrix) { int[] rec = matrix.getEnclosingRectangle(); int resWidth = rec[2] + 1; int resHeight = rec[3] + 1; BitMatrix resMatrix = new BitMatrix(resWidth, resHeight); resMatrix.clear(); for (int i = 0; i < resWidth; i++) { for (int j = 0; j < resHeight; j++) { if (matrix.get(i + rec[0], j + rec[1])) { resMatrix.set(i, j); } } } int width = resMatrix.getWidth(); int height = resMatrix.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++) { // 0-黑色;255-白色 image.setRGB(x, y, resMatrix.get(x, y) ? 0 : 255); } } return resMatrix; } / * 测试 * * @param args * @throws Exception */ public static void main(String[] args) throws Exception { String text = "http://www.baidu.com"; //不含Logo QRCodeUtil.encode(text, null, "D:\\temp\\", "qrcode", true); //含Logo，指定二维码图片名 QRCodeUtil.encode(text, "D:\\aa.png", "d:\\temp\\", "qrcode1", true); System.out.println(QRCodeUtil.decode("d:\\temp\\qrcode1.jpg")); }}
