import com.google.zxing.BarcodeFormat;
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import com.google.zxing.BinaryBitmap;
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import com.google.zxing.DecodeHintType;
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import com.google.zxing.LuminanceSource;
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import com.google.zxing.MultiFormatReader;
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import com.google.zxing.NotFoundException;
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import com.google.zxing.Result;
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import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
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import com.google.zxing.common.GlobalHistogramBinarizer;
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import com.google.zxing.common.HybridBinarizer;
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import javax.imageio.ImageIO;
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import java.awt.image.BufferedImage;
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import java.io.File;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.EnumMap;
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import java.util.List;
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import java.util.Map;
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/**
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* 二维码标签解码校验
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*
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* 用法：java DecodeQr <标签目录>
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*
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* 对每张标签分别用「整图」和「裁到二维码区域」两种方式解码：
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* 整图失败而裁图成功，说明标签本身没坏，是下方文字干扰了检测器，属解码端问题；
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* 两种方式都失败，才是标签真的不可识读。
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*/
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public class DecodeQr {
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/** 标签排版参数，须与 QrCodeImageUtils 保持一致 */
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private static final int PADDING = 16;
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private static final int QR_SIZE = 260;
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/** 裁图时向外多留的余量，保证二维码静区不被切掉 */
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private static final int CROP_MARGIN = 10;
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public static void main(String[] args) throws Exception {
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if (args.length == 0) {
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System.out.println("用法: java DecodeQr <标签目录>");
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return;
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}
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File dir = new File(args[0]);
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File[] files = dir.listFiles((d, n) -> n.toLowerCase().endsWith(".png"));
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if (files == null || files.length == 0) {
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System.out.println("目录内没有 PNG 文件：" + dir.getAbsolutePath());
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return;
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}
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Arrays.sort(files);
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int fullOk = 0;
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int cropOk = 0;
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int bothFail = 0;
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List<String> fullFailCropOk = new ArrayList<>();
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List<String> hardFail = new ArrayList<>();
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List<String> mismatched = new ArrayList<>();
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String sampleContent = null;
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for (File f : files) {
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String name = f.getName();
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String code = name.endsWith(".png") ? name.substring(0, name.length() - 4) : name;
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BufferedImage image = ImageIO.read(f);
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if (image == null) {
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hardFail.add(name + " -> 图片无法读取");
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bothFail++;
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continue;
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}
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String full = decode(image);
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String crop = decode(cropQrArea(image));
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if (full != null) {
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fullOk++;
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}
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if (crop != null) {
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cropOk++;
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}
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if (full == null && crop == null) {
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bothFail++;
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hardFail.add(name + " -> 整图与裁图均解码失败");
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continue;
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}
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if (full == null) {
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fullFailCropOk.add(name);
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}
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String text = full != null ? full : crop;
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if (!text.contains(code)) {
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mismatched.add(name + " -> 内容与码值不符: " + text);
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}
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if (sampleContent == null) {
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sampleContent = "码值 " + code + "\n 二维码内容 " + text;
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}
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}
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int total = files.length;
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System.out.println("标签总数 : " + total);
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System.out.printf ("整图解码成功 : %d (%.2f%%)%n", fullOk, fullOk * 100.0 / total);
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System.out.printf ("裁图解码成功 : %d (%.2f%%)%n", cropOk, cropOk * 100.0 / total);
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System.out.printf ("两种方式都失败 : %d (%.2f%%)%n", bothFail, bothFail * 100.0 / total);
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System.out.println("整图失败但裁图成功（检测受下方文字干扰，标签本身正常）: " + fullFailCropOk.size());
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System.out.println("\n--- 样本 ---\n " + sampleContent);
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if (!fullFailCropOk.isEmpty()) {
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System.out.println("\n--- 仅整图失败的码（前 10） ---");
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fullFailCropOk.stream().limit(10).forEach(s -> System.out.println(" " + s));
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}
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if (!mismatched.isEmpty()) {
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System.out.println("\n!!! 内容与码值不符（前 10） !!!");
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mismatched.stream().limit(10).forEach(s -> System.out.println(" " + s));
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}
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if (!hardFail.isEmpty()) {
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System.out.println("\n--- 真正不可识读的标签（前 20） ---");
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hardFail.stream().limit(20).forEach(s -> System.out.println(" " + s));
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}
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}
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/** 裁出二维码所在区域，去掉下方叠加的文字 */
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private static BufferedImage cropQrArea(BufferedImage src) {
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int x = Math.max(0, PADDING - CROP_MARGIN);
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int y = Math.max(0, PADDING - CROP_MARGIN);
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int w = Math.min(src.getWidth() - x, QR_SIZE + CROP_MARGIN * 2);
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int h = Math.min(src.getHeight() - y, QR_SIZE + CROP_MARGIN * 2);
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return src.getSubimage(x, y, w, h);
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}
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/** 尝试多种二值化策略解码，全部失败返回 null */
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private static String decode(BufferedImage image) {
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LuminanceSource source = new BufferedImageLuminanceSource(image);
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Map<DecodeHintType, Object> hints = new EnumMap<>(DecodeHintType.class);
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hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");
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hints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
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hints.put(DecodeHintType.POSSIBLE_FORMATS, List.of(BarcodeFormat.QR_CODE));
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// HybridBinarizer 适合光照不均，GlobalHistogramBinarizer 对高对比度图更稳，两者互补
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for (var binarizer : List.of(new HybridBinarizer(source), new GlobalHistogramBinarizer(source))) {
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try {
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Result r = new MultiFormatReader().decode(new BinaryBitmap(binarizer), hints);
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if (r != null && r.getText() != null) {
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return r.getText();
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}
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} catch (NotFoundException ignored) {
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// 换下一种策略
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} catch (Exception ignored) {
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// 同上
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}
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}
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return null;
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}
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}
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