识别PDF中二维码

实现步骤：
1.使用icepdf把pdf转化为图片
2.使用google的zxing识别图片中的二维码

包引用

    // https://central.sonatype.com/artifact/com.google.zxing/coreimplementation 'com.google.zxing:core:3.5.3'// https://central.sonatype.com/artifact/com.google.zxing/javaseimplementation 'com.google.zxing:javase:3.5.3'// https://central.sonatype.com/artifact/org.icepdf.os/icepdf-coreimplementation('org.icepdf.os:icepdf-core:6.2.2') {exclude group: 'javax.media', module: 'jai_core'}

代码部分，一个类几个方法就实现了，还是比较简单

import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.HybridBinarizer;
import org.icepdf.core.pobjects.Document;
import org.icepdf.core.util.GraphicsRenderingHints;import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
import java.util.UUID;public class Test {//缩放比例public static float scale = 2f;//旋转角度public static float rotation = 0f;//识别PDF中的二维码public static void main(String[] args) throws Exception {long time = System.currentTimeMillis();File file = new File("C:\\Users\\yujing\\Desktop\\111.pdf");//PDF转bytebyte[] pdfBytes = fileToByte(file);//byte转imageBytebyte[] imageBytes = pdfByteToImgByte(pdfBytes);//保存到本地//byteToFile(imageBytes, new File("D:/pdf_" + UUID.randomUUID() + ".png"));//二维码识别String text = imageToQRCode(imageBytes);System.out.println(text);System.out.println("耗时：" + (System.currentTimeMillis() - time) + "ms");}/*** pdf转图片*/public static byte[] pdfByteToImgByte(byte[] pdfBytes) throws Exception {byte[] result = null;Document document = new Document();document.setByteArray(pdfBytes, 0, pdfBytes.length, "");for (int i = 0; i < document.getNumberOfPages(); i++) {BufferedImage image = (BufferedImage) document.getPageImage(i, GraphicsRenderingHints.SCREEN, org.icepdf.core.pobjects.Page.BOUNDARY_CROPBOX, rotation, scale);try {ByteArrayOutputStream bos = new ByteArrayOutputStream();ImageIO.write(image, "png", bos);result = bos.toByteArray();} catch (Exception e) {e.printStackTrace();}image.flush();}document.dispose();return result;}/*** 识别 png图片中的二维码信息*/public static String imageToQRCode(byte[] imageInByte) throws Exception {MultiFormatReader multiFormatReader = new MultiFormatReader();InputStream in = new ByteArrayInputStream(imageInByte);BufferedImage image = ImageIO.read(in);// 定义二维码参数Map<DecodeHintType, String> hints = new HashMap<>();hints.put(DecodeHintType.CHARACTER_SET, "utf-8");// 获取读取二维码结果BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(new BufferedImageLuminanceSource(image)));Result result = multiFormatReader.decode(binaryBitmap, hints);return result.getText();}public static byte[] fileToByte(File file) {if (file == null || !file.exists()) return null;try (FileInputStream stream = new FileInputStream(file); ByteArrayOutputStream out = new ByteArrayOutputStream((int) file.length())) {byte[] b = new byte[1024 * 4];int n;while ((n = stream.read(b)) != -1)out.write(b, 0, n);return out.toByteArray();} catch (IOException ignored) {}return null;}public static boolean byteToFile(byte[] bytes, File file) {if (!Objects.requireNonNull(file.getParentFile()).exists()) // 如果位置不存在file.getParentFile().mkdirs();if (file.exists()) file.delete();FileOutputStream out;try {out = new FileOutputStream(file);out.write(bytes);out.flush();out.close();} catch (FileNotFoundException e) {System.out.println("No Find File");return false;} catch (IOException e) {System.out.println("IO Error");return false;}return true;}
}