Question

首先，我阅读了所有这些主题，如何在Java中使用Zxing但总是错过了com.google.zxing.client.j2se。*（我在eclipse中加载了zxing core-3.2.1.jar和所有其他zxing包工作，除非j2se）或刚刚找到创建qr图像的解决方案......

我的目标是编写一个方法，让图像文件在此图像中找到qr代码，对qr代码进行解码并返回字符串，基本上它应该类似于以下内容：

import com.google.zxing.*;

public class QRCode {

    /*
     * ...
     */

    public String getDecodedString(SomeStandardImageType photo){
        // detect the qr code in a photo
        // create qr image from detected area in photo
        // decode the new created qr image and return the string
        return "This is the decoded dataString from the qr code in the photo";
    }

}

总结一下该方法应该得到如下图像文件

并且应该返回url或者如果失败只是“”。

代码应与Zxing 3.2.1兼容。

编辑：问题已解决。对于对此感兴趣的其他人，我想说将外部广告core-3.2.1.jar 和 javase-3.2.1.jar添加到外部广告箱非常重要。我的答案没有后者，但取决于android图像库。

Answer 1

这里是创建Qr-Code并从Qr-code

读取消息的代码

您需要构建zxing库

主要描述qr代码创建和qr代码提取

package com.attendance.mark;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.NotFoundException;
import com.google.zxing.Result;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

public class QRCode {

    /**
     * 
     * @param args 
     * @throws WriterException
     * @throws IOException
     * @throws NotFoundException
     */
  public static void main(String[] args) throws WriterException, IOException,
      NotFoundException {
    String qrCodeData = "student3232_2015_12_15_10_29_46_123";
    String filePath = "F:\\Opulent_ProjectsDirectory_2015-2016\\.metadata\\.plugins\\org.eclipse.wst.server.core\\tmp0\\wtpwebapps\\AttendanceUsingQRCode\\QRCodes\\student3232_2015_12_15_10_29_46_123";
    String charset = "UTF-8"; // or "ISO-8859-1"
    Map<EncodeHintType, ErrorCorrectionLevel> hintMap = new HashMap<EncodeHintType, ErrorCorrectionLevel>();
    hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);

    createQRCode(qrCodeData, filePath, charset, hintMap, 200, 200);
    System.out.println("QR Code image created successfully!");

    System.out.println("Data read from QR Code: "
        + readQRCode(filePath, charset, hintMap));

  }

  /***
   * 
   * @param qrCodeData
   * @param filePath
   * @param charset
   * @param hintMap
   * @param qrCodeheight
   * @param qrCodewidth
   * @throws WriterException
   * @throws IOException
   */
  public static void createQRCode(String qrCodeData, String filePath,
      String charset, Map hintMap, int qrCodeheight, int qrCodewidth)
      throws WriterException, IOException {
    BitMatrix matrix = new MultiFormatWriter().encode(
        new String(qrCodeData.getBytes(charset), charset),
        BarcodeFormat.QR_CODE, qrCodewidth, qrCodeheight);
    MatrixToImageWriter.writeToFile(matrix, filePath.substring(filePath
        .lastIndexOf('.') + 1), new File(filePath));
  }

  /**
   * 
   * @param filePath
   * @param charset
   * @param hintMap
   * 
   * @return Qr Code value 
   * 
   * @throws FileNotFoundException
   * @throws IOException
   * @throws NotFoundException
   */
  public static String readQRCode(String filePath, String charset, Map hintMap)
      throws FileNotFoundException, IOException, NotFoundException {
    BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(
        new BufferedImageLuminanceSource(
            ImageIO.read(new FileInputStream(filePath)))));
    Result qrCodeResult = new MultiFormatReader().decode(binaryBitmap);
    return qrCodeResult.getText();
  }
}

Answer 2

这段代码对我来说很好。希望它有助于只导入必要的包，它应该工作

public class QR_Reader extends JFrame implements Runnable, ThreadFactory {

private static final long serialVersionUID = 6441489157408381878L;

private Executor executor = Executors.newSingleThreadExecutor(this);

private Webcam webcam = null;
private WebcamPanel panel = null;
String s;

public QR_Reader() {
    super();
    setLayout(new FlowLayout());
    setTitle("Reading QR Code");
    Dimension size = WebcamResolution.QVGA.getSize();
    webcam = Webcam.getWebcams().get(0);
    webcam.setViewSize(size);
    panel = new WebcamPanel(webcam);
    panel.setPreferredSize(size);
    add(panel);
    pack();
    setVisible(true);
    setResizable(false);
    executor.execute(this);
}
@Override
public void run() {

    do {
        try {
            Thread.sleep(100);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        Result result = null;
        BufferedImage image = null;

        if (webcam.isOpen()) {

            if ((image = webcam.getImage()) == null) {
                continue;
            }

            LuminanceSource source = new BufferedImageLuminanceSource(image);
            BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

            try {
                result = new MultiFormatReader().decode(bitmap);
            } catch (NotFoundException e) {
                // fall thru, it means there is no QR code in image
            }
        }

        if (result != null) {
            String time_then=result.getText();  //this is the text extracted from QR CODE
            webcam.close();
            this.setVisible(false);
            this.dispose();
            try {
                new Compare().C_Main(time_then);
            } catch (ParseException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

    } while (true);
}

@Override
public Thread newThread(Runnable r) {
    Thread t = new Thread(r, "example-runner");
    t.setDaemon(true);
    return t;
}

void QRC_Main() {
    new QR_Reader();
}
}

Answer 3

我现在更深入地阅读Zxing，下面的代码将与Zxing v3.2.1一起使用（此代码不使用// Imports import android.graphics.Bitmap; import android.graphics.BitmapFactory; import com.google.zxing.BinaryBitmap; import com.google.zxing.ChecksumException; import com.google.zxing.FormatException; import com.google.zxing.LuminanceSource; import com.google.zxing.NotFoundException; import com.google.zxing.RGBLuminanceSource; import com.google.zxing.Reader; import com.google.zxing.Result; import com.google.zxing.common.HybridBinarizer; import com.google.zxing.qrcode.QRCodeReader; // Interesting method public static String decodeQRImage(String path) { Bitmap bMap = BitmapFactory.decodeFile(path); String decoded = null; int[] intArray = new int[bMap.getWidth() * bMap.getHeight()]; bMap.getPixels(intArray, 0, bMap.getWidth(), 0, 0, bMap.getWidth(), bMap.getHeight()); LuminanceSource source = new RGBLuminanceSource(bMap.getWidth(), bMap.getHeight(), intArray); BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source)); Reader reader = new QRCodeReader(); try { Result result = reader.decode(bitmap); decoded = result.getText(); } catch (NotFoundException e) { e.printStackTrace(); } catch (ChecksumException e) { e.printStackTrace(); } catch (FormatException e) { e.printStackTrace(); } return decoded; } lib）

<ScrollView
    android:id="@+id/scrollView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentRight="true"
    android:layout_alignTop="@+id/backgroundView1"
    android:fadingEdge="none"
    android:scrollbars="none"
    android:paddingTop="5dp"
    android:paddingBottom="5dp">

    <RelativeLayout
        android:id="@+id/innerLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="5dp"
        android:layout_marginBottom="5dp">
    </RelativeLayout>
</ScrollView>

在图像中查找QR码并使用Zxing

3 个答案: