JAVA 使用ZXing 读写二维码

1、添加依赖

<dependency>
  <groupId>com.google.zxing</groupId>
  <artifactId>core</artifactId>
  <version>3.3.2</version>
</dependency>
 
<dependency>
  <groupId>com.google.zxing</groupId>
  <artifactId>javase</artifactId>
  <version>3.3.2</version>
</dependency>

2、数据生成二维码

package com.sample.qrcode;
 
import java.io.IOException;
import java.nio.file.FileSystems;
import java.nio.file.Path;
 
import com.google.zxing.BarcodeFormat;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;
 
public class WriteQRCode {
 
  public static void main(String[] args) throws WriterException, IOException {
 
    QRCodeWriter qrCodeWriter = new QRCodeWriter();
    BitMatrix bitMatrix = qrCodeWriter.encode(
        "JavaSampleApproach\nJava Technology, Spring Framework",
        BarcodeFormat.QR_CODE,
        350, 350); // width x height
 
    Path path = FileSystems.getDefault().getPath("JSA-QRCode.png");
    MatrixToImageWriter.writeToPath(bitMatrix, "PNG", path);
  }
}

生成二维码如图

3、从二维码读取数据

package com.sample.qrcode;
 
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
 
import javax.imageio.ImageIO;
 
import com.google.zxing.BinaryBitmap;
import com.google.zxing.LuminanceSource;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.NotFoundException;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.HybridBinarizer;
 
public class ReadQRCode {
 
  public static void main(String[] args) throws IOException, NotFoundException {
 
    File QRfile = new File("JSA-QRCode.png");
 
    BufferedImage bufferedImg = ImageIO.read(QRfile);
    LuminanceSource source = new BufferedImageLuminanceSource(bufferedImg);
    BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
 
    Result result = new MultiFormatReader().decode(bitmap);
 
    System.out.println("Barcode Format: " + result.getBarcodeFormat());
    System.out.println("Content: " + result.getText());
  }
}

运行结果：

Barcode Format: QR_CODE
Content: Sample
Java Technology, Spring Framework