Java生成二维码图片

生成二维码图片

新建 Maven Project&＃xff0c;引入依赖&＃xff1a;

<dependency><groupId>com.google.zxinggroupId><artifactId>coreartifactId><version>3.3.0version>
dependency><dependency><groupId>com.google.zxinggroupId><artifactId>javaseartifactId><version>3.3.0version>
dependency>


新建 QrCodeUtils 工具类&＃xff1a;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.file.Path;
import java.util.HashMap;
import java.util.Map;import javax.imageio.ImageIO;import com.google.zxing.BarcodeFormat;
import com.google.zxing.Binarizer;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.EncodeHintType;
import com.google.zxing.LuminanceSource;
import com.google.zxing.MultiFormatReader;
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.QRCodeWriter;public class QrCodeUtils {private static final BarcodeFormat BARCODE_FORMAT &＃61; BarcodeFormat.QR_CODE;private static final QRCodeWriter qrCodeWriter &＃61; new QRCodeWriter();private static final MultiFormatReader multiFormatReader &＃61; new MultiFormatReader();public static BitMatrix encode(String contents, int width, int height, Map<EncodeHintType, Object> hints) throws WriterException {BitMatrix bitMatrix &＃61; qrCodeWriter.encode(contents, BARCODE_FORMAT, width, height, hints);return bitMatrix;}public static Result decode(File input) throws IOException, NotFoundException {BufferedImage bufferedImage &＃61; ImageIO.read(input);LuminanceSource luminanceSource &＃61; new BufferedImageLuminanceSource(bufferedImage);Binarizer binarizer &＃61; new HybridBinarizer(luminanceSource);BinaryBitmap binaryBitmap &＃61; new BinaryBitmap(binarizer);Map<DecodeHintType, Object> hints &＃61; new HashMap<DecodeHintType, Object>();hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");return multiFormatReader.decode(binaryBitmap, hints);}public static void writeToPah(BitMatrix matrix, String format, File file) throws IOException {MatrixToImageWriter.writeToPath(matrix, format, file.toPath());}public static void writeToPah(BitMatrix matrix, String format, Path file) throws IOException {MatrixToImageWriter.writeToPath(matrix, format, file);}public static void writeToStream(BitMatrix matrix, String format, OutputStream stream) throws IOException {MatrixToImageWriter.writeToStream(matrix, format, stream);}
}


测试类&＃xff1a;

import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;import com.google.zxing.EncodeHintType;
import com.google.zxing.NotFoundException;
import com.google.zxing.Result;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;public class Test {public static void main(String[] args) throws WriterException, IOException, NotFoundException {File file &＃61; new File("二维码&＃xff08;QrCode&＃xff09;.png");String contents &＃61; file.getName();Map<EncodeHintType, Object> hints &＃61; new HashMap<EncodeHintType, Object>();hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);hints.put(EncodeHintType.MARGIN, 1);BitMatrix bitMatrix &＃61; QrCodeUtils.encode(contents, 800, 800, hints);QrCodeUtils.writeToPah(bitMatrix, "PNG", file); // 生成二维码图片// ByteArrayOutputStream stream &＃61; new ByteArrayOutputStream();
// QrCodeUtils.writeToStream(bitMatrix, "PNG", stream);
//
// byte[] byteArray &＃61; stream.toByteArray();Result result &＃61; QrCodeUtils.decode(file); // 识别二维码System.out.println(result.getText());}
}


生成的二维码图片位于项目根目录中&＃xff1a;

控制台输出&＃xff1a;

二维码&＃xff08;QrCode&＃xff09;.png


参考

Java实现二维码生成 Google-Zxing

Java识别二维码【工具类】