package com.ruoyi.other.util;
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import com.google.zxing.BarcodeFormat;
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import com.google.zxing.EncodeHintType;
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import com.google.zxing.MultiFormatWriter;
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import com.google.zxing.common.BitMatrix;
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import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
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import javax.imageio.ImageIO;
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import java.awt.image.BufferedImage;
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import java.io.OutputStream;
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import java.util.Hashtable;
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public class QRCodeUtils {
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private static final String CHARSET = "utf-8";
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private static final String FORMAT_NAME = "JPG";
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private static final int QRCODE_SIZE = 300;
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private QRCodeUtils() {
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}
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public static void encode(String content, OutputStream output) throws Exception {
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Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
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hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
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hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
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hints.put(EncodeHintType.MARGIN, 1);
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BitMatrix bitMatrix = new MultiFormatWriter().encode(
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content,
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BarcodeFormat.QR_CODE,
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QRCODE_SIZE,
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QRCODE_SIZE,
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hints
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);
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BufferedImage image = new BufferedImage(QRCODE_SIZE, QRCODE_SIZE, BufferedImage.TYPE_INT_RGB);
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for (int x = 0; x < QRCODE_SIZE; x++) {
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for (int y = 0; y < QRCODE_SIZE; y++) {
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image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
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}
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}
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ImageIO.write(image, FORMAT_NAME, output);
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}
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}
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