top.changelife.code.QRcodeUtil Maven / Gradle / Ivy

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package top.changelife.code;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Hashtable;

public class QRcodeUtil {
    private static final String CHARSET = "UTF-8";
    private static final String FORMAT_NAME = "JPG";
    private static final int QRCODE_SIZE = 200;

    public static void createQRcode(String content, String codePath) throws Exception {
        BufferedImage image = createImage(content);
        mkdirs(codePath);
        ImageIO.write(image, FORMAT_NAME, new File(codePath));
    }

    private static BufferedImage createImage(String content) throws WriterException, IOException {
        Hashtable hints = new Hashtable();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);
        int width = bitMatrix.getWidth();
        int height = bitMatrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
            }
        }
        return image;
    }

    public static void mkdirs(String dir) {
        if (dir == null || dir.trim() == "") {
            return;
        }
        File file = new File(dir);
        if (file.isDirectory()) {
            return;
        } else {
            file.mkdirs();
        }
    }
}