ZxingUtils.java

package com.alipay.demo.trade.utils;

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

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

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class ZxingUtils {
    private static Log log = LogFactory.getLog(ZxingUtils.class);
    private static final int BLACK = -16777216;
    private static final int WHITE = -1;

    private static BufferedImage toBufferedImage(BitMatrix matrix) {
        int width = matrix.getWidth();
        int height = matrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, 1);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                image.setRGB(x, y, matrix.get(x, y) ? -16777216 : -1);
            }
        }
        return image;
    }

    private static void writeToFile(BitMatrix matrix, String format, File file) throws IOException {
        BufferedImage image = toBufferedImage(matrix);
        if (!ImageIO.write(image, format, file))
            throw new IOException("Could not write an image of format " + format + " to " + file);
    }

    public static File getQRCodeImge(String contents, int width, String imgPath) {
        return getQRCodeImge(contents, width, width, imgPath);
    }

    public static File getQRCodeImge(String contents, int width, int height, String imgPath) {
        try {
            Map hints = new Hashtable();
            hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
            hints.put(EncodeHintType.CHARACTER_SET, "UTF8");

            BitMatrix bitMatrix = new MultiFormatWriter().encode(contents, BarcodeFormat.QR_CODE, width, height, hints);

            File imageFile = new File(imgPath);
            writeToFile(bitMatrix, "png", imageFile);

            return imageFile;
        } catch (Exception e) {
            log.error("create QR code error!", e);
        }
        return null;
    }
}