Java 生成二维码

Java生成二维码工具

使用google条码解析库zxing.
功能: 为给定字符串生成二维码
1. 返回BufferImage格式
2. 写入到指定文件中
3. 写入到OutputStream中
代码如下:

package org.ramer.common.utils;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.io.OutputStream;import java.util.Hashtable;import javax.imageio.ImageIO;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;/** *  The QR code util. * * @author RAMER * @date Apr 19, 2017 */public class QRcodeUtil{    private static final int BLACK = 0xFF000000;    private static final int WHITE = 0xFFFFFFFF;    /**     * Generate QR code img.     *     * @param content the content     * @param width the width     * @param height the height     * @return the buffered image     */    public static BufferedImage generateQRcodeImg(String content, Integer width, Integer height) {        BitMatrix bitMatrix = null;        Hashtable<EncodeHintType, Object> hints = new Hashtable<>();        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");        hints.put(EncodeHintType.MARGIN, 0);        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);        try {            bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints);        } catch (WriterException e) {            e.printStackTrace();            return null;        }        int w = bitMatrix.getWidth();        int h = bitMatrix.getHeight();        BufferedImage bufferedImage = new BufferedImage(w, h, BufferedImage.TYPE_INT_BGR);        for (int x = 0; x < w; x++) {            for (int y = 0; y < h; y++) {                bufferedImage.setRGB(x, y, bitMatrix.get(x, y) ? BLACK : WHITE);            }        }        return bufferedImage;    }    /**     * Generate QR code file.     *     * @param content the content     * @param width the width     * @param height the height     * @param format the format,eg: gif,jpeg     * @param file the file     * @return the file   null ,if exec error.     */    public static File generateQRcodeFile(String content, Integer width, Integer height,         String format, File file) {        if (!file.exists()) {            try {                file.createNewFile();            } catch (IOException e) {                e.printStackTrace();                return null;            }        }        BufferedImage bufferedImage = generateQRcodeImg(content, width, height);        try {            ImageIO.write(bufferedImage, format, file);        } catch (IOException e) {            e.printStackTrace();            return null;        }        return file;    }    /**     * Write to stream.     *     * @param content the content     * @param width the width     * @param height the height     * @param format the format,eg: gif,jpeg     * @param outputStream the output stream     */    public static void writeToStream(String content, Integer width, Integer height,        String format,OutputStream outputStream) {        BufferedImage bufferedImage = generateQRcodeImg(content, width, height);        try {            ImageIO.write(bufferedImage, format, outputStream);        } catch (IOException e) {            e.printStackTrace();        }    }}

测试:

public class QRcodeUtilTest{    @Test    public void testGenerateQRcodeFile() {        File file = new File("Z:/Desktop/qrcode-ramer.jpeg");        QRcodeUtil.generateQRcodeFile("ramer", 80, 80, "jpeg", file);    }    @Test    public void testWriteToStream() {        try (FileOutputStream outputStream = new FileOutputStream(            new File("Z:/Desktop/qrcode2-ramer.jpeg"))) {            QRcodeUtil.writeToStream("ramer", 80, 80, "jpeg", outputStream);        } catch (IOException e) {            e.printStackTrace();        }    }}