zxing 生成二維碼圖片 並 把圖片生成海報 同時進行壓縮

Zxing使用方式

jar包導入

<dependency>
	<groupId>com.google.zxing</groupId>
	<artifactId>core</artifactId>
	<version>3.2.0</version>
</dependency>

java代碼

生成二維碼代碼

public static BitMatrix createMatrix(int width, int height, String content) throws WriterException {
        Map<EncodeHintType, Object> config = new HashMap<>(3);
        config.put(EncodeHintType.CHARACTER_SET, "UTF-8");
        config.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
        config.put(EncodeHintType.MARGIN, 0);
        return new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, config);
}

//經過獲取二維碼的每個元素，的黑白點來 繪製二維碼圖片
 public static void main(String[] args) {
    try {
        int height = 200;
        int width = 200;
        BitMatrix bitMatrix = createMatrix(width, height, "www.baidu.com");
        BufferedImage bufferedImage = new BufferedImage(bitMatrix.getWidth(), bitMatrix.getHeight(), BufferedImage.TYPE_INT_RGB);
        for (int i = 0; i< bitMatrix.getHeight(); i++){
            for (int j = 0; j<bitMatrix.getWidth(); j++){
                bufferedImage.setRGB(i,j, bitMatrix.get(i, j) ? 0X00000000 : 0XFFFFFFFF);
            }
        }

        ImageIO.write(bufferedImage, "png", new File("e:\\tt.png"));
    } catch (Exception e) {
        e.printStackTrace();
    }
}

對圖片進行壓縮 進行變換體積的方式 能夠考慮google的(thumbnailator)

BufferedImage image = ImageIO.read(new File("e:\\logo.jpg"));
Image i = image.getScaledInstance(60, 60, Image.SCALE_SMOOTH);
BufferedImage b = new BufferedImage(60, 60, BufferedImage.TYPE_INT_RGB);
Graphics graphics = b.getGraphics();
graphics.drawImage(i, 0, 0, null);
graphics.dispose();
ImageIO.write(b, "png", new File("e:\\tt.png"));

把圖片畫到另外一個圖片上

Graphics2D graphics2D = bufferedImage.createGraphics();
  graphics2D.drawImage(i, 20, 20, 60,60, null);

圖片的尺寸不變，壓縮大小(親測試 圖片 800k 轉換成90k)

感謝：http://www.javashuo.com/article/p-frwqwzbp-ck.html

public void zipImagePic(BufferedImage bufferedImage, File file) throws IOException {
        ImageWriter imgWrier = ImageIO.getImageWritersByFormatName("jpg").next();
        ImageWriteParam imgWriteParams = new javax.imageio.plugins.jpeg.JPEGImageWriteParam(
                null);
        imgWriteParams.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
        imgWriteParams.setCompressionQuality((float)0.5);
        imgWriteParams.setProgressiveMode(ImageWriteParam.MODE_DISABLED);
        ColorModel colorModel = bufferedImage.getColorModel();
        imgWriteParams.setDestinationType(new javax.imageio.ImageTypeSpecifier(
                colorModel, colorModel.createCompatibleSampleModel(16, 16)));

//        File file = new File("e:\\new.png");
        FileOutputStream out = new FileOutputStream(file);

        imgWrier.reset();
        imgWrier.setOutput(ImageIO.createImageOutputStream(out));
        imgWrier.write(null, new IIOImage(bufferedImage, null, null),
                imgWriteParams);
        out.flush();
        out.close();
    }