Java生成二维码

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

public final class MatrixToImageWriter {
    
    private static final int BLACK = 0xFF000000; 
    private static final int WHITE = 0xFFFFFFFF; 
        
    private MatrixToImageWriter() {} 
          
    public static BufferedImage toBufferedImage(BitMatrix matrix) { 
        int width = matrix.getWidth(); 
        int height = matrix.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, matrix.get(x, y) ? BLACK : WHITE); 
            } 
        } 
        return image; 
    } 
    
    public 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 void writeToStream(BitMatrix matrix, String format, OutputStream stream) 
            throws IOException { 
        BufferedImage image = toBufferedImage(matrix); 
        if (!ImageIO.write(image, format, stream)) { 
            throw new IOException("Could not write an image of format " + format); 
        } 
    } 
}

public static void main(String[] args) throws WriterException, IOException {
        String text = "120605181003;http://www.baidu.com"; 
        int width = 300; 
        int height = 300; 
        //二维码的图片格式 
        String format = "gif"; 
        Hashtable hints = new Hashtable(); 
        //内容所使用编码 
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); 
        BitMatrix bitMatrix = new MultiFormatWriter().encode(text, 
                BarcodeFormat.QR_CODE, width, height, hints); 
        //生成二维码 
        File outputFile = new File("d:"+File.separator+"new.gif"); 
        MatrixToImageWriter.writeToFile(bitMatrix, format, outputFile); 
    }