java生成二维码

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用到的jar包：zxing_2.2_core.jar

一、功能类：

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);     }   }}

二、主函数调用：

public static void main(String[] args) throws WriterException, IOException {String text = "test Connect！"; // 二维码内容int width = 300; // 二维码图片宽度int height = 300; // 二维码图片高度String format = "png";// 二维码的图片格式Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();hints.put(EncodeHintType.CHARACTER_SET, "utf-8");   // 内容所使用字符集编码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.png");MatrixToImageWriter.writeToFile(bitMatrix, format, outputFile);}}

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