MatrixUtil

/**
* 使用ZXing，生成条码的辅助类。可以编码、解码。编码使用code包，解码需要javase包。
*/
public final class MatrixUtil {

private static final String CHARSET = "utf-8";
private static final int BLACK = 0xFF000000;
private static final int WHITE = 0xFFFFFFFF;

/**
* 禁止生成实例，生成实例也没有意义。
*/
private MatrixUtil() {
}

/**
* 生成矩阵，是一个简单的函数，参数固定，更多的是使用示范
*
* @param text
* @return
*/
public static BitMatrix toQRCodeMatrix(String text, Integer width,
   Integer height, String eclevel) {
  if (width == null || width > 300) {
   width = 300;
  }

  if (height == null || height > 300) {
   height = 300;
  }
  // 二维码的图片格式
//  Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
  Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();

  hints.put(EncodeHintType.CHARACTER_SET, CHARSET); //内容所使用编码使用小写的编码，大写会出现]Q2\000026开头内容
  hints.put(EncodeHintType.MARGIN, 0); ////margin 边框设置
  hints.put(EncodeHintType.MAX_SIZE, 773);
  hints.put(EncodeHintType.MIN_SIZE, 310);

  //ErrorCorrectionLevel.H 容错率：容错率越高,二维码的有效像素点就越多.
  eclevel = eclevel == null ? "" : eclevel.toUpperCase();
  if (eclevel.equals("M")) {
   hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
  }else if (eclevel.equals("L")) {
   hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
  }else if (eclevel.equals("Q")) {
   hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.Q);
  }else if (eclevel.equals("H")) {
   hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
  }else{
   hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
  }

  BitMatrix bitMatrix = null;
  try {
   bitMatrix = new MultiFormatWriter().encode(text,
     BarcodeFormat.QR_CODE, width, height, hints);
  } catch (WriterException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  // 生成二维码
  // File outputFile = new File("d:"+File.separator+"new.gif");
  // MatrixUtil.writeToFile(bitMatrix, format, outputFile);
  return bitMatrix;
}

/**
* 将指定的字符串生成二维码图片。简单的使用示例
*
* @param text
* @param file
* @param format
* @return
*/
public boolean toQrcodeFile(String text, File file, String format) {
  BitMatrix matrix = toQRCodeMatrix(text, null, null, null);
  if (matrix != null) {
   try {
    writeToFile(matrix, format, file);
    return true;
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
  }
  return false;
}

/**
* 根据点矩阵生成黑白图
*/
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;
}

/**
* 将字符串编成一维条码的矩阵
*
* @param str
* @param width
* @param height
* @return
*/
public static BitMatrix toBarCodeMatrix(String str, Integer width,
Integer height) {

  if (width == null || width < 200) {
   width = 200;
  }

  if (height == null || height < 50) {
   height = 50;
  }

  try {
   // 文字编码
   Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
   hints.put(EncodeHintType.CHARACTER_SET, CHARSET);

BitMatrix bitMatrix = new MultiFormatWriter().encode(str,
BarcodeFormat.CODE_128, width, height, hints);

   return bitMatrix;
  } catch (Exception e) {
   e.printStackTrace();
  }
  return null;
}

/**
* 根据矩阵、图片格式，生成文件
*/
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);
  }
}

/**
* 将矩阵写入到输出流中
*/
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);
  }
}

/**
* 解码，需要javase包。
*
* @param file
* @return
*/
public static String decode(File file) {

  BufferedImage image;
  try {
   if (file == null || file.exists() == false) {
    throw new Exception(" File not found:" + file.getPath());
   }

image = ImageIO.read(file);

LuminanceSource source = new BufferedImageLuminanceSource(image);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

Result result;

   // 解码设置编码方式为：utf-8，
   Hashtable hints = new Hashtable();
   hints.put(DecodeHintType.CHARACTER_SET, CHARSET);

result = new MultiFormatReader().decode(bitmap, hints);

return result.getText();

  } catch (Exception e) {
   e.printStackTrace();
  }

return null;
}

/**
* 测试函数。简单地将指定的字符串生成二维码图片
*/
public static void main(String[] args) throws Exception {
  String text = "http://g.click.taobao.com/q?pid=mm_14153868_4088432_13314443&rd=2&ct=url%3Dhttp%253A%252F%252Fwww.taobao.com&rf=http%3A%2F%2Fwww.showyounger.com%2Fwebsite&et=30886910&pgid=0792b8cdb6c3121791fe266d1e44fda9&v=1.1";
  String result;
  String format = "gif";
  // 生成二维码
  File outputFile = new File("d:/test/qrcode.gif");
  MatrixUtil.writeToFile(MatrixUtil.toQRCodeMatrix(text, 256, 256, "L"),
    format, outputFile);
  result = MatrixUtil.decode(outputFile);
  System.out.println(result);

//  outputFile = new File("d:/test/barcode.gif");
//  MatrixUtil.writeToFile(MatrixUtil.toBarCodeMatrix(text, null, null),
//    format, outputFile);
//
//  result = MatrixUtil.decode(outputFile);
//  System.out.println(result);
}

}

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