二维码生成、解析工具类

public class QrCodeUtil {

/**

* 生成包含字符串信息的二维码图片

* @param outputStream 文件输出流路径

* @param content 二维码携带信息

* @param qrCodeSize 二维码图片大小

* @param imageFormat 二维码的格式

* @throws WriterException

* @throws IOException

*/

public static boolean generateQrCode(OutputStream outputStream, String content,

int qrCodeSize, String imageFormat) throws WriterException, IOException {

// 设置二维码纠错级别Map

Hashtable hintMap = new Hashtable();

hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L); // 矫错级别

QRCodeWriter qrCodeWriter = new QRCodeWriter();

// 创建比特矩阵(位矩阵)的QR码编码的字符串

BitMatrix byteMatrix = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, qrCodeSize, qrCodeSize, hintMap);

// 去除空白区域

byteMatrix = deleteWhite(byteMatrix);

// 使BufferedImage勾画QRCode

int matrixWidth = byteMatrix.getWidth();

BufferedImage image = new BufferedImage(matrixWidth, matrixWidth, BufferedImage.TYPE_INT_RGB);

// 使用比特矩阵画并保存图像

for (int i = 0; i < matrixWidth; i++) {

for (int j = 0; j < matrixWidth; j++) {

image.setRGB(i, j, byteMatrix.get(i, j) ? Color.BLACK.getRGB() : Color.WHITE.getRGB());

}

}

return ImageIO.write(image, imageFormat, outputStream);

}

/**

* 去除空白区域

* @param matrix

* @return

*/

public static BitMatrix deleteWhite(BitMatrix matrix) {

int[] rec = matrix.getEnclosingRectangle();

int resWidth = rec[2] + 1;

int resHeight = rec[3] + 1;

BitMatrix resMatrix = new BitMatrix(resWidth, resHeight);

resMatrix.clear();

for (int i = 0; i < resWidth; i++) {

for (int j = 0; j < resHeight; j++) {

if (matrix.get(i + rec[0], j + rec[1]))

resMatrix.set(i, j);

}

}

return resMatrix;

}

/**

* 读二维码并输出携带的信息

* @param inputStream

* @throws IOException

*/

public static Result readQrCode(InputStream inputStream) throws IOException {

// 从输入流中获取字符串信息

BufferedImage image = ImageIO.read(inputStream);

// 将图像转换为二进制位图源

LuminanceSource source = new BufferedImageLuminanceSource(image);

BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

QRCodeReader reader = new QRCodeReader();

Result result = null;

try {

result = reader.decode(bitmap);

} catch (ReaderException e) {

e.printStackTrace();

}

return result;

}

}