使用zxing进行QR码编码和解码
好的,所以我要把握机会,这里的某个人以前使用过zxing。我正在开发Java应用程序,它需要做的一件事是将字节数据数组编码为QR码,然后在以后对其进行解码。
这是我的编码器外观的示例:
byte[] b = {0x48, 0x45, 0x4C, 0x4C, 0x4F};//convert the byte array into a UTF-8 string
String data;
try {
data = new String(b, "UTF8");
}
catch (UnsupportedEncodingException e) {
//the program shouldn't be able to get here
return;
}
//get a byte matrix for the data
ByteMatrix matrix;
com.google.zxing.Writer writer = new QRCodeWriter();
try {
matrix = writer.encode(data, com.google.zxing.BarcodeFormat.QR_CODE, width, height);
}
catch (com.google.zxing.WriterException e) {
//exit the method
return;
}
//generate an image from the byte matrix
int width = matrix.getWidth();
int height = matrix.getHeight();
byte[][] array = matrix.getArray();
//create buffered image to draw to
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
//iterate through the matrix and draw the pixels to the image
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
int grayValue = array[y][x] & 0xff;
image.setRGB(x, y, (grayValue == 0 ? 0 : 0xFFFFFF));
}
}
//write the image to the output stream
ImageIO.write(image, "png", outputStream);
此代码中的开始字节数组仅用于对其进行测试。实际的字节数据将有所不同。
这是我的解码器的外观:
//get the data from the input streamBufferedImage image = ImageIO.read(inputStream);
//convert the image to a binary bitmap source
LuminanceSource source = new BufferedImageLuminanceSource(image);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
//decode the barcode
QRCodeReader reader = new QRCodeReader();
Result result;
try {
result = reader.decode(bitmap, hints);
} catch (ReaderException e) {
//the data is improperly formatted
throw new MCCDatabaseMismatchException();
}
byte[] b = result.getRawBytes();
System.out.println(ByteHelper.convertUnsignedBytesToHexString(result.getText().getBytes("UTF8")));
System.out.println(ByteHelper.convertUnsignedBytesToHexString(b));
convertUnsignedBytesToHexString(byte)
是一种将字节数组转换为十六进制字符串的方法。
当我尝试同时运行这两个代码块时,输出如下:
48454c4c4f202b0b78cc00ec11ec11ec11ec11ec11ec11ec
显然,文本已被编码,但实际的数据字节已完全关闭。任何帮助将不胜感激。
回答:
因此,为了给不想花两天时间在互联网上解决这个问题的任何人提供参考,将字节数组编码为QR码时,必须使用ISO-8859-1
字符集,而不是UTF-8
。
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