二维码生成和识别

最新推荐文章于 2024-07-10 00:00:00 发布

weixin_34033624

最新推荐文章于 2024-07-10 00:00:00 发布

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原文链接：https://my.oschina.net/wxiwei/blog/746754

目前二维生码生成主要有2种方式，qrcode和zxing，下面是zxing生成和识别代码

代码需要引com.google.zxing的core和javase包，

<dependency>
   <groupId>com.google.zxing</groupId>
   <artifactId>core</artifactId>
   <version>3.2.1</version>
</dependency>
<dependency>
   <groupId>com.google.zxing</groupId>
   <artifactId>javase</artifactId>
   <version>3.2.1</version>

</dependency>

生成二维码

public void encode()
{
try
{
String str = "https://my.oschina.net/wxiwei; 我是二维码， I am is QRCode";
Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
BitMatrix bitMatrix = new MultiFormatWriter().encode(str, BarcodeFormat.QR_CODE, 300, 300, hints);
int width = bitMatrix.getWidth();
int height = bitMatrix.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, bitMatrix.get(x, y) ? Color.BLACK.getRGB() : Color.WHITE.getRGB());
}
}
// 输出到文档
File outputFile = new File("e:" + File.separator + "new.png");
if (!ImageIO.write(image, "png", outputFile))
{
throw new IOException("Could not write an image of format png to " + outputFile);
}
System.out.println(decode(outputFile.getAbsolutePath()));
}
catch(Exception e)
{
e.printStackTrace();
}
}

识别二维码

public String decode(String imgPath)
{
try
{
LuminanceSource source = new BufferedImageLuminanceSource(ImageIO.read(new File(imgPath)));
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
Hashtable<DecodeHintType, String> hints = new Hashtable<DecodeHintType, String>();
//hints.put(DecodeHintType.TRY_HARDER, "true");
hints.put(DecodeHintType.CHARACTER_SET, "utf-8");
Result result = new MultiFormatReader().decode(bitmap, hints);
return result.getText();
}
catch(IOException ioe)
{
ioe.printStackTrace();
}
catch(ReaderException re)
{
re.printStackTrace();
}
return "";
}