zxing与qrcode是两种不同的生成二维码的方式,zxing是谷歌公司的,qrcode是日本Denso公司的。
我这里介绍一下zxing这种方式
第一步:导入zxing的core-2.2.jar(版本过高,相应的的jdk版本要求也高)
第二步:编写MatrixToImageWriter 这个类,可以把二维码转成图片
第三步:在main方法中调用,具体步骤看代码
public class CreateQrCode{
private static final int BLACK = 0xFF000000;
private static final int WHITE = 0xFFFFFFFF;
public CreateQrCode(){}
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);
}
}
public static void main(String[] args) {
//设置你想要的内容
String text = "这是我生成的二维码!";
//设置宽高
int width = 300;
int height = 300;
String format = "jpg";
HashMap<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();
//设置字符格式
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
//设置白边大小
hints.put(EncodeHintType.MARGIN, 1);
try {
BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height, hints);
//图片存放地址
File file = new File("G:\\test\\qrcode.jpg");
CreateQrCode.writeToFile(bitMatrix, format, file);
} catch (WriterException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
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