解析发票号码(PDF格式、图片格式、剪切板截图)

PDF格式比较简单直接读取文本内容，正则抽取发票号码
剪切板中的截图先上传base64到服务器也是转换成图片格式
解析图片中的二维码，如果解析二维码失败，则截取图处一部分，再解析直到解析成功或小到一定尺寸
【POM参考示例源码】

public static String decode(File file) {
	String code = null;
	String format = "JPEG";
	String name = file.getName().toUpperCase();
	if(name.endsWith("PDF")){
		format = "PDF";
	}else if(name.endsWith("PNG")){
		format = "PNG";
	}
	if(format.equals("PDF")){
		String txt = PDFUtil.read(file);//PDF直接读取
		code = RegularUtil.cut(txt, "发票号码:", "\n");
	}else{
		try {
			String txt = read(file);
			code = txt.split(",")[3];
		}catch (Exception ignored){}
	}
	return code;
}

public static String read(File img) {
	String content = null;
	BufferedImage image;
	int height = 0;
	try {
		image = ImageIO.read(img);
		height = image.getHeight();
		LuminanceSource source = new BufferedImageLuminanceSource(image);
		Binarizer binarizer = new HybridBinarizer(source);
		BinaryBitmap bits = new BinaryBitmap(binarizer);
		Map<DecodeHintType, Object> hints = new HashMap<>();
		hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");
		Result result = new MultiFormatReader().decode(bits, hints);//解码
		content = result.getText();
	} catch (Exception e) {
		//如果解析不出来，把图片截取左上部分(注意二维码是不是在左上),一直截取到150像素
		if(height > 300) {
			try {
				File tmp = new File("tmp_"+img.getName());
				 ImgUtil.cut(img, tmp,0, 0, height / 2, height / 2);
				content = read(tmp);
			} catch (Exception e2) {
				e2.printStackTrace();
			}
		}
	}
	return content;
}
public static void main(String [] args) throws Exception{
   System.out.println(decode(new File("D:\\bill.pdf")));
   System.out.println(decode(new File("D:\\bill.png")));
}