通过zxing生成二维码

1、项目中导入code-3.3.0.jar以及javase-3.3.0.jar两个包

2、二维码生成

	//生成二维码图片
	public static void createQrImg(File outputFile, String content, String format, Integer height, Integer width)
			throws WriterException, FileNotFoundException, IOException
	{
		if (outputFile == null)
			throw new WriterException("Parameter: ouputFile is null.");
		if (content == null)
			throw new WriterException("Parameter: content is null.");
		// jpg、jpeg、png、gif、bmp、tiff、ai、cdr、eps
		List<String> formats = Arrays.asList("jpg", "jpeg", "png", "gif", "bmp", "tiff");
		//默认使用jpg格式
		if (format == null)
			format = "jpg";
		format = format.trim();
		if (!formats.contains(format.toLowerCase()))
			throw new WriterException("Parameter: format is not in " + formats.toString() + ".");

		if (outputFile.getParentFile() != null && !outputFile.getParentFile().exists())
			outputFile.getParentFile().mkdirs();

		if (height == null || height <= 0)
			height = 180;
		if (width == null || width <= 0)
			width = 180;

		Map<EncodeHintType, Object> hints = new LinkedHashMap<EncodeHintType, Object>();
		hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
		//定义纠错等级为M
		hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
		BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints);
		
		bitMatrix = deleteWhite(bitMatrix);
		MatrixToImageWriter.writeToStream(bitMatrix, format, new FileOutputStream(outputFile));
		
		addLogo(outputFile,format);
	}
	
	//在二维码中间添加logo
	private static void addLogo(File outputFile, String format)
	{
		Graphics g = null;
		BufferedImage combinedImg = null;
		try
		{
			String path = "xxx/logo.png";

			File file = new File(path);
			file.createNewFile();

			Image logo = ImageIO.read(file);

			BufferedImage outputImg = ImageIO.read(outputFile);
			combinedImg = new BufferedImage(outputImg.getWidth(), outputImg.getHeight(),
					BufferedImage.TYPE_INT_RGB);

			g = combinedImg.getGraphics();
			g.drawImage(outputImg, 0, 0, null);
			//图片放二维码中间
			g.drawImage(logo, (outputImg.getWidth() - logo.getWidth(null)) / 2,
					(outputImg.getHeight() - logo.getHeight(null)) / 2, null);
			ImageIO.write(combinedImg, format, outputFile);

		}
		catch (Throwable e)
		{
			System.out.println("Error in add QRCode image!");
		}
		finally
		{
			if (g != null)
			{
				g.dispose();
			}
		}
	}
	
	//去掉生成的二维码四周的白色边框
	private 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;
	}

3、二维码解析    

	//截取屏幕中间的二维码并将其解析
    public static String getQrCodeInfo(){  
        try 
        {        
        	//截图，截取屏幕中间四分之一的位置
        	Dimension d=Toolkit.getDefaultToolkit().getScreenSize(); 
        	//copy the screen to a BufferedImage , only get the one fourth screenshot  
            BufferedImage screenshot=(new Robot()).createScreenCapture(  
                    new Rectangle((int)d.getWidth()/4,(int)d.getHeight()/8,(int)(2*d.getWidth()/4),(int)(5*d.getHeight()/8)));   
            //将截图的照片放到指定位置
            //String userName = System.getenv("username");
            //ImageIO.write(screenshot, "png", new File("C:\\Users\\" + userName + "\\a.png"));
            
            //开始解析二维码，若只是解析某个目录下的二维码，则去掉上面代码然后将screenshot换成对应位置图片信息即可
            LuminanceSource source = new BufferedImageLuminanceSource(screenshot);  
            Binarizer binarizer = new HybridBinarizer(source);  
            BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);  
            Map<DecodeHintType, Object> hints = new HashMap<DecodeHintType, Object>();  
            hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");  
            Result result = new MultiFormatReader().decode(binaryBitmap, hints);
            return result.getText(); 
        } 
        catch (Exception e) 
        {  
            System.out.println("analysis the qrcode has error , the error msg is " + e.getMessage());
           
        }
        return null;
    }