java代码解析二维码一般步骤

本文采用的是google的zxing技术进行解析二维码技术，解析二维码的一般步骤如下：

一、下载zxing-core的jar包：

 

二、创建一个BufferedImageLuminanceSource类继承LuminanceSource，此类在google的源码中有，但是为了使用方便，下面有此类的源码，可以直接复制使用：

private final BufferedImage image;	private final int left;	private final int top;	public BufferedImageLuminanceSource(BufferedImage image) {		this(image, 0, 0, image.getWidth(), image.getHeight());	}	public BufferedImageLuminanceSource(BufferedImage image, int left, int top, int width, int height) {		super(width, height);		int sourceWidth = image.getWidth();		int sourceHeight = image.getHeight();		if (left + width > sourceWidth || top + height > sourceHeight) {			throw new IllegalArgumentException("Crop rectangle does not fit within image data.");		}		for (int y = top; y < top + height; y++) {			for (int x = left; x < left + width; x++) {				if ((image.getRGB(x, y) & 0xFF000000) == 0) {					image.setRGB(x, y, 0xFFFFFFFF); // = white				}			}		}		this.image = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_BYTE_GRAY);		this.image.getGraphics().drawImage(image, 0, 0, null);		this.left = left;		this.top = top;	}	@Override	public byte[] getRow(int y, byte[] row) {		if (y < 0 || y >= getHeight()) {			throw new IllegalArgumentException("Requested row is outside the image: " + y);		}		int width = getWidth();		if (row == null || row.length < width) {			row = new byte[width];		}		image.getRaster().getDataElements(left, top + y, width, 1, row);		return row;	}	@Override	public byte[] getMatrix() {		int width = getWidth();		int height = getHeight();		int area = width * height;		byte[] matrix = new byte[area];		image.getRaster().getDataElements(left, top, width, height, matrix);		return matrix;	}	@Override	public boolean isCropSupported() {		return true;	}	@Override	public LuminanceSource crop(int left, int top, int width, int height) {		return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height);	}	@Override	public boolean isRotateSupported() {		return true;	}	@Override	public LuminanceSource rotateCounterClockwise() {		int sourceWidth = image.getWidth();		int sourceHeight = image.getHeight();		AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0, 0.0, 0.0, sourceWidth);		BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, BufferedImage.TYPE_BYTE_GRAY);		Graphics2D g = rotatedImage.createGraphics();		g.drawImage(image, transform, null);		g.dispose();		int width = getWidth();		return new BufferedImageLuminanceSource(rotatedImage, top, sourceWidth - (left + width), getHeight(), width);	}

三、创建一个启动类，用来解析二维码：

public static void main(String[] args) {		try {	        MultiFormatReader formatReader = new MultiFormatReader();	        String filePath = "D:/test/博客.jpg";	        File file = new File(filePath);	        BufferedImage image = ImageIO.read(file);	        LuminanceSource source = new BufferedImageLuminanceSource(image);	        Binarizer  binarizer = new HybridBinarizer(source);	        BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);	        Map hints = new HashMap();	        //解码设置为UTF-8	        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");	        //优化精度	        hints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);	        //复杂模式，开启PURE_BARCODE模式	        hints.put(DecodeHintType.PURE_BARCODE, Boolean.TRUE);	        Result result = formatReader.decode(binaryBitmap,hints);	        System.out.println("result = "+ result.toString());	        System.out.println("resultFormat = "+ result.getBarcodeFormat());	        System.out.println("resultText = "+ result.getText());	        		} catch (Exception e) {			e.printStackTrace();		}	}

四、经过亲自测试可以实现对二维码的解析，可以获取二维码的url等信息；