Zxing是Google提供的关于条码(一维码、二维码)的解析工具,提供了二维码的生成与解析的方法,现在我简单介绍一下使用Java利用Zxing生成与解析二维码
1、二维码的生成
1.1 将Zxing-core.jar 包加入到classpath下。
1.2 二维码的生成需要借助MatrixToImageWriter类,该类是由Google提供的,可以将该类拷贝到源码中,这里我将该类的源码贴上,可以直接使用。
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import com.google.zxing.common.BitMatrix; import javax.imageio.ImageIO; import java.io.File; import java.io.OutputStream; import java.io.IOException; import java.awt.image.BufferedImage; public final class MatrixToImageWriter { private static final int BLACK = 0xFF000000 ; private static final int WHITE = 0xFFFFFFFF ; private MatrixToImageWriter() {} 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); } } } |
1.3 编写生成二维码的实现代码
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try { String content = "120605181003;http://www.cnblogs.com/jtmjx" ; String path = "C:/Users/Administrator/Desktop/testImage" ; MultiFormatWriter multiFormatWriter = new MultiFormatWriter(); Map hints = new HashMap(); hints.put(EncodeHintType.CHARACTER_SET, "UTF-8" ); BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, 400 , 400 ,hints); File file1 = new File(path, "餐巾纸.jpg" ); MatrixToImageWriter.writeToFile(bitMatrix, "jpg" , file1); } catch (Exception e) { e.printStackTrace(); } |
现在运行后即可生成一张二维码图片,是不是很简单啊? 接下来我们看看如何解析二维码
2、二维码的解析
2.1 将Zxing-core.jar 包加入到classpath下。
2.2 和生成一样,我们需要一个辅助类( BufferedImageLuminanceSource),同样该类Google也提供了,这里我同样将该类的源码贴出来,可以直接拷贝使用个,省去查找的麻烦
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BufferedImageLuminanceSource import com.google.zxing.LuminanceSource; import java.awt.Graphics2D; import java.awt.geom.AffineTransform; import java.awt.image.BufferedImage; public final class BufferedImageLuminanceSource extends LuminanceSource { 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); } } |
2.3 编写解析二维码的实现代码
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try { MultiFormatReader formatReader = new MultiFormatReader(); String filePath = "C:/Users/Administrator/Desktop/testImage/test.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(); hints.put(EncodeHintType.CHARACTER_SET, "UTF-8" ); 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(); } |
现在运行后可以看到控制台打印出了二维码的内容。
到此为止,利用Zxing生成和解析二维码就讲述演示完毕,主要为自己做备忘,同时方便有需要的人。呵呵!
以上这篇Java利用Zxing生成二维码的简单实例就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持服务器之家。