Java利用Zxing生成二维码
Java利用Zxing生成二维码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。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BufferedImageLuminanceSourceimport 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;}@Overridepublic 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;}@Overridepublic byte[] getMatrix() {int width = getWidth();int height = getHeight();int area = width * height;b补充:软件开发 , Java ,
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