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Java利用Zxing生成二维码

关键词:JavaJava利用Zxing生成二维码  阅读(627) 赞(15)

[摘要]本文主要是对Java利用Zxing生成二维码的讲解,希望对大家学习Java利用Zxing生成二维码有所帮助。

  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;.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

  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

  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。



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