Java如何利用Zxing生成二维码？Zxing是Google提供的关于条码的解析工具，提供了二维码的生成与解析的方法，在此，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

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。

　　到此为止，利用Zxing生成和解析二维码就讲述演示完毕。