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ZXing-core生成二维码和解析

时间:2017-07-13 22:42:00      阅读:153      评论:0      收藏:0      [点我收藏+]

标签:打开   stat   bit   character   element   nts   matrix   read   sdn   

如今二维码这么流行的时刻。也必须知道二维码是怎么生成。如今我们就来看看,是怎么生成的。

事实上主要是利用goggle公布的jar来使用:本文转自点击打开链接

1、二维码的生成

Zxing-core.jar 包增加到classpath下。


   二维码的生成须要借助MatrixToImageWriter类,该类是由Google提供的,能够将该类复制到源代码中。这里我将该类的源代码贴上,能够直接使用。

直接能够生成二维码的代码

public void test1() throws Exception{
		String content = "www.baidu.com";
	     String path = "d://";
	     
	     MultiFormatWriter multiFormatWriter = new MultiFormatWriter();//Zxing是Google提供的关于条码
	     
	     Map hints = new HashMap();
	     hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
	     BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, 400, 400,hints);//这里是照片的大小
	     File file1 = new File(path,"my.jpg");
	     MatrixToImageWriter.writeToFile(bitMatrix, "jpg", file1);
	     System.out.println("运行完成");
	}
当我们能发现,这个代码拷贝上后发现有一个MatrixToImageWriter报错,所以须要我们去找。可是这里我贴出代码,能够直接使用。

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); } } }

如今就能够d盘的根文件夹下载看生成的二维码了


二维码解析 

和生成一样,我们须要一个辅助类( BufferedImageLuminanceSource),相同该类Google也提供了,这里我相同将该类的源代码贴出来,能够直接拷贝使用个,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);
   }
 
 }

  解析二维码的代码

             MultiFormatReader formatReader = new MultiFormatReader();
             String filePath = "图片的路径";
             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();
         }

如今这样能够在控制台看到二维码的内容。

纯粹是笔记。



ZXing-core生成二维码和解析

标签:打开   stat   bit   character   element   nts   matrix   read   sdn   

原文地址:http://www.cnblogs.com/yxysuanfa/p/7163235.html

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