通过zxing生成二维码

二维码现在随处可见，在日常的开发中，也会经常涉及到二维码的生成，特别是开发一些活动或者推广方面的功能时，
二维码甚至成为必备功能点。本文介绍通过 google 的 zxing 包生成带 logo 的二维码的过程，供大家参考。

1、二维码的生成

　　1.1 将Zxing-core.jar 包加入到classpath下。可通过github获取https://github.com/zxing

　　 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。

package cn.guoqick.zxing;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import java.io.File;
import java.nio.file.Path;
import java.util.HashMap;

public class  {
    public static void main(String[] args) {
        int width = 300;
        int height = 300;
        String format = "png";
        String content = "www.guoqick.cn";
        
        HashMap hints = new HashMap();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
        hints.put(EncodeHintType.MARGIN, 2);

        try {
            BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints);
            Path file = new File("E:/code/img.png").toPath();
            MatrixToImageWriter.writeToPath(bitMatrix,format,file);
        } catch (Exception e) {
           e.printStackTrace();
        }

    }
}

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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96 大专栏  通过zxing生成二维码
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package cn.guoqick.zxing;

import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;

import com.google.zxing.LuminanceSource;

public 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();
	}

至此，整個二維碼生成及解析流程就結束了，喜歡的點點讚。。。。

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