Zxing を使用して QR コード ジェネレーターに埋め込み画像を実装する

使用Zxing实现二维码生成器内嵌图片，具有一定的参考价值，具体如下：

基本思路是先使用zxing生成的二维码图片，然后读取图片，在其中插入图标，然后整个输出图片。

最近的项目中需要生成二维码，找了几个例子综合下，做出了最后的效果，二维码可以生成图片格式（jpg等）或者在web页面上显示，此片文章仅作记录，雷同之处多多，包涵。。。。

注：需要Zxing包装的工具类，大概的流程是读取内嵌的图片，将内容转化成二维码，将图片内嵌到二维码中，出图。

下面是完整代码：

import Java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Shape;
import java.awt.geom.AffineTransform;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
 
 
import javax.imageio.ImageIO;
 
 
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
 
 
public class Zxing {
 
 
private static final int BLACK = 0xFF000000;
private static final int WHITE = 0xFFFFFFFF;
// 图片宽度的一般 
 private static final int IMAGE_WIDTH = 80; 
 private static final int IMAGE_HEIGHT = 80; 
 private static final int IMAGE_HALF_WIDTH = IMAGE_WIDTH / 2; 
 private static final int FRAME_WIDTH = 2; 
  
 // 二维码写码器 
 private static MultiFormatWriter mutiWriter = new MultiFormatWriter(); 
public static void main(String[] args) {
try {
//BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, 400, 400,hints);
String content="13400000000";//二维码的内容
BufferedImage image = genBarcode(content, 400, 400, "F:\\amazed.png");
  if (!ImageIO.write(image, "jpg", new File("F:\\2122.jpg"))) {
   throw new IOException("Could not write an image of format ");
  }
 
          /**
 
           //将上面的代码换成此处，使用流读入到页面即可
 
OutputStream os = response.getOutputStream();
 
 if (!ImageIO.write(image, "jpg",os)) {
 
       throw new IOException("Could not write an image of format ");
 
      }
 
          **/
} catch (WriterException e) {
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
 
private 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;
}
private static BufferedImage genBarcode(String content, int width, 
     int height, String srcImagePath) throws WriterException, 
     IOException { 
   // 读取源图像 
   BufferedImage scaleImage = scale(srcImagePath, IMAGE_WIDTH, 
       IMAGE_HEIGHT, true); 
   int[][] srcPixels = new int[IMAGE_WIDTH][IMAGE_HEIGHT]; 
   for (int i = 0; i < scaleImage.getWidth(); i++) { 
     for (int j = 0; j < scaleImage.getHeight(); j++) { 
       srcPixels[i][j] = scaleImage.getRGB(i, j); 
     } 
   } 
  
   Map<EncodeHintType, Object> hint = new HashMap<EncodeHintType, Object>(); 
   hint.put(EncodeHintType.CHARACTER_SET, "utf-8"); //内容编码
   hint.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);//错误等级
   hint.put(EncodeHintType.MARGIN, 1); //设置二维码外边框的空白区域的宽度
   // 生成二维码 
   BitMatrix matrix = mutiWriter.encode(content, BarcodeFormat.QR_CODE, 
       width, height, hint); 
  
   // 二维矩阵转为一维像素数组 
   int halfW = matrix.getWidth() / 2; 
   int halfH = matrix.getHeight() / 2; 
   int[] pixels = new int[width * height]; 
  
   for (int y = 0; y < matrix.getHeight(); y++) { 
     for (int x = 0; x < matrix.getWidth(); x++) { 
       // 读取图片 
       if (x > halfW - IMAGE_HALF_WIDTH 
           && x < halfW + IMAGE_HALF_WIDTH 
           && y > halfH - IMAGE_HALF_WIDTH 
           && y < halfH + IMAGE_HALF_WIDTH) { 
         pixels[y * width + x] = srcPixels[x - halfW 
             + IMAGE_HALF_WIDTH][y - halfH + IMAGE_HALF_WIDTH]; 
       }  
       // 在图片四周形成边框 
       else if ((x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH 
           && x < halfW - IMAGE_HALF_WIDTH + FRAME_WIDTH 
           && y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH 
           + IMAGE_HALF_WIDTH + FRAME_WIDTH) 
           || (x > halfW + IMAGE_HALF_WIDTH - FRAME_WIDTH 
               && x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH 
               && y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH 
               + IMAGE_HALF_WIDTH + FRAME_WIDTH) 
           || (x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH 
               && x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH 
               && y > halfH - IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH 
               - IMAGE_HALF_WIDTH + FRAME_WIDTH) 
           || (x > halfW - IMAGE_HALF_WIDTH - FRAME_WIDTH 
               && x < halfW + IMAGE_HALF_WIDTH + FRAME_WIDTH 
               && y > halfH + IMAGE_HALF_WIDTH - FRAME_WIDTH && y < halfH 
               + IMAGE_HALF_WIDTH + FRAME_WIDTH)) { 
         pixels[y * width + x] = 0xfffffff; 
       } else { 
         // 此处可以修改二维码的颜色，可以分别制定二维码和背景的颜色； 
         pixels[y * width + x] = matrix.get(x, y) ? 0xff000000
             : 0xfffffff; 
       } 
     } 
   } 
  
   BufferedImage image = new BufferedImage(width, height, 
       BufferedImage.TYPE_INT_RGB); 
   image.getRaster().setDataElements(0, 0, width, height, pixels); 
  
   return image; 
 } 
  
 /** 
  * 把传入的原始图像按高度和宽度进行缩放，生成符合要求的图标 
  * 
  * @param srcImageFile 
  *      源文件地址 
  * @param height 
  *      目标高度 
  * @param width 
  *      目标宽度 
  * @param hasFiller 
  *      比例不对时是否需要补白：true为补白; false为不补白; 
  * @throws IOException 
  */
 private static BufferedImage scale(String srcImageFile, int height, 
     int width, boolean hasFiller) throws IOException { 
   double ratio = 0.0; // 缩放比例 
   File file = new File(srcImageFile); 
   BufferedImage srcImage = ImageIO.read(file); 
   Image destImage = srcImage.getScaledInstance(width, height, 
       BufferedImage.SCALE_SMOOTH); 
   // 计算比例 
   if ((srcImage.getHeight() > height) || (srcImage.getWidth() > width)) { 
     if (srcImage.getHeight() > srcImage.getWidth()) { 
       ratio = (new Integer(height)).doubleValue() 
           / srcImage.getHeight(); 
     } else { 
       ratio = (new Integer(width)).doubleValue() 
           / srcImage.getWidth(); 
     } 
     AffineTransformOp op = new AffineTransformOp( 
         AffineTransform.getScaleInstance(ratio, ratio), null); 
     destImage = op.filter(srcImage, null); 
   } 
   if (hasFiller) {// 补白 
     BufferedImage image = new BufferedImage(width, height, 
         BufferedImage.TYPE_INT_RGB); 
     Graphics2D graphic = image.createGraphics(); 
     graphic.setColor(Color.PINK); 
     graphic.fillRect(10, 10, width, height); 
     graphic.drawRect(100, 360, width, height);
     if (width == destImage.getWidth(null)) { 
       graphic.drawImage(destImage, 0, 
           (height - destImage.getHeight(null)) / 2, 
           destImage.getWidth(null), destImage.getHeight(null), 
           Color.white, null); 
       Shape shape = new RoundRectangle2D.Float(0, (height - destImage.getHeight(null)) / 2, width, width, 20, 20);
       graphic.setStroke(new BasicStroke(5f));
       graphic.draw(shape);
     }
     else {
       graphic.drawImage(destImage, 
           (width - destImage.getWidth(null)) / 2, 0, 
           destImage.getWidth(null), destImage.getHeight(null), 
           Color.white, null);
       Shape shape = new RoundRectangle2D.Float((width - destImage.getWidth(null)) / 2, 0, width, width, 20, 20);
       graphic.setStroke(new BasicStroke(5f));
       graphic.draw(shape);
     }
     graphic.dispose(); 
     destImage = image; 
      
   } 
   return (BufferedImage) destImage; 
 } 
}

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