上一篇博客中介绍了条码的使用示例，这一篇继续介绍如何使用JAVA生成二维码。

package com.hq.util;import java.awt.Graphics2D;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.io.OutputStream;import javax.imageio.ImageIO;import com.google.zxing.BarcodeFormat;import com.google.zxing.MultiFormatWriter;import com.google.zxing.WriterException;import com.google.zxing.common.BitMatrix;/** * 二维码创建，需添加jar包：zxing-core.jar *  * @author jianggujin *  */public class QRCreater{
        /**    * 生成二维码文件    *     * @param content    *           二维码内容    * @param size    *           二维码大小    * @param file    *           生成文件    * @throws IOException    * @throws WriterException    */   public void write(String content, int size, File file) throws IOException,         WriterException   {      ImageIO.write(            toBufferedImage(new MultiFormatWriter().encode(content,                  BarcodeFormat.QR_CODE, size, size), null, 0), "JPEG", file);   }   /**    * 生成二维码并写入指定输出流    *     * @param content    *           二维码内容    * @param size    *           二维码大小    * @param os    *           输出流    * @throws IOException    * @throws WriterException    */   public void write(String content, int size, OutputStream os)         throws IOException, WriterException   {      ImageIO.write(            toBufferedImage(new MultiFormatWriter().encode(content,                  BarcodeFormat.QR_CODE, size, size), null, 0), "JPEG", os);   }   /**    * 生成带图标的二维码文件    *     * @param content    *           二维码内容    * @param size    *           二维码大小    * @param icon    *           图标文件    * @param iconSize    *           图标大小    * @param file    *           生成文件    * @throws IOException    * @throws WriterException    */   public void write(String content, int size, File icon, int iconSize,         File file) throws IOException, WriterException   {      ImageIO.write(            toBufferedImage(new MultiFormatWriter().encode(content,                  BarcodeFormat.QR_CODE, size, size), icon, iconSize), "JPEG",            file);   }   /**    * 生成带图标的二维码并写入指定输出流    *     * @param content    *           二维码内容    * @param size    *           二维码大小    * @param icon    *           图标文件    * @param iconSize    *           图标大小    * @param os    *           输出流    * @throws IOException    * @throws WriterException    */   public void write(String content, int size, File icon, int iconSize,         OutputStream os) throws IOException, WriterException   {      ImageIO.write(            toBufferedImage(new MultiFormatWriter().encode(content,                  BarcodeFormat.QR_CODE, size, size), icon, iconSize), "JPEG",            os);   }   /**    * 创建二维码的BufferedImage图像    *     * @param content    *           二维码内容    * @param size    *           二维码大小    * @return image    * @throws IOException    * @throws WriterException    */   public BufferedImage toBufferedImage(String content, int size)         throws IOException, WriterException   {      return toBufferedImage(new MultiFormatWriter().encode(content,            BarcodeFormat.QR_CODE, size, size), null, 0);   }   /**    * 创建带图标的二维码的BufferedImage图像    *     * @param content    *           二维码内容    * @param size    *           二维码大小    * @param icon    *           图标文件    * @param iconSize    *           图标大小    * @return image    * @throws IOException    * @throws WriterException    */   public BufferedImage toBufferedImage(String content, int size, File icon,         int iconSize) throws IOException, WriterException   {      return toBufferedImage(new MultiFormatWriter().encode(content,            BarcodeFormat.QR_CODE, size, size), icon, iconSize);   }   /**    * 创建二维码的BufferedImage图像    *     * @param matrix    * @param icon    *           图标文件    * @param iconSize    *           图标尺寸    * @return image    * @throws IOException    */   public BufferedImage toBufferedImage(BitMatrix matrix, File icon,         int iconSize) throws IOException   {      int color = 0xFF000000;      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) ? color : 0xFFFFFFFF);         }      }      Graphics2D graphics = image.createGraphics();      if (icon != null && icon.exists())      {         BufferedImage bufferedImage = ImageIO.read(icon);         if (iconSize <= 0)         {            iconSize = 50;         }         graphics.drawImage(bufferedImage, (image.getWidth() - iconSize) / 2,               (image.getHeight() - iconSize) / 2, iconSize, iconSize, null);      }      graphics.dispose();      image.flush();      return image;   }}