java二维码生成代码

 QRCodeUtil.encode(text, "D:/004.jpg", "D:", true, "exp");// 这个方法的第一个参数是网址，第二个参数是内嵌图片，第三个参数：是否压缩logo,第四个参数：二维码名字；
需要core-2.3.0.jar包，然后直接复制粘贴即可用。

  1 package otherTest;

 import java.awt.BasicStroke;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.Image;
 import java.awt.Shape;
 import java.awt.geom.RoundRectangle2D;
 import java.awt.image.BufferedImage;
 import java.io.File;
 import java.io.OutputStream;
 import java.util.Hashtable;

 import javax.imageio.ImageIO;

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

 public class QRCodeUtil {
     private static final String CHARSET = "utf-8";
     private static final String FORMAT_NAME = "JPG";
     // 二维码尺寸
     private static final int QRCODE_SIZE = 300;
     // LOGO宽度
     private static final int WIDTH = 60;
     // LOGO高度
     private static final int HEIGHT = 60;

     private static BufferedImage createImage(String content, String imgPath, boolean needCompress) throws Exception {
         Hashtable hints = new Hashtable();
         hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
         hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
         hints.put(EncodeHintType.MARGIN, 1);
         BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE,
                 hints);
         int width = bitMatrix.getWidth();
         int height = bitMatrix.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, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
             }
         }
         if (imgPath == null || "".equals(imgPath)) {
             return image;
         }

         // 插入图片
         QRCodeUtil.insertImage(image, imgPath, needCompress);
         return image;
     }

     private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws Exception {
         File file = new File(imgPath);
         if (!file.exists()) {
             System.err.println("" + imgPath + "   该文件不存在！");
             return;
         }
         Image src = ImageIO.read(new File(imgPath));
         int width = src.getWidth(null);
         int height = src.getHeight(null);
         if (needCompress) { // 压缩LOGO
             if (width > WIDTH) {
                 width = WIDTH;
             }
             if (height > HEIGHT) {
                 height = HEIGHT;
             }
             Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
             BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
             Graphics g = tag.getGraphics();
             g.drawImage(image, 0, 0, null); // 绘制缩小后的图
             g.dispose();
             src = image;
         }
         // 插入LOGO
         Graphics2D graph = source.createGraphics();
         int x = (QRCODE_SIZE - width) / 2;
         int y = (QRCODE_SIZE - height) / 2;
         graph.drawImage(src, x, y, width, height, null);
         Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
         graph.setStroke(new BasicStroke(3f));
         graph.draw(shape);
         graph.dispose();
     }

     public static void encode(String content, String imgPath, String destPath, boolean needCompress, String fileName)
             throws Exception {
         BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
         mkdirs(destPath);
         String file = fileName + "." + FORMAT_NAME.toLowerCase();
         ImageIO.write(image, FORMAT_NAME, new File(destPath + File.separator + file));
     }

     public static void mkdirs(String destPath) {
         File file = new File(destPath);
         // 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
         if (!file.exists() && !file.isDirectory()) {
             file.mkdirs();
         }
     }
     public static void main(String[] args) throws Exception {
         String text = "http://www.baidu.com";
         QRCodeUtil.encode(text, "D:/004.jpg", "D:", true, "exp");
     }
 }