Java生成二维码，扫描后跳转到指定的网站

转自：https://suko.iteye.com/blog/2244138

本例我是应用google的二维码工具包来做的，附近提供jar包下载。下面是完整代码，经过测试的。

jar下载路径：https://mvnrepository.com/artifact/com.google.zxing/core/3.3.0

    package test;  
      
    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 java.util.Random;  
      
    import javax.imageio.ImageIO;  
      
    import com.google.zxing.BarcodeFormat;  
    import com.google.zxing.BinaryBitmap;  
    import com.google.zxing.DecodeHintType;  
    import com.google.zxing.EncodeHintType;  
    import com.google.zxing.MultiFormatReader;  
    import com.google.zxing.MultiFormatWriter;  
    import com.google.zxing.Result;  
    import com.google.zxing.common.BitMatrix;  
    import com.google.zxing.common.HybridBinarizer;  
    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<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();    
            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;    
        }    
        
        /**  
         * 插入LOGO  
         *   
         * @param source  
         *            二维码图片  
         * @param imgPath  
         *            LOGO图片地址  
         * @param needCompress  
         *            是否压缩  
         * @throws Exception  
         */    
        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();    
        }    
        
        /**  
         * 生成二维码(内嵌LOGO)  
         *   
         * @param content  
         *            内容  
         * @param imgPath  
         *            LOGO地址  
         * @param destPath  
         *            存放目录  
         * @param needCompress  
         *            是否压缩LOGO  
         * @throws Exception  
         */    
        public static void encode(String content, String imgPath, String destPath,    
                boolean needCompress) throws Exception {    
            BufferedImage image = QRCodeUtil.createImage(content, imgPath,    
                    needCompress);    
            mkdirs(destPath);    
            String file = new Random().nextInt(99999999)+".jpg";    
            ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));    
        }    
        
        /**  
         * 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)  
         * @author lanyuan  
         * Email: mmm333zzz520@163.com  
         * @date 2013-12-11 上午10:16:36  
         * @param destPath 存放目录  
         */    
        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();    
            }    
        }    
        
        /**  
         * 生成二维码(内嵌LOGO)  
         *   
         * @param content  
         *            内容  
         * @param imgPath  
         *            LOGO地址  
         * @param destPath  
         *            存储地址  
         * @throws Exception  
         */    
        public static void encode(String content, String imgPath, String destPath)    
                throws Exception {    
            QRCodeUtil.encode(content, imgPath, destPath, false);    
        }    
        
        /**  
         * 生成二维码  
         *   
         * @param content  
         *            内容  
         * @param destPath  
         *            存储地址  
         * @param needCompress  
         *            是否压缩LOGO  
         * @throws Exception  
         */    
        public static void encode(String content, String destPath,    
                boolean needCompress) throws Exception {    
            QRCodeUtil.encode(content, null, destPath, needCompress);    
        }    
        
        /**  
         * 生成二维码  
         *   
         * @param content  
         *            内容  
         * @param destPath  
         *            存储地址  
         * @throws Exception  
         */    
        public static void encode(String content, String destPath) throws Exception {    
            QRCodeUtil.encode(content, null, destPath, false);    
        }    
        
        /**  
         * 生成二维码(内嵌LOGO)  
         *   
         * @param content  
         *            内容  
         * @param imgPath  
         *            LOGO地址  
         * @param output  
         *            输出流  
         * @param needCompress  
         *            是否压缩LOGO  
         * @throws Exception  
         */    
        public static void encode(String content, String imgPath,    
                OutputStream output, boolean needCompress) throws Exception {    
            BufferedImage image = QRCodeUtil.createImage(content, imgPath,    
                    needCompress);    
            ImageIO.write(image, FORMAT_NAME, output);    
        }    
        
        /**  
         * 生成二维码  
         *   
         * @param content  
         *            内容  
         * @param output  
         *            输出流  
         * @throws Exception  
         */    
        public static void encode(String content, OutputStream output)    
                throws Exception {    
            QRCodeUtil.encode(content, null, output, false);    
        }    
        
        /**  
         * 解析二维码  
         *   
         * @param file  
         *            二维码图片  
         * @return  
         * @throws Exception  
         */    
        public static String decode(File file) throws Exception {    
            BufferedImage image;    
            image = ImageIO.read(file);    
            if (image == null) {    
                return null;    
            }    
            BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(    
                    image);    
            BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));    
            Result result;    
            Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();    
            hints.put(DecodeHintType.CHARACTER_SET, CHARSET);    
            result = new MultiFormatReader().decode(bitmap, hints);    
            String resultStr = result.getText();    
            return resultStr;    
        }    
        
        /**  
         * 解析二维码  
         *   
         * @param path  
         *            二维码图片地址  
         * @return  
         * @throws Exception  
         */    
        public static String decode(String path) throws Exception {    
            return QRCodeUtil.decode(new File(path));    
        }  
          
        public static void main(String[] args) throws Exception {  
            String text = "http://www.iteye.com";  //这里设置自定义网站url  
            String logoPath = "d:\\zilv.jpg";   
            String destPath = "d:\\";   
            QRCodeUtil.encode(text, logoPath, destPath, true);    
        }  
    }  

辅助类（ BufferedImageLuminanceSource）

转自：https://www.cnblogs.com/jtmjx/archive/2012/06/18/2545209.html

 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);
   }
 
 }