Java generates a QR code, scans it and jumps to the specified website

In this example, I used Google's QR code toolkit to do it, and the jar package is available for download nearby. Below is the complete code, tested.

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";  
    // QR code size  
    private static final int QRCODE_SIZE = 300;
    // Logo width  
    private static final int WIDTH = 60;
    // Logo height  
    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;  
        }  
        // insert image  
        QRCodeUtil.insertImage(image, imgPath, needCompress);  
        return image;  
    }  
  
    /**
     * Insert LOGO
     *  
     * @param source
     * QR code picture
     * @param imgPath
     * LOGO picture address
     * @param needCompress
     * Whether to compress
     * @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+" The file does not exist!");  
            return;  
        }  
        Image src = ImageIO.read(new File(imgPath));  
        int width = src.getWidth(null);  
        int height = src.getHeight(null);  
        if (needCompress) { // Compress the 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); // draw the reduced image  
            g.dispose();  
            src = image;  
        }  
        // insert 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();  
    }  
  
    /**
     * Generate QR code (embedded LOGO)
     *  
     * @param content
     * content
     * @param imgPath
     * Logo address
     * @param destPath
     * storage directory
     * @param needCompress
     * Whether to compress 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));  
    }  
  
    /**
     * When the folder does not exist, mkdirs will automatically create multiple directories, which is different from mkdir. (mkdir will throw an exception if the parent directory does not exist)
     * @author lanyuan
     * Email: [email protected]
     * @date 2013-12-11 10:16:36 AM
     * @param destPath storage directory
     */  
    public static void mkdirs(String destPath) {  
        File file =new File(destPath);      
        //When the folder does not exist, mkdirs will automatically create a multi-layer directory, which is different from mkdir. (mkdir will throw an exception if the parent directory does not exist)  
        if (!file.exists() && !file.isDirectory()) {  
            file.mkdirs();  
        }  
    }  
  
    /**
     * Generate QR code (embedded LOGO)
     *  
     * @param content
     * content
     * @param imgPath
     * Logo address
     * @param destPath
     * storage address
     * @throws Exception
     */  
    public static void encode(String content, String imgPath, String destPath)  
            throws Exception {  
        QRCodeUtil.encode(content, imgPath, destPath, false);  
    }  
  
    /**
     * Generate QR code
     *  
     * @param content
     * content
     * @param destPath
     * storage address
     * @param needCompress
     * Whether to compress LOGO
     * @throws Exception
     */  
    public static void encode(String content, String destPath,  
            boolean needCompress) throws Exception {  
        QRCodeUtil.encode(content, null, destPath, needCompress);  
    }  
  
    /**
     * Generate QR code
     *  
     * @param content
     * content
     * @param destPath
     * storage address
     * @throws Exception
     */  
    public static void encode(String content, String destPath) throws Exception {  
        QRCodeUtil.encode(content, null, destPath, false);  
    }  
  
    /**
     * Generate QR code (embedded LOGO)
     *  
     * @param content
     * content
     * @param imgPath
     * Logo address
     * @param output
     * output stream
     * @param needCompress
     * Whether to compress 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);  
    }  
  
    /**
     * Generate QR code
     *  
     * @param content
     * content
     * @param output
     * output stream
     * @throws Exception
     */  
    public static void encode(String content, OutputStream output)  
            throws Exception {  
        QRCodeUtil.encode(content, null, output, false);  
    }  
  
    /**
     * Parse QR code
     *  
     * @param file
     * QR code picture
     * @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;  
    }  
  
    /**
     * Parse QR code
     *  
     * @param path
     * QR code picture address
     * @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"; //Set custom website url here
        String logoPath = "d:\\zilv.jpg";
        String destPath = "d:\\";
        QRCodeUtil.encode(text, logoPath, destPath, true);  
    }
}