二维码生产与解析

 

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.IOException;
import java.util.Hashtable;

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.LuminanceSource;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.Result;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

public class QRCodeUtils {
    private static final String CODE = "utf-8";
    private static final String IMAGE_TYPE = "png";
    private static final int BLACK = 0xFF000000;
    private static final int WHITE = 0xFFFFFFFF;
    private static final int LOGO_SIZE = 60;  

     /** 
     * 生成RQ二维码    默认生成二维码
     *  
     * @author wfhe 
     * @param content 
     *            内容 
     * @param height 
     *            高度（px） 
     * @param width 
     *            高度（px）
     *  
     */  
    public static BufferedImage getRQ(String content, Integer height, Integer width, 
             String logoPath, boolean needCompress) {
        if(height == null || height < 100) {
            height = 200;
        }
        if(width == null || width < 50) {
            width = height;
        }

        try {
            Hashtable<EncodeHintType, Object> h = new Hashtable<EncodeHintType, Object>();
            h.put(EncodeHintType.CHARACTER_SET, CODE);
            h.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
            h.put(EncodeHintType.MARGIN, 1);

            BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, h);

            return toBufferedImage(bitMatrix, logoPath, needCompress);

        } catch (WriterException e) {
            e.printStackTrace();
        }

        return null;
    }

     /** 
     * 转换成图片 
     *  
     * @author wfhe 
     * @param bitMatrix 
     * @param logoPath logo文件路径
     * @param needCompress logo是否要压缩 
     * @return 
     */  
    private static BufferedImage toBufferedImage(BitMatrix bitMatrix, String logoPath, boolean needCompress ){
        int width = bitMatrix.getWidth();
        int height = bitMatrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB); 
        for(int x = 0; x < width; x++) {
            for(int y = 0; y < height; y ++) {
                image.setRGB(x, y, bitMatrix.get(x, y)? BLACK : WHITE);
            }
        }

        if(logoPath != null && !"".equals(logoPath)) wlogo(image, logoPath, needCompress);
        return image;
    }

    /**
     *  生成一、二维码，写到文件中
     *  
     * @author wfhe
     * @param content 内容
     * @param height 高度
     * @param width 宽度
     * @param filePath 文件路径
     * @throws Exception 
     */
    public static void wQRFile(String content, Integer height, Integer width, String filePath,
             String logoPath, boolean needCompress
            ) throws Exception {
        if(filePath == null || "".equals(filePath)) throw new Exception("filePath erorr : " + filePath);
        File file = new File(filePath);
        if(file == null || file.exists() == false) {
            try {
                file.createNewFile();
            } catch (Exception e) {
                throw new Exception("filePath create fail : " + filePath);
            }
        }


        BufferedImage image  = getRQ(content, height, width, logoPath, needCompress);
        ImageIO.write(image, IMAGE_TYPE, file);
    }

    /**
     * @author wfhe
     * @param filePath 需要解析的二维码图片路径
     * @return
     */
    public static String resolve(String filePath) {
        try {
            if(filePath == null || "".equals(filePath)) throw new Exception("filePath erorr : " + filePath);
            File file = new File(filePath);
            if(file == null || file.exists() == false) throw new Exception("File Not Found : " + filePath);

            BufferedImage imge = ImageIO.read(file);

            LuminanceSource source = new BufferedImageLuminanceSource(imge);
            BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

            // 解码设置编码方式为：utf-8
            Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();  
            hints.put(DecodeHintType.CHARACTER_SET, CODE);  

            Result result = new MultiFormatReader().decode(bitmap, hints);

            return result.getText();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * @author wfhe
     * @param bufferedImage 图片缓存
     * @param logoPath logo 图片文件的路径
     * @param needCompress 是否要压缩logo
     */
    private static void wlogo(BufferedImage bufferedImage, String logoPath, boolean needCompress) { 
        try {
            File file = new File(logoPath);  
            if (!file.exists()) {  
                    throw new Exception("File Not Found : " + logoPath);
            }
            Image logo = ImageIO.read(file);
            int width = logo.getWidth(null);
            int height = logo.getHeight(null);
            if(needCompress){// 压缩LOGO
                width = LOGO_SIZE;
                height = LOGO_SIZE;

                logo = logo.getScaledInstance(width, height, Image.SCALE_SMOOTH);
                BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);  
                Graphics g = tag.getGraphics();  
                g.drawImage(logo, 0, 0, null); // 绘制缩小后的图  
                g.dispose();  
            }
            // 插入LOGO  
            Graphics2D grap = bufferedImage.createGraphics();
            int x = (bufferedImage.getWidth() - width) >> 1;
            int y = (bufferedImage.getHeight() - height) >> 1;
            grap.drawImage(logo, x, y, width, height, null);
            Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
            grap.setStroke(new BasicStroke(3f));
            grap.draw(shape);
            grap.dispose();

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) throws Exception {
        String filePath = "d://1.png";
        String logoPath = "d://111.jpg";

        QRCodeUtils.wQRFile("http://www.baidu.com", null, null, filePath, logoPath, true);

        System.out.println("-----成生成功----");

        String s = QRCodeUtils.resolve(filePath);

        System.out.println("-----解析成功----");
        System.out.println(s);

    }

}