자 바 는 QR 코드 를 어떻게 해석 합 니까?

package com.ust.map;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;
import javax.imageio.ImageIO;
import jp.sourceforge.qrcode.QRCodeDecoder;import jp.sourceforge.qrcode.data.QRCodeImage;import jp.sourceforge.qrcode.exception.DecodingFailedException;
public class QRCodeDecoderHandler {

/**
 *      
 * @param imgPath
 * @return String
 */
public String decoderQRCode(String imgPath) {

    // QRCode         
    File imageFile = new File(imgPath);

    BufferedImage bufImg = null;
    String decodedData = null;
    try {
        bufImg = ImageIO.read(imageFile);

        QRCodeDecoder decoder = new QRCodeDecoder();
        decodedData = new String(decoder.decode(new J2SEImage(bufImg)));
    } catch (IOException e) {
        System.out.println("Error: " + e.getMessage());
        e.printStackTrace();
    } catch (DecodingFailedException dfe) {
        System.out.println("Error: " + dfe.getMessage());
        dfe.printStackTrace();
    }
    return decodedData;
}

/**
 * @param args the command line arguments
 */
public static void main(String[] args) {
    QRCodeDecoderHandler handler = new QRCodeDecoderHandler();
    String imgPath = "E://IDO//   //yizhicheng.png";
    String decoderContent = handler.decoderQRCode(imgPath);
    System.out.println("      ：");
    System.out.println(decoderContent);
    System.out.println("========decoder success!!!");
}

class J2SEImage implements QRCodeImage {
    BufferedImage bufImg;

    public J2SEImage(BufferedImage bufImg) {
        this.bufImg = bufImg;
    }

    public int getWidth() {
        return bufImg.getWidth();
    }

    public int getHeight() {
        return bufImg.getHeight();
    }

    public int getPixel(int x, int y) {
        return bufImg.getRGB(x, y);
    }

}

}