package com.wk.qrcode;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

import javax.imageio.ImageIO;

import jp.sourceforge.qrcode.QRCodeDecoder;

public class ReadQRCode {

public static void main(String[] args) throws IOException {

File file = new File("D://img.png");

BufferedImage bufferedImage = ImageIO.read(file);

QRCodeDecoder codeDecoder = new QRCodeDecoder();

String result = new String(codeDecoder.decode(new MyQRCodeImage(bufferedImage)));

System.out.println(result);

}

}

package com.wk.qrcode;

import java.awt.image.BufferedImage;

import jp.sourceforge.qrcode.data.QRCodeImage;

public class MyQRCodeImage implements QRCodeImage {

BufferedImage bufferedImage;

public MyQRCodeImage(BufferedImage bufferedImage) {

this.bufferedImage = bufferedImage;

}

@Override

public int getHeight() {

return bufferedImage.getHeight();

}

@Override

public int getPixel(int arg0, int arg1) {

return bufferedImage.getRGB(arg0, arg1);

}

@Override

public int getWidth() {

return bufferedImage.getWidth();

}

}

结果打印出来是：

19628671028299113646982254461625629964540660043172309990720326327708969541999728475429321813549061834182907580805898539388735496775103106854592411992889663010198072995495752784186816116372008403787635790855390000000000000000000000000000000000000000000000000000000000000000000000