package com.bigroc.qrcode;

import com.swetake.util.Qrcode;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;

/**
 * Created by BigRoc on 2017/9/8.
 */
public class CreateQRCode {
    public static void main(String[] args) throws IOException {

        //API文档规定计算图片宽高的方式 ，7是本次测试的版本号
        int width = 67+12*(7-1);
        int height = 67+12*(7-1);


        Qrcode x = new Qrcode();
        x.setQrcodeErrorCorrect(‘M‘);//纠错等级
        x.setQrcodeEncodeMode(‘B‘);//(N：数字) (A: a~z,A~Z)(B:其他)
        x.setQrcodeVersion(7);//版本号  1-40
        String qrData = "www.bigroc.xyz";//内容信息

        byte[] d = qrData.getBytes("utf-8");//汉子转格式需要抛出异常

        //缓冲区
        BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);

        //绘图
        Graphics2D gs = bufferedImage.createGraphics();

        gs.setBackground(Color.WHITE);
        gs.setColor(Color.BLACK);
        gs.clearRect(0, 0, width, height);

        //偏移量
        int pixoff = 2;


        /**
         * 容易踩坑的地方
         * 注意for循环里面的i，j的顺序，
         * s[j][i]二维数组的j，i的顺序要与
         * 这个方法中的 gs.fillRect(j*3+pixoff,i*3+pixoff, 3, 3);
         * 顺序匹配，否则会出现解析图片是一串数字
         */
        if (d.length > 0 && d.length < 120) {
            boolean[][] s = x.calQrcode(d);

            for (int i = 0; i < s.length; i++) {
                for (int j = 0; j < s.length; j++) {
                    if (s[j][i]) {
                        gs.fillRect(j * 3 + pixoff, i * 3 + pixoff, 3, 3);
                    }
                }
            }
        }
        gs.dispose();
        bufferedImage.flush();

        ImageIO.write(bufferedImage,"png",new File("D:/qrcode.png"));
        System.out.println("二维码生成完毕");
    }
}

package com.bigroc.qrcode;

import jp.sourceforge.qrcode.QRCodeDecoder;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

/**
 * Created by BigRoc on 2017/9/8.
 */
public class ReadQRCode {
    public static void main(String[] args) throws IOException {
        //图片路径
        File file = new File("D:/qrcode.png");
        //读取图片到缓冲区
        BufferedImage bufferedImage = ImageIO.read(file);
        //QRCode解码器
        QRCodeDecoder codeDecoder = new QRCodeDecoder();
        /**
         *codeDecoder.decode(new MyQRCodeImage())
         *这里需要实现QRCodeImage接口，移步最后一段代码
         */
        //通过解析二维码获得信息
        String result = new String(codeDecoder.decode(new MyQRCodeImage(bufferedImage)), "utf-8");
        System.out.println(result);
    }
}

package com.bigroc.qrcode;

import jp.sourceforge.qrcode.data.QRCodeImage;

import java.awt.image.BufferedImage;

/**
 * 实现QRCodeImage接口，
 * 设置解码的图片信息
 * 告诉codeDecoder.decode()将要解析的图片类型
 * Created by BigRoc on 2017/9/9.
 */
public class MyQRCodeImage implements QRCodeImage{


    BufferedImage bufferedImage;

    public MyQRCodeImage(BufferedImage bufferedImage){
        this.bufferedImage=bufferedImage;
    }

    //宽
    @Override
    public int getWidth() {
        return bufferedImage.getWidth();
    }

    //高
    @Override
    public int getHeight() {
        return bufferedImage.getHeight();
    }

    //像素还是颜色
    @Override
    public int getPixel(int i, int j) {
        return bufferedImage.getRGB(i,j);
    }
}