生成二维码

package com.test.main;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;

import javax.imageio.ImageIO;

import com.swetake.util.Qrcode;

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

        String content = "http://www.baidu.com";//生成二维码内容

        Qrcode qrcode = new Qrcode();
        qrcode.setQrcodeErrorCorrect('M');//纠错率L(7%)、M(15%)、Q(25%)、H(30%)，char类型
        qrcode.setQrcodeEncodeMode('B');//A:a~Z;B:其他字符，包括中文
        qrcode.setQrcodeVersion(7);//QRcode版本:1~40
        //固定公式  二维码的宽和高
        int width = 67+12*(qrcode.getQrcodeVersion()-1);
        int height = 67+12*(qrcode.getQrcodeVersion()-1);

        try {
            //读取图片缓冲区的Image
            BufferedImage bufferedImage = new BufferedImage(width, height, 
                    BufferedImage.TYPE_INT_RGB);
            //Graphics2D绘图
            Graphics2D gs = bufferedImage.createGraphics();
            gs.setColor(Color.BLACK);
            gs.setBackground(Color.WHITE);
            gs.clearRect(0, 0, width, height);//清除画板内容
            int pixoff = 2;//偏移量
            //输出二维码
            byte[] bs = content.getBytes("utf-8");//编码方式
            if (bs.length>0 && bs.length<120) {
                boolean[][] contentOut = qrcode.calQrcode(bs);
                for(int i=0;i<contentOut.length;i++){
                    for(int j=0;j<contentOut.length;j++){
                        if(contentOut[i][j]){
                            //二维码图片填充
                            gs.fillRect(i*3+pixoff,j*3+pixoff,3,3);
                            //如果i在外层循环，j在内层循环（个人习惯），应该gs.fillRect(i*3+pixoff,j*3+pixoff, 3, 3);
                            //而不是gs.fillRect(j*3+pixoff,i*3+pixoff, 3, 3);否则解析为一串数字
                        }
                    }
                }
            }
            //释放资源
            gs.dispose();
            bufferedImage.flush();

            //存储二维码
            File file = new File("F:/MyLife/二维码.png");//二维码存储路径
            //判断文件是否已存在
            if (!file.exists()) {
                OutputStream outputStream = new FileOutputStream(file);
                outputStream.flush();
                outputStream.close();
            }

            //生成二维码图片
            ImageIO.write(bufferedImage, "png", file);

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

    }
}

解析二维码

package com.test.main;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import jp.sourceforge.qrcode.QRCodeDecoder;

public class ReadQRCodeDemo {
    public static void main(String[] args) throws IOException {
        //二维码存储地址
        File file = new File("F:/MyLife/二维码.png");
        //识别成图片
        BufferedImage bufferedImage = ImageIO.read(file);
        QRCodeDecoder codeDecoder = new QRCodeDecoder();
        //ReadQRCodeDemo2--QRCodeImage
        String result = new String(codeDecoder.decode(new ReadQRCodeDemo2(bufferedImage)),"gb2312");
        System.out.println("解析二维码结果:"+result);
    }
}

实现类

package com.test.main;

import java.awt.image.BufferedImage;

import jp.sourceforge.qrcode.data.QRCodeImage;

public class ReadQRCodeDemo2 implements QRCodeImage {
    BufferedImage bufferedImage;

    public ReadQRCodeDemo2(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();
    }

}

简单的二维码生成和解析，与君共勉