二维码

通过Qrcode生成二维码：

需导入Qrcode.jar包

生成二维码：
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;

import com.swetake.util.Qrcode;

public class QRCodeEncoderHandler {
public void encoderQRCode(String content, String imgPath) throws Exception {
        // 处理异常
        try {
            // 实例化对象
            Qrcode qrcodeHandler = new Qrcode();
            // 设置
            qrcodeHandler.setQrcodeErrorCorrect('M');
            qrcodeHandler.setQrcodeEncodeMode('B');
            qrcodeHandler.setQrcodeVersion(7);
           
            // 二维码内容转换
            byte[] contentBytes = content.getBytes("gb2312");
           
            // 实例化对象
            BufferedImage bufImg = new BufferedImage(140, 140, BufferedImage.TYPE_INT_RGB);
           
            // 创建
            Graphics2D gs = bufImg.createGraphics();
            // 设置
            gs.setBackground(Color.WHITE);
           
            gs.clearRect(0, 0, 140, 140);

            // 设定图像颜色> BLACK
            gs.setColor(Color.BLACK);

            // 设置偏移量 不设置可能导致解析出错
            int pixoff = 2;
            // 输出内容> 二维码
            if (contentBytes.length > 0 && contentBytes.length < 120) {
                boolean[][] codeOut = qrcodeHandler.calQrcode(contentBytes);
                for (int i = 0; i < codeOut.length; i++) {
                    for (int j = 0; j < codeOut.length; j++) {
                        if (codeOut[j][i]) {
                            gs.fillRect(j * 3 + pixoff, i * 3 + pixoff, 3, 3);
                        }
                    }
                }
            } else {
                throw new Exception("QRCode content bytes length = " + contentBytes.length + " not in [ 0,120 ]. ");
            }
            gs.dispose();
            bufImg.flush();
           
            // 二维码文件对象
            File imgFile = new File(imgPath);
           
            // 判断是否存在
            if(!imgFile.exists()){
                // 不存在，先进行创建
                imgFile.mkdirs();
            }
            // 生成二维码QRCode图片
            ImageIO.write(bufImg, "png", imgFile);
        } catch (Exception e) {
            throw new Exception("Error：" + e.getMessage());
        }
    }

}





解析二维码：

import java.awt.image.BufferedImage;
import java.io.File;

import javax.imageio.ImageIO;

import jp.sourceforge.qrcode.QRCodeDecoder;
import jp.sourceforge.qrcode.data.QRCodeImage;


public class QRCodeDecoderHandle {
public String decoderQRCode(String imgPath) throws Exception {
        // QRCode 二维码图片的文件
        File imageFile = new File(imgPath);
        // 声明对象
        BufferedImage bufImg = null;
        // 声明变量
        String decodedData = null;
        // 处理异常
        try {
            // 获取对象
            bufImg = ImageIO.read(imageFile);
            // 实例化对象
            QRCodeDecoder decoder = new QRCodeDecoder();
            // 解码
            decodedData = new String(decoder.decode(new J2SEImage(bufImg)));
        } catch (Exception e) {
            // 抛出异常
            throw new Exception("Error: " + e.getMessage());
        }
        // 返回
        return decodedData;
    }
   
    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);
        }
    }
}


public class DemoTest {
public static void main(String[] args) throws Exception {

String imgPath = "D:/test/twocode/Wang_QRCode.png"; 
 
        String content ="\nMyHome [ http://user.qzone.qq.com/417282638/infocenter ]"
                + "\nEMail [ [email protected] ]"; 
 
        QRCodeEncoderHandler handler = new QRCodeEncoderHandler(); 
//        handler.encoderQRCode(content, imgPath); 
 
        System.out.println("encoder QRcode success"); 

QRCodeDecoderHandle handle = new QRCodeDecoderHandle(); 
        String imgPaths = "d:/test/twocode/Wang_QRCode.png"; 
        String decoderContent = handle.decoderQRCode(imgPaths);
        System.out.println("解析结果如下："); 
        System.out.println(decoderContent); 
        System.out.println("========decoder success!!!"); 

}

}