Java实现二维码QRCode的编码和解码

    转载自 http://www.2cto.com/kf/201108/98471.html

 

  

package michael.qrcode; 

 

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; 

 

/**

 * 二维码生成器

 * @blog http://sjsky.iteye.com

 * @author Michael

 */ 

public class QRCodeEncoderHandler { 

 

    /**

     * 生成二维码(QRCode)图片

     * @param content

     * @param imgPath

     */ 

    public void encoderQRCode(String content, String imgPath) { 

        try { 

 

            Qrcode qrcodeHandler = new Qrcode(); 

            qrcodeHandler.setQrcodeErrorCorrect('M'); 

            qrcodeHandler.setQrcodeEncodeMode('B'); 

            qrcodeHandler.setQrcodeVersion(7); 

 

            System.out.println(content); 

            byte[] contentBytes = content.getBytes("gb2312"); 

 

            BufferedImage bufImg = new BufferedImage(140, 140, 

                    BufferedImage.TYPE_INT_RGB); 

 

            Graphics2D gs = bufImg.createGraphics(); 

 

            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 { 

                System.err.println("QRCode content bytes length = " 

                        + contentBytes.length + " not in [ 0,120 ]. "); 

            } 

 

            gs.dispose(); 

            bufImg.flush(); 

 

            File imgFile = new File(imgPath); 

 

            // 生成二维码QRCode图片 

            ImageIO.write(bufImg, "png", imgFile); 

 

        } catch (Exception e) { 

            e.printStackTrace(); 

        } 

 

    } 

 

    /**

     * @param args the command line arguments

     */ 

    public static void main(String[] args) { 

        String imgPath = "D:/test/twocode/Michael_QRCode.png"; 

 

        String content = "Hello 大大、小小,welcome to QRCode!" 

                + "\nMyblog [ http://sjsky.iteye.com ]" 

                + "\nEMail [ [e-mail] ]" + "\nTwitter [ @suncto ]"; 

 

        QRCodeEncoderHandler handler = new QRCodeEncoderHandler(); 

        handler.encoderQRCode(content, imgPath); 

 

        System.out.println("encoder QRcode success"); 

    } 

} 

 

 运行后生成的二维码图片如下：

 

          

 

此时就可用手机的二维码扫描软件（本人用的：android 快拍二维码 ）来测试下，识别成功的截图如下：

 

 

喜欢的朋友可以下载后试一试，做一些名片或者自己喜欢的东西。当然Java也可以对二维码图片解码，具体看下面关于解码的内容。

 

 

【二】、解码：

 

package michael.qrcode; 

 

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; 

 

/**

 * @blog http://sjsky.iteye.com

 * @author Michael

 */ 

public class QRCodeDecoderHandler { 

 

    /**

     * 解码二维码

     * @param imgPath

     * @return String

     */ 

    public String decoderQRCode(String imgPath) { 

 

        // QRCode 二维码图片的文件 

        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))); 

 

            // try { 

            // System.out.println(new String(decodedData.getBytes("gb2312"), 

            // "gb2312")); 

            // } catch (Exception e) { 

            // // TODO: handle exception 

            // } 

        } 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 = "d:/test/twocode/Michael_QRCode.png"; 

        String decoderContent = handler.decoderQRCode(imgPath); 

        System.out.println("解析结果如下："); 

        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); 

        } 

 

    } 

} 

 

 

运行结果如下（解码出的内容和之前输入的内容一致 ）：

解析结果如下：

Hello 大大、小小,welcome to QRCode!

Myblog [ http://sjsky.iteye.com ]

EMail [ [e-mail] ]

Twitter [ @suncto ]

========decoder success!!!