java二维码的生成和解码，java,二维码似乎很火，了解了一

java二维码的生成和解码，java,二维码似乎很火，了解了一

二维码似乎很火，了解了一下，并找java资料做了一个自己的名片放到了blog上。

涉及到的一些主要类库，方便大家下载：

二维码编码lib:Qrcode_swetake.jar（官网介绍 -- http://www.swetake.com/qr/index-e.html）
二维码解码lib:qrcode.jar （官网介绍 -- http://sourceforge.jp/projects/qrcode/）

java二维码 生成二维码 QRCodeEncoderHandler.java

package cn.outofmemory.java;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://zhblog.github.com/blog * @author zzh */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("utf-8");            BufferedImage bufImg = new BufferedImage(140, 140,                    BufferedImage.TYPE_INT_RGB);            Graphics2D gs = bufImg.createGraphics();            gs.setBackground(Color.cyan);            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 = "./zzh.png";        String content = "\t江湖在喝酒的路上"                + "\nMyblog  :http://zhblog.github.com/blog"                + "\nEMail   :jack.zh.1986@gmail.com"                + "\nQQ      :715443050";        QRCodeEncoderHandler handler = new QRCodeEncoderHandler();        handler.encoderQRCode(content, imgPath);        System.out.println("encoder QRcode success");    }}

java二维码解码 QRCodeDecoderHandler.java

package cn.outofmemory.java;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://zhblog.github.com/blog * @author zzh */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)));        } 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 = "zzh.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);        }    }}