利用QRCode生成二维码

在群聊天里面看到有人要QRCode.jar，在网上一查才知道是生成和解析二维码的包。在网上找了一下用法，很好用。在此贴出来。

QRCode.jar 免积分下载地址：http://download.csdn.net/detail/levelmini/7470979 

import java.awt.Color;import java.awt.Graphics2D;import java.awt.Image;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;import com.swetake.util.Qrcode;/** *  * 二维码生成器 *  * @blog http://sjsky.iteye.com *  * @author Michael */public class TestQRCode {//设置二维码中间图片的宽高private int imageWidth = 30;private int imageHeight = 30;/** * 生成二维码(QRCode)图片 * @param content 二维码索表示的内容。 * @param imgPath 二维码图片存放路径。 * @param centerImgPath 二维码中央的logo。可以为空字符串或null */public void encoderQRCode(String content, String imgPath ,String centerImgPath) {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> BLACKgs.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 ]. ");}if (!("".equals(centerImgPath) || null == centerImgPath)) {createPhotoAtCenter(bufImg,centerImgPath);}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();}}/**     * 解码二维码，如果中间带有logo则解析可能出乱码。     * @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;     }         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);         }     }         /**     * 在二维码中间加入图片     *      * @param bugImg     * @return     */    private BufferedImage createPhotoAtCenter(BufferedImage bufImg ,String centerImgPath) throws Exception {     Image im = ImageIO.read(new File(centerImgPath));         Graphics2D g = bufImg.createGraphics();         //获取bufImg的中间位置         int centerX = bufImg.getMinX() + bufImg.getWidth()/2 - imageWidth/2;         int centerY = bufImg.getMinY() + bufImg.getHeight()/2 - imageHeight/2;         g.drawImage(im,centerX,centerY,imageWidth,imageHeight,null);         g.dispose();         bufImg.flush();    return bufImg;    }public static void main(String[] args) {//生成二维码String imgPath = "D:/QRcode.png";String content = "http://blog.csdn.net/levelmini";TestQRCode handler = new TestQRCode();handler.encoderQRCode(content, imgPath,"d:/levelmini.png");System.out.println("encoder QRcode success");//解析二维码文件        String imgPath1 = "D:/QRcode.png";         String decoderContent = handler.decoderQRCode(imgPath1);         System.out.println("解析结果如下：");         System.out.println(decoderContent);         System.out.println("========decoder success!!!");}}

效果：