Java利用QRCode.jar包实现二维码编码与解码

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1.二维码图片类实现

package com.zhaochao.code;import java.awt.image.BufferedImage;import jp.sourceforge.qrcode.data.QRCodeImage;public class TwoDimensionCodeImage implements QRCodeImage {BufferedImage bufImg;public TwoDimensionCodeImage(BufferedImage bufImg) {this.bufImg = bufImg;}@Overridepublic int getHeight() {return bufImg.getHeight();}@Overridepublic int getPixel(int x, int y) {return bufImg.getRGB(x, y);}@Overridepublic int getWidth() {return bufImg.getWidth();}}

2.二维码编解码类实现

package com.zhaochao.code;import java.awt.Color;import java.awt.Graphics2D;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import javax.imageio.ImageIO;import jp.sourceforge.qrcode.QRCodeDecoder;import jp.sourceforge.qrcode.exception.DecodingFailedException;import com.swetake.util.Qrcode;public class TwoDimensionCode {/** * 生成二维码(QRCode)图片 * @param content 存储内容 * @param imgPath 图片路径 */public void encoderQRCode(String content, String imgPath) {this.encoderQRCode(content, imgPath, "png", 7);}/** * 生成二维码(QRCode)图片 * @param content 存储内容 * @param output 输出流 */public void encoderQRCode(String content, OutputStream output) {this.encoderQRCode(content, output, "png", 7);}/** * 生成二维码(QRCode)图片 * @param content 存储内容 * @param imgPath 图片路径 * @param imgType 图片类型 */public void encoderQRCode(String content, String imgPath, String imgType) {this.encoderQRCode(content, imgPath, imgType, 7);}/** * 生成二维码(QRCode)图片 * @param content 存储内容 * @param output 输出流 * @param imgType 图片类型 */public void encoderQRCode(String content, OutputStream output, String imgType) {this.encoderQRCode(content, output, imgType, 10);}/** * 生成二维码(QRCode)图片 * @param content 存储内容 * @param imgPath 图片路径 * @param imgType 图片类型 * @param size 二维码尺寸 */public void encoderQRCode(String content, String imgPath, String imgType, int size) {try {BufferedImage bufImg = this.qRCodeCommon(content, imgType, size);File imgFile = new File(imgPath);// 生成二维码QRCode图片ImageIO.write(bufImg, imgType, imgFile);} catch (Exception e) {e.printStackTrace();}}/** * 生成二维码(QRCode)图片 * @param content 存储内容 * @param output 输出流 * @param imgType 图片类型 * @param size 二维码尺寸 */public void encoderQRCode(String content, OutputStream output, String imgType, int size) {try {BufferedImage bufImg = this.qRCodeCommon(content, imgType, size);// 生成二维码QRCode图片ImageIO.write(bufImg, imgType, output);} catch (Exception e) {e.printStackTrace();}}/** * 生成二维码(QRCode)图片的公共方法 * @param content 存储内容 * @param imgType 图片类型 * @param size 二维码尺寸 * @return */private BufferedImage qRCodeCommon(String content, String imgType, int size) {BufferedImage bufImg = null;try {Qrcode qrcodeHandler = new Qrcode();// 设置二维码排错率,可选L(7%)、M(15%)、Q(25%)、H(30%),排错率越高可存储的信息越少,但对二维码清晰度的要求越小qrcodeHandler.setQrcodeErrorCorrect('M');qrcodeHandler.setQrcodeEncodeMode('B');// 设置设置二维码尺寸,取值范围1-40,值越大尺寸越大,可存储的信息越大qrcodeHandler.setQrcodeVersion(size);// 获得内容的字节数组,设置编码格式byte[] contentBytes = content.getBytes("utf-8");// 图片尺寸int imgSize = 67 + 12 * (size - 1);bufImg = new BufferedImage(imgSize, imgSize, BufferedImage.TYPE_INT_RGB);Graphics2D gs = bufImg.createGraphics();// 设置背景颜色gs.setBackground(Color.WHITE);gs.clearRect(0, 0, imgSize, imgSize);// 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 < 800) {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, 800].");}gs.dispose();bufImg.flush();} catch (Exception e) {e.printStackTrace();}return bufImg;}/** * 解析二维码(QRCode) * @param imgPath 图片路径 * @return */public String decoderQRCode(String imgPath) {// QRCode 二维码图片的文件File imageFile = new File(imgPath);BufferedImage bufImg = null;String content = null;try {bufImg = ImageIO.read(imageFile);QRCodeDecoder decoder = new QRCodeDecoder();content = new String(decoder.decode(new TwoDimensionCodeImage(bufImg)), "utf-8"); } catch (IOException e) {System.out.println("Error: " + e.getMessage());e.printStackTrace();} catch (DecodingFailedException dfe) {System.out.println("Error: " + dfe.getMessage());dfe.printStackTrace();}return content;}/** * 解析二维码(QRCode) * @param input 输入流 * @return */public String decoderQRCode(InputStream input) {BufferedImage bufImg = null;String content = null;try {bufImg = ImageIO.read(input);QRCodeDecoder decoder = new QRCodeDecoder();content = new String(decoder.decode(new TwoDimensionCodeImage(bufImg)), "utf-8"); } catch (IOException e) {System.out.println("Error: " + e.getMessage());e.printStackTrace();} catch (DecodingFailedException dfe) {System.out.println("Error: " + dfe.getMessage());dfe.printStackTrace();}return content;}public static void main(String[] args) {String imgPath = "C:\\zhaochao.png";   String encoderContent ="";for(int i=0;i<40;i++)encoderContent+="赵";TwoDimensionCode handler = new TwoDimensionCode();    handler.encoderQRCode(encoderContent, imgPath, "png",10);System.out.println("=============编码成功!图片为于:"+imgPath+"===============");String decoderContent = handler.decoderQRCode(imgPath);System.out.println("============解析结果如下:===============");System.out.println(decoderContent);System.out.println("=========解码成功===========");}}

3.运行结果:

=============编码成功!图片为于:C:\zhaochao.png===========================解析结果如下:===============赵赵赵赵赵赵赵赵赵赵赵赵赵赵赵赵赵赵赵赵赵赵赵赵赵赵赵赵赵赵赵赵赵赵赵赵赵赵赵赵=========解码成功===========

4.所需QRCode.jar包及相关资料下载

http://download.csdn.net/detail/whzhaochao/6399309

5.反编译过来的源码下载

http://download.csdn.net/detail/whzhaochao/6403301
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