二维码,是一种采用黑白相间的平面几何图形通过相应的编码算法来记录文字、图片、网址等信息的条码图片。如下图

一、Java
所需jar包:QRCode.jar
http://download.csdn.net/detail/wangpeng047/4008532
TwoDimensionCode类:二维码操作核心类
- package qrcode;
-
- 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 {
-
-
- public void encoderQRCode(String content, String imgPath) {
- this.encoderQRCode(content, imgPath, "png", 7);
- }
-
-
- public void encoderQRCode(String content, OutputStream output) {
- this.encoderQRCode(content, output, "png", 7);
- }
-
-
- public void encoderQRCode(String content, String imgPath, String imgType) {
- this.encoderQRCode(content, imgPath, imgType, 7);
- }
-
-
- public void encoderQRCode(String content, OutputStream output, String imgType) {
- this.encoderQRCode(content, output, imgType, 7);
- }
-
-
- public void encoderQRCode(String content, String imgPath, String imgType, int size) {
- try {
- BufferedImage bufImg = this.qRCodeCommon(content, imgType, size);
-
- File imgFile = new File(imgPath);
-
- ImageIO.write(bufImg, imgType, imgFile);
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
-
-
- public void encoderQRCode(String content, OutputStream output, String imgType, int size) {
- try {
- BufferedImage bufImg = this.qRCodeCommon(content, imgType, size);
-
- ImageIO.write(bufImg, imgType, output);
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
-
-
- private BufferedImage qRCodeCommon(String content, String imgType, int size) {
- BufferedImage bufImg = null;
- try {
- Qrcode qrcodeHandler = new Qrcode();
-
- qrcodeHandler.setQrcodeErrorCorrect(‘M‘);
- qrcodeHandler.setQrcodeEncodeMode(‘B‘);
-
- qrcodeHandler.setQrcodeVersion(size);
-
- byte[] contentBytes = content.getBytes("utf-8");
-
- int imgSize = 67 + 12 * (size - 1);
- bufImg = new BufferedImage(imgSize, imgSize, BufferedImage.TYPE_INT_RGB);
- Graphics2D gs = bufImg.createGraphics();
-
- gs.setBackground(Color.WHITE);
- gs.clearRect(0, 0, imgSize, imgSize);
-
-
- gs.setColor(Color.BLACK);
-
- int pixoff = 2;
-
- 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;
- }
-
-
- public String decoderQRCode(String imgPath) {
-
- 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;
- }
-
-
- 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 = "G:/TDDOWNLOAD/Michael_QRCode.png";
- String encoderContent = "Hello 大大、小小,welcome to QRCode!" + "\nMyblog [ http://sjsky.iteye.com ]" + "\nEMail [ sjsky007@gmail.com ]";
- TwoDimensionCode handler = new TwoDimensionCode();
- handler.encoderQRCode(encoderContent, imgPath, "png");
- System.out.println("========encoder success");
-
-
- String decoderContent = handler.decoderQRCode(imgPath);
- System.out.println("解析结果如下:");
- System.out.println(decoderContent);
- System.out.println("========decoder success!!!");
- }
- }
TwoDimensionCodeImage 类:二维码图片对象
- package qrcode;
-
- 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;
- }
-
- @Override
- public int getHeight() {
- return bufImg.getHeight();
- }
-
- @Override
- public int getPixel(int x, int y) {
- return bufImg.getRGB(x, y);
- }
-
- @Override
- public int getWidth() {
- return bufImg.getWidth();
- }
-
- }
二、.NET
所需dll:ThoughtWorks.QRCode
http://download.csdn.net/detail/wangpeng047/4008536
这里代码思路跟上述java大同小异,这里就不给出源码了,可参见http://download.csdn.net/detail/ywjq/3454011
上面的java代码,方便大家适用不同场合,希望对大家能有所帮助。
二维码生成与解析代码实现
原文:http://www.cnblogs.com/ljfpoison/p/4806421.html