涉及到的一些主要类库
编码lib：Qrcode_swetake.jar （官网介绍-- http://www.swetake.com/qr/index-e.html）
解码lib：qrcode.jar （官网介绍-- http://sourceforge.jp/projects/qrcode/）
编码：
QRCodeEncoderHandler.java
Java代码
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 [ sjsky007@gmail.com ]" + "\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：
解码：
QRCodeDecoderHandler.java
Java代码
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 [ sjsky007@gmail.com ]
Twitter [ @suncto ]
========decoder success!!!
这篇文章来自“红黑联盟”，原文地址如下：
http://www.2cto.com/kf/201108/98471.html