週末試用下Android手機的二維碼掃描軟件,掃描了下火車票、名片等等,以爲很是不錯頗有意思的。固然Java也能夠實現這些,如今就分享下如何簡單用Java實現二維碼中QRCode的編碼和解碼(能夠手機掃描驗證)。html
涉及到的一些主要類庫,方便你們下載:java
編碼lib:Qrcode_swetake.jar (官網介紹-- http://www.swetake.com/qr/index-e.html) android
解碼lib:qrcode.jar (官網介紹-- http://sourceforge.jp/projects/qrcode/)測試
【一】、編碼:this
QRCodeEncoderHandler.java編碼
Java代碼 .net
package michael.qrcode; code
import java.awt.Color; htm
import java.awt.Graphics2D; blog
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;
import com.swetake.util.Qrcode;
/**
* 二維碼生成器
* @blog http://sjsky.iteye.com
* @author Michael
*/
public class QRCodeEncoderHandler {
/**
* 生成二維碼(QRCode)圖片
* @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);
// 設定圖像顏色> BLACK
gs.setColor(Color.BLACK);
// 設置偏移量 不設置可能致使解析出錯
int pixoff = 2;
// 輸出內容> 二維碼
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);
// 生成二維碼QRCode圖片
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");
}
}
運行後生成的二維碼圖片以下:
此時就可用手機的二維碼掃描軟件(本人用的:android 快拍二維碼 )來測試下,識別成功的截圖以下:
喜歡的朋友能夠下載後試一試,作一些名片或者本身喜歡的東西。固然Java也能夠對二維碼圖片解碼,具體看下面關於解碼的內容。
【二】、解碼:
QRCodeDecoderHandler.java
Java代碼
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 {
/**
* 解碼二維碼
* @param imgPath
* @return String
*/
public String decoderQRCode(String imgPath) {
// QRCode 二維碼圖片的文件
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("解析結果以下:");
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);
}
}
}
運行結果以下(解碼出的內容和以前輸入的內容一致 ):
解析結果以下:
Hello 大大、小小,welcome to QRCode!
Myblog [ http://sjsky.iteye.com ]
EMail [ sjsky007@gmail.com ]
Twitter [ @suncto ]
========decoder success!!!
轉自:http://www.2cto.com/kf/201108/98471.html