二维码生成与扫描

/*需要导入以下jar包
*QRCode.jar、Qrcodeen.jar
*/
//生成二维码
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;
public class QRCodeEncoderTest {
public QRCodeEncoderTest() throws Exception{
Qrcode qrcode = new Qrcode();
qrcode.setQrcodeErrorCorrect('M');
qrcode.setQrcodeEncodeMode('B');
qrcode.setQrcodeVersion(7);
String encodeddata = "{id:10022,name:wandern}";
byte[] d = encodeddata.getBytes("utf-8");
BufferedImage bi = new BufferedImage(139, 139, BufferedImage.TYPE_INT_RGB);
// createGraphics
Graphics2D g = bi.createGraphics();
// set background
g.setBackground(Color.WHITE);
g.clearRect(0, 0, 139, 139);
g.setColor(Color.BLACK);
if (d.length > 0 && d.length < 123) {
boolean[][] b = qrcode.calQrcode(d);
for (int i = 0; i < b.length; i++) {
for (int j = 0; j < b.length; j++) {
if (b[j][i]) {
g.fillRect(j * 3 + 2, i * 3 + 2, 3, 3);
}
}
}
}
g.dispose();
bi.flush();
String FilePath = "F:\\QRCode.png";
File f = new File(FilePath);
ImageIO.write(bi, "png", f);
System.out.println("Input Encoded data is："+encodeddata);
}
//测试
public static void main(String[] args) throws Exception {
QRCodeEncoderTest qRCodeEncoderTest=new QRCodeEncoderTest();
}
}
//二维码扫描
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import javax.imageio.ImageIO;
import jp.sourceforge.qrcode.QRCodeDecoder;
import jp.sourceforge.qrcode.data.QRCodeImage;
import jp.sourceforge.qrcode.exception.DecodingFailedException;
public class QRCodeDecoderTest {
public QRCodeDecoderTest() {
QRCodeDecoder decoder = new QRCodeDecoder();
File imageFile = new File("F:\\QRCode.png");  //生成的二位码图片
BufferedImage image = null;
try {
image = ImageIO.read(imageFile);
} catch (IOException e) {
System.out.println("Error: " + e.getMessage());
}
try {
String decodedData = new String(decoder.decode(new J2SEImage(image)), "utf-8");
System.out.println("Output Decoded Data is："+decodedData);
} catch (DecodingFailedException dfe) {
System.out.println("Error: " + dfe.getMessage());
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
//测试
public static void main(String[] args) {
QRCodeDecoderTest cRCodeDecoderTest=new QRCodeDecoderTest();
}
}
class J2SEImage implements QRCodeImage {
BufferedImage image;
public J2SEImage(BufferedImage image) {
this.image = image;
}
public int getWidth() {
return image.getWidth();
}
public int getHeight() {
return image.getHeight();
}
public int getPixel(int x, int y) {
return image.getRGB(x, y);
}
}