二维码QRCode开源实现

日本人写的解码与编码实现Sourceforge.jp与swetake.com

这里把它们merge到一个jar文件里。

编码测试：

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 static void main(String[] args) throws Exception {
		Qrcode qrcode=new Qrcode();
		qrcode.setQrcodeErrorCorrect('M');
		qrcode.setQrcodeEncodeMode('B');
		qrcode.setQrcodeVersion(7);

		String testString = "_-+^%$#@!~`=&)*(";
		
		byte[] d =testString.getBytes("GBK");
		
		
        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="TestQRCode.png";
        File f = new File(FilePath);
		
		ImageIO.write(bi, "png", f);
		System.out.println("doned!");
	}
	
}

解码测试：

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() {
    }
    
    public static void main(String[] args) {
        
        QRCodeDecoder decoder = new QRCodeDecoder();
        
        File imageFile = new File("TestQRCode.png");
        
        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)),"GBK");
			
            System.out.println(decodedData);
        } catch (DecodingFailedException dfe) {
            System.out.println("Error: " + dfe.getMessage());
        } catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
        
        
    }
}
 
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);
    }
    
}

评论

4 楼 eppen 2011-09-15  

QR-CODE，例子里面生成的是139×139的图片，
最小可以多大？

3 楼 eppen 2011-04-07  

合并之后日本人那个库（Open Source QR Code Library Project
http://sourceforge.jp/projects/qrcode/ ）说有几种不能解码的，你这个库可以解码了？

2 楼 omica 2010-09-26  

很好用，谢谢。。。

1 楼 xyflash 2010-05-27  

解密出错  提示：Give up decoding ...