import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;

import javax.imageio.ImageIO;

import com.swetake.util.Qrcode;

import jp.sourceforge.qrcode.QRCodeDecoder;
import jp.sourceforge.qrcode.data.QRCodeImage;
import jp.sourceforge.qrcode.exception.DecodingFailedException;

public class QRCodeUtil {

	 public static void qrCodeEncode(String encodeddata, File destFile) throws IOException {  
	        Qrcode qrcode = new Qrcode();  
	        qrcode.setQrcodeErrorCorrect('M');  // 纠错级别（L 7%、M 15%、Q 25%、H 30%）和版本有关  
	        qrcode.setQrcodeEncodeMode('B');      
	        qrcode.setQrcodeVersion(7);     // 设置Qrcode包的版本  
	          
	        byte[] d = encodeddata.getBytes("GBK"); // 字符集  
	        BufferedImage bi = new BufferedImage(139, 139, BufferedImage.TYPE_INT_RGB);  
	        // createGraphics   // 创建图层  
	        Graphics2D g = bi.createGraphics();  
	          
	        g.setBackground(Color.WHITE);   // 设置背景颜色（白色）  
	        g.clearRect(0, 0, 139, 139);    // 矩形 X、Y、width、height  
	        g.setColor(Color.BLACK);    // 设置图像颜色（黑色）  
	  
	        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);  
	                    }  
	                }  
	            }  
	        }  
	          
//	      Image img = ImageIO.read(new File("D:/tt.png"));  logo  
//	      g.drawImage(img, 25, 55,60,50, null);  
	                  
	        g.dispose(); // 释放此图形的上下文以及它使用的所有系统资源。调用 dispose 之后，就不能再使用 Graphics 对象  
	        bi.flush(); // 刷新此 Image 对象正在使用的所有可重构的资源  
	  
	        ImageIO.write(bi, "png", destFile);  
//	        System.out.println("Input Encoded data is：" + encodeddata);  
	    }  
	  
	    /** 
	     * 解析二维码，返回解析内容 
	     *  
	     * @param imageFile 
	     * @return 
	     */  
	    public static String qrCodeDecode(File imageFile) {  
	        String decodedData = null;  
	        QRCodeDecoder decoder = new QRCodeDecoder();  
	        BufferedImage image = null;  
	        try {  
	            image = ImageIO.read(imageFile);  
	        } catch (IOException e) {  
	            System.out.println("Error: " + e.getMessage());  
	        }  
	  
	        try {  
	            decodedData = new String(decoder.decode(new J2SEImage(image)), "GBK");  
//	            System.out.println("Output Decoded Data is：" + decodedData);  
	        } catch (DecodingFailedException dfe) {  
	            System.out.println("Error: " + dfe.getMessage());  
	        } catch (UnsupportedEncodingException e) {  
	            e.printStackTrace();  
	        }  
	        return decodedData;  
	    }  
	  
	    static 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);  
	        }  
	    }  
	    
	    public static void main(String[] args) {  
	        String filePath = "d:/qrcode.png";  
	        File qrFile = new File(filePath);  
	  
	        // 二维码内容  
	        String encodeddata = "http://how2j.cn";  
	        try {  
	            QRCodeUtil.qrCodeEncode(encodeddata, qrFile);  
	        } catch (IOException e) {  
	            e.printStackTrace();  
	        }  
	  
	        // 解码  
	        String reText = QRCodeUtil.qrCodeDecode(qrFile);  
	        System.out.println(reText);  
	    }  
}