java二维码编码和解析

package com.banmacoffee.utils;

 

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 QRCodeUtils {

 

     /**

      * 编码字符串内容到目标File对象中

      * @param encodeddata

      * @param destFile

      * @throws IOException

      */

     public static void qrCodeEncode(String encodeddata,File destFile) throws IOException{

         Qrcode qrcode = new Qrcode();

         qrcode.setQrcodeErrorCorrect( 'M' );

         qrcode.setQrcodeEncodeMode( 'B' );

         qrcode.setQrcodeVersion( 7 );

         byte [] d = encodeddata.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();

 

         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;

     }

     

     public static void main(String[] args) {

         String FilePath = "C:\\Demo\\QRCode.png" ;

         File qrFile = new File(FilePath);

         

         //编码

         String encodeddata = "{id:10022,name:wandern}" ;

         try {

             QRCodeUtils.qrCodeEncode(encodeddata, qrFile);

         } catch (IOException e) {

             // TODO Auto-generated catch block

             e.printStackTrace();

         };

         

         

         //解码

         String reText = QRCodeUtils.qrCodeDecode(qrFile);

         System.out.println(reText);

     }

}

 

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);

     }

}