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);

    }

}