java 二维码解析和生成

package ykxw.web.qrcode.utils;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.*;
import javax.imageio.ImageIO;
import com.swetake.util.Qrcode;
import jp.sourceforge.qrcode.QRCodeDecoder;
import jp.sourceforge.qrcode.exception.DecodingFailedException;

public class QRCode {
    /**
     * 解析二维码(QRCode)
     * @param imgPath
     * @return
     */
    private static  String decoderQRCode(String imgPath) {
        // QRCode 二维码图片的文件  
        File imageFile = new File(imgPath);  
        BufferedImage bufImg = null;  
        String content = null;  
        try {  
            bufImg = ImageIO.read(imageFile);  
            QRCodeDecoder decoder = new QRCodeDecoder();  
            content = new String(decoder.decode(new QRCodeImageBean(bufImg)), "utf-8");   
        } catch (IOException e) {  
            System.out.println("Error: " + e.getMessage());  
            e.printStackTrace();  
        } catch (DecodingFailedException dfe) {  
            System.out.println("Error: " + dfe.getMessage());  
            dfe.printStackTrace();  
        }  
        return content;  
    }  
    /**  
     * 生成二维码(QRCode)图片  
     * @param content 存储内容  
     * @param imgType 图片类型
     */    
    private static byte[] encoderQRCode(String content,String imgType) {
        byte[] b = null;
        try {
            BufferedImage bufImg = qRCodeCommon(content, imgType, 7);
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            ImageIO.write(bufImg, imgType,out);
            b = out.toByteArray();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return b;
    }  
    /**  
     * 生成二维码(QRCode)图片  
     * @param content 存储内容  
     * @param imgPath 图片路径  
     * @param imgType 图片类型  
     * @param size 二维码尺寸  
     */    
    private static void encoderQRCode(String content, String imgPath, String imgType, int size) {
        try {    
            BufferedImage bufImg = qRCodeCommon(content, imgType, size);    
                
            File imgFile = new File(imgPath);    
            // 生成二维码QRCode图片    
            ImageIO.write(bufImg, imgType, imgFile);    
        } catch (Exception e) {    
            e.printStackTrace();    
        }    
    }



    /**  
     * 生成二维码(QRCode)图片的公共方法  
     * @param content 存储内容  
     * @param imgType 图片类型  
     * @param size 二维码尺寸  
     * @return  
     */    
    private static BufferedImage qRCodeCommon(String content, String imgType, int size) {    
        BufferedImage bufImg = null;    
        try {    
            Qrcode qrcodeHandler = new Qrcode();    
            // 设置二维码排错率,可选L(7%)、M(15%)、Q(25%)、H(30%),排错率越高可存储的信息越少,但对二维码清晰度的要求越小    
            qrcodeHandler.setQrcodeErrorCorrect('M');    
            qrcodeHandler.setQrcodeEncodeMode('B');    
            // 设置设置二维码尺寸,取值范围1-40,值越大尺寸越大,可存储的信息越大    
            qrcodeHandler.setQrcodeVersion(size);    
            // 获得内容的字节数组,设置编码格式    
            byte[] contentBytes = content.getBytes("utf-8");    
            // 图片尺寸    
            int imgSize = 67 + 12 * (size - 1);    
            bufImg = new BufferedImage(imgSize, imgSize, BufferedImage.TYPE_INT_RGB);    
            Graphics2D gs = bufImg.createGraphics();    
            // 设置背景颜色    
            gs.setBackground(Color.WHITE);    
            gs.clearRect(0, 0, imgSize, imgSize);    
    
            // 设定图像颜色> BLACK    
            gs.setColor(Color.BLACK);    
            // 设置偏移量,不设置可能导致解析出错    
            int pixoff = 2;    
            // 输出内容> 二维码    
            if (contentBytes.length > 0 && contentBytes.length < 800) {    
                boolean[][] codeOut = qrcodeHandler.calQrcode(contentBytes);    
                for (int i = 0; i < codeOut.length; i++) {    
                    for (int j = 0; j < codeOut.length; j++) {    
                        if (codeOut[j][i]) {    
                            gs.fillRect(j * 3 + pixoff, i * 3 + pixoff, 3, 3);    
                        }    
                    }    
                }    
            } else {    
                throw new Exception("QRCode content bytes length = " + contentBytes.length + " not in [0, 800].");    
            }    
            gs.dispose();    
            bufImg.flush();    
        } catch (Exception e) {    
            e.printStackTrace();    
        }    
        return bufImg;    
    }  

    private static void file(byte[] out) throws IOException {
        String imageName =  "F:/test.jpg";
        FileOutputStream fileOutputStream = new FileOutputStream(new File(imageName));
        fileOutputStream.write(out);
        fileOutputStream.close();
    }

    public static void main(String[] args) throws IOException {
        String encoderContent = "http://www.baidu.com";
        byte[] b =  new QRCode().encoderQRCode(encoderContent,"jpg");
        file(b);
    }


}

 

posted @ 2017-05-16 15:53  鹰语jyf  阅读(2886)  评论(0编辑  收藏  举报