zxing生成识别二维码

原创

秋夜雨巷 2022-01-20 11:18:06 ©著作权

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二维码的生成与识别

概述

ZXing是一个开源Java类库用于解析多种格式的1D/2D条形码。目标是能够对QR编码、Data Matrix、UPC的1D条形码进行解码。其提供了多种平台下的客户端包括：J2ME、J2SE和Android。

Maven坐标

<dependencies>
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>core</artifactId>
            <version>3.4.0</version>
        </dependency>
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>javase</artifactId>
            <version>3.3.1</version>
        </dependency>
    </dependencies>

Java代码

LogoUtil.java

logo绘制工具类

将logo绘制到二维码图片中

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

public class LogoUtil {
    //传入logo、二维码 ->带logo的二维码
    public  static BufferedImage  logoMatrix( BufferedImage matrixImage,String logo ) throws IOException {
        //在二维码上画logo:产生一个  二维码画板
        Graphics2D g2 = matrixImage.createGraphics();

        //画logo： String->BufferedImage(内存)
        BufferedImage logoImg = ImageIO.read(new File(logo));
        int height = matrixImage.getHeight();
        int width = matrixImage.getWidth();
        //纯logo图片
        g2.drawImage(logoImg, width * 2 / 5, height * 2 / 5, width * 1 / 5, height * 1 / 5, null);

        //产生一个 画 白色圆角正方形的 画笔
        BasicStroke stroke = new BasicStroke(5, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);
        //将画板-画笔 关联
        g2.setStroke(stroke);
        //创建一个正方形
        RoundRectangle2D.Float round = new RoundRectangle2D.Float(width * 2 / 5, height * 2 / 5, width * 1 / 5, height * 1 / 5, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);
        g2.setColor(Color.WHITE);
        g2.draw(round);

        //灰色边框
        BasicStroke stroke2 = new BasicStroke(1, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);
        g2.setStroke(stroke2);
        //创建一个正方形
        RoundRectangle2D.Float round2 = new RoundRectangle2D.Float(width * 2 / 5 + 2, height * 2 / 5 + 2, width * 1 / 5 - 4, height * 1 / 5 - 4, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);

        g2.setColor(Color.GRAY);
        g2.draw(round2);

        g2.dispose();
        matrixImage.flush();

        return matrixImage;
    }
}

ZXingUtil.java

绘制、读取二维码工具类

import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;

public class ZXingUtil {
    /**
     * 生成二维码
     * @param imgPath 生成的二维码保存路径
     * @param format 二维码图片格式 例如: png
     * @param content 二维码内容
     * @param width 宽度 430
     * @param height 高度 430
     * @param logo logo图标路径
     * @throws Exception
     */
    public static void encodeImg(String imgPath,String format,String content,int width,int height,String logo) throws Exception {
        if (format == null || format.trim().length()==0){
            format = "png";
        }
        Hashtable<EncodeHintType,Object > hints = new Hashtable<EncodeHintType,Object>() ;
        //排错率  L<M<Q<H
        hints.put( EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H) ;
        //编码
        hints.put( EncodeHintType.CHARACTER_SET, "utf-8") ;
        //外边距：margin
        hints.put( EncodeHintType.MARGIN, 1) ;
        /*
         * content : 需要加密的 文字
         * BarcodeFormat.QR_CODE:要解析的类型（二维码）
         * hints：加密涉及的一些参数：编码、排错率
         */
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE,width,height, hints);
        //内存中的一张图片：此时需要的图片 是二维码-> 需要一个boolean[][] ->BitMatrix
        BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);

        for(int x=0;x<width;x++) {
            for(int y=0;y<height;y++) {
                image.setRGB(x, y,     (bitMatrix.get(x,y)? 0x000000:0xFFFFFF)  );
            }
        }
        //画logo
        if (logo!=null && logo.trim().length()>0){
            image = LogoUtil.logoMatrix(image, logo);
        }
        //string->file
        File file = new File(imgPath);
        //生成图片
        ImageIO.write(image, format, file);
    }

    //解密：二维码->文字
    public static String decodeImg(File file) throws Exception {
        if(!file.exists()) return null;
        //file->内存中的一张图片
        BufferedImage imge = ImageIO.read(file);

        MultiFormatReader formatReader = new MultiFormatReader();
        LuminanceSource source = new BufferedImageLuminanceSource(imge);
        Binarizer binarizer = new HybridBinarizer(source);
        BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);
        //图片 ->result
        Map map = new HashMap();
        map.put(EncodeHintType.CHARACTER_SET, "utf-8");
        Result result = formatReader.decode(binaryBitmap  ,map);

        System.out.println("解析结果："+ result.toString());
        return result.toString();
    }


    public static void main(String[] args) throws Exception {
        //读取二维码
        //解密：二维码->文字信息
        String qrurl = decodeImg(new File("C:\\Users\\Administrator\\Pictures\\健康码1.jpg"));

        //生成二维码
        String imgPath = "D:/out.png";
        String content = qrurl;
        String logo = "C:\\Users\\Administrator\\Pictures\\刘亦菲\\刘亦菲01.jpg";
        //加密：文字信息->二维码
        ZXingUtil.encodeImg(imgPath, "png",content, 430, 430,logo);
    }

}