二维码的生成和解析

Zxing方式

 依赖：

        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>core</artifactId>
            <version>3.2.1</version>
        </dependency>
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>javase</artifactId>
            <version>3.3.1</version>
        </dependency>    

 

package com.tobiasy.toolkit.qrcode;

import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.client.j2se.MatrixToImageWriter;
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.io.IOException;
import java.nio.file.Path;
import java.util.Hashtable;

/**
 * @author tobiasy
 */
public class ZxingUtils {
    public static void main(String[] args) {
        createZxing();
        parse();
    }

    /**
     * 创建二维码
     */
    public static void createZxing() {
        String text = "https://www.cnblogs.com/tobiasy/";
        int width = 500;
        int height = 500;
        String format = "png";
        Hashtable hints = new Hashtable();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
        hints.put(EncodeHintType.MARGIN, 5);
        BitMatrix bitMatrix = null;
        try {
            bitMatrix = new MultiFormatWriter().encode(
                    text, BarcodeFormat.QR_CODE, width, height, hints);
            Path outputFile = new File("e:/new.png").toPath();
            MatrixToImageWriter.writeToPath(bitMatrix, format, outputFile);
        } catch (WriterException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 解析二维码
     */
    public static void parse() {
        MultiFormatReader formatReader = new MultiFormatReader();
        File file = new File("e:/291625446668002068.png");
        BufferedImage image = null;
        try {
            image = ImageIO.read(file);
            BinaryBitmap binaryBitmap = new BinaryBitmap(
                    new HybridBinarizer(
                            new BufferedImageLuminanceSource(image)));
            //定义二维码参数
            Hashtable hints = new Hashtable();
            hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
            hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
            hints.put(EncodeHintType.MARGIN, 5);
            Result result = formatReader.decode(binaryBitmap, hints);
            System.out.println(result.getText().toLowerCase());
        } catch (IOException e) {
            e.printStackTrace();
        } catch (NotFoundException e) {
            e.printStackTrace();
        }
    }
}

 Qrcode方式

 依赖：maven仓库里面没能找到相匹配的依赖

只能引入QRCode.jar包，jar文件地址：链接：https://pan.baidu.com/s/1cp1RNqcAFlToAM_TYCUjAg 密码：oknt

package com.tobiasy.toolkit.qrcode;

import com.google.zxing.NotFoundException;
import com.swetake.util.Qrcode;
import jp.sourceforge.qrcode.QRCodeDecoder;

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

/**
 * @author tobiasy
 */
public class QrCodeUtils {
    public static void main(String[] args) throws IOException, NotFoundException {
        createQrcode();
        parseQrcode();
    }

    /**
     * Qrcode生成二维码
     * @throws IOException
     */
    public static void createQrcode() throws IOException {
        Qrcode x = new Qrcode();
        x.setQrcodeErrorCorrect('M');//纠错等级
        x.setQrcodeEncodeMode('B');//N代表数字，A代表a-Z,B代表其他字符
        int version = 3;
        x.setQrcodeVersion(version);//版本
        String qrData = "https://www.cnblogs.com/tobiasy/";
        int width = 67 + 12 * (version - 1);
        int height = 67 + 12 * (version - 1);
        BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D gs = bufferedImage.createGraphics();
        gs.setBackground(Color.WHITE);
        gs.setColor(Color.BLACK);
        gs.clearRect(0, 0, width, height);

        int pixoff = 2;//偏移量

        byte[] d = qrData.getBytes("utf-8");
        if (d.length > 0 && d.length < 120) {
            boolean[][] s = x.calQrcode(d);
            for (int i = 0; i < s.length; i++) {
                for (int j = 0; j < s.length; j++) {
                    if (s[j][i]) {
                        gs.fillRect(j * 3 + pixoff, i * 3, 3, 3);
                    }
                }
            }
        }
        gs.dispose();
        bufferedImage.flush();
        ImageIO.write(bufferedImage, "png", new File("E:/qrcode.png"));
    }

    /**
     * Qrcode解析二维码
     * @throws IOException
     * @throws NotFoundException
     */
    public static void parseQrcode() throws IOException, NotFoundException {
        File file = new File("E:/qrcode.png");
        BufferedImage bufferedImage = ImageIO.read(file);
        QRCodeDecoder codeDecoder = new QRCodeDecoder();
        String result = new String(codeDecoder.decode(
                new MyQRCodeImage(bufferedImage)), "utf-8");
        System.out.println(result);
    }
}

 注意：当二维码中存放网址路径时，需要http://打头二维码才会自动打开网址