ZXing生成二维码、读取二维码

时间：2023-03-09 09:33:13
ZXing生成二维码、读取二维码

使用谷歌的开源包ZXing

maven引入如下两个包即可

<dependency>  

	<groupId>com.google.zxing</groupId> 

	<artifactId>core</artifactId> 

	<version>3.3.0</version>

</dependency>

<dependency>

	<groupId>com.google.zxing</groupId>

	<artifactId>javase</artifactId>

	<version>3.0.0</version>

</dependency>

　　

1、工具类

package com.unicom.zxing;

import com.google.zxing.*;

import com.google.zxing.common.BitMatrix;

import com.google.zxing.common.HybridBinarizer;

import com.google.zxing.qrcode.QRCodeReader;

import com.google.zxing.qrcode.QRCodeWriter;

import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import com.google.zxing.client.j2se.BufferedImageLuminanceSource;

import javax.imageio.ImageIO;

import java.awt.*;

import java.awt.image.BufferedImage;

import java.io.*;

import java.util.Hashtable;

/**

 * 二维码生成和读的工具类

 *

 */

public class ZXingUtil {

    /**

     * 生成包含字符串信息的二维码图片

     * @param outputStream 文件输出流路径

     * @param content 二维码携带信息

     * @param qrCodeSize 二维码图片大小

     * @param imageFormat 二维码的格式

     * @throws WriterException

     * @throws IOException

     */

    public static boolean createQrCode(OutputStream outputStream, String content, int qrCodeSize, String imageFormat) throws WriterException, IOException{

        //设置二维码纠错级别ＭＡＰ

        Hashtable<EncodeHintType, ErrorCorrectionLevel> hintMap = new Hashtable<EncodeHintType, ErrorCorrectionLevel>();

        hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);  // 矫错级别

        QRCodeWriter qrCodeWriter = new QRCodeWriter();

        //创建比特矩阵(位矩阵)的QR码编码的字符串

        BitMatrix byteMatrix = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, qrCodeSize, qrCodeSize, hintMap);

        // 使BufferedImage勾画QRCode  (matrixWidth 是行二维码像素点)

        int matrixWidth = byteMatrix.getWidth();

        BufferedImage image = new BufferedImage(matrixWidth-200, matrixWidth-200, BufferedImage.TYPE_INT_RGB);

        image.createGraphics();

        Graphics2D graphics = (Graphics2D) image.getGraphics();

        graphics.setColor(Color.WHITE);

        graphics.fillRect(0, 0, matrixWidth, matrixWidth);

        // 使用比特矩阵画并保存图像

        graphics.setColor(Color.BLACK);

        for (int i = 0; i < matrixWidth; i++){

            for (int j = 0; j < matrixWidth; j++){

                if (byteMatrix.get(i, j)){

                    graphics.fillRect(i-100, j-100, 1, 1);

                }

            }

        }

        return ImageIO.write(image, imageFormat, outputStream);

    }

    /**

     * 读二维码并输出携带的信息

     */

    public static void readQrCode(InputStream inputStream) throws IOException{

        //从输入流中获取字符串信息

        BufferedImage image = ImageIO.read(inputStream);

        //将图像转换为二进制位图源

        LuminanceSource source = new BufferedImageLuminanceSource(image);

        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

        QRCodeReader reader = new QRCodeReader();

        Result result = null ;

        try {

            result = reader.decode(bitmap);

        } catch (ReaderException e) {

            e.printStackTrace();

        }

        System.out.println(result.getText());

    }

    /**

     * 测试代码

     * @throws WriterException

     */

    public static void main(String[] args) throws IOException, WriterException {

        //生成二维码到E盘

        createQrCode(new FileOutputStream(new File("E:\\test.jpg")),"https://www.baidu.com/",900,"JPEG");

        //下面是读取二维码内容

        readQrCode(new FileInputStream(new File("E:\\test.jpg")));

    }

}

直接运行Main方法，即可在E盘生成二维码

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