<!-- 谷歌zxing 二维码 -->

<dependency>

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

    <artifactId>core</artifactId>

    <version>3.3.3</version>

</dependency>

<dependency>

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

    <artifactId>javase</artifactId>

    <version>3.3.3</version>

</dependency>

 package com.example.demo.utils;

 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.QRCodeReader;

 import com.google.zxing.qrcode.QRCodeWriter;

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

 import javax.imageio.ImageIO;

 import java.awt.*;

 import java.awt.image.BufferedImage;

 import java.io.*;

 import java.util.Hashtable;

 /**

  * @author zsh

  * @company wlgzs

  * @create 2019-03-10 15:17

  * @Describe 二维码生成和读的工具类

  */

 public class QrCodeCreateUtil {

     /**

      * 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 {

         createQrCode(new FileOutputStream(new File("d:\\qrcode.jpg")),"WE1231238239128sASDASDSADSDWEWWREWRERWSDFDFSDSDF123123123123213123",900,"JPEG");

         readQrCode(new FileInputStream(new File("d:\\qrcode.jpg")));

     }

 }