谷歌zxing 二维码生成工具

一、加入maven依赖

<!-- 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>

二、工具类代码

 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")));
     }
 }

效果图：