<!-- 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>

 1 package com.example.demo.utils;
 2
 3 import com.google.zxing.*;
 4 import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
 5 import com.google.zxing.common.BitMatrix;
 6 import com.google.zxing.common.HybridBinarizer;
 7 import com.google.zxing.qrcode.QRCodeReader;
 8 import com.google.zxing.qrcode.QRCodeWriter;
 9 import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
10
11 import javax.imageio.ImageIO;
12 import java.awt.*;
13 import java.awt.image.BufferedImage;
14 import java.io.*;
15 import java.util.Hashtable;
16
17 /**
18  * @author zsh
19  * @company wlgzs
20  * @create 2019-03-10 15:17
21  * @Describe 二维码生成和读的工具类
22  */
23 public class QrCodeCreateUtil {
24     /**
25      * 生成包含字符串信息的二维码图片
26      * @param outputStream 文件输出流路径
27      * @param content 二维码携带信息
28      * @param qrCodeSize 二维码图片大小
29      * @param imageFormat 二维码的格式
30      * @throws WriterException
31      * @throws IOException
32      */
33     public static boolean createQrCode(OutputStream outputStream, String content, int qrCodeSize, String imageFormat) throws WriterException, IOException{
34         //设置二维码纠错级别ＭＡＰ
35         Hashtable<EncodeHintType, ErrorCorrectionLevel> hintMap = new Hashtable<EncodeHintType, ErrorCorrectionLevel>();
36         hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);  // 矫错级别
37         QRCodeWriter qrCodeWriter = new QRCodeWriter();
38         //创建比特矩阵(位矩阵)的QR码编码的字符串
39         BitMatrix byteMatrix = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, qrCodeSize, qrCodeSize, hintMap);
40         // 使BufferedImage勾画QRCode  (matrixWidth 是行二维码像素点)
41         int matrixWidth = byteMatrix.getWidth();
42         BufferedImage image = new BufferedImage(matrixWidth-200, matrixWidth-200, BufferedImage.TYPE_INT_RGB);
43         image.createGraphics();
44         Graphics2D graphics = (Graphics2D) image.getGraphics();
45         graphics.setColor(Color.WHITE);
46         graphics.fillRect(0, 0, matrixWidth, matrixWidth);
47         // 使用比特矩阵画并保存图像
48         graphics.setColor(Color.BLACK);
49         for (int i = 0; i < matrixWidth; i++){
50             for (int j = 0; j < matrixWidth; j++){
51                 if (byteMatrix.get(i, j)){
52                     graphics.fillRect(i-100, j-100, 1, 1);
53                 }
54             }
55         }
56         return ImageIO.write(image, imageFormat, outputStream);
57     }
58
59     /**
60      * 读二维码并输出携带的信息
61      */
62     public static void readQrCode(InputStream inputStream) throws IOException{
63         //从输入流中获取字符串信息
64         BufferedImage image = ImageIO.read(inputStream);
65         //将图像转换为二进制位图源
66         LuminanceSource source = new BufferedImageLuminanceSource(image);
67         BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
68         QRCodeReader reader = new QRCodeReader();
69         Result result = null ;
70         try {
71             result = reader.decode(bitmap);
72         } catch (ReaderException e) {
73             e.printStackTrace();
74         }
75         System.out.println(result.getText());
76     }
77     /**
78      * 测试代码
79      * @throws WriterException
80      */
81     public static void main(String[] args) throws IOException, WriterException {
82
83         createQrCode(new FileOutputStream(new File("d:\\qrcode.jpg")),"WE1231238239128sASDASDSADSDWEWWREWRERWSDFDFSDSDF123123123123213123",900,"JPEG");
84         readQrCode(new FileInputStream(new File("d:\\qrcode.jpg")));
85     }
86 }