<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>

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ＭＡＰHashtable<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")));}}