生成和解析使用zxing，下载链接 https://pan.baidu.com/s/1zN6aXfnsAlUud11J-nxirQ

package comsxlg.match;import com.google.zxing.BarcodeFormat;import com.google.zxing.EncodeHintType;import com.google.zxing.MultiFormatWriter;import com.google.zxing.WriterException;import com.google.zxing.client.j2se.MatrixToImageWriter;import com.google.zxing.common.BitMatrix;import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;import java.io.*;import java.nio.file.Path;import java.util.HashMap;import java.util.Map;/** * 生成QRCode二维码 */public class CreateQRCode{    public static void writeCode()    {        int width = 300;        int height = 300;        String format = "png";        String content = "www.baidu.com";        // 定义二维码参数        Map params = new HashMap();        params.put(EncodeHintType.CHARACTER_SET,"utf-8"); // 设置字符编码        params.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);// 设置纠错等级        params.put(EncodeHintType.MARGIN,2);// 设置边距        try        {            // 设置内容，二维码类型，长度，宽度            BitMatrix  bitMatrix=  new MultiFormatWriter()                    .encode(content, BarcodeFormat.QR_CODE,width,height,params);            /*                方式一：直接输出文文件                // 获取保存路径                File file  = new File("D:/img.png");                if (!file.exists()){                    // 注意在创建文件时，如果存放文件的文件夹不存在，直接用createNewFile，会抛异常                    file.createNewFile();                }                Path path = file.toPath();                MatrixToImageWriter.writeToPath(bitMatrix,format,path);            */            // 输出到流            File file  = new File("D:/img1.png");            if (!file.exists()){                // 注意在创建文件时，如果存放文件的文件夹不存在，直接用createNewFile，会抛异常                file.createNewFile();            }            OutputStream out = new FileOutputStream(file);            MatrixToImageWriter.writeToStream(bitMatrix,format,out);            if (null != out ){                out.close();            }        }        catch (WriterException e)        {            e.printStackTrace();        }        catch (IOException e) {            e.printStackTrace();        }    }    public static void main(String[] args)    {        writeCode();    }}

 

package comsxlg.match;import com.google.zxing.*;import com.google.zxing.client.j2se.BufferedImageLuminanceSource;import com.google.zxing.common.HybridBinarizer;import javax.imageio.ImageIO;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.util.HashMap;import java.util.Map;/*** * 读取QR Code 二维码 */public class ReadQRCode{    public static void main(String[] args)    {        ReadCode();    }    private static void ReadCode()    {        MultiFormatReader reader = new MultiFormatReader();        try        {            //File file  = new File("D:/img.png");            File file  = new File("E:\\spring_boot\\springboot\\src\\main\\resources\\static\\qrcode.dib");            BufferedImage image = ImageIO.read(file);            BinaryBitmap binaryBitmap = new BinaryBitmap(                    new HybridBinarizer(new BufferedImageLuminanceSource(image)));            Map params = new HashMap();            params.put(EncodeHintType.CHARACTER_SET,"utf-8"); // 设置字符编码            Result result = reader.decode(binaryBitmap,params);            System.out.println("content is ："+result.getText());            System.out.println("format is ："+result.getBarcodeFormat());            System.out.println("result is ："+result.toString());        }        catch (IOException e)        {            e.printStackTrace();        }        catch (NotFoundException e)        {        }    }}