二维码

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)
        {

        }
    }
}