链接转二维码

pom依赖

<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.3.0</version>
</dependency>

实现Demo

package com.example.demo.util;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.ResourceUtils;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

/**
 * @author suaxi
 * @date 2021/12/13 9:48
 */
@Slf4j
public class QRCodeUtil {

    public static void main(String[] args) throws FileNotFoundException {
        String url = "https://wangchouchou.com";
        //String path = FileSystemView.getFileSystemView().getHomeDirectory() + File.separator + "testQrcode";
        String realPath = ResourceUtils.getURL("classpath:").getPath() + "static/QRCode/";
        String fileName = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date()) + ".jpg";
        createQRCode(url, realPath, fileName);
    }

    public static String createQRCode(String url, String path, String fileName) {
        try {
            Map<EncodeHintType, Object> map = new HashMap<>();
            map.put(EncodeHintType.CHARACTER_SET, "UTF-8");
            BitMatrix bitMatrix = new MultiFormatWriter().encode(url, BarcodeFormat.QR_CODE, 400, 400, map);
            File file = new File(path, fileName);
            if (file.exists() || (file.getParentFile().exists() || file.getParentFile().mkdirs()) && file.createNewFile()) {
                writeToFile(bitMatrix, "jpg", file);
                log.info(url + "转二维码成功");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    private static void writeToFile(BitMatrix bitMatrix, String format, File file) throws IOException {
        BufferedImage image = toBufferedImage(bitMatrix);
        if (!ImageIO.write(image, format, file)) {
            throw new IOException("Could not write an image of format " + format + " to " + file);
        }
    }

    private static void writeStream(BitMatrix bitMatrix, String format, OutputStream outputStream) throws IOException {
        BufferedImage image = toBufferedImage(bitMatrix);
        if (!ImageIO.write(image, format, outputStream)) {
            throw new IOException("Could not write an image of format " + format + " to " + format);
        }
    }

    private static final int BLACK = 0xFF000000;
    private static final int WHITE = 0xFFFFFFFF;

    private static BufferedImage toBufferedImage(BitMatrix bitMatrix) {
        int width = bitMatrix.getWidth();
        int height = bitMatrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                image.setRGB(x, y, bitMatrix.get(x, y) ? BLACK : WHITE);
            }
        }
        return image;
    }
}