二維碼生成並在下方添加文字，打包下載

Maven依賴

<!-- 二維碼生成  -->
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>core</artifactId>
            <version>3.4.0</version>
        </dependency>
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>javase</artifactId>
            <version>3.4.0</version>
        </dependency>

壓縮工具類

package com.ruoyi.common.utils;

import org.springframework.stereotype.Component;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

/**
 * @author: 程鵬
 * @date: 2021-08-31 10:53
 * @Description:
 */
@Component
public class ZipUtil {

    /**
     * @param needZipPath 壓縮文件夾路徑
     * @param out         壓縮文件輸出流
     */
    public static void filetoZip(String needZipPath, OutputStream out)throws RuntimeException{
        long start = System.currentTimeMillis();//計算壓縮所需要的時間
        ZipOutputStream zos = null ;
        try {
            zos = new ZipOutputStream(out);
            File sourceFile = new File(needZipPath);//獲取要壓縮的文件
            do_file_toZip(sourceFile,zos,"barCode");//開始壓縮
            long end = System.currentTimeMillis();
            long useTime = end - start;//壓縮耗費的時間
            System.err.println("本次壓縮，耗時" + useTime + "毫秒");
        } catch (Exception e) {
            throw new RuntimeException("壓縮失敗了，呵呵",e);
        }finally{
            if(zos != null){
                try {
                    zos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    /**
     * 遞歸壓縮方法
     * @param sourceFile   源文件
     * @param zos         zip輸出流
     * @param name        壓縮后的名稱
     */
    private static void do_file_toZip(File sourceFile, ZipOutputStream zos, String name) throws Exception {
        byte[] buf = new byte[1024 * 2];
        if (sourceFile.isFile()) {
            // 向zip輸出流中添加一個zip實體，構造器中name為zip實體的文件的名字
            zos.putNextEntry(new ZipEntry(name));
            // copy文件到zip輸出流中
            int len;
            FileInputStream in = new FileInputStream(sourceFile);
            while ((len = in.read(buf)) != -1) {
                zos.write(buf, 0, len);
            }
            zos.closeEntry();
            in.close();
        } else {
            File[] listFiles = sourceFile.listFiles();
            if (listFiles == null || listFiles.length == 0) {
                // 需要保留原來的文件結構時,需要對空文件夾進行處理
                zos.putNextEntry(new ZipEntry(name + "/"));// 空文件夾的處理
                zos.closeEntry();// 沒有文件，不需要文件的copy
            } else {
                for (File file : listFiles) {
                    // 判斷是否需要保留原來的文件結構
                    // 注意：file.getName()前面需要帶上父文件夾的名字加一斜杠,
                    // 不然最后壓縮包中就不能保留原來的文件結構,即：所有文件都跑到壓縮包根目錄下了
                    do_file_toZip(file, zos, name + "/" + file.getName());
                }
            }
        }
    }

}

二維碼生成工具類

package com.ruoyi.common.utils;

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.MatrixToImageConfig;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.CharacterSetECI;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import org.springframework.stereotype.Component;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.HashMap;

/**
 * Author  程鵬
 * Date： 2021/08/27 16:01
 * Description:二維碼生成工具類
 */
@Component
public class BarcodeUtils {
    private static final Color QRCOLOR = Color.black; // 二維碼顏色 默認是黑色
    private static final Color BGWHITE = Color.white; // 背景顏色
    public static final int WIDTH = 360;
    public static final int HEIGHT = 512;
    public static final int MARGIN = 2;
    public static final int FONTSIZE = 20;


    /**
     * // 二維碼生成
     *
     * @param contents 說明
     * @return BufferedImage
     * @throws Exception
     */
    public    BufferedImage drawQRImage(String pressText,String contents) throws Exception {
        BufferedImage qRImage = null;

        if (contents == null || "".equals(contents)) {
            throw new Exception("content說明不能為空");
        }

        // 二維碼參數設置
        HashMap<EncodeHintType, Object> hints = new HashMap<>();
        hints.put(EncodeHintType.CHARACTER_SET, CharacterSetECI.UTF8); // 編碼設置
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); // 安全等級，最高h
        hints.put(EncodeHintType.MARGIN, MARGIN); // 設置margin=0-10

        // 二維碼圖片的生成
        BarcodeFormat format = BarcodeFormat.QR_CODE;

        // 創建矩陣容器

        BitMatrix matrix = null;

        try {
            matrix = new MultiFormatWriter().encode(contents, format, WIDTH, HEIGHT, hints);
        } catch (WriterException e) {
            e.printStackTrace();
        }

        // 設置矩陣轉為圖片的參數
        MatrixToImageConfig toImageConfig = new MatrixToImageConfig(QRCOLOR.getRGB(), BGWHITE.getRGB());

        // 矩陣轉換圖像
        qRImage = MatrixToImageWriter.toBufferedImage(matrix, toImageConfig);

//        pressText(pressText, qRImage);
        return pressText(pressText, qRImage);
    }

    /**
     * @param pressText 二維碼下方插入文字
     * @param image     需要添加文字的圖片
     * @為圖片添加文字
     */
    public   BufferedImage pressText(String pressText, BufferedImage image) throws Exception {

        BufferedImage outImage = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);

        //計算文字開始的位置
        //x開始的位置：（圖片寬度-字體大小*字的個數）/2
        int startX = (WIDTH - (FONTSIZE * pressText.length())) / 2;
        //y開始的位置：圖片高度-（圖片高度-圖片寬度）/2
        int startY = HEIGHT - (HEIGHT - WIDTH) / 2 ;

        int imageW = outImage.getWidth();
        int imageH = outImage.getHeight();
//            BufferedImage image = new BufferedImage(imageW, imageH, BufferedImage.TYPE_INT_RGB);
        Graphics2D g = outImage.createGraphics();
        g.drawImage(image, 0, 0, imageW, imageH, null);
        g.setColor(QRCOLOR);
        g.setFont(new Font("微軟雅黑", Font.BOLD, FONTSIZE));
        g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
        g.setBackground(Color.white);
//        獲取文字數量  按照字節展示
        int size = pressText.getBytes("GBK").length;
//        獲取一行最多能容納多少文字   按照文字字節展示
        int maxSize = (WIDTH / FONTSIZE - 2)*2;
        if (size > maxSize) {
            int v = size % maxSize;
            for (int a = 0; a < (size / maxSize); a++) {
//                g.drawString(pressText.substring(a * maxSize, (a + 1) * maxSize), (WIDTH - (FONTSIZE * maxSize)) / 2 , startY);
                String s = outStringByByte(pressText, maxSize);
                g.drawString(s, (WIDTH - (FONTSIZE * (WIDTH / FONTSIZE - 2))) / 2 , startY);
                pressText=pressText.substring(s.length(),pressText.length());
                startY = startY + 30;
            }
            if (v != 0) {
                g.drawString(pressText, (WIDTH - (FONTSIZE * v)) / 2 , startY);
            }

        } else {
            g.drawString(pressText, (WIDTH-((pressText.getBytes("GBK").length)/2)*FONTSIZE)/2 , startY);

        }

        g.dispose();

        return outImage;
    }


    /**
     * 保存二維碼圖片到本地
     * @param contents
     * @throws Exception
     */
    public void createImg(String pressText,String contents,String filename,String filePath) throws Exception {
            BufferedImage qRImageWithLogo = drawQRImage(pressText,contents);
            // 寫入返回
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            ImageIO.write(qRImageWithLogo, "jpg", baos);
            //圖片類型
            String imageType = "jpg";
            //生成二維碼存放文件
            File file = new File(filePath+filename+".jpg");
        if(!file.exists()){
            file.mkdirs();
        }
            ImageIO.write(qRImageWithLogo, imageType, file);
            baos.close();
    }



    /**
     * @param fileName 文件名字
     * @param path 路徑 具體到要下載的文件名字
     * @param delete 下載完成是否刪除
     * @param response
     * @return
     */
    public String downLoadFile(String fileName, String path,boolean delete, HttpServletResponse response) {
        try {
            File file = new File(path);
            response.setCharacterEncoding("UTF-8");
            response.setHeader("Content-Disposition",
                    "attachment; filename=" + new String(fileName.getBytes("UTF-8"), "ISO8859-1"));
            response.setContentLength((int) file.length());
            //定義輸出類型
            response.setContentType("application/zip");
            FileInputStream fis = new FileInputStream(file);
            BufferedInputStream buff = new BufferedInputStream(fis);
            //相當於我們的緩存
            byte[] b = new byte[1024];
            //該值用於計算當前實際下載了多少字節
            long k = 0;
            //從response對象中得到輸出流,准備下載
            OutputStream myout = response.getOutputStream();
            //開始循環下載
            while (k < file.length()) {
                int j = buff.read(b, 0, 1024);
                k += j;
                myout.write(b, 0, j);
            }
            myout.flush();
            fis.close();
            buff.close();
            if (delete) {
                file.delete();
            }
        } catch (Exception e) {
            System.out.println(e);
        }
        return null;
    }


    public  void deleteDir(String path){
        File file = new File(path);
        if(!file.exists()){//判斷是否待刪除目錄是否存在
            System.err.println("The dir are not exists!");
        }


        String[] content = file.list();//取得當前目錄下所有文件和文件夾
        for(String name : content){
            File temp = new File(path, name);
            if(temp.isDirectory()){//判斷是否是目錄
                deleteDir(temp.getAbsolutePath());//遞歸調用，刪除目錄里的內容
                temp.delete();//刪除空目錄
            }else{
                if(!temp.delete()){//直接刪除文件
                    System.err.println("Failed to delete " + name);
                }
            }
        }
        file.delete();
    }



    private static String outStringByByte(String str, int len) throws IOException {

        byte[] btf = str.getBytes("gbk");
        int count = 0;

        for (int j = len - 1; j >= 0; j--) {
            if (btf[j] < 0)
                count++;
            else
                break;

        }

        if (count % 2 == 0)
            return new String(btf, 0, len, "gbk");
        else
            return new String(btf, 0, len - 1, "gbk");

    }





}