此方法經過測試，上傳到頁面與儲存到本地是可以執行的

也可以對其加入logo

頁面加入logo我沒有進行嘗試，如果需要自己可以根據需求更改工具程式碼

如果要加入logo，記得縮放顯示logo，下面這個條件傳入true

引入maven

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

工具方法

package com.dosion.core.common.utils;

import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.OutputStream;
import java.util.Hashtable;

public class QRCodeUtil {
    private static final String CHARSET = "utf-8";
    private static final String FORMAT_NAME = "JPG";
    // 二維碼尺寸
    private static final int QRCODE_SIZE = 300;
    // LOGO寬度
    private static final int WIDTH = 60;
    // LOGO高度
    private static final int HEIGHT = 60;


    /**
     * 生成二維碼
     * @param content   源內容
     * @param imgPath   生成二維碼儲存的路徑
     * @param needCompress  是否要壓縮
     * @return      返回二維碼圖片
     * @throws Exception
     */
    private static BufferedImage createImage(String content, String imgPath, boolean needCompress) throws Exception {
        Hashtable hints = new Hashtable();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE,
                hints);
        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) ? 0xFF000000 : 0xFFFFFFFF);
            }
        }
        if (imgPath == null || "".equals(imgPath)) {
            return image;
        }
        // 插入圖片
        QRCodeUtil.insertImage(image, imgPath, needCompress);
        return image;
    }

    /**
     * 在生成的二維碼中插入圖片
     * @param source
     * @param imgPath
     * @param needCompress
     * @throws Exception
     */
    private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws Exception {
        File file = new File(imgPath);
        //System.out.println(file+"****************************");
        if (!file.exists()) {
            System.err.println("" + imgPath + "   該檔案不存在！");
            return;
        }
        Image src = ImageIO.read(new File(imgPath));
        int width = src.getWidth(null);
        int height = src.getHeight(null);
        if (needCompress) { // 壓縮LOGO
            if (width > WIDTH) {
                width = WIDTH;
            }
            if (height > HEIGHT) {
                height = HEIGHT;
            }
            Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
            BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics g = tag.getGraphics();
            g.drawImage(image, 0, 0, null); // 繪製縮小後的圖
            g.dispose();
            src = image;
        }
        // 插入LOGO
        Graphics2D graph = source.createGraphics();
        int x = (QRCODE_SIZE - width) / 2;
        int y = (QRCODE_SIZE - height) / 2;
        graph.drawImage(src, x, y, width, height, null);
        Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
        graph.setStroke(new BasicStroke(3f));
        graph.draw(shape);
        graph.dispose();
    }

    /**
     * 生成帶logo二維碼，並儲存到磁碟
     * @param content   連結或者內容
     * @param imgPath   logo圖片
     * @param destPath  儲存二維碼圖片的檔案路徑
     * @param needCompress
     * @throws Exception
     */
    public static Boolean saveLocal(String content, String imgPath, String destPath, boolean needCompress,String random) throws Exception {
        BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
        if(image==null){
            return false;
        }
        mkdirs(destPath);
        String file = random + ".jpg";//生成隨機檔名
        ImageIO.write(image, FORMAT_NAME, new File(destPath + "/" + file));
        return true;
    }

    public static void mkdirs(String destPath) {
        File file = new File(destPath);
        // 當資料夾不存在時，mkdirs會自動建立多層目錄，區別於mkdir。(mkdir如果父目錄不存在則會丟擲異常)
        if (!file.exists() && !file.isDirectory()) {
            file.mkdirs();
        }
    }

    /**
     * 上傳頁面方法
     * @param content
     * @param imgPath
     * @param output
     * @param needCompress
     * @throws Exception
     */
    public static void encode(String content, String imgPath, OutputStream output, boolean needCompress)
            throws Exception {
        BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
        ImageIO.write(image, FORMAT_NAME, output);
    }

    /**
     * 過濾條件
     * @param content
     * @param output
     * @throws Exception
     */
    public static void uploadToWeb(String content, OutputStream output) throws Exception {
        QRCodeUtil.encode(content, null, output, false);
    }


    /**
     * 從二維碼中，解析資料
     * @param file  二維碼圖片檔案
     * @return   返回從二維碼中解析到的資料值
     * @throws Exception
     */
    public static String decode(File file) throws Exception {
        BufferedImage image;
        image = ImageIO.read(file);
        if (image == null) {
            return null;
        }
        BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
        Result result;
        Hashtable hints = new Hashtable();
        hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
        result = new MultiFormatReader().decode(bitmap, hints);
        String resultStr = result.getText();
        return resultStr;
    }

    public static String decode(String path) throws Exception {
        return QRCodeUtil.decode(new File(path));
    }



}
 

在上傳頁面的時候OutPutStream 可以使用response.getoutPutStream()方法獲取

我的頁面二維碼顯示

<img  src="${ctx}/getCord" />

還有一個ImageIo.write關流問題，我不知道他需不需要，有沒有，希望有哪位懂的話能留言指點一下，小弟先謝謝了

下面是output的關流，如果哪位懂的話幫忙看一下，如有問題，希望幫忙指出

try {
          QRCodeUtil.uploadToWeb("https://www.baidu.com/",rep.getOutputStream());
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            rep.getOutputStream().flush();
            rep.getOutputStream().close();
        }
 

查找了很多方法，感覺這個還是可以的，可以根據具體需求更改一下傳參之類的，比較方便

不記得是哪位大佬分享的，希望見到莫怪