这篇文章介绍了Java生成二维码带LOGO，分享给大家做个参考，收藏Java资料网收获更多编程知识

前言

Java后端生成二维码

参考文章

使用Java生成二维码图片(亲测)
Reborn_YY使用Java生成二维码图片
图标素材库
Java后台生成图片，前台实现图片下载

jar

保持和spring同时期版本即可

	<!-- https://mvnrepository.com/artifact/com.google.zxing/core -->
    <!-- 二维码生成工具-->
    <dependency>
          <groupId>com.google.zxing</groupId>
          <artifactId>core</artifactId>
          <version>3.3.3</version>
      </dependency>
      <dependency>
          <groupId>com.google.zxing</groupId>
          <artifactId>javase</artifactId>
          <version>3.3.3</version>
      </dependency>

工具类缓冲图像

 package com.auxgroup.fire.utils;

import com.google.zxing.LuminanceSource;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
public class BufferedImageLuminanceSource extends LuminanceSource {
    private final BufferedImage image;
    private final int left;
    private final int top;

    public BufferedImageLuminanceSource(BufferedImage image) {
        this(image, 0, 0, image.getWidth(), image.getHeight());
    }

    public BufferedImageLuminanceSource(BufferedImage image, int left, int top, int width, int height) {
        super(width, height);
        int sourceWidth = image.getWidth();
        int sourceHeight = image.getHeight();
        if (left + width > sourceWidth || top + height > sourceHeight) {
            throw new IllegalArgumentException("Crop rectangle does not fit within image data.");
        }
        for (int y = top; y < top + height; y++) {
            for (int x = left; x < left + width; x++) {
                if ((image.getRGB(x, y) & 0xFF000000) == 0) {
                    image.setRGB(x, y, 0xFFFFFFFF); // = white
                }
            }
        }
        this.image = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_BYTE_GRAY);
        this.image.getGraphics().drawImage(image, 0, 0, null);
        this.left = left;
        this.top = top;
    }

    @Override
    public byte[] getRow(int y, byte[] row) {
        if (y < 0 || y >= getHeight()) {
            throw new IllegalArgumentException("Requested row is outside the image: " + y);
        }
        int width = getWidth();
        if (row == null || row.length < width) {
            row = new byte[width];
        }
        image.getRaster().getDataElements(left, top + y, width, 1, row);
        return row;
    }

    @Override
    public byte[] getMatrix() {
        int width = getWidth();
        int height = getHeight();
        int area = width * height;
        byte[] matrix = new byte[area];
        image.getRaster().getDataElements(left, top, width, height, matrix);
        return matrix;
    }

    @Override
    public boolean isCropSupported() {
        return true;
    }

    @Override
    public LuminanceSource crop(int left, int top, int width, int height) {
        return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height);
    }

    @Override
    public boolean isRotateSupported() {
        return true;
    }

    @Override
    public LuminanceSource rotateCounterClockwise() {
        int sourceWidth = image.getWidth();
        int sourceHeight = image.getHeight();
        AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0, 0.0, 0.0, sourceWidth);
        BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, BufferedImage.TYPE_BYTE_GRAY);
        Graphics2D g = rotatedImage.createGraphics();
        g.drawImage(image, transform, null);
        g.dispose();
        int width = getWidth();
        return new BufferedImageLuminanceSource(rotatedImage, top, sourceWidth - (left + width), getHeight(), width);
    }
}

工具类设置

 package com.auxgroup.fire.utils;


import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import org.apache.commons.io.output.ByteArrayOutputStream;

import javax.imageio.ImageIO;
import javax.imageio.stream.ImageOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.Hashtable;
import java.util.UUID;

/**
 * 二维码生成类
 *
 * @author 18316
 *
 */
public class QRCodeUtils {
    private static final String CHARSET = "utf-8";
    private static final String FORMAT_NAME = "jpg";
    // 二维码尺寸
    private static final int QRCODE_SIZE = 300;
    // LOGO宽度
    private static final int WIDTH = 100;
    // LOGO高度
    private static final int HEIGHT = 100;

    private static BufferedImage createImage(String content, String imgPath, boolean needCompress) throws Exception {
        Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
        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;
        }
        // 插入图片
        QRCodeUtils.insertImage(image, imgPath, needCompress);
        return image;
    }

    /**
     * 插入LOGO
     *
     * @param source       二维码图片
     * @param imgPath      LOGO图片地址
     * @param needCompress 是否压缩
     * @throws Exception
     */
    private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws Exception {
        File file = new File(imgPath);
        if (!file.exists()) {
            System.err.println("" + imgPath + "   该文件不存在！");
            return;
        }
        Image src = ImageIO.read(new File(imgPath));
        int width = src.getWidth(null);
        int height = src.getHeight(null);
        if (needCompress) { // 压缩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); // 绘制缩小后的图
            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();
    }

    /**
     * 生成二维码(内嵌LOGO) 本地保存
     *
     * @param content      内容
     * @param imgPath      LOGO地址
     * @param destPath     存放目录
     * @param needCompress 是否压缩LOGO
     * @throws Exception
     */
    public static String encode(String content, String imgPath, String destPath, boolean needCompress)
            throws Exception {
        BufferedImage image = QRCodeUtils.createImage(content, imgPath, needCompress);
        mkdirs(destPath);
        // 随机生成二维码图片文件名
        String file = UUID.randomUUID() + ".jpg";
        ImageIO.write(image, FORMAT_NAME, new File(destPath + "/" + file));
        return destPath + file;
    }

    /**
     * 生成二维码(内嵌LOGO)前端IO下载
     * @param content      二维码内容
     * @param imgPath      LOGO地址（本地资源）
     * @param response     响应流
     * @param needCompress 是否压缩LOGO 默认填True
     * @throws Exception
     * @Date   2022/08/08
     * @Author hezhezhiyuLe
     */
    public static void downloadQRImag(String content, String imgPath, HttpServletResponse  response, boolean needCompress)
            throws Exception {
        BufferedImage image = QRCodeUtils.createImage(content, imgPath, needCompress);

        //步骤一：BufferedImage 转 InputStream
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        ImageOutputStream imageOutput = ImageIO.createImageOutputStream(byteArrayOutputStream);
        ImageIO.write(image, "png", imageOutput);
        InputStream inputStream = new ByteArrayInputStream(byteArrayOutputStream.toByteArray());

        //步骤二：获得文件长度
        long length = imageOutput.length();
        try {
            // 文件名
            String fileName = "6S-" +UUID.randomUUID() +".png";
            //设置文件长度
            response.setContentLength((int)length);
            //步骤三：传入文件名、输入流、响应
            fileDownload(fileName,inputStream,response);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
    //文件下载方法，工具类
    public static void fileDownload(String filename, InputStream input, HttpServletResponse response){
        try {
            byte[] buffer = new byte[input.available()];
            input.read(buffer);
            input.close();
            // 清空response
            response.reset();
            // 设置response的Header
            response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes("utf-8"), "ISO-8859-1"));
            OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
            response.setContentType("application/octet-stream");
            toClient.write(buffer);
            toClient.flush();
            //关闭，即下载
            toClient.close();
        }catch (Exception e){
            e.printStackTrace();
        }
    }

    /**
     * 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
     *
     * @author lanyuan Email: mmm333zzz520@163.com
     * @date 2013-12-11 上午10:16:36
     * @param destPath 存放目录
     */
    public static void mkdirs(String destPath) {
        File file = new File(destPath);
        // 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)
        if (!file.exists() && !file.isDirectory()) {
            file.mkdirs();
        }
    }

}

调用

有无LOGO调用

 package com.auxgroup.fire.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.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;

import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;

public class Test {
    //二维码内容
    private  static   String content = "https://www.baidu.com";
    // 二维码保存的路径
    private   static String path = "D:/Test/";
    //LOGO本地路径
    private   static String logopath = "D:/Test/6s1.png";

    public static void main(String[] args) {
        System.out.println("开始生成...");
        QRCode();
        QRCodeLogo();
        System.out.println("生成完毕！");
    }

    /**
     * 生成带有LOGO的二维码
     */
    public static void QRCodeLogo() {
        try {
            System.out.println(QRCodeUtils.encode(content,logopath,path,true));
        } catch (WriterException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }catch (Exception e){

        }
    }

    /**
     * 生成纯二维码
     */
    public static void QRCode() {
        try {
            String codeName = UUID.randomUUID().toString();// 二维码的图片名
            String imageType = "jpg";// 图片类型
            MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
            Map<EncodeHintType, String> hints = new HashMap<EncodeHintType, String>();
            hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
            BitMatrix bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, 400, 400, hints);
            File file1 = new File(path, codeName + "." + imageType);
            MatrixToImageWriter.writeToFile(bitMatrix, imageType, file1);
        } catch (WriterException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }catch (Exception e){

        }
    }
}

图片自己导出看看吧 博客发不了

下载

及时性生成推荐IO流，没必要本地存储

     /**
     * 测试下载
     * @param response
     */
    @ApiOperation("下载二维码")
    @GetMapping("/downloadQRImag")
    public void downloadQRImag(HttpServletResponse response){
        try {
            QRCodeUtils.downloadQRImag("https://www.baidu.com","D:/Test/6s3.png",response,true);
        }catch (Exception e){
            logger.error(e.getMessage());
        }
    }

文章来源:https://www.cnblogs.com/hezhezhiyu/p/16566050.html
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