JAVA实现动态二维码输出

一、控制层

    @GetMapping(value = "/generate")
    @ResponseBody
    public void generateQR(@RequestParam("url")String url, HttpServletResponse response) {
        BufferedImage imageWithLogo;
        response.setHeader("Pragma", "No-cache");
        response.setHeader("Cache-Control", "no-cache");
        response.setDateHeader("Expires", 0);
        response.setContentType("image/jpeg");
        InputStream resourceAsStream = this.getClass().getResourceAsStream("/logo/logo.png");
        imageWithLogo = QRCodeUtil.createImageWithLogo(url, resourceAsStream, true);
        try(ServletOutputStream sos = response.getOutputStream()){
            ImageIO.write(imageWithLogo, "jpeg", sos);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

二、QRCodeUtil

package com.nvxclouds.report.biz.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.common.BitMatrix;
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.IOException;
import java.io.InputStream;
import java.util.Hashtable;

/**
 * @Auther: ShouZhi@Duan
 * @Date: 2021/3/22 15:18
 * @Description:
 */
public class QRCodeUtil {
    private static final String CHARSET = "utf-8";

    // 二维码尺寸
    private static final int QRCODE_SIZE = 300;
    // LOGO宽度
    private static final int LOGO_WIDTH = 80;
    // LOGO高度
    private static final int LOGO_HEIGHT = 80;

    /**
     * 生成不含Logo的二维码
     * @param content 二维码跳转资源
     * @return
     */
    public static BufferedImage createImageNoLogo(String content) {
        Hashtable<EncodeHintType, Object> hints = new Hashtable();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = null;
        try {
            bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);
        } catch (WriterException e) {
            e.printStackTrace();
        }
        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);
            }
        }
        return image;
    }


    /**
     * 生成含Logo的二维码
     * @param content 二维码跳转资源
     * @param logoStream Logo图片资源
     * @param compress Logo是否需要压缩
     * @return
     */
    public static BufferedImage createImageWithLogo(String content, InputStream logoStream, boolean compress) {
        Hashtable<EncodeHintType, Object> hints = new Hashtable();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = null;
        try {
            bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);
        } catch (WriterException e) {
            e.printStackTrace();
        }
        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);
            }
        }
        insertImage(image,logoStream,compress);
        return image;
    }


    /**
     * 插入LOGO
     * @param source       二维码图片
     * @param logoPath     LOGO图片地址
     * @param needCompress 是否压缩
     * @throws Exception
     */
    public static void insertImage(BufferedImage source, InputStream logoPath, boolean needCompress)  {
        Image src = null;
        try {
            src = ImageIO.read(logoPath);
        } catch (IOException e) {
            e.printStackTrace();
        }
        int width = src.getWidth(null);
        int height = src.getHeight(null);
        if (needCompress) {
            // 压缩LOGO
            if (width > LOGO_WIDTH) {
                width = LOGO_WIDTH;
            }
            if (height > LOGO_HEIGHT) {
                height = LOGO_HEIGHT;
            }
            Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
            BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics g = tag.getGraphics();
            // 绘制缩小后的图
            g.drawImage(image, 0, 0, null);
            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, 12, 12);
        graph.setStroke(new BasicStroke(3f));
        graph.draw(shape);
        graph.dispose();
    }
}