Java 后台生成二维码

使用 Google 的 zxing 在服务端方便的生成二维码

导入依赖

<!-- https://mvnrepository.com/artifact/com.google.zxing/core -->
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.3.3</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.google.zxing/javase -->
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>javase</artifactId>
    <version>3.3.3</version>
</dependency>

编写工具类QRCodeUtil

package com.example.demo;

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 org.springframework.util.StringUtils;

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

/**
 * @author Wenhao Wang
 * @description 二维码生成
 * @date 2020-03-13 11:46
 */
public class QRCodeUtils {

    /**
     * 字符集
     */
    private static final String CHARSET = "utf-8";

    /**
     * 二维码存储格式
     */
    private static final String FORMAT_NAME = "JPG";

    /**
     * 二维码尺寸 像素
     */
    private static final int QR_CODE_SIZE = 300;

    /**
     * 内嵌LOGO高度 像素
     */
    private static final int HEIGHT = 60;

    /**
     * 内嵌LOGO宽度 像素
     */
    private static final int WIDTH = 60;

    /**
     * 生成二维码
     * @param content 二维码内容
     * @param imgPath LOGO路径
     * @param needCompress LOGO是否需要压缩
     * @return
     * @throws WriterException
     * @throws IOException
     */
    private static BufferedImage createImage(String content, String imgPath, boolean needCompress) throws WriterException, IOException {

        // 设置二维码生成属性
        Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
        // 容错率
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        // 字符集
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
        // 二维码边距
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QR_CODE_SIZE, QR_CODE_SIZE, hints);

        // 获取设置完属性的 新的宽和高
        int width = bitMatrix.getWidth();
        int height = bitMatrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        // 设置每个像素点颜色
        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 (StringUtils.isEmpty(imgPath)) {
            return image;
        }
        // 插入LOGO图片
        QRCodeUtils.insertImage(image, imgPath, needCompress);
        return image;
    }

    /**
     * 二维码中间插入LOGO
     *
     * @param source       二维码图片
     * @param imgPath      要插入的图片的路径
     * @param needCompress 是否需要被压缩
     */
    private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws IOException {
        File file = new File(imgPath);
        if (!file.exists()) {
            System.err.println(imgPath + "路径下的文件不存在");
            return;
        }
        Image src = ImageIO.read(file);
        int width = src.getWidth(null);
        int height = src.getHeight(null);

        // 压缩LOGO
        if (needCompress) {
            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();
            // 绘制缩小后的图
            g.drawImage(image, 0, 0, null);
            g.dispose();
            src = image;
        }

        // 插入LOGO
        Graphics2D graphics = source.createGraphics();
        int x = (QR_CODE_SIZE - width) / 2;
        int y = (QR_CODE_SIZE - height) / 2;
        graphics.drawImage(src, x, y, width, height, null);
        Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
        graphics.setStroke(new BasicStroke(3f));
        graphics.draw(shape);
        graphics.dispose();

    }

    /**
     * 生成二维码
     *
     * @param content      二维码内容
     * @param imgPath      LOGO路径
     * @param destPath     生成二维码存放路径
     * @param needCompress 是否需要压缩LOGO
     * @return
     * @throws IOException
     * @throws WriterException
     */
    public static String encode(String content, String imgPath, String destPath, boolean needCompress) throws IOException, WriterException {
        BufferedImage image = QRCodeUtils.createImage(content, imgPath, needCompress);
        mkdirs(destPath);
        String fileName = UUID.randomUUID().toString().replace("-","").toUpperCase() + ".jpg";
        ImageIO.write(image, FORMAT_NAME, new File(destPath + "/" + fileName));
        return fileName;
    }

    public static boolean mkdirs(String destPath) {
        File file = new File(destPath);
        // 递归创建文件目录
        if (!file.exists() && !file.isDirectory()) {
            return file.mkdirs();
        }
        return true;
    }

    /**
     * 生成二维码(内嵌LOGO)
     *
     * @param content  内容
     * @param imgPath  LOGO地址
     * @param destPath 存储地址
     * @throws Exception
     */
    public static void encode(String content, String imgPath, String destPath)
            throws Exception {
        QRCodeUtils.encode(content, imgPath, destPath, false);
    }

    /**
     * 生成二维码
     *
     * @param content      内容
     * @param destPath     存储地址
     * @param needCompress 是否压缩LOGO
     * @throws Exception
     */
    public static void encode(String content, String destPath,
                              boolean needCompress) throws Exception {
        QRCodeUtils.encode(content, null, destPath, needCompress);
    }

    /**
     * 生成二维码
     *
     * @param content  内容
     * @param destPath 存储地址
     * @throws Exception
     */
    public static void encode(String content, String destPath) throws Exception {
        QRCodeUtils.encode(content, null, destPath, false);
    }

    /**
     * 生成二维码(内嵌LOGO)
     *
     * @param content      内容
     * @param imgPath      LOGO地址
     * @param output       输出流
     * @param needCompress 是否压缩LOGO
     * @throws Exception
     */
    public static void encode(String content, String imgPath,
                              OutputStream output, boolean needCompress) throws Exception {
        BufferedImage image = QRCodeUtils.createImage(content, imgPath,
                needCompress);
        ImageIO.write(image, FORMAT_NAME, output);
    }

    /**
     * 生成二维码
     *
     * @param content 内容
     * @param output  输出流
     * @throws Exception
     */
    public static void encode(String content, OutputStream output)
            throws Exception {
        QRCodeUtils.encode(content, null, output, false);
    }

    /**
     * 解析二维码内容
     *
     * @param file 二维码
     * @return
     * @throws IOException
     * @throws NotFoundException
     */
    public static String decode(File file) throws IOException, NotFoundException {
        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<DecodeHintType, Object> hints = new Hashtable<>();
        hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
        result = new MultiFormatReader().decode(bitmap, hints);
        return result.getText();
    }

    /**
     * 解析二维码
     *
     * @param path 二维码图片地址
     * @return
     * @throws Exception
     */
    public static String decode(String path) throws Exception {
        return QRCodeUtils.decode(new File(path));
    }

    public static void main(String[] args) throws Exception {
        //这里设置二维码内容
        String text = "https://www.baidu.com";
        
        // LOGO路径
        String logoPath = "D:\\test\\1.png";
        
        // 二维码存放路径
        String destPath = "D:\\test";
        System.out.println(QRCodeUtils.encode(text, logoPath, destPath, true));
        System.out.println(QRCodeUtils.decode("D:\\test\\C6C5E626999E4997870E6E5D0A729729.jpg"));
    }
}

清平乐·雨晴烟晚

黄昏独倚朱阑，西南新月眉弯。

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