SpringBoot实现二维码生成

介绍

  • 字符串封装成二维码,扫码就可以获取字符串内容。
  • 网址封装成二维码,扫码就可以跳转到对应网页。

快速开始

导入依赖

 
 
     com.google.zxing
     javase
     3.3.0
 

二维码生成工具类

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.InputStream;
import java.io.OutputStream;
import java.util.Hashtable;

/**
 * 二维码生成工具类
 */
public class QrCodeUtils {

    private static final String CHARSET = "utf-8";
    public static final String FORMAT = "JPG";
    // 二维码尺寸
    private static final int QRCODE_SIZE = 300;
    // LOGO宽度
    private static final int LOGO_WIDTH = 60;
    // LOGO高度
    private static final int LOGO_HEIGHT = 60;

    /**
     * 生成二维码
     *
     * @param content      二维码内容
     * @param logoPath     logo地址
     * @param needCompress 是否压缩logo
     * @return 图片
     */
    public static BufferedImage createImage(String content, String logoPath, 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 (logoPath == null || "".equals(logoPath)) {
            return image;
        }
        // 插入图片
        QrCodeUtils.insertImage(image, logoPath, needCompress);
        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
     */
    private static void insertImage(BufferedImage source, String logoPath,
                                    boolean needCompress) throws Exception {
        File file = new File(logoPath);
        if (!file.exists()) {
            System.err.println(""+logoPath+"   该文件不存在!");
            return;
        }
        Image src = ImageIO.read(new File(logoPath));
        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();
            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(指定路径保存)
     *
     * @param content 内容
     * @param imgPath logo图片地址(内嵌图片)
     * @param destPath 生成二维码存放地址
     * @param needCompress 是否压缩logo
     */
    public static void encode(String content, String imgPath, String destPath, boolean needCompress) throws Exception {
        BufferedImage image = QrCodeUtils.createImage(content, imgPath, needCompress);
        mkdirs(destPath);
        ImageIO.write(image, FORMAT, new File(destPath));
    }

    /**
     * 生成二维码(直接将二维码以图片输出流返回)
     *
     * @param content 内容
     * @param imgPath logo图片地址(内嵌图片)
     * @param needCompress 是否压缩logo
     * @return 二维码图片
     */
    public static BufferedImage encode(String content, String imgPath, boolean needCompress) throws Exception {
        return QrCodeUtils.createImage(content, imgPath, needCompress);
    }

    /**
     * 创建多级文件
     * 
     * @param destPath 目标目录
     */
    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();
        }
    }
    
    /**
     * 生成二维码(内嵌LOGO)
     *
     * @param content      内容
     * @param logoPath     LOGO地址
     * @param output       输出流
     * @param needCompress 是否压缩LOGO
     */
    public static void encode(String content, String logoPath, OutputStream output, boolean needCompress)
            throws Exception {
        BufferedImage image = QrCodeUtils.createImage(content, logoPath, needCompress);
        ImageIO.write(image, FORMAT, output);
    }
    
    /**
     * 获取指定文件的输入流,获取logo
     *
     * @param logoPath 文件的路径
     * @return 输入流
     */
    public static InputStream getResourceAsStream(String logoPath) {
        return QrCodeUtils.class.getResourceAsStream(logoPath);
    }

    /**
     * 解析二维码
     *
     * @param file 二维码图片
     * @return 解析结果
     */
    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);
        return result.getText();
    }

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

controller层

  • context:二维码里面的内容,如果字符串是网址,被扫描后则会跳转到对应网页
  • destPath:生成二维码图片的保存路径
  • logoPath:logo图片的路径
@ApiOperation(value = "获取二维码")
GetMapping("/qrCode")
public void qrCodeTest(HttpServletResponse response) throws Exception {
    // context是二维码里面的内容,如果是网址则会跳转到网址界面
    String context = "lixianhe";
    // 获取类路径下的logo文件
    ClassPathResource resource = new ClassPathResource("static/logo.jpg");
    //获logo.jpg的绝对路径
    String logoPath = resource.getFile().getPath();
    // String destPath = "D:\\qrCode\\csdn.jpg";
    QrCodeUtils.encode(context, logoPath, response.getOutputStream(), true);
}

logo.jpg是二维码的logo图片可以作为二维码的中心部分,该图片放在resources文件夹下。

SpringBoot实现二维码生成_第1张图片

获取resources文件下的内容

ClassPathResource resource = new ClassPathResource("static/logo.jpg");
//获logo.jpg的绝对路径(在target文件夹下)
String logoPath = resource.getFile().getPath();
// 输出logo.jpg文件的绝对路径
System.out.println(logoPath);

控制台输出

C:\Users\86131\Desktop\xxx\ManyDataSource\ManyDataSource\target\classes\static\logo.jpg

测试功能

访问接口,生成的二维码是以logo.jpg为中心的

SpringBoot实现二维码生成_第2张图片

扫码:可以查看到字符串 "lixianhe"

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