Springboot生成二维码整合

Springboot生成二维码整合

我们使用两种方式,去生成二维码,但是其实,二维码的生成基础,都是zxing包,这是Google开源的一个包,第一种是使用原始的zxing方式去实现,第二种是使用hutool来实现,hutool其实也是对于zxing的一个封装,但是封装前后,确实比较简单了。

Zxing原生方式

添加依赖

<!-- zxing生成二维码 -->
<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>

二维码生成工具类

下面是把生成二维码的方法,封装到了QRCodeUtil的类之中,这个方法看起来还是比较多的,但是也谈不上太复杂,主要是对于BufferedImage生成图片,然后就是ImageIO.write()方法,write的位置,可以是普通的磁盘文件,也可以是web的流,我们使用web流的时候,就需要添加com.google.zxing-javase的依赖。

package com.nacl.util;

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 lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import javax.imageio.ImageIO;
import javax.swing.filechooser.FileSystemView;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URL;
import java.util.Date;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;

/**
 * @author HAOYANG
 * @create 2023-07-28 13:46
 */
@Component
@Slf4j
public class QRCodeUtil {
    /**
     * CODE_WIDTH:二维码宽度,单位像素
     * CODE_HEIGHT:二维码高度,单位像素
     * FRONT_COLOR:二维码前景色,0x000000 表示黑色
     * BACKGROUND_COLOR:二维码背景色,0xFFFFFF 表示白色
     * 演示用 16 进制表示,和前端页面 CSS 的取色是一样的,注意前后景颜色应该对比明显,如常见的黑白
     */
    private static final int CODE_WIDTH = 400;
    private static final int CODE_HEIGHT = 400;
    private static final int FRONT_COLOR = 0x000000;
    private static final int BACKGROUND_COLOR = 0xFFFFFF;


    /**
     * @param codeContent        二维码参数内容,如果是一个网页地址,如 https://www.baidu.com/ 则 微信扫一扫会直接进入此地址, 如果是一些参数,如
     *                           1541656080837,则微信扫一扫会直接回显这些参数值
     * @param codeImgFileSaveDir 二维码图片保存的目录,如 D:/codes
     * @param fileName           二维码图片文件名称,带格式,如 123.png
     */
    public static void createCodeToFile(String codeContent, File codeImgFileSaveDir, String fileName) {
        try {
            if (codeContent == null || "".equals(codeContent)) {
                log.info("二维码内容为空,不进行操作...");
                return;
            }
            codeContent = codeContent.trim();
            if (codeImgFileSaveDir == null || codeImgFileSaveDir.isFile()) {
                codeImgFileSaveDir = FileSystemView.getFileSystemView().getHomeDirectory();
                log.info("二维码图片存在目录为空,默认放在桌面...");
            }
            if (!codeImgFileSaveDir.exists()) {
                codeImgFileSaveDir.mkdirs();
                log.info("二维码图片存在目录不存在,开始创建...");
            }
            if (fileName == null || "".equals(fileName)) {
                fileName = new Date().getTime() + ".png";
                log.info("二维码图片文件名为空,随机生成 png 格式图片...");
            }

            BufferedImage bufferedImage = getBufferedImage(codeContent);

            /*
             * javax.imageio.ImageIO:java扩展的图像IO
             * write(RenderedImage im, String formatName, File output)
             *       im:待写入的图像, formatName:图像写入的格式,output:写入的图像文件,文件不存在时会自动创建
             */
            File codeImgFile = new File(codeImgFileSaveDir, fileName);
            ImageIO.write(bufferedImage, "png", codeImgFile);

            log.info("二维码图片生成成功:" + codeImgFile.getPath());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }


    /**
     * 生成二维码并输出到输出流, 通常用于输出到网页上进行显示
     * 输出到网页与输出到磁盘上的文件中,区别在于最后一句 ImageIO.write
     * write(RenderedImage im,String formatName,File output):写到文件中
     * write(RenderedImage im,String formatName,OutputStream output):输出到输出流中
     *
     * @param codeContent  :二维码内容
     * @param outputStream :输出流,比如 HttpServletResponse 的 getOutputStream
     */
    public static void createCodeToOutputStream(String codeContent, OutputStream outputStream) {
        try {
            if (codeContent == null || "".equals(codeContent.trim())) {
                log.info("二维码内容为空,不进行操作...");
                return;
            }
            codeContent = codeContent.trim();

            BufferedImage bufferedImage = getBufferedImage(codeContent);
            /*
             * 区别就是以一句,输出到输出流中,如果第三个参数是 File,则输出到文件中
             */
            ImageIO.write(bufferedImage, "png", outputStream);
            log.info("二维码图片生成到输出流成功...");
        } catch (Exception e) {
            e.printStackTrace();
            log.error("发生错误: {}!", e.getMessage());
        }
    }


    private static BufferedImage getBufferedImage(String codeContent) throws WriterException {
        /*
         * com.google.zxing.EncodeHintType:编码提示类型,枚举类型
         * EncodeHintType.CHARACTER_SET:设置字符编码类型
         * EncodeHintType.ERROR_CORRECTION:设置误差校正
         * ErrorCorrectionLevel:误差校正等级,L = ~7% correction、M = ~15% correction、Q = ~25% correction、H = ~30% correction
         *   不设置时,默认为 L 等级,等级不一样,生成的图案不同,但扫描的结果是一样的
         * EncodeHintType.MARGIN:设置二维码边距,单位像素,值越小,二维码距离四周越近
         */
        Map<EncodeHintType, Object> hints = new HashMap();
        hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
        hints.put(EncodeHintType.MARGIN, 1);

        /*
         * MultiFormatWriter:多格式写入,这是一个工厂类,里面重载了两个 encode 方法,用于写入条形码或二维码
         *      encode(String contents,BarcodeFormat format,int width, int height,Map<EncodeHintType,?> hints)
         *      contents:条形码/二维码内容
         *      format:编码类型,如 条形码,二维码 等
         *      width:码的宽度
         *      height:码的高度
         *      hints:码内容的编码类型
         * BarcodeFormat:枚举该程序包已知的条形码格式,即创建何种码,如 1 维的条形码,2 维的二维码 等
         * BitMatrix:位(比特)矩阵或叫2D矩阵,也就是需要的二维码
         */
        MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
        BitMatrix bitMatrix = multiFormatWriter.encode(codeContent, BarcodeFormat.QR_CODE, CODE_WIDTH, CODE_HEIGHT, hints);

        /*
         * java.awt.image.BufferedImage:具有图像数据的可访问缓冲图像,实现了 RenderedImage 接口
         * BitMatrix 的 get(int x, int y) 获取比特矩阵内容,指定位置有值,则返回true,将其设置为前景色,否则设置为背景色
         * BufferedImage 的 setRGB(int x, int y, int rgb) 方法设置图像像素
         *      x:像素位置的横坐标,即列
         *      y:像素位置的纵坐标,即行
         *      rgb:像素的值,采用 16 进制,如 0xFFFFFF 白色
         */
        BufferedImage bufferedImage = new BufferedImage(CODE_WIDTH, CODE_HEIGHT, BufferedImage.TYPE_INT_BGR);
        for (int x = 0; x < CODE_WIDTH; x++) {
            for (int y = 0; y < CODE_HEIGHT; y++) {
                bufferedImage.setRGB(x, y, bitMatrix.get(x, y) ? FRONT_COLOR : BACKGROUND_COLOR);
            }
        }
        return bufferedImage;
    }


    /**
     * 根据本地二维码图片解析二维码内容 注:图片必须是二维码图片,但也可以是微信用户二维码名片,上面有名称、头像也是可以的)
     *
     * @param file 本地二维码图片文件,如 E:\\logs\\2.jpg
     * @return
     * @throws Exception
     */
    public static String parseQRCodeByFile(File file) {
        String resultStr = null;
        if (file == null || file.isDirectory() || !file.exists()) {
            return resultStr;
        }
        try {
            /*
             * ImageIO的BufferedImage read(URL input)方法用于读取网络图片文件转为内存缓冲图像
             * 同理还有:read(File input)、read(InputStream input)、、read(ImageInputStream stream)
             */
            BufferedImage bufferedImage = ImageIO.read(file);
            /*
             * com.google.zxing.client.j2se.BufferedImageLuminanceSource:缓冲图像亮度源
             * 将 java.awt.image.BufferedImage 转为 zxing 的 缓冲图像亮度源
             * 关键就是下面这几句:HybridBinarizer 用于读取二维码图像数据,BinaryBitmap 二进制位图
             */
            BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(bufferedImage);
            BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
            Hashtable hints = new Hashtable();
            hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");
            /*
             * 如果图片不是二维码图片,则 decode 抛异常:com.google.zxing.NotFoundException
             * MultiFormatWriter 的 encode 用于对内容进行编码成 2D 矩阵
             * MultiFormatReader 的 decode 用于读取二进制位图数据
             */
            Result result = new MultiFormatReader().decode(bitmap, hints);
            resultStr = result.getText();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (NotFoundException e) {
            e.printStackTrace();
            log.error("图片非二维码图片, 路径是: {}!", file.getPath());
        }
        return resultStr;
    }


    /**
     * 根据网络二维码图片解析二维码内容, 区别仅仅在于 ImageIO.read(url); 这一个重载的方法)
     *
     * @param url 二维码图片网络地址,如 https://res.wx.qq.com/mpres/htmledition/images/mp_qrcode3a7b38.gif
     * @return
     * @throws Exception
     */
    public static String parseQRCodeByUrl(URL url) {
        String resultStr = null;
        if (url == null) {
            return resultStr;
        }
        try {
            /*
             * ImageIO 的 BufferedImage read(URL input) 方法用于读取网络图片文件转为内存缓冲图像
             * 同理还有:read(File input)、read(InputStream input)、、read(ImageInputStream stream)
             * 如果图片网络地址错误,比如不能访问,则 read 抛异常:javax.imageio.IIOException: Can't get input stream from URL!
             */
            BufferedImage bufferedImage = ImageIO.read(url);
            /*
             * com.google.zxing.client.j2se.BufferedImageLuminanceSource:缓冲图像亮度源
             * 将 java.awt.image.BufferedImage 转为 zxing 的 缓冲图像亮度源
             * 关键就是下面这几句:HybridBinarizer 用于读取二维码图像数据,BinaryBitmap 二进制位图
             */
            BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(bufferedImage);
            BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
            Hashtable hints = new Hashtable();
            /*
             * 如果内容包含中文,则解码的字符集格式应该和编码时一致
             */
            hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");
            /*
             * 如果图片不是二维码图片,则 decode 抛异常:com.google.zxing.NotFoundException
             * MultiFormatWriter 的 encode 用于对内容进行编码成 2D 矩阵
             * MultiFormatReader 的 decode 用于读取二进制位图数据
             */
            Result result = new MultiFormatReader().decode(bitmap, hints);
            resultStr = result.getText();
        } catch (IOException e) {
            e.printStackTrace();
            log.error("二维码图片地址错误, 地址是: {}!", url);
        } catch (NotFoundException e) {
            e.printStackTrace();
            log.error("图片非二维码图片, 地址是: {}!", url);
        }
        return resultStr;
    }
}

添加Controller

package com.nacl.controller;


import com.nacl.util.QRCodeUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @author HAOYANG
 * @create 2023-07-28 13:50
 */
@RestController
@Slf4j
public class QRCodeController {
    @GetMapping("qrCode")
    public void getQRCode(String codeContent, HttpServletResponse response) {
        System.out.println("codeContent=" + codeContent);
        try {
            /*
             * 调用工具类生成二维码并输出到输出流中
             */
            QRCodeUtil.createCodeToOutputStream(codeContent, response.getOutputStream());
            log.info("成功生成二维码!");
        } catch (IOException e) {
            log.error("发生错误, 错误信息是:{}!", e.getMessage());
        }
    }
}

添加测试页面

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>二维码生成器</title>
    <style type="text/css">
        textarea {
            font-size: 16px;
            width: 300px;
            height: 100px;
        }

        .hint {
            color: red;
            display: none;
        }

        .qrCodeDiv {
            width: 200px;
            height: 200px;
            border: 2px solid sandybrown;
        }

        .qrCodeDiv img {
            max-height: 100%;
            max-width: 100%;
        }
    </style>
    <script src="https://cdn.bootcss.com/jquery/2.1.1/jquery.min.js"></script>

    <script type="text/javascript">
        $(function () {
            $("button").click(function () {
                var codeContent = $("textarea").val();
                console.log(codeContent);
                if (codeContent.trim() == "") {
                    $(".hint").text("二维码内容不能为空").fadeIn(500);
                } else {
                    $(".hint").text("").fadeOut(500);
                    $("#codeImg").attr("src", "/qrCode?codeContent=" + codeContent);
                }
            });
        });
    </script>
</head>
<body>
<textarea placeholder="二维码内容..."></textarea><br>
<button>生成二维码</button>
<span class="hint"></span>
<div class="qrCodeDiv">
    <img src="" id="codeImg">
</div>
</body>
</html>

效果图

扫码后

Hutool的方式

Hutool的是非强制依赖性,因此zxing需要用户自行引入,我们需要加入依赖。使用hutool的时候,com.google.zxing-javase的依赖可以不需要。同时不在需要QRCodeUtil工具类

添加依赖

<dependency>
   <groupId>cn.hutool</groupId>
   <artifactId>hutool-all</artifactId>
   <version>5.3.10</version>
</dependency>
<dependency>
   <groupId>com.google.zxing</groupId>
   <artifactId>core</artifactId>
   <version>3.3.3</version>
</dependency>

创建QRCodeService

QRCodeService其实就是对QrCodeUtil的功能的封装,QrCodeUtil此处的类是hutool工具提供的,和我们在上面与自己与自己提供的QRCodeUtil类,不是同一个,这个需要注意一下。QrCodeUtil的功能此处主要使用到了的是生成二维码,到文件或者流之中,QrConfig是Hutool工具QrCodeUtil的配置类。

package com.nacl.service;

import cn.hutool.core.io.FileUtil;
import cn.hutool.extra.qrcode.QrCodeException;
import cn.hutool.extra.qrcode.QrCodeUtil;
import cn.hutool.extra.qrcode.QrConfig;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpServletResponse;
import java.awt.*;
import java.io.IOException;

/**
 * @author HAOYANG
 * @create 2023-07-28 14:16
 */
@Service
@Slf4j
public class QRCodeService {
    // 自定义参数,这部分是Hutool工具封装的
    private static QrConfig initQrConfig() {
        QrConfig config = new QrConfig(300, 300);
        // 设置边距,既二维码和背景之间的边距
        config.setMargin(3);
        // 设置前景色,既二维码颜色(青色)
        config.setForeColor(Color.CYAN.getRGB());
        // 设置背景色(灰色)
        config.setBackColor(Color.GRAY.getRGB());
        return config;
    }

    /**
     * 生成到文件
     *
     * @param content
     * @param filepath
     */
    public void createQRCode2File(String content, String filepath) {
        try {
            QrCodeUtil.generate(content, initQrConfig(), FileUtil.file(filepath));
            log.info("生成二维码成功, 位置在:{}!", filepath);
        } catch (QrCodeException e) {
            log.error("发生错误!{}!", e.getMessage());
        }
    }

    /**
     * 生成到流
     *
     * @param content
     * @param response
     */
    public void createQRCode2Stream(String content, HttpServletResponse response) {
        try {
            QrCodeUtil.generate(content, initQrConfig(), "png", response.getOutputStream());
            log.info("生成二维码成功!");
        } catch (QrCodeException | IOException e) {
            log.error("发生错误!{}!", e.getMessage());
        }
    }
}

添加Controller

package com.nacl.controller;

import com.nacl.service.QRCodeService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletResponse;

/**
 * @author HAOYANG
 * @create 2023-07-28 14:17
 */
@RestController
@Slf4j
public class QRCodeController {
    @Autowired
    private QRCodeService qrCodeService;

    @GetMapping("qrCode")
    public void getQRCode(String codeContent, HttpServletResponse response) {
        try {
            qrCodeService.createQRCode2Stream(codeContent, response);
            log.info("成功生成二维码!");
        } catch (Exception e) {
            log.error("发生错误, 错误信息是:{}!", e.getMessage());
        }
    }
}

效果图

生成带LOGO的二维码

添加依赖

	<!-- 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.nacl.util;

import com.google.zxing.LuminanceSource;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
/**
 * @author HAOYANG
 * @create 2023-07-28 15:06
 */
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.nacl.util;

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;


/**
 * @author HAOYANG
 * 二维码生成类
 * @create 2023-07-28 14:30
 */
public class QRCodeUtil {

    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
        QRCodeUtil.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 = QRCodeUtil.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 = QRCodeUtil.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

import com.nacl.util.QRCodeUtil;
import org.springframework.boot.test.context.SpringBootTest;

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;
/**
 * @author HAOYANG
 * @create 2023-07-28 15:10
 */
@SpringBootTest
public class TestMain {
    //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 = "C:/Users/HAOYANG/Pictures/Camera Roll/";
    //LOGO本地路径
    private   static String logopath = "C:/Users/HAOYANG/Pictures/Saved Pictures/cs.jpg";

    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(QRCodeUtil.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){

        }
    }
}

效果图

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());
        }
    }

posted on 2023-08-22 20:29  鹏星  阅读(500)  评论(0编辑  收藏  举报

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