Hutool生成图片二维码输出到前端

清疚 2023-06-22 13:45 11阅读 0赞

文档地址

[https://hutool.cn/docs/\#/extra/%E4%BA%8C%E7%BB%B4%E7%A0%81%E5%B7%A5%E5%85%B7-QrCodeUtil][https_hutool.cn_docs_extra_E4_BA_8C_E7_BB_B4_E7_A0_81_E5_B7_A5_E5_85_B7-QrCodeUtil]

pom引入

hutool jar
    <dependency>
        <groupId>cn.hutool</groupId>
        <artifactId>hutool-all</artifactId>
        <version>5.0.7</version>
    </dependency>
    
    考虑到Hutool的非强制依赖性，因此zxing需要用户自行引入
    <dependency>
        <groupId>com.google.zxing</groupId>
        <artifactId>core</artifactId>
        <version>3.3.3</version>
    </dependency>
    
    编译需要
    <build>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*</include>
                </includes>
            </resource>
        </resources>
    </build>

后端代码

/**
         * 生成二维码
         * @param content 内容
         * @param logourl  logo
         */
        public void createQrCodeN(String content, String logourl, int width, int height,HttpServletResponse response){
            QrConfig config = new QrConfig(width, height);
            File file = null;
            try {
                file = ResourceUtils.getFile(logourl);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
            //附带logo
            config.setImg(file);
            // 设置边距，既二维码和背景之间的边距
            config.setMargin(3);
            // 高纠错级别
            config.setErrorCorrection(ErrorCorrectionLevel.H);
            // 设置前景色，既二维码颜色（青色）
            config.setForeColor(new Color(0,60,130).getRGB());
    // 设置背景色（灰色）
            config.setBackColor(new Color(242,242,242).getRGB());
           /* try {
                OutputStream  out = new FileOutputStream("");
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }*/
    
            BufferedImage bufferedImage = QrCodeUtil.generate(//
                    content, //二维码内容
                    config
            );
            try {
                //以JPEG格式向客户端发送
                ServletOutputStream  os = response.getOutputStream();
                ImageIO.write(bufferedImage, "PNG",os);
                os.flush();
                os.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
    
        }

controller

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5MzEzNTk2_size_16_color_FFFFFF_t_70][]

postman测试

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5MzEzNTk2_size_16_color_FFFFFF_t_70 1][]

如果打成jar需要这样读取file

InputStream initialStream = Thread.currentThread().getContextClassLoader().getResourceAsStream(logourl);
    byte[] buffer = new byte[initialStream.available()];
    initialStream.read(buffer);
    File file = new File("src/main/resources/targetFile.tmp");

[https_hutool.cn_docs_extra_E4_BA_8C_E7_BB_B4_E7_A0_81_E5_B7_A5_E5_85_B7-QrCodeUtil]: https://hutool.cn/docs/#/extra/%E4%BA%8C%E7%BB%B4%E7%A0%81%E5%B7%A5%E5%85%B7-QrCodeUtil
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5MzEzNTk2_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20191216155139178.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5MzEzNTk2,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5MzEzNTk2_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/2019121615524655.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5MzEzNTk2,size_16,color_FFFFFF,t_70