Hutool生成圖片二維碼 輸出到前端

文檔地址

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>

考慮到Hutool的非強制依賴性，因此zxing需要用戶自行引入
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.3.3</version>
</dependency>

編譯需要
<build>
    <resources>
        <resource>
            <directory>src/main/resources</directory>
            <includes>
                <include>**/*</include>
            </includes>
        </resource>
    </resources>
</build>

後端代碼

 /**
     * 生成二維碼
     * @param content 內容
     * @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();
        }
        //附帶logo
        config.setImg(file);
        // 設置邊距，既二維碼和背景之間的邊距
        config.setMargin(3);
        // 高糾錯級別
        config.setErrorCorrection(ErrorCorrectionLevel.H);
        // 設置前景色，既二維碼顏色（青色）
        config.setForeColor(new Color(0,60,130).getRGB());
// 設置背景色（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, //二維碼內容
                config
        );
        try {
            //以JPEG格式向客戶端發送
            ServletOutputStream  os = response.getOutputStream();
            ImageIO.write(bufferedImage, "PNG",os);
            os.flush();
            os.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

controller

 

 

postman測試

 如果打成jar需要這樣讀取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");