java Spring Boot生成图片二维码

-耿瑞-2023-09-20 12:25

首先我们要引入依赖

pom.xml中插入

xml 复制代码

<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.4.1</version>
</dependency>
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>javase</artifactId>
    <version>3.4.1</version>
</dependency>

然后直接在接口类中写入函数

java 复制代码

@GetMapping(value = "/qrcode/{text}")
public void generateQRCode(@PathVariable("text") String text, HttpServletResponse response) throws IOException, WriterException {
    response.setContentType(MediaType.IMAGE_PNG_VALUE);
    OutputStream outputStream = response.getOutputStream();

    Map<EncodeHintType, Object> hints = new HashMap<>();
    hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");

    BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, 200, 200, hints);
    MatrixToImageWriter.writeToStream(bitMatrix, "PNG", outputStream);

    outputStream.flush();
    outputStream.close();
}

然后直接访问端口+前缀配置/qrcode/要生成的二维码文本内容

例如这里我访问

http://localhost/books/qrcode/1992

然后接口就会返回一个二维码给我们这里因为CSDN平台不支持禁止二维码图片我就用画笔破获一下免得被和谐了

然后用手机扫描二维码

就可以带出我们文本的内容