文件处理

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返回图片思路 1

Spring MVC: How to return image in @ResponseBody? - Stack Overflow

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@ResponseBody
@RequestMapping(value = "/photo2", method = RequestMethod.GET, produces = MediaType.IMAGE_JPEG_VALUE)
public byte[] testphoto() throws IOException {
    InputStream in = servletContext.getResourceAsStream("/images/no_image.jpg");
    return IOUtils.toByteArray(in);
}
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// JavaScript
export function getcaptcha(params) {
  return request({
    url: '/api/user/getcaptcha',
    method: 'get',
    responseType: 'blob',
    params,
  });
}

返回图片思路 2

将图片作为 base64 字符串返回，前端渲染 base64 即可。

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// 引入 hutool 的验证码功能
@Override
public String getCaptcha(String captchaKey) {
    LineCaptcha lineCaptcha = CaptchaUtil.createLineCaptcha(160, 80);
    String captchaCode = lineCaptcha.getCode();
    codeCache.set(captchaKey, captchaCode, Duration.ofMinutes(5).getSeconds());
    return lineCaptcha.getImageBase64Data();
}

spring 异步处理上传的文件时，自动删除问题