Base64通用上传方式

    <el-upload
        class="avatar-uploader"
        ref="uploadRef"
        :auto-upload="false"
        :show-file-list="false"
        :on-change="onchange"
>
        <img v-if="form.img" :src="form.img" class="avatar" />
        <el-icon v-else class="avatar-uploader-icon"><Plus /></el-icon>
    </el-upload>

import type { UploadInstance } from "element-plus";

const uploadRef = ref();

const form = reactive({

  img: "",

  imgName: "",
});const onchange = (file: any, fileList: any) => {
  var reader = new FileReader();
  reader.readAsDataURL(file.raw);
  reader.onload = () => {
    form.img = reader.result;
    form.imgName = file.raw.name;
  };
};

<style scoped>
.avatar-uploader .avatar {
  width: 80px;
  height: 80px;
  display: block;
}
</style>

<style>
.avatar-uploader .el-upload {
  border: 1px dashed var(--el-border-color);
  border-radius: 6px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: var(--el-transition-duration-fast);
}

.avatar-uploader .el-upload:hover {
  border-color: var(--el-color-primary);
}

.el-icon.avatar-uploader-icon {
  font-size: 28px;
  color: #8c939d;
  width: 80px;
  height: 80px;
  text-align: center;
}
</style>

String[] dataArray = StrUtil.splitToArray(categoryDto.getImg(), "base64,");
 byte[] bytes = Base64.decode(dataArray[1]);
 String imgName = System.currentTimeMillis() + "_" + categoryDto.getImgName();
 FileUtil.writeBytes(bytes, "D:/software/nginx-1.23.0/html/images/" + imgName);
 String img = StrUtil.format("http://img.beimao.com/images/{}", imgName);