首次使用才了不少坑

效果

本来是不想直接用action上传到后端的，想用http-request="uploadFileRequest"上传，但是在 uploadFileRequest方法中参数File获取不到文件流，file.file和file.raw都不行，就还是用action直接提交上传吧

file参数的值：

直接贴代码看吧

<el-upload
    class="avatar-uploader"
    limit="1"   //最大允许上传个数
    //:http-request="uploadFileRequest"
    :action="uploadUrl"
    :show-file-list="false"
    :on-success="handleAvatarSuccess"
    :before-upload="beforeAvatarUpload">
  <img v-if="imageUrl" :src="imageUrl" class="avatar">
  <i v-else class="el-icon-plus avatar-uploader-icon"></i>
</el-upload>


<script>
export default {
  name: "addArticle",
  setup() {
    const imageUrl = ref("");
    const editor = ref(null);
    const $systemUrl = getCurrentInstance()?.appContext.config.globalProperties.$systemUrl;
    const uploadUrl = ref($systemUrl + "/uploadFile");
    const handleAvatarSuccess = (res, file) => {
      console.log(res)
      if(res.success == true){
        ElMessage.success(res.msg);
        imageUrl.value = URL.createObjectURL(file.raw);
      }else{
        ElMessage.error(res.msg);
      }
    }
    const uploadFileRequest = (file) => {
    //本来是搭配:http-request="uploadFileRequest" 使用 但是获取不到文件file 故作罢
      var fd = new FormData() //构造一个 FormData，把后台需要发送的参数都添加进去
      fd.append('file', file.file) //传文件
      console.log(fd)
      uploadFile(fd).then((res) => {
        console.log("2"+res)
        imageUrl.value = res;
      });
    }
    const beforeAvatarUpload = (file) => {
      const isJPG = file.type === 'image/jpeg';
      const isLt2M = file.size / 1024 / 1024 < 2;

      if (!isJPG) {
        ElMessage.error('上传头像图片只能是 JPG 格式!');
      }
      if (!isLt2M) {
        ElMessage.error('上传头像图片大小不能超过 2MB!');
      }
      return isJPG && isLt2M;
    }

    return {
      handleAvatarSuccess,
      beforeAvatarUpload,
      imageUrl,
      uploadFileRequest,
      uploadUrl
    };
  },
};
</script>

后端controller代码

 @RequestMapping("/uploadFile")
    public Result uploadFile(HttpServletRequest request, MultipartFile file){

        return fileUploadService.uploadFile(request, file);

    }