Element UI 实现Upload多文件上传 （只请求一次接口）

**

页面代码：

**

   <el-upload
          :auto-upload="false"
          multiple
          class="upload-demo"
          action="#"
          :on-change="uploadChange"
          :before-remove="beforeRemove"
          :on-remove="upLoadRemove"
          :on-preview="downLoadFile"
          :file-list="fileList"
        >
          <el-button size="small" icon="el-icon-plus" slot="trigger"
            >选取文件</el-button
          >
          <el-button
            style="margin-left: 10px"
            size="small"
            icon="el-icon-upload"
            type="success"
            @click="submitUpload"
            :disabled="fileList.length <= 0"
            >上传到服务器</el-button
          >
        </el-upload>

**

API用到的方法

**

 // 拖拽上传
    beforeRemove(file, fileList) {
    
    
      this.fileList = fileList;
      // return this.$confirm(`确定移除 ${file.name}？`);
    },
    // 移除附件
    upLoadRemove(file, fileList) {
    
    
      let tempFileList = [];
      for (var index = 0; index < this.fileList.length; index++) {
    
    
        if (this.fileList[index].name !== file.name) {
    
    
          tempFileList.push(this.fileList[index]);
        }
      }
      this.fileList = tempFileList;
    },
    // 监控上传文件列表
    uploadChange(file, fileList) {
    
    
      let existFile = fileList
        .slice(0, fileList.length - 1)
        .find((f) => f.name === file.name);
      if (existFile) {
    
    
        this.$message.error("当前文件已经存在!");
        fileList.pop();
      }
      this.fileList = fileList;
    },
    // 上传到服务器  formidable接收
    async submitUpload() {
    
    
      // 上传文件大小不能超过100MB!
      const isLt100M = this.fileList.every(
        (file) => file.size / 1024 / 1024 < 100
      );
      let formData = new FormData();
      this.fileList.forEach((item) => {
    
    
        formData.append("files", item.raw);
      });
      formData.append("parentId", this.mapValue);
      // append追加后console.log后仍为空,需要用formData.get("键")的方法获取值
      const res = await fileUpload(formData);
      console.log(res);
    },
    // 点击文件进行下载
    downLoadFile(file) {
    
    
      var a = document.createElement("a");
      var event = new MouseEvent("click");
      a.download = file.name;
      a.href = file.url;
      a.dispatchEvent(event);
    },
    //  :on-exceed="handleExceed"
    // 选取文件超过数量提示
    // handleExceed(files, fileList) {
    
    
    //   this.$message.warning(`当前限制选择 5 个文件，本次选择了 ${files.length} 个文件，共选择了 ${files.length + fileList.length} 个文件`);
    // },

注： 页面上用到的请求 是封装好的 from-data 表单提交后台

效果图展示：

请求参数展示：

后端代码springboot代码展示：

@RequestMapping(value = "/upload", method = RequestMethod.POST)
public Results upload(@RequestParam("files") MultipartFile[] files) throws Exception {
    
    

    SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
    String date = sdf.format(new Date());
    String fileName = null;
    String filePath = null;

    List<File> fileList = new ArrayList<>();
    File tmp = null;
    for(MultipartFile file : files){
    
    
        fileName = file.getOriginalFilename();

        InputStream fileIo = file.getInputStream();
        String fileType = fileName.substring(fileName.lastIndexOf(".") + 1);

        //保存到minio
        String minioName = UUID.randomUUID().toString().replace("-", "");
        filePath = "/"+date+"/" + minioName + "." + fileType;

        //udt是桶的名字
//            minioTemplate.saveObject(MinioTemplate.MINIO_BUCKET, filePath, fileIo, file.getContentType());

        tmp = new File();
        tmp.setFileName(fileName);
        tmp.setFilePath("/" + MinioTemplate.MINIO_BUCKET + filePath);
        tmp.setFileSize(String.valueOf(file.getSize()));
        tmp.setMimeType(file.getContentType());
        fileList.add(tmp);
    }

    return Results.ok("文件上传成功").put("fileList", fileList);
}