上传文件实现

• elementUi el-upload + axios

  自定义上传实现：

  /**
  * 批量上传文件
  * @param {*} param
  */
  export function uploadFile(param, fileInfo) {
      return request({
          method: 'post',
          url: `document/hdfs/up`,
          data: param,
          onUploadProgress: (progressEvent) => {
          let num = progressEvent.loaded / progressEvent.total * 100 | 0;  //百分比
          fileInfo.onProgress({percent: num})     //进度条
          }
      });
  }
  

  <el-upload
  ref="upload"
  action=""
  :http-request="handleCustomUpload"
  :on-preview="handleFilePreview"
  :on-remove="handleFileUploadRemove"
  :on-success="handleFileUploadSuccess"
  :before-upload="handleFileBeforeUpload"
  :file-list="docDialogForm.fileList"
  :multiple="docDialogMode === '批量上传' ? true : false"
  :auto-upload="true"
  >
  

  // 自定义上传
  handleCustomUpload(fileInfo) {
    let file = fileInfo.file;
    this.handleUploadFile(file, fileInfo);
  },
  handleUploadFile(file, fileInfo) {
    // 执行具体上传代码
    let uploadFile = new FormData();
    uploadFile.append('file', file);
    let self = this;
    http.uploadFile(uploadFile, fileInfo)
    .then(res => {
      // 上传成功(打钩的小图标)
      fileInfo.onSuccess();
      if (res.items && (this.docDialogMode === '新增' || this.docDialogMode === '编辑' )) {
        self.docDialogForm.storagePath = res.items[0].storagePath;
        self.docDialogForm.name = res.items[0].name;
        self.docDialogForm.extension = res.items[0].name.slice(res.items[0].name.lastIndexOf('.') + 1);
      }
      if (res.items && this.docDialogMode === '批量上传') {
        self.docDialogForm.batchUploadFileInfo.push({
          name: res.items[0].name,
          storagePath: res.items[0].storagePath,
          extension: res.items[0].name.slice(res.items[0].name.lastIndexOf('.') + 1),
          uid: fileInfo.file.uid
        });
      }
    })
    .catch(() => {
      console.log('文件上传失败');
    })
  }
  

  • 上传文件转成 base64 二进制文件流上传

  function updateFile() {
      var fileInput = document.getElementById("selectFile");
      if(fileInput.files[0] == undefined){
          return;
      }
      var file = fileInput.files[0];
      //FileReader可直接将上传文件转化为二进制流
      var reader = new FileReader();  
      reader.readAsDataURL(file);//转化二进制流，异步方法
      reader.onload = function(){//完成后this.result为二进制流
          var base64Str = this.result;
          var startNum = base64Str.indexOf("base64,");
          startNum = startNum*1 + 7;
          //去除前部格式信息（如果有需求）
          var baseStr = base64Str.slice(startNum);
      }
  }
  

下载实现

• 接口直接返回资源的访问路径

  直接利用 <a> 标签下载

  // 创建下载链接并开始下载
  function createDownloadUrl(Url) {
      const a = document.createElement('a');
      a.style.display = 'none';
      a.download = '测试';
      a.href = Url;
      a.click();
      document.body.removeChild(a);
  }
  

• 接口返回二进制文件流

  • 使用 axios 下载

    下载接口：

    /**
    * 下载文档
    * @param {*} param
    */
    export function downloadFile(documentCode) {
        return request({
            method: 'post',
            url: `document/hdfs/down?documentCode=${documentCode}`,
            responseType: 'blob'
        });
    }
    

    下载具体实现：

    handleRowDownload(scope) {
        // 表格行下载
        http.downloadFile(scope.row.code)
        .then(res => {
            const blob = new Blob([res]);
            // 某些情况下需要明确下载的文件类型
            // const blob = new Blob([res], {type: "application/zip"});
            const a = document.createElement('a');
            a.download = scope.row.name;
            a.href = window.URL.createObjectURL(blob);
            a.click();
        })
        .catch(() => {
            this.$message.error('下载文档失败');
        })
    }