google-api-javascript-client ：如何使用 Drive API 获取文件内容？

首先，如果有一个问题/答案已经解决了我的问题，那么我真诚地为创建一个新问题而道歉。然而我已经找了3天了，还是没有找到答案……

我的问题是，我一生都无法弄清楚如何提取文件（任何文件）的内容。通过阅读文档，我发现我返回的文件资源对象应该有一个名为“downloadUrl”的属性，并且从中我应该能够访问文件内容。

返回给我的文件资源对象（通过gapi.client.request）都没有这个字段/属性。下面是我用来获取文件的函数。 有人可以帮我指出正确的方向吗？我必须在周一之前完成这个演示，我已经在这个问题上坚持了两天了……

这是我的 get 函数的代码：

Client.getFileContent = function getFileContent() {
     gapi.client.load('drive', 'v2', function() {
          var request = gapi.client.request({
               path : '/drive/v2/files/1QmaofXyVqnw6ODXHE5KWlUTcWbA9KkLyb-lBdh_FLUs',
               method : 'GET',
               params : {
                    projection: "FULL"
               }
          });
          request.execute(function(response) {
               console.log(response);   
          });
     });
};

返回给我的文件资源对象没有 downloadUrl 属性。

根据要求，这是我为文本文件返回的响应对象。请注意，我将一些 id 替换为“fileid”以便在此处发布。

"kind": "drive#file",
   "id": "fileID",
   "etag": "\"-tJAWr_lbRQU2o8gZ0X7BCBIlVk/MTM0MjYyODQ1MTQ2Nw\"",
   "selfLink": "https://www.googleapis.com/drive/v2/files/fileID",
   "alternateLink": "https://docs.google.com/document/d/fileID/edit",
   "embedLink": "https://docs.google.com/document/d/fileID/preview",
   "thumbnailLink": "https://docs.google.com/feeds/vt?gd=true&id=fileID&v=1&s=AMedNnoAAAAAUAfLhbYIDsNIn40k7DfRYBsrquijmCii&sz=s220",
   "permissionsLink": "https://www.googleapis.com/drive/v2/files/fileID/permissions",
   "title": "Copied filed.txt",
   "mimeType": "application/vnd.google-apps.document",
   "labels": {
    "starred": false,
    "hidden": false,
    "trashed": false,
    "restricted": false,
    "viewed": true
   },
   "createdDate": "2012-07-18T16:20:51.132Z",
   "modifiedDate": "2012-07-18T16:20:51.467Z",
   "modifiedByMeDate": "2012-07-18T16:20:51.467Z",
   "lastViewedByMeDate": "2012-07-18T16:20:51.467Z",
   "parents": [
    {
     "kind": "drive#parentReference",
     "id": "0AAAYYkwdgVqHUk9PVA",
     "selfLink": "https://www.googleapis.com/drive/v2/files/fileID/parents/0AAAYYkwdgVqHUk9PVA",
     "parentLink": "https://www.googleapis.com/drive/v2/files/0AAAYYkwdgVqHUk9PVA",
     "isRoot": true
    }
   ],
   "exportLinks": {
    "application/vnd.oasis.opendocument.text": "https://docs.google.com/feeds/download/documents/export/Export?id=fileID&exportFormat=odt",
    "application/msword": "https://docs.google.com/feeds/download/documents/export/Export?id=fileID&exportFormat=doc",
    "text/html": "https://docs.google.com/feeds/download/documents/export/Export?id=fileID&exportFormat=html",
    "application/rtf": "https://docs.google.com/feeds/download/documents/export/Export?id=fileID&exportFormat=rtf",
    "text/plain": "https://docs.google.com/feeds/download/documents/export/Export?id=fileID&exportFormat=txt",
    "application/pdf": "https://docs.google.com/feeds/download/documents/export/Export?id=fileID&exportFormat=pdf"
   },
   "userPermission": {
    "kind": "drive#permission",
    "etag": "\"-tJAWr_lbRQU2o8gZ0X7BCBIlVk/9STkNeCmz61YXorH3hoJimnEgfM\"",
    "id": "current",
    "role": "owner",
    "type": "user"
   },
   "quotaBytesUsed": "0",
   "ownerNames": [
    "Joshua.morine"
   ],
   "lastModifyingUserName": "Joshua.morine",
   "editable": true,
   "writersCanShare": true
  }

对于原生 Google 文档（Google 电子表格、演示文稿等），我们不提供 downloadUrl，因为这些文档无法真正以其原生格式作为文件下载。相反，您必须使用列表中的 URL 之一导出链接它提供了下载几种不同导出格式的 Google 文档的 URL。

对于您的情况，可以使用以下 Google 文档：

"exportLinks": {
    "application/vnd.oasis.opendocument.text": "https://docs.google.com/feeds/download/documents/export/Export?id=fileID&exportFormat=odt",
    "application/msword": "https://docs.google.com/feeds/download/documents/export/Export?id=fileID&exportFormat=doc",
    "text/html": "https://docs.google.com/feeds/download/documents/export/Export?id=fileID&exportFormat=html",
    "application/rtf": "https://docs.google.com/feeds/download/documents/export/Export?id=fileID&exportFormat=rtf",
    "text/plain": "https://docs.google.com/feeds/download/documents/export/Export?id=fileID&exportFormat=txt",
    "application/pdf": "https://docs.google.com/feeds/download/documents/export/Export?id=fileID&exportFormat=pdf"
   }