之前我有一套Google Drive API代码，可以在以下场景正常运行

1. 将新文件保存到 appdata
2. 更新应用数据中的先前文件
3. 将新文件保存到非应用数据
4. 更新非应用数据中的先前文件

几天前，我遇到场景 2 不再工作(更新 appdata 中的先前文件)，而其他场景仍然可以正常工作。我将收到以下异常。

com.google.api.client.googleapis.json.GoogleJsonResponseException: 500 Internal Server Error
{
  "code": 500,
  "errors": [
    {
      "domain": "global",
      "message": "Internal Error",
      "reason": "internalError"
    }
  ],
  "message": "Internal Error"
}
    at com.google.api.client.googleapis.json.GoogleJsonResponseException.from(GoogleJsonResponseException.java:145)
    at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:113)
    at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:40)
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:423)
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:343)
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:460)
    at org.yccheok.jstock.gui.Utils.updateFile(Utils.java:1414)

我正在使用 DRIVE 和 DRIVE_APPDATA 范围 - authorizeDrive()

代码如下

• saveToGoogleDrive() - Save or update file in appdata , 在更新文件期间不起作用。在保存新文件的过程中工作。
• saveToLegacyGoogleDrive() - Save or update file in non-appdata , 一切正常!

在第 1414 行抛出异常，这是

com.google.api.services.drive.model.File updatedFile = service.files().update(fileId, file, mediaContent).setNewRevision(false).execute();

使用查询 title contains 'jstock-fe78440e-e0fe-4efb' and trashed = false and 'appdata' in parents 在 appdata 中搜索上一个文件完全没问题。我们能够毫无问题地检索以前的文件 ID。

但是，当我们使用检索到的文件 ID 执行文件更新时，将抛出 500 Internal Server Error。

一些用户在 appdata 中搜索时遇到问题(我不是这种情况)。 Search folder inside 'appdata' folder建议的解决方法是添加 drive.readonly.metadata。我曾尝试过一次，但没有任何区别。

更新

Jon Skeet 提出的出色解决方法

I've managed to reproduce the issue. Without setNewRevision(false) it works - I realize that may not be feasible in all cases, but is it a reasonable workaround for you for the moment?

但是，目前我将暂停此类解决方法。我们更喜欢setNewRevision(false)，以防止增加用户数据存储配额的使用 - http://developers.google.com/drive/v2/reference/files/update

演示问题的简短但完整的源代码

1. 创建客户端 ID 和 key 。更新源代码。
2. 创建一个document.txt
3. 第一次运行源代码，上传document.txt到appdata文件夹。它应该成功。通过在线 Google 云端硬盘检查您上传的文件。 (见附件)
4. 第二次运行源代码，对appdata文件夹中之前的document.txt进行更新。应抛出 500 Internal Server Error 异常。

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

package insert;

import com.google.api.client.auth.oauth2.Credential;
import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeFlow;
import com.google.api.client.googleapis.auth.oauth2.GoogleCredential;
import com.google.api.client.googleapis.auth.oauth2.GoogleTokenResponse;
import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport;
import com.google.api.client.http.FileContent;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.json.gson.GsonFactory;
import com.google.api.services.drive.Drive;
import com.google.api.services.drive.DriveScopes;
import com.google.api.services.drive.model.FileList;
import com.google.api.services.drive.model.ParentReference;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.security.GeneralSecurityException;
import java.util.Arrays;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;


public class Insert {

    private static com.google.api.services.drive.model.File searchFromGoogleDrive(Drive drive, String qString) {
        try {
            Drive.Files.List request = drive.files().list().setQ(qString);

            do {                
                FileList fileList = request.execute();

                com.google.api.services.drive.model.File file = null;

                for (com.google.api.services.drive.model.File f : fileList.getItems()) {

                    final String title = f.getTitle();

                    if (title == null || f.getDownloadUrl() == null || f.getDownloadUrl().length() <= 0) {
                        continue;
                    }

                    file = f;

                    break;
                }

                if (file != null) {
                    return file;
                }

                request.setPageToken(fileList.getNextPageToken());
            } while (request.getPageToken() != null && request.getPageToken().length() > 0);
        } catch (IOException ex) {
            log.error(null, ex);
            return null;
        }
        return null;
    }

    public static boolean saveToGoogleDrive(Credential credential, java.io.File file) {
        final String titleName = "document.txt";
        final String qString = "title contains '" + titleName + "' and trashed = false and 'appdata' in parents";        
        return _saveToGoogleDrive(credential, file, qString, "appdata");
    }

    public static Drive getDrive(Credential credential) {
        Drive service = new Drive.Builder(httpTransport, JSON_FACTORY, credential).setApplicationName("JStock").build();
        return service;
    }

    private static boolean _saveToGoogleDrive(Credential credential, java.io.File file, String qString, String folder) {
        Drive drive = getDrive(credential);

        // Should we new or replace?

        com.google.api.services.drive.model.File googleCloudFile = searchFromGoogleDrive(drive, qString);

        final String title = "document.txt";

        if (googleCloudFile == null) {
            String id = null;
            if (folder != null) {
                com.google.api.services.drive.model.File appData;
                try {
                    appData = drive.files().get(folder).execute();
                    id = appData.getId();
                } catch (IOException ex) {
                    log.error(null, ex);
                    return false;
                }
            }
            return null != insertFile(drive, title, id, file);
        } else {
            final com.google.api.services.drive.model.File oldFile = googleCloudFile;
            return null != updateFile(drive, oldFile.getId(), title, file);
        }
    }

    /**
     * Insert new file.
     *
     * @param service Drive API service instance.
     * @param title Title of the file to insert, including the extension.
     * @param parentId Optional parent folder's ID.
     * @param mimeType MIME type of the file to insert.
     * @param filename Filename of the file to insert.
     * @return Inserted file metadata if successful, {@code null} otherwise.
     */
    private static com.google.api.services.drive.model.File insertFile(Drive service, String title, String parentId, java.io.File fileContent) {
        // File's metadata.
        com.google.api.services.drive.model.File body = new com.google.api.services.drive.model.File();
        body.setTitle(title);

        // Set the parent folder.
        if (parentId != null && parentId.length() > 0) {
            body.setParents(
                Arrays.asList(new ParentReference().setId(parentId)));
        }

        // File's content.
        FileContent mediaContent = new FileContent("", fileContent);
        try {
            com.google.api.services.drive.model.File file = service.files().insert(body, mediaContent).execute();
            return file;
        } catch (IOException e) {
            log.error(null, e);
            return null;
        }
    }

    /**
     * Update an existing file's metadata and content.
     *
     * @param service Drive API service instance.
     * @param fileId ID of the file to update.
     * @param newTitle New title for the file.
     * @param newFilename Filename of the new content to upload.
     * @return Updated file metadata if successful, {@code null} otherwise.
     */
    private static com.google.api.services.drive.model.File updateFile(Drive service, String fileId, String newTitle, java.io.File fileContent) {
        try {
            // First retrieve the file from the API.
            com.google.api.services.drive.model.File file = service.files().get(fileId).execute();

            // File's new metadata.
            file.setTitle(newTitle);

            FileContent mediaContent = new FileContent("", fileContent);

            // Send the request to the API.
            com.google.api.services.drive.model.File updatedFile = service.files().update(fileId, file, mediaContent).setNewRevision(false).execute();

            return updatedFile;
        } catch (IOException e) {
            log.error(null, e);
            return null;
        }
    }

  private static String CLIENT_ID = "CLIENT_ID";
  private static String CLIENT_SECRET = "CLIENT_SECRET";

  private static String REDIRECT_URI = "urn:ietf:wg:oauth:2.0:oob";

  public static void main(String[] args) throws IOException {   
    GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(
        httpTransport, JSON_FACTORY, CLIENT_ID, CLIENT_SECRET, Arrays.asList(DriveScopes.DRIVE_APPDATA, DriveScopes.DRIVE))
        .setAccessType("online")
        .setApprovalPrompt("auto").build();

    String url = flow.newAuthorizationUrl().setRedirectUri(REDIRECT_URI).build();
    System.out.println("Please open the following URL in your browser then type the authorization code:");
    System.out.println("  " + url);
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    String code = br.readLine();

    GoogleTokenResponse response = flow.newTokenRequest(code).setRedirectUri(REDIRECT_URI).execute();
    GoogleCredential credential = new GoogleCredential().setFromTokenResponse(response);

    java.io.File fileContent = new java.io.File("document.txt");
    saveToGoogleDrive(credential, fileContent);
  }

    private static final GsonFactory JSON_FACTORY = GsonFactory.getDefaultInstance();

    /** Global instance of the HTTP transport. */
    private static HttpTransport httpTransport;


    private static final Log log = LogFactory.getLog(Insert.class);

    static {
        try {
            // initialize the transport
            httpTransport = GoogleNetHttpTransport.newTrustedTransport();

        } catch (IOException ex) {
            log.error(null, ex);
        } catch (GeneralSecurityException ex) {
            log.error(null, ex);
        }
    }

}

2016 年 1 月 1 日更新

这个问题似乎已经解决了。我猜 Google Drive 团队已经修复了它。

最佳答案

注意:请不要将此视为“Google 的官方回答”。虽然我在 Google 工作，但我并不从事 Drive API 方面的工作。

我已重现该问题，并将其报告给 Drive API 团队，他们可能能够提供更多详细信息。与此同时，我发现的一种解决方法是删除

setNewRevision(false)

第 1414 行的 update 调用的一部分。这不是一个理想的解决方法，因为这意味着您将获得每个更新的新修订，这将耗尽存储配额。但是，它似乎确实避免了您所看到的问题。

关于java - 无法更新应用数据范围内的文件存储 - 500 内部服务器错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/23707388/