GAE/GWT java应用程序中的OAuth2令牌无效

我正在开发一个GWT/GAE java应用程序，

只需通过GWT地理位置实现获取用户位置（效果非常好）
点击按钮应该将纬度、经度和准确性写入谷歌电子表格

当我点击"保存到电子表格"按钮时，我在eclipse控制台中收到以下错误消息：

04.09.2012 16:44:01 com.google.appengine.repackaged.org.apache.http.impl.client.DefaultRequestDirector handleResponse
WARNUNG: Authentication error: Unable to respond to any of these challenges: {authsub=WWW-Authenticate: AuthSub realm="https://www.google.com/accounts//AuthSubRequest"}
com.google.gdata.client.GoogleService$SessionExpiredException: OK
<HTML>
<HEAD>
<TITLE>Token invalid - Invalid token: Stateless token parent not found</TITLE>
</HEAD>
<BODY BGCOLOR="#FFFFFF" TEXT="#000000">
<H1>Token invalid - Invalid token: Stateless token parent not found</H1>
<H2>Error 401</H2>
</BODY>
</HTML>
at com.google.gdata.client.http.GoogleGDataRequest.handleErrorResponse(GoogleGDataRequest.java:570)
at com.google.gdata.client.http.HttpGDataRequest.checkResponse(HttpGDataRequest.java:560)
at com.google.gdata.client.http.HttpGDataRequest.execute(HttpGDataRequest.java:538)
at com.google.gdata.client.http.GoogleGDataRequest.execute(GoogleGDataRequest.java:536)
at com.google.gdata.client.Service.getFeed(Service.java:1135)
at com.google.gdata.client.Service.getFeed(Service.java:998)
at com.google.gdata.client.GoogleService.getFeed(GoogleService.java:645)
at com.google.gdata.client.Service.getFeed(Service.java:1017)
at com.cloudpilots.locator.server.GSpreadsheetServiceImpl.insertRow(GSpreadsheetServiceImpl.java:42)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.google.appengine.tools.development.agent.runtime.Runtime.invoke(Runtime.java:115)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:569)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:208)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248)
at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:35)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:60)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:125)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.BackendServersFilter.doFilter(BackendServersFilter.java:97)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:94)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:370)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)

所以这肯定是凭证/令牌的问题。

以下是服务器端RPC服务代码：

public class GSpreadsheetServiceImpl extends RemoteServiceServlet implements
        GSpreadsheetService {
    @Override
    public void insertRow(String latitude, String longitude, String accuracy) {
        try {
            String userId = UserServiceFactory.getUserService().getCurrentUser().getUserId();
            Credential credential = OAuth2Utils.initializeFlow().loadCredential(userId);
            SpreadsheetService service = new SpreadsheetService("Locator-v1");
            service.setOAuth2Credentials(credential);
            // Define the URL to request.  This should never change.
            URL SPREADSHEET_FEED_URL = new URL(
                "https://spreadsheets.google.com/feeds/spreadsheets/private/full");
            // Make a request to the API and get all spreadsheets.
            SpreadsheetFeed feed = service.getFeed(SPREADSHEET_FEED_URL,
                SpreadsheetFeed.class);
            List<SpreadsheetEntry> spreadsheets = feed.getEntries();
            // TODO: Choose a spreadsheet more intelligently based on your
            // app's needs.
            SpreadsheetEntry spreadsheet = spreadsheets.get(0);
            for (SpreadsheetEntry spreadsheetEntry : spreadsheets) {
                if (spreadsheetEntry.getKey() == "MY_SPREADSHEET_KEY") {
                    spreadsheet = spreadsheetEntry;
                    break;
                }
            }
            // Get the first worksheet of the first spreadsheet.
            // TODO: Choose a worksheet more intelligently based on your
            // app's needs.
            WorksheetFeed worksheetFeed = service.getFeed(
                spreadsheet.getWorksheetFeedUrl(), WorksheetFeed.class);
            List<WorksheetEntry> worksheets = worksheetFeed.getEntries();
            WorksheetEntry worksheet = worksheets.get(0);
            // Fetch the list feed of the worksheet.
            URL listFeedUrl = worksheet.getListFeedUrl();
            ListFeed listFeed = service.getFeed(listFeedUrl, ListFeed.class);
            // Create a local representation of the new row.
            ListEntry row = new ListEntry();
            row.getCustomElements().setValueLocal("Latitude", latitude);
            row.getCustomElements().setValueLocal("Longitude", longitude);
            row.getCustomElements().setValueLocal("Accuracy", accuracy);
            // Send the new row to the API for insertion.
            row = service.insert(listFeedUrl, row);
        } catch (ServiceException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

这是OAuth2Utils类：

public class OAuth2Utils {
    /** Global instance of the HTTP transport. */
    static final HttpTransport HTTP_TRANSPORT = new UrlFetchTransport();
    /** Global instance of the JSON factory. */
    static final JsonFactory JSON_FACTORY = new JacksonFactory();
    static String getRedirectUri(HttpServletRequest req) {
        GenericUrl url = new GenericUrl(req.getRequestURL().toString());
        url.setRawPath("/oauth2callback");
        return url.build();
    }
    static GoogleAuthorizationCodeFlow initializeFlow() throws IOException {
        return new GoogleAuthorizationCodeFlow.Builder(HTTP_TRANSPORT,
                JSON_FACTORY, "MY_CLIENT_ID",
                "MY_KEY",
                Collections.singleton("https://spreadsheets.google.com/feeds/"))
                .setCredentialStore(new AppEngineCredentialStore())
                .setAccessType("offline").build();
    }
}

有人知道问题出在哪里吗？

致问候，

Juri Wiens

这种方式有效：

1）使用谷歌驱动器DrEdit示例进行OAuthhttps://developers.google.com/drive/examples/java

注意：你需要添加刷新令牌，我发现添加它并不难。

2）像这样连接：

    SpreadsheetService service = new SpreadsheetService("cellmaster-v0.2");
    // Authorize the service object for a specific user (see other sections)
    service.setHeader("Authorization", "Bearer " + accessToken);

    URL SPREADSHEET_FEED_URL = getSpreadsheetUrl(spreadsheetKey);
    spreadsheet = service.getEntry 
            (SPREADSHEET_FEED_URL, SpreadsheetEntry.class);

我看了很多例子。我花了几天时间才找到这个解决方案。

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