[英]recovering programmatically the ServingUrl of a blob uploaded in BlobStore using the BlobInfo?
我想使用BlobInfo實體恢復在BlobStore中上傳的Blob的ServingUrl
我的doGet()方法中的代碼是:
ImagesService imagesService = ImagesServiceFactory.getImagesService();
Iterator<BlobInfo> iterator = null;
iterator = new BlobInfoFactory().queryBlobInfos();
while (iterator.hasNext()) {
if(iterator.next().getFilename().equals("test.png"))
{ resp.getWriter().println(iterator.next().getBlobKey()) ;// the result is <BlobKey: aKQyp27ZfDgvEdPE8QvMAQ>
resp.getWriter().println(iterator.next().getFilename());//the result is test.png
BlobKey bk=iterator.next().getBlobKey();
String urlStr=imagesService.getServingUrl(ServingUrlOptions.Builder.withBlobKey(bk));
resp.getWriter().println(urlStr);
}
}
我收到此錯誤:
HTTP錯誤500
訪問/注冊財務時出現問題。 原因:
INTERNAL_SERVER_ERROR
造成原因:
com.com.google.appengine.api.datastore.QueryResultIteratorImpl.next(QueryResultIteratorImpl.java:26)處com.google.appengine.api.datastore.QueryResultIteratorImpl.next(QueryResultIteratorImpl.java:75)處的java.util.NoSuchElementException。 com.google.appengine.api.blobstore.BlobInfoFactory $ 1.next(BlobInfoFactory.java:100)上google.appengine.api.blobstore.BlobInfoFactory $ 1.next(BlobInfoFactory.java:108)在com.EnrollementFinaleServlet.doGet(EnrollementFinaleServlet。 org.mortbay.jetty.servlet.ServletHolder.handle的javax.servlet.http.HttpServlet.service(HttpServlet.java:617)的java:135) (ServletHolder.java:511),位於org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter(ServletHandler.java:1166),位於com.google.appengine.api.socket.dev.DevSocketFilter.doFilter(DevSocketFilter.java:74 ),位於com.google.appengine.tools.development.Respo上的org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter(ServletHandler.java:1157) n。 34)在org.mortbay上的org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter(ServletHandler.java:1157)在com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:63) org.mortbay.jetty.servlet.ServletHandler $ CachedChain上的com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)上的.jetty.servlet.ServletHandler $ CachedChain.doFilter(ServletHandler.java:1157) com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:125)的.doFilter(ServletHandler.java:1157)org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter(ServletHandler.java:1157) ),網址為com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectReque com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectModuleRequest(DevAppServerModulesFilter.java:349)上的st(DevAppServerModulesFilter.java:366)com.google.appengine.tools.development.DevAppServerModulesFilter.doFilter(DevAppServerModulesFilter.doFilter(DevAppServerModulesFilter.java:116)在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter(ServletHandler.java:1157)在org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)在org.mortbay.jetty.security.SecurityHandler org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)(org.mortbay.jetty.handler.ContextHandler .__ handle(ContextHandler.java:765)處的.handle(SecurityHandler.java:216) org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)上的mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java)在com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext。 java:98),網址為org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.j ava:152)在com.google.appengine.tools.development.JettyContainerService $ ApiProxyHandler.handle(JettyContainerService.java:490)在org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)在org.mortbay org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)處的org.mortbay.jetty.HttpConnection $ RequestHandler.headerComplete(HttpConnection.java:923)處的.jetty.Server.handle(Server.java:326) org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)的org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547)org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)在org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)在org.mortbay.thread.QueuedThreadPool $ PoolThread.run(QueuedThreadPool.java:582)
由Jetty://提供技術支持
如果您能幫助我,我將不勝感激。
問題解決了,這是由兩行引起的:
resp.getWriter().println(iterator.next().getBlobKey());
resp.getWriter().println(iterator.next().getFilename());
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