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嗨我只是玩弄数据存储,希望有人可以告诉我为什么我的简单代码不起作用?我刚才被玩弄如何把,并从数据存储串...不幸的是我的GAE能力弱一起我弱弱的Java能力......GAE数据存储放入并得到
@SuppressWarnings("serial")
public class LoopingProgramServlet extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws IOException {
Key key = KeyFactory.createKey("a","b");
String Teststring = "pleasework";
Entity greeting = new Entity("meh", key);
greeting.setProperty("teststring", Teststring);
DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
datastore.put(greeting);
Entity greetings = null;
resp.setContentType("text/plain");
resp.getWriter().println("doing something");
try {
greetings = datastore.get(key);
String string = (String) greetings.getProperty("teststring");
if (string == null) {
resp.setContentType("text/plain");
resp.getWriter().println("null");
System.out.println("null");
} else {
resp.setContentType("text/plain");
resp.getWriter().println("contains something");
System.out.println("contains something");
}
resp.setContentType("text/plain");
resp.getWriter().println(string);
} catch (EntityNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
非常感谢。这是世界上最简单的修复,现在这一切都变得非常有道理......我对被阻碍的道歉表示歉意,我只是想跟随那些并不特定于我想让它工作的教程! – 2013-05-12 10:10:49
没问题。第一次通过时,很容易错过稍后会变得更有意义的一些事情的意义。 – 2013-05-12 18:43:47