从数据存储区读取GAE
[英]GAE Reading from Datastore
问题描述
I want to return myHighscores from Datastore: ie: Paul,1200 Tom,1000 Kevin,800 
我想从数据存储区返回myHighscores：即：Paul，1200 Tom，1000 Kevin，800
private void returnHighscores(HttpServletResponse resp, String game, int max) throws IOException {
DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
Key gameKey = KeyFactory.createKey("game", game);
Query query = new Query("highscore", gameKey);
query.addSort("points", Query.SortDirection.DESCENDING);
List<Entity> highscores = datastore.prepare(query).asList(FetchOptions.Builder.withLimit(max));
for(Entity e : highscores) {
resp.getWriter().println(e.getProperty("name") + "," + e.getProperty("points"));
}
}
and it is working :) ! 它正在工作:)！ But when I want to read the returned Highscores and add the String to a textView with: 但是当我想阅读返回的Highscores并将String添加到textView时，具有：
AndroidHttpClient client = AndroidHttpClient.newInstance("Mueckenfang");
HttpPost request = new HttpPost(HIGHSCORE_SERVER_BASE_URL + "?game=" + HIGHSCORESERVER_GAME_ID);
HttpResponse response = client.execute(request);
HttpEntity entity = response.getEntity();
InputStreamReader reader = new InputStreamReader(entity.getContent(), "utf-8");
int c = reader.read();
while (c > 0) {
highscores += (char) c;
c = reader.read();
}
TextView tv = (TextView) findViewById(R.id.highscoreTv);
tv.setText(highscores);
I only get some HTML code like: 我只得到一些HTML代码，例如：
><html><head><meta http-euiv="content-type"content="text/html;charset=utf-8"><title>405 GTTP method POST is....
But i want something like Paul,1200 Tom,1000 Kevin 800 and so on 但是我想要Paul，1200 Tom，1000 Kevin 800等
2 个解决方案
解决方案1
1 已采纳 2015-06-26 10:03:13
HttpPost not accepted query parameter, as like "?game=" + HIGHSCORESERVER_GAME_ID. HttpPost不接受查询参数，例如"?game=" + HIGHSCORESERVER_GAME_ID.
you need to pass that values as 您需要将该值传递为
AndroidHttpClient client = AndroidHttpClient.newInstance("Mueckenfang");
HttpPost request = new HttpPost(HIGHSCORE_SERVER_BASE_URL);
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
nameValuePairs.add(new BasicNameValuePair("game", String.valueOf(HIGHSCORESERVER_GAME_ID)));
request.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = client.execute(request);
HttpEntity entity = response.getEntity();
解决方案2
1 2015-06-27 11:58:31
The issue is your handler on appengine supporting only http 'GET'( I think you are overriding only doGet) but you are using 'POST' from the client. 问题是您在Appengine上的处理程序仅支持http'GET'（我认为您仅覆盖doGet），但是您正在从客户端使用'POST'。 Change the http method on client side to 'GET'. 将客户端的http方法更改为“ GET”。
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