在我的应用程序中,我需要发送各种POST
请求到服务器。其中一些请求有答复,其他请求没有答复。Android:发送没有回应的帖子
这是我用来发送请求的代码:
private static final String TAG = "Server";
private static final String PATH = "http://10.0.0.2:8001/data_connection";
private static HttpResponse response = null;
private static StringEntity se = null;
private static HttpClient client;
private static HttpPost post = null;
public static String actionKey = null;
public static JSONObject sendRequest(JSONObject req) {
try {
client = new DefaultHttpClient();
actionKey = req.getString("actionKey");
se = new StringEntity(req.toString());
se.setContentEncoding(new BasicHeader(HTTP.CONTENT_ENCODING, "application/json"));
se.setContentType(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
post = new HttpPost(PATH);
post.setEntity(se);
Log.d(TAG, "http request is being sent");
response = client.execute(post);
Log.d(TAG, "http request was sent");
if (response != null) {
InputStream in = response.getEntity().getContent();
String a = convertFromInputStream(in);
in.close();
return new JSONObject(a);
}
} catch (UnsupportedEncodingException e) {
Log.d(TAG, "encoding request to String entity faild!");
e.printStackTrace();
} catch (ClientProtocolException e) {
Log.d(TAG, "executing the http POST didn't work");
e.printStackTrace();
} catch (IOException e) {
Log.d(TAG, "executing the http POST didn't work");
e.printStackTrace();
} catch (JSONException e) {
Log.d(TAG, "no ActionKey");
e.printStackTrace();
}
return null;
}
private static String convertFromInputStream(InputStream in)
throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(in));
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = br.readLine()) != null) {
sb.append(line);
}
return (sb.toString());
}
这是发送请求的
AsyncTask
类的代码:
class ServerRequest extends AsyncTask<JSONObject, Void, JSONObject> {
@Override
protected JSONObject doInBackground(JSONObject... params) {
JSONObject req = params[0];
JSONObject response = Server.sendRequest(req);
return response;
}
@Override
protected void onPostExecute(JSONObject result) {
// HANDLE RESULT
super.onPostExecute(result);
}
}
我的问题当服务器没有返回响应时开始。即使完成工作,
AsyncTask
线程仍保持打开状态,因为
HTTPClient
从不关闭连接。
有没有办法不等待回应?这肯定会给服务器增加很多开销,因为所有试图连接到它的Android应用程序都会使连接保持活动状态,并且可能会导致应用程序本身出现很多问题。
基本上,我正在寻找的是一种方法,将允许我发送到POST
消息并在请求发送后立即终止连接,因为没有响应以我的方式发送。
这并没有什么意义。为什么没有回应?除非你长时间轮询,否则应该有一些回应,即使它没有一个机构,只是一个状态码。如果你没有得到/等待回应,你怎么能确定服务器甚至收到你的请求? –