I have some servlets in GAE, called from an Android app; and I want to send
a POST request from one of these servlets to a php hosted in localhost
using xampp. The servlet reaches an IOException when trying to read the
response.
This is the code of a the sample servlet i am using:
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String result = "";
try {
URL url = new URL("http://172.25.3.50:80/tempofinito/prueba.php";);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setRequestMethod("POST");
con.setDoOutput(true);
con.setDoInput(true);
// Send
DataOutputStream wr = new DataOutputStream (
con.getOutputStream ());
wr.writeBytes ("prueba=" + URLEncoder.encode("message","UTF-8"));
wr.flush ();
wr.close ();
// Response
InputStream is = con.getInputStream();
BufferedReader rd = new BufferedReader(new InputStreamReader(is));
String line;
StringBuffer resp = new StringBuffer();
while((line = rd.readLine()) != null) {
resp.append(line);
resp.append('\r');
}
rd.close();
result = resp.toString();
} catch (MalformedURLException e) {
result = "malformed";
} catch (IOException e) {
result = "ioexception";
}
// Sends result to Android APP
PrintWriter out = response.getWriter();
out.println(result);}
This is the php file:
<?php
$variable = $_POST["prueba"];
echo "ESTO ES UNA PRUEBA ".$variable;
?>
And this is the Android code:
new AsyncTask<Void, Void, String>() {
protected String doInBackground(Void... params) {
HttpClient client = new DefaultHttpClient();
HttpPost postMethod = new HttpPost(Globals.serverURL + "/prueba");
String result = "";
try {
// Ignore this ->
ArrayList<NameValuePair> nameValuePairs = new
ArrayList<NameValuePair>(3);
nameValuePairs.add(new BasicNameValuePair("UserName",
Globals.user));
nameValuePairs.add(new BasicNameValuePair("Pass",
Globals.encrypt(Globals.pass)));
nameValuePairs.add(new BasicNameValuePair("Mode", "user"));
// <-
postMethod.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = client.execute(postMethod);
HttpEntity entity = response.getEntity();
result = EntityUtils.toString(entity);
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
So, the APP calls the servlet "prueba". This servlet just tries to send a
POST request to the php file, but reaches an IOException in the
"//Response" part. I suppose I'm doing something wrong because if I copy
the same code from the servlet and paste it in the Android APP, instead of
the code above, it works fine.
Should I do it in a different way inside Google App Engine? What I want is
to communicate a servlet in GAE with an external server which will interact
with an external database. I can't use Google Cloud Storage because the
database should be in that external server.
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