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?
It was a stupid problem with the firewall, which was blocking the connection.
Related
Please I have gone through all the question from stackoverflow, but those are not applicable to my problem.
Please have look in image request working fine from POSTMAN.
But When I tried from android code it is not working.
My Sample Android code is here.
#Override
protected String doInBackground(Void... params) {
HttpURLConnection urlConnection = null;
BufferedReader reader = null;
// Will contain the raw JSON response as a string.
String forecastJsonStr = null;
try {
URL url = new URL("sample url");
String postData = "key1=valu1&key2=valu2";
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(55000 /* milliseconds */);
conn.setConnectTimeout(55000 /* milliseconds */);
conn.setRequestMethod("POST");
conn.setDoInput(true);
conn.setDoOutput(true);
OutputStream os = conn.getOutputStream();
BufferedWriter writer = new BufferedWriter(
new OutputStreamWriter(os));
writer.write(postData);
writer.flush();
writer.close();
os.close();
int responseCode=conn.getResponseCode();
if (responseCode == HttpsURLConnection.HTTP_OK) {
BufferedReader in=new BufferedReader(
new InputStreamReader(
conn.getInputStream()));
StringBuffer sb = new StringBuffer("");
String line="";
while((line = in.readLine()) != null) {
Log.e("response ",line);
sb.append(line);
break;
}
in.close();
return sb.toString();
}
else {
return new String("false : "+responseCode);
}
} catch (Exception e) {
Log.e("PlaceholderFragment", "Error ", e);
// If the code didn't successfully get the weather data, there's no point in attemping
// to parse it.
return null;
} finally {
if (urlConnection != null) {
urlConnection.disconnect();
}
if (reader != null) {
try {
reader.close();
} catch (final IOException e) {
}
}
}
}
Above java code return 405 error code. I also tried from OkHttp also.
Please help.
Putting a '/' at the end of URL causes the redirect to happen because your server likes urls that end in '/'. POST is fully supported by the URL your server redirects you to, but the client is executing a GET request when it behaves according to your setRedirecting() call (cURL does the same exact thing with the -L switch) The fix is to either put a '/' at the end of URL, or to grab the Location header from the response yourself and then initiate another POST request manually.
This can be observed in wireshark. You can test the theory by trying to perform a GET request with your browser to the URL with a slash appended to it. That will cause the browser to get a 405. Here's the fixed code for Android, this code uses the simple fix of appending a '/' to the URL (not production ready):
Read more from here.
Do let me know if this helps :)
Additionally, try using this piece of code:
public void postData() {
// Create a new HttpClient and Post Header
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("https://your URL");
try {
// Add your data
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("id", "12345"));
nameValuePairs.add(new BasicNameValuePair("stringdata", "Hi"));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// Execute HTTP Post Request
HttpResponse response = httpclient.execute(httppost);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
} catch (IOException e) {
// TODO Auto-generated catch block
}
}
Your API call is reciveving data in GET parameter. So data should send along with url as given below
String postData = Uri.encode("key1=valu1&key2=valu2");
URL url = new URL("sample url"+"?+postData);
I just had a similar problem with the HttpClient in Java. The solution was to specify the HTTP version explicitly:
HttpClient.newBuilder()
.version(HttpClient.Version.HTTP_1_1)
.build();
Now my requests returns the same result as through Postman.
i have written an android app which post data to my database. The app should access an webservice which post the data to the database. the webservice works fine. ive testet it with my browser, he is already on the server. now i want my app to execute the webservice. but that doesnt work. My debugger doesnt work too so im not able to debug. here is my code to for accessing the webservice. any ideas??
public class PostBlog extends AsyncTask<String, Void, String> {
String BlogURL;
public PostBlog(String insertBlogURL) {
BlogURL = insertBlogURL;
}
#Override
protected String doInBackground(String... params) {
postBlogData(BlogURL);
return null;
}
public void postBlogData(String url) {
String result = "";
//the year data to send
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("year", "1980"));
//http post
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
InputStream is = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result = sb.toString();
} catch (Exception e) {
//(TextView)rootView.findViewById(R.id.question)
Log.e("log_tag", "Error converting result " + e.toString());
}
}
}
The Class is called from my main Activity by
new PostBlog(insertBlogURL).execute("");
Is there another easier way to execute my ".jsp?asdd=sdsd" file on the server?
Thanks for your ideas.
Instead of doing :
new PostBlog(insertBlogURL).execute("");
Change your constructor and retrieve the url from the doInBackground method, by doing params[0]
Then initiate the download like this
PostBlog blogPoster = new PostBlog();
try {
blogPoster.execute(insertBlogURL);
} catch (InterruptedException e) {} catch (ExecutionException e) {}
I should say this is a modified snippet of code from my own project, so it might not work exactly the way you expect.
public static String[] Webcall(String emailID) {
try {
URL url = new URL(AppConfig.URL + emailID);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setRequestProperty("Accept", "application/json");
conn.setRequestProperty("Authorization", "application/json");
conn.setRequestProperty("userEmailId", emailID);
if (conn.getResponseCode() != 200) {
throw new RuntimeException("Failed : HTTP error code : " + conn.getResponseCode());
}
BufferedReader br = new BufferedReader(new InputStreamReader((conn.getInputStream())));
String output;
System.out.println("Output from Server .... \n");
while ((output = br.readLine()) != null) {
System.out.println(output);
}
conn.disconnect();
org.json.JSONObject _jsonObject = new org.json.JSONObject(output);
org.json.JSONArray _jArray = _jsonObject.getJSONArray("manager");
String[] str = new String[_jArray.length()];
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
This is my code I am trying to call web service and get data.
But when I hit web service then I am getting below exception
Failed : HTTP error code : 404
Please suggest me where am doing wrong try to give solution for this .
The first thing is check url is it working on computer using postman or restclient and if it is working fine then tried to post using below code, this code is for posting data in json format using HttpPost you can use retrofit lib as Milad suggested.
public static String POST(String url, String email)
{
InputStream inputStream = null;
String result = "";
try {
// 1. create HttpClient
HttpClient httpclient = new DefaultHttpClient();
// 2. make POST request to the given URL
HttpPost httpPost = new HttpPost(url);
String json = "";
// 3. build jsonObject
JSONObject jsonObject = new JSONObject();
jsonObject.accumulate("email", email);
// 4. convert JSONObject to JSON to String
json = jsonObject.toString();
// 5. set json to StringEntity
StringEntity se = new StringEntity(json);
// 6. set httpPost Entity
httpPost.setEntity(se);
// 7. Set some headers to inform server about the type of the content
httpPost.setHeader("Accept", "application/json");
httpPost.setHeader("Content-type", "application/json");
// 8. Execute POST request to the given URL
HttpResponse httpResponse = httpclient.execute(httpPost);
// 9. receive response as inputStream
inputStream = httpResponse.getEntity().getContent();
// 10. convert inputstream to string
if(inputStream != null)
result = convertInputStreamToString(inputStream);
else
result = "Did not work!";
} catch (Exception e) {
Log.d("InputStream", e.getLocalizedMessage());
}
// 11. return result
return result;
}
private static String convertInputStreamToString(InputStream inputStream) throws IOException{
BufferedReader bufferedReader = new BufferedReader( new InputStreamReader(inputStream));
String line = "";
String result = "";
while((line = bufferedReader.readLine()) != null)
result += line;
inputStream.close();
return result;
}
I think u should try to re-check URL that you send request to.
follow the output error, code 404 that mean the URL is broken or dead link.
You can do the same by using jersy-client and jersy core.Here is the code snippet
private static void generateXML(String xmlName, String requestXML, String url)
{
try
{
Client client = Client.create();
WebResource webResource = client
.resource(url);
ClientResponse response = (ClientResponse)webResource.accept(new String[] { "application/xml" }).post(ClientResponse.class, requestXML);
if (response.getStatus() != 200) {
throw new RuntimeException("Failed : HTTP error code : " + response.getStatus());
}
String output = (String)response.getEntity(String.class);
PrintWriter writer = new PrintWriter(xmlName, "UTF-8");
writer.println(output);
writer.close();
}
catch (Exception e) {
try {
throw new CustomException("Rest-Client May Be Not Working From Your System");
} catch (CustomException e1) {
System.exit(1);
}
}
}
Call this method from your code with varibales.
This is for an Android application ,where my mobile developer is trying to post json data to my PHP page .
Below is the function that is being used :
public static String postData(String url, String postData) {
// Create a new HttpClient and Post Header
InputStream is = null;
StringBuilder sb = null;
String result = "";
// StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
// StrictMode.setThreadPolicy(policy);
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(url);
try {
httppost.setEntity(new StringEntity(postData));
httppost.setHeader("Accept", "application/json");
httppost.setHeader("Content-type", "application/json");
// Execute HTTP Post Request
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
} catch (Exception e) {
Log.e("log_tag", "Error in http connection" + e.toString());
//throw new CustomException("Could not establish network connection");
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "utf-8"), 8);
sb = new StringBuilder();
sb.append(reader.readLine() + "\n");
String line = "0";
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result = sb.toString();
} catch (Exception e) {
Log.e("log_tag", "Error converting result " + e.toString());
//throw new CustomException("Error parsing the response");
}
return result;
}
Where url is the link to my php webpage . On my php page , i am just trying to print out the posted data by doing :
print_r($_POST);
But it shows an empty array . I even tried using the REST addon for firefox and doing the same but it simply shows a blank array .
Would be great if someone could point out if i am missing anything .
Thanks.
you need to get the json content like below :
if(isset($_POST))
{
$json = file_get_contents('php://input');
$jsonObj = json_decode($json);
echo $jsonObj;
}
i have a url "http://184.82.158.234/~store/rest/system/connect.json" and posting this url with mozilla addon called poster returns data in form of json
what i want is to post this url from android to get that json data into androids view .
any help is highly appreciated
thanks
public void postData() {
// Create a new HttpClient and Post Header
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://184.82.158.234/~store/rest/system/connect.json");
try {
// Add your data
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("id", "12345"));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// Execute HTTP Post Request
HttpResponse response = httpclient.execute(httppost);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
} catch (IOException e) {
// TODO Auto-generated catch block
}
}
response variable will contain your json data.
Here is a function maybe you can use to post a string to a URL.
public String doHttpPost(final String fullUrl, final String body) {
final URL url = new URL(fullUrl);
final HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
// set the request mode as POST
urlConnection.setRequestMethod("POST");
urlConnection.setUseCaches(false);
urlConnection.setDoOutput(true);
urlConnection.setRequestProperty("Accept-charset", "utf-8");
urlConnection.setRequestProperty("Content-type", "application/x-www-form-urlencoded");
final DataOutputStream request = new DataOutputStream(urlConnection.getOutputStream());
// write the body.
request.writeBytes(body);
// flush output buffer
request.flush();
request.close();
// construct a read using input stream and charset.
final InputStreamReader isr = new InputStreamReader(urlConnection.getInputStream(), CHARSET_UTF8);
final BufferedReader in = new BufferedReader(isr);
String inputLine;
final StringBuilder stringBuilder = new StringBuilder();
while ((inputLine = in.readLine()) != null) {
stringBuilder.append(inputLine).append("\n");
}
in.close();
isr.close();
urlConnection.disconnect();
return stringBuilder.toString();
}
check below code: try this it may help you.
ArrayList nameValuePairs1 = new ArrayList();
nameValuePairs1.add(new BasicNameValuePair("user_id", ""));
nameValuePairs1.add(new BasicNameValuePair("product_id", ""));
nameValuePairs1.add(new BasicNameValuePair("product_review",""+text));
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(URL);
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs1));
HttpResponse responce = httpclient.execute(httppost);
HttpEntity entity = responce.getEntity();
is = entity.getContent();
BufferedReader bufr = new BufferedReader(new InputStreamReader(is1,"iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
sb.append(bufr.readLine() + "\n");
String line = "0";
while ((line = bufr.readLine()) != null)
{
sb.append(line + "\n");
}
is1.close();
result = sb.toString();
result is a json String. parse that json and display in any control. i displaied that in text view see below.
final MyProgressDialog progDailog = new MyProgressDialog(Cheking_Review.this);
final Handler handler = new Handler() {
#Override
public void handleMessage(Message msg) {
if (Name.length() > 0 && Name != null) {
txtvenue.setText(Name);
} else {
txtvenue.setText(venue_name);
}
}
};
new Thread() {
public void run() {
try {
// put your result here
JSONObject jObject = new JSONObject(result);
JSONObject menuObject = jObject.getJSONObject("response");
JSONObject venueObject = menuObject.getJSONObject("venue");
Name = venueObject.getString("name");
String id = venueObject.getString("id");
Log.d("--------name---------", Name);
Log.d("--------id---------", id);
} catch (Exception e) {
}
handler.sendEmptyMessage(0);
progDailog.dismiss();
}
}.start();