Android Java HTTP POST Request

Question

I have to do a http post request to a web-service for authenticating the user with username and password  The Web-service guy gave me following information to construct HTTP Post request   POST  login dologin HTTP 1 1 Host  webservice companyname com Content-Type  application x-www-form-urlencoded Content-Length  48  id username amp num password amp remember on amp output xml   The XML Response that i will be getting is   lt  xml version  1 0  encoding  ISO-8859-1   gt   lt login gt    lt message gt  lt   CDATA    gt  lt  message gt    lt status gt  lt   CDATA true   gt  lt  status gt    lt Rlo gt  lt   CDATA Username   gt  lt  Rlo gt    lt Rsc gt  lt   CDATA 9L99PK1KGKSkfMbcsxvkF0S0UoldJ0SU   gt  lt  Rsc gt    lt Rm gt  lt   CDATA b59031b85bb127661105765722cd3531  AO1YjN5QDM5ITM   gt  lt  Rm gt    lt Rl gt  lt   CDATA username company com   gt  lt  Rl gt    lt uid gt  lt   CDATA 3539145   gt  lt  uid gt    lt Rmu gt  lt   CDATA f8e8917f7964d4cc7c4c4226f060e3ea   gt  lt  Rmu gt   lt  login gt    This is what i am doing    HttpPost postRequest   new HttpPost urlString   How do i construct the rest of the parameters

User · Answer

Try HttpClient for Java    http   hc apache org httpclient-3 x

User · Answer

I used the following code to send HTTP POST from my android client app to C  desktop app on my server      Create a new HttpClient and Post Header HttpClient httpclient   new DefaultHttpClient    HttpPost httppost   new HttpPost  http   www yoursite com script php     try          Add your data     List lt NameValuePair gt  nameValuePairs   new ArrayList lt NameValuePair gt  2       nameValuePairs add new BasicNameValuePair  id    12345         nameValuePairs add new BasicNameValuePair  stringdata    AndDev is Cool          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     I worked on reading the request from a C  app on my server  something like a web server little application   I managed to read request posted data using the following code   server   new HttpListener    server Prefixes Add  http     50000     server Start     HttpListenerContext context   server GetContext    HttpListenerContext context   obj as HttpListenerContext  HttpListenerRequest request   context Request   StreamReader sr   new StreamReader request InputStream   string str   sr ReadToEnd

User · Answer

Please consider using HttpPost  Adopt from this  http   www javaworld com javatips jw-javatip34 html  URLConnection connection   new URL  http   webservice companyname com login dologin   openConnection       Http Method becomes POST connection setDoOutput true       Encode according to application x-www-form-urlencoded specification String content        id     URLEncoder encode   username           amp num     URLEncoder encode   password           amp remember     URLEncoder encode   on           amp output     URLEncoder encode   xml    connection setRequestProperty  Content-Type    application x-www-form-urlencoded         Try this should be the length of you content     it is not neccessary equal to 48      content getBytes   length is not neccessarily equal to content length   if the String contains non ASCII characters  connection setRequestProperty  Content-Length   content getBytes   length        Write body OutputStream output   connection getOutputStream     output write content getBytes     output close      You will need to catch the exception yourself

User · Answer

You can reuse the implementation I added to ACRA  http   code google com p acra source browse tags REL-3 1 0 CrashReport src org acra HttpUtils java r 236   See the doPost Map  Url  method  working over http and https even with self signed certs

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HTTP request POST in java does not dump the answer   public class HttpClientExample     private final String USER AGENT    Mozilla 5 0    public static void main String   args  throws Exception      HttpClientExample http   new HttpClientExample     System out println   nTesting 1 - Send Http POST request    http sendPost            HTTP POST request  private void sendPost   throws Exception    String url    http   www wmtechnology org Consultar-RUC index jsp    HttpClient client   new DefaultHttpClient    HttpPost post   new HttpPost url       add header post setHeader  User-Agent   USER AGENT    List lt NameValuePair gt  urlParameters   new ArrayList lt  gt     urlParameters add new BasicNameValuePair  accion    busqueda             urlParameters add new BasicNameValuePair  modo    1     urlParameters add new BasicNameValuePair  nruc    10469415177      post setEntity new UrlEncodedFormEntity urlParameters     HttpResponse response   client execute post   System out println   nSending  POST  request to URL       url   System out println  Post parameters       post getEntity     System out println  Response Code      response getStatusLine   getStatusCode       BufferedReader rd   new BufferedReader new   InputStreamReader response getEntity   getContent         StringBuilder result   new StringBuilder      String line         while   line   rd readLine       null                   result append line                   System out println line                    This is the web  http   www wmtechnology org Consultar-RUC index jsp from you can consult Ruc without captcha  Your opinions are welcome

User · Answer

to  BalusC answer I would add how to convert the response in a String   HttpResponse response   client execute request   HttpEntity entity   response getEntity    if  entity    null        InputStream instream   entity getContent         String result   RestClient convertStreamToString instream       Log i  Read from server   result       Here is an example of convertStramToString

User · Answer

Here s an example previously found at androidsnippets com  the site is currently not maintained anymore       Create a new HttpClient and Post Header HttpClient httpclient   new DefaultHttpClient    HttpPost httppost   new HttpPost  http   www yoursite com script php     try          Add your data     List lt NameValuePair gt  nameValuePairs   new ArrayList lt NameValuePair gt  2       nameValuePairs add new BasicNameValuePair  id    12345         nameValuePairs add new BasicNameValuePair  stringdata    AndDev is Cool          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     So  you can add your parameters as BasicNameValuePair   An alternative is to use  Http URLConnection  See also Using java net URLConnection to fire and handle HTTP requests  This is actually the preferred method in newer Android versions  Gingerbread    See also this blog  this developer doc and Android s HttpURLConnection javadoc

User · Answer

I d rather recommend you to use Volley to make GET  PUT  POST    requests   First  add dependency in your gradle file   compile  com he5ed lib volley android-cts-5 1 r4   Now  use this code snippet to make requests   RequestQueue queue   Volley newRequestQueue getApplicationContext              StringRequest postRequest   new StringRequest  com android volley Request Method POST  mURL                  new Response Listener lt String gt                                           Override                     public void onResponse String response                               response                         Log d  Response   response                                                            new Response ErrorListener                                          Override                     public void onErrorResponse VolleyError error                               error                         Log d  Error Response   error toString                                                                      Override             protected Map lt String  String gt  getParams                                 Map lt String  String gt   params   new HashMap lt String  String gt                       add your parameters here as key-value pairs                 params put  username   username                   params put  password   password                    return params                                   queue add postRequest

[java] Android, Java: HTTP POST Request

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