Send a post login from java code and get cookie authentication -

i need login iis web-server.

after login, need send http post lot of data.

however, don't know how save cookies login , reuse them subsequent http calls.

my code

private final static logger logger = logger.getlogger(httpurlconnectionexample.class);  private static final string certificate_client = "/src/main/resources/clientcert.jks"; private static final string javax_net_ssl_key_store_password = "javax.net.ssl.keystorepassword"; private static final string javax_net_ssl_key_store = "javax.net.ssl.keystore"; private static propertiesmanagement management; private static final string login_page = "https://alloggiatiweb.poliziadistato.it/alloggiatiweb/login.aspx"; private static final string cookies_header = "set-cookie"; private static cookiemanager mscookiemanager = new cookiemanager(); private static final string internal_page = "https://alloggiatiweb.poliziadistato.it/alloggiatiweb/analisi.aspx"; private httpsurlconnection conn;  private static void setcertificatessl() throws filenotfoundexception, keystoreexception, ioexception, nosuchalgorithmexception, certificateexception {     fileinputstream fin = new fileinputstream(management.getfilepath());     keystore ks = keystore.getinstance(management.getsslprotocol());     ks.load(fin, management.getpassword().tochararray());     system.setproperty(javax_net_ssl_key_store, certificate_client);     system.setproperty(javax_net_ssl_key_store_password, management.getpassword()); }  public static void main(string[] args) throws exception {     management = new propertiesmanagement();     setcertificatessl();     httpurlconnectionexample http = new httpurlconnectionexample();     http.login(); }  private void getinternalpage() throws exception {     url obj = new url(internal_page);     conn = (httpsurlconnection) obj.openconnection();     conn.setreadtimeout(10000);     conn.setconnecttimeout(15000);     conn.setrequestmethod("get");     conn.setdoinput(true);     conn.connect();     logger.info("[get on " + obj + " response code-message]" + conn.getresponsecode() + " - " + conn.getresponsemessage());     bufferedreader in = new bufferedreader(new inputstreamreader(conn.getinputstream()));     string inputline;     stringbuffer response = new stringbuffer();     while ((inputline = in.readline()) != null) {         response.append(inputline);     }     in.close();     logger.info(response.tostring()); }  private void login() throws exception {     url obj = new url(login_page);     conn = (httpsurlconnection) obj.openconnection();     conn.setreadtimeout(10000);     conn.setconnecttimeout(15000);     conn.setrequestmethod("post");     conn.setdooutput(true);     list<namevaluepair> params = new arraylist<namevaluepair>();     params.add(new basicnamevaluepair("txtutente", management.getusername()));     params.add(new basicnamevaluepair("txtpwd", management.getpassword()));      outputstream os = conn.getoutputstream();     bufferedwriter writer = new bufferedwriter(new outputstreamwriter(os, "utf-8"));     writer.write(getquery(params));     writer.flush();     writer.close();     os.close();     conn.connect();     map<string, list<string>> headerfields = conn.getheaderfields();     list<string> cookiesheader = headerfields.get(cookies_header);     if (cookiesheader != null) {         (string cookie : cookiesheader) {             mscookiemanager.getcookiestore().add(null, httpcookie.parse(cookie).get(0));         }     }     logger.info("[post on " + obj + " response code-message]" + conn.getresponsecode() + " - " + conn.getresponsemessage());     getinternalpage();     conn.disconnect(); }  private string getquery(list<namevaluepair> params) throws unsupportedencodingexception {     stringbuilder result = new stringbuilder();     boolean first = true;     (namevaluepair pair : params) {         if (first)             first = false;         else             result.append("&");         result.append(urlencoder.encode(pair.getname(), "utf-8"));         result.append("=");         result.append(urlencoder.encode(pair.getvalue(), "utf-8"));     }     return result.tostring(); } 

and response

 info (httpurlconnectionexample.java:125) [19 apr 2016 15:08:51,013] - [post on https://alloggiatiweb.poliziadistato.it/alloggiatiweb/login.aspx response code-message]200 - ok  info (httpurlconnectionexample.java:83) [19 apr 2016 15:08:51,461] - [get on https://alloggiatiweb.poliziadistato.it/alloggiatiweb/analisi.aspx response code-message]200 - ok  info (httpurlconnectionexample.java:94) [19 apr 2016 15:08:51,464] - <!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transit ..... 

but page print aren't internal page it's login page