java - The "inverse" method of getParameter() -

one way of sending user parameters appending them url:

urladdress+="?param1=value1+param2=value2" 

how else can send user parameters server? these params read httpservletrequest method

getparameter(param1); 

on receiver's end.

i tried

setrequestproperty("param1","value1");  

of httpurlconnection. however, getparameter() couldn't find them on request.

i trying send them outside th url won`t visible.

you have 2 possibilities: either append them url in case of request, visible, or write them body in case of post request:

/**  * convert map query string.  * @param values map values  *               <code>null</code> encoded empty string, other  *               objects converted  *               string calling <code>tostring()</code> method.  * @return e.g. "key1=value&key2=&email=max%40example.com"  */ public static string querystring(map<string, object> values) {     stringbuilder sbuf = new stringbuilder();     string separator = "";      (map.entry<string, object> entry : values.entryset()) {         string value = entry.getvalue() == null                 ? "" : string.valueof(entry.getvalue());         sbuf.append(separator);         sbuf.append(urlencode(entry.getkey()));         sbuf.append('=');         sbuf.append(urlencode(value));         separator = "&";     }      return sbuf.tostring(); }  static string urlencode(string value) {     try {         return urlencoder.encode(value, "utf-8");     } catch (unsupportedencodingexception e) {         return value;     } } 

in case of post, have set header content-type application/x-www-form-urlencoded. recommend using 'utf-8' encoding. if not appropriate you, have dig how handle different encodings.

so instead of

http://www.example.com/path/resource?abc=124&xyz=john+doe 

you write body:

abc=124&xyz=john+doe 

setting parameters headers (addrequestheader()) should not done, since middleware (e.g. web application firewall, proxy, load-balancer) parse headers , conflict pre-defined headers.

the above code taken davidwebb. there can see list of libraries can ease life when have deal http requests , don't want use httpurlconnection natively.

why did add code building query string?

you can read many questions here on mistake didn't encode parameter names or values correctly.