How do I handle javascript authentication from java code like a browser ?

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Java

in the code below if i hit this url from browser it return me back with pop up java script require username and password but if i call it from java it return me with

Exception in thread "main" java.io.IOException: Server returned HTTP response code: 401 for URL sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1894)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1492)
	at java.net.URL.openStream(URL.java:1045)
	at jaxbapp.JaxbAPP.main(JaxbAPP.java:29)

so how i send username and password and consume this soap service from java

What I have tried:

URL url = new URL("http://serverurl:port/sap/bc/srt/wsdl/flv_10002A111AD1/b/stp/bc/srt/rfc/sap/zsd_mob_get_cust/110/zsd_mob_get_cust_serv/zsd_mob_get_cust_bind?x-client=110");
                   HttpURLConnection con = (HttpURLConnection) url.openConnection();
               con.setDoOutput(true);
               con.setRequestMethod("POST");
                               con.setRequestProperty("Content-Type", "application/soap+xml;charset=UTF-8;action=\"urn:sap-com:document:sap:rfc:functions:ZSD_MO_GET_C:ZSD_RRequest");
                BufferedReader reader = new BufferedReader( new InputStreamReader(url.openStream()));
           while(reader.readLine()!=null) {
               System.out.println(reader.readLine());
           }