try 
{ 
String proxy_internet_address = "198.34.23.87"; 
int proxy_internet_port = 80; 
ProxyAuthenticator proxAuth = new ProxyAuthenticator("userid","pwd"); 
java.net.Authenticator.setDefault(proxAuth); 

URL url = new URL("http://yourodmain/url"); 

java.util.Properties systemProperties = System.getProperties(); 
systemProperties.setProperty("http.proxyHost",proxy_internet_address); 
systemProperties.setProperty("http.proxyPort",String.valueOf(proxy_internet_port)); 

HttpURLConnection aConnection = (HttpURLConnection)(url.openConnection()); 
aConnection.setDoInput(true); 
aConnection.setDoOutput(true); 
aConnection.setUseCaches(false); 
aConnection.connect(); 

InputStreamReader insr = new InputStreamReader(aConnection.getInputStream()); 
br = new BufferedReader(insr); 
while((textString = br.readLine())!=null){ 
s = s + textString; 
} 
br.close(); 
aConnection.disconnect(); 
} catch(Exception ex) { 
ex.printStackTrace(); 
}