Get some common parameters in request

Request. getremoteaddr (); // visitor IP Address
Request. getrequesturi (); // ip address of the access page


String agent = request. getheader ("User-Agent ");
Stringtokenizer ST = new stringtokenizer (agent ,";");
St. nexttoken ();
St. nexttoken (); // get the visitor's browser name
System. getproperty ("OS. Name"); // obtain the operating system name of the visitor.
Request. getattribute ("title"); // obtain the title
If (visitpagetitle = NULL | visitpagetitle. Equals ("")){
Visitpagetitle = "No title ";
}
String backip = Req. getheader ("Referer"); // obtain the parent page
If (backip = NULL | backip. Equals ("")){
Backip = "direct user access ";
}