Unable to connect sqlserver with jsp

i am unable to connect sql server and jsp
I am unable to understand what driver do i need to download and from where. what all connectiond do i need to make bfore runnind this code
although this code gives exception of class not found
public class why
{
public static void main(String args[])
{
try
{
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
String connectionUrl = "jdbc:sqlserver://localhost;database=mysu;";
Connection con = DriverManager.getConnection(connectionUrl);


}catch(Exception e)
{
System.out.println("SOME FLAW IS THERE PLEASE ENTER AGAIN"+e);
}
System.out.println("ff");
}
}

please reply