随机增加访问次数JSP

Question

以下代码在访问者访问jsp页面时不显示访问次数。此处计数器增加一个固定数字，即增加一（+1）。我如何增加号码。每次访问刷新时，随机访问次数分别是10，15，18等。

JSP ----------------------

    Integer hitsCount = (Integer)application.getAttribute("hitCounter");
                if( hitsCount ==null || hitsCount == 0 )
                {
                    /* First visit */
                    hitsCount = 1;
                }
                else
                {
                    /* return visit */
                    hitsCount += 1; // Here I want that hitsCount to be 
 increased by random number lets say by +=10, +=15, +=18 etc each time the 
 page gets refreshed
                }
                application.setAttribute("hitCounter", hitsCount);
         out.println(hitsCount);// shows total no of visits