servlet实现统计网站被访问次数功能

public class Test1 extends HttpServlet {

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.setContentType("text/html;charset=utf-8");
PrintWriter out=response.getWriter();
ServletContext sc = request.getServletContext();
Object o = sc.getAttribute("access");
if (o != null && o instanceof Integer) {
o = ((Integer) o) + 1;
out.print("网站共"+o+"次访问");
sc.setAttribute("access", o);
} else {
sc.setAttribute("access", 1);
out.print("网站共1次访问");
}
}