factcacheservlet.java

java web 开发,Java Xml 编程指南书籍源码

import javax.servlet.*;  // communicate with client
import javax.servlet.http.*; 

import MyNa.utils.Logger;  // saves admin/debug info to file

import MyNa.utils.Env;   // basic package
import MyNa.utils.FactCache;
import MyNa.utils.HtmlWrapper; // sends HTML to client.
import java.io.IOException; // thrown by HtmlWrapper
import MyNa.utils.MiscDate; // for logging.


public class FactCacheServlet extends HttpServlet { 
Logger lg=null;

  public void doGet (HttpServletRequest req, 
                     HttpServletResponse res)
          throws ServletException, IOException{
    doPost(req,res); 
  }

  public void doPost (HttpServletRequest req, 
                     HttpServletResponse res)
          throws ServletException, IOException{
  res.setContentType("text/html");
  HtmlWrapper W=new HtmlWrapper(res.getWriter());
  HttpSession sess=req.getSession(true);
  lg=new Logger(); 
  try{
    Env E=new Env(req);
    String S=E.getStr("n","0");
    int n=Integer.parseInt(S);
lg.logIt("FactCacheServlet.doPost: S="+S+"; n="+n);
    FactCache fact=(FactCache)FactCache.getInstance();
    W.wrapPage("factorial of "+n,fact.fact(n).toString());
    }catch(Exception ex){
      W.wrapPage("Fact.doPost failure",""+Logger.stackTrace(ex));}
  }

}