chooseservlet.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.Choose;
import MyNa.utils.HtmlWrapper; // sends HTML to client.
import java.io.IOException; // thrown by HtmlWrapper
import MyNa.utils.MiscDate; // for logging.

public class ChooseServlet 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");
    String Sk=E.getStr("k","0");
    String cache=E.getStr("cache","no");
    int n=Integer.parseInt(S);
    int k=Integer.parseInt(Sk);
lg.logIt("ChooseServlet.doPost: S="+S+"; n="+n+"; Sk="+Sk+"; k="+k);
    Choose ch=(Choose)Choose.getInstance();
    String d1=(new java.util.Date()).toString();
    String val=cache.equals("yes")?ch.choose(n,k).toString()
                  :ch.choose1(n,k).toString();
    String d2=(new java.util.Date()).toString();
    W.wrapPage("given "+n+" items, choose "+k,d1+"<br>"+val+"<br>"+d2);
               
    }catch(Exception ex){
      W.wrapPage("ChooseServlet.doPost failure",""+ex);}
  }
}