buymp3servlet.java

运用jsp/servlet技术 通过bs方式 在网上购买MP3

package com.servlet;

import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.Map;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.dto.Mp3;
import com.sun.org.apache.commons.beanutils.BeanUtils;

public class BuyMp3Servlet extends HttpServlet {

	
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
         HttpSession session=request.getSession();
         ServletContext sc=getServletContext();
         Map<String,Mp3>   mp3List=(Map<String,Mp3>)sc.getAttribute("mp3List");
         
         Map<String,Mp3> buyMp3List=(Map<String,Mp3>) session.getAttribute("buyMp3List");
         String mp3No=request.getParameter("mp3No");
         Mp3 buyMp3=mp3List.get(mp3No);
         Mp3 copyMp3=new Mp3();
         try {
   			BeanUtils.copyProperties(copyMp3, buyMp3);
   		} catch (IllegalAccessException e) {
   			// TODO Auto-generated catch block
   			e.printStackTrace();
   		} catch (InvocationTargetException e) {
   			// TODO Auto-generated catch block
   			e.printStackTrace();
   		}
		
		if(buyMp3List!=null){
			
			if(buyMp3List.containsKey(mp3No)){
			Mp3 m=buyMp3List.get(mp3No);
			int sum=Integer.parseInt(m.getBuyNo())+1;
			 copyMp3.setBuyNo(sum+"");
			}
			else{
				copyMp3.setBuyNo("1");
			}
			buyMp3List.put(mp3No, copyMp3);
		}
		else{
			System.out.println("你还没有购买任何mp3");
		}
         

		response.sendRedirect("../jsp/BuyMp3List.jsp");
	}

	
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		doGet(request,response);
	}

}