deleteoneaction.java

一个购物网站

package shoppingCar;

import java.io.*;
import java.lang.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class DeleteOneAction extends HttpServlet{
	
	ArrayList goodsArraylist=null;
	Hashtable goodsHashtable=null;
	String goodId;		//要删除的物品的Id号
	int singleCount=0;		//购物车内某一种物品的数量
	boolean deleteFlag=false;

	/**
	 *doGet
	 */	
	public void doGet(HttpServletRequest request,HttpServletResponse response)
	   throws IOException,ServletException{
	   	try{
	   		goodId=request.getParameter("goodId");
	   		int i;
	 	  	goodsArraylist=(ArrayList)(request.getSession().getAttribute("goods"));
	 	  	for(i=0;i<goodsArraylist.size();i++){
	 	 		goodsHashtable=(Hashtable)goodsArraylist.get(i);
	 			if( ((String)goodsHashtable.get("goodId")).equals(goodId)){
	 				singleCount=Integer.parseInt(goodsHashtable.get("tradeTimes").toString());
	 				if(singleCount>1){		//数量大于一
	 			 		goodsHashtable.put("tradeTimes",--singleCount);
	 	  				goodsArraylist.set(i,goodsHashtable);
	  					request.getSession().setAttribute("goods",goodsArraylist);
	 					deleteFlag=true;
	 				}else{
				 		goodsArraylist.remove(i);
	  					request.getSession().setAttribute("goods",goodsArraylist);		
	 					deleteFlag=true;
	 			 	}
	 			 	System.out.println(deleteFlag);	
	 			 	break;
	 		 	}	
	 	 	}
	 	 	if(i==goodsArraylist.size()){
	 	 		
	 	 	}
		 	 	try{
		 	 		if(deleteFlag){
		   			getServletConfig().getServletContext().getRequestDispatcher
					("/shoppingCar.jsp").forward(request,response);
					}	 	 		
		 	 	}catch(Exception exc){
		 	 		System.out.println("zhuan fa dao shoppingCar.jsp chu cuo le!!!");
		 	 	}
	
	   	}catch(Exception e){
	   		System.out.println("Deleting one good Exception!");
	   	}
	}
	
	/**
	 *doPost
	 */	
	public void doPost(HttpServletRequest request,HttpServletResponse response)
	   throws IOException,ServletException
	{
		doGet( request, response);
	}
}