addbasketcontroller.java

java实现的小型购物平台,虽然简单

package LL;
import  LL.LibraryBasket;

import javax.servlet.RequestDispatcher;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class AddBasketController extends HttpServlet{


public void doPost(HttpServletRequest request,HttpServletResponse response){
	
	try {
		HttpSession mySession=request.getSession();
	
	/**Load the myBasket bean from the HtttpSession.
	 *This returns a copy of the object in the session
	 */
	LibraryBasket myBasket=(LibraryBasket) mySession.getAttribute("myBasket");
	LibraryBooks libraryBooks=(LibraryBooks) mySession.getAttribute("libraryBooks");
	
	/**
	 * process the requst from the jsp
	 */
	String titles[]=request.getParameterValues("title");//选中的书名
	//System.out.println(titles.length);
	String lTitles[]=libraryBooks.getBookTitle();//所有书名
	String bookIsbns[]=libraryBooks.getBookIsbn();//所有书对应的书isbn
	
	
	if(titles!=null){
	  	
		//for (int k=0;k<titles.length;k++)
	//	System.out.println("title"+" "+titles[k]+" 书名结束了 ");
	
	

	/**
	 * 对每一个书名,在所有书中查找,找到后,用对应的书isbn来在cart里加一个记录
	 */
	for(int i=0;i<titles.length;i++){
	     for(int j=0;j<bookIsbns.length;j++)
	    if(titles[i].equals(lTitles[j])){
		myBasket.addItem(bookIsbns[j]);
	    }
	}
	
	}else{
		
	System.out.println("please choose some books");
		
	}
	/**
	 *  Set the bean back into the session for later use. This
	 * method will associate the myBasket bean with the name "myBasket"
	 */

	mySession.setAttribute("myBasket",myBasket);
	
	/**
	 * back to the main page
	 */
	
	
	RequestDispatcher rd;
	rd=getServletContext().getRequestDispatcher("/showbooks.jsp");
	rd.forward(request, response);
	//System.out.println("come here already ^_^");//&@@@@@@@@@@@@@@
	
	}catch(Exception e){
	  System.out.println(e.toString());	
	}
}
}