bookcaraction.java

struts实现的图书管理系统,借书

package com.gton.action.user;

import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForm;
import javax.servlet.http.*;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.Action;
import com.gton.bean.*;
import com.gton.bean.db.*;
//import com.gton.tookit.*;
import java.util.*;
public class BookCarAction extends Action {
    public ActionForward execute(ActionMapping mapping, ActionForm form,
                                 HttpServletRequest request,
                                 HttpServletResponse response) {
        HttpSession session=request.getSession();
        int books_ID=Integer.parseInt(request.getParameter("books_ID"));
        if(session.getAttribute("car")==null)
        {
            ArrayList list=new ArrayList();
            session.setAttribute("car",list);
        }
        DataBean db=new DataBean();
        ArrayList list=(ArrayList) session.getAttribute("car");
      
        boolean flag=true;
        for(int i=0;i<list.size();i++)
        {
            BooksBean bsb=(BooksBean)list.get(i);
            if(books_ID==bsb.getBooks_ID())
            {
                flag=false;
                break;
            }
        }
        if(flag)
        list.add(db.getBooksBean(books_ID));
        session.setAttribute("car",list);
        db.Close();
        return mapping.findForward("car");
    }
}