pjr4z27u5/src/main/java/ShopCar/ShopCartServlet.java

package ShopCar;

import Connect.Connect;
import JavaBean.Shopcar;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.query.Query;

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 java.io.IOException;
import java.util.Iterator;
import java.util.List;

public class ShopCartServlet extends HttpServlet {
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        if(req.getServletPath().equals("/addBook.do")){
            addBook(req, resp);
        }else if(req.getServletPath().equals("/deleteBook.do")){
            deleteBook(req, resp);
        }else if(req.getServletPath().equals("/showCart.do")){
            showShopcar(req,resp);
        }
    }
    private void showShopcar(HttpServletRequest req, HttpServletResponse resp) {
        HttpSession session=req.getSession();
        Object obj=session.getAttribute("userID");
        int userId = 0;
        if(obj!=null) {
            userId = (int) obj;
            System.out.println("userID是"+userId);
        }
        Session hSession=Connect.getConfig();
        Transaction tx=hSession.beginTransaction();
        String hql = "FROM Shopcar WHERE userId=:userid";
        Query query = hSession.createQuery(hql);
        query.setParameter("userid",userId);
        tx.commit();
        List results = query.list();
        System.out.println("购物车中一共有"+results.size());
        Iterator it=results.iterator();
        while(it.hasNext()){
            Shopcar shopcar= (Shopcar) it.next();
            System.out.println("Bookid"+shopcar.getBookid());
            System.out.println("Itemid"+shopcar.getItemid());
            System.out.println("useid"+shopcar.getUserId());
        }
    }
    private void addBook(HttpServletRequest req, HttpServletResponse resp){
        HttpSession session=req.getSession();
        Object obj=session.getAttribute("userID");
        int bookID=10;
        int userId = 0;
        if(obj!=null) {
            userId = (int) obj;
            System.out.println("userID是"+userId);
        }
        Session hSession= Connect.getConfig();
        if(userId!=0) {
            System.out.println(" this is ");
            Transaction tx=hSession.beginTransaction();
            Shopcar shopCar=new Shopcar();
            shopCar.setUserId(userId);
            shopCar.setBookid(bookID);
            shopCar.setNumber(10);
            hSession.save(shopCar);
            tx.commit();
        }
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("程序执行到这里了");
        String bookid=req.getParameter("bookid");
        System.out.println(bookid);
        doPost(req, resp);
    }

    private void deleteBook(HttpServletRequest req,HttpServletResponse resp){
        HttpSession session=req.getSession();
        Object obj=session.getAttribute("userID");
        int bookID=10;
        int userId = 0;
        if(obj!=null) {
            userId = (int) obj;
            System.out.println("userID是"+userId);
        }
        Session hSession= Connect.getConfig();
        if(userId!=0) {
            Transaction tx1=hSession.beginTransaction();
            String hql = "FROM Shopcar WHERE bookid=:bookid AND userId=:userid";
            Query query = hSession.createQuery(hql);
            query.setParameter("bookid",bookID);
            query.setParameter("userid",userId);
            List results = query.list();
            tx1.commit();
            if(results.size()>0){
                Transaction tx2=hSession.beginTransaction();
                Shopcar deleteItem= (Shopcar) results.get(0);
                hSession.delete(deleteItem);
                tx2.commit();
            }else{
                System.out.println("无法删除");
            }
        }
    }
}