求解决
试了很多种方法 都不可以
HandleMenu_Servlet.java
package handle.data;
import save.data.Food;
import save.data.MenuBean;
import java.util.*;
import java.io.*;
import java.time.LocalTime;
import javax.servlet.*;
import javax.servlet.http.*;
public class HandleMenu_Servlet extends HttpServlet{
public void init(ServletConfig config) throws ServletException{
super.init(config);
}
public void service(HttpServletRequest request,
HttpServletResponse response)throws ServletException,IOException{
request.setCharacterEncoding("utf-8");
MenuBean menu=null;//餐单
HttpSession session=request.getSession(true);
menu=(MenuBean)session.getAttribute("menu");
if(menu==null){//menu不存在就创建menu
menu=new MenuBean();
session.setAttribute("menu",menu);//session bean
}
String foodName=request.getParameter("foodName");//食物名称
String price=request.getParameter("price");
Food food=new Food();
if(foodName.length()==0||price.length()==0){
response.sendRedirect("inputMenu.jsp");
return;
}
food.setFoodName(foodName);
food.setPrice(Double.parseDouble(price));
LocalTime dataTime=LocalTime.now();
String str=dateTime.toString();
tring time=str.substring(0,str.lastIndexof("."));//不要纳秒
menu.setTime(time);
menu.addFood(food);//添加一道食物
response.sendRedirect("showMenu.jsp");//显示餐单
}
}
