老师为啥CartController里面获取不到session的值，登陆后访问CartController的任何一个方法，都返回用户未登录，

来源：9-6 购物车模块所有功能自测

Java课代表

2018-12-29

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Java课代表

提问者

2018-12-29

package com.mmall.controller.portal;

import com.mmall.common.Const;
import com.mmall.common.ResponseCode;
import com.mmall.common.ServerResponse;
import com.mmall.pojo.User;
import com.mmall.service.ICartService;
import com.mmall.vo.CartVo;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

@Controller
@RequestMapping("/cart")
public class CartController {
    Logger logger = LoggerFactory.getLogger(CartController.class);
    @Resource
    private ICartService iCartService;

    /**
     * 查看当前用户的购物车商品
     * @param session
     * @return
     */
    @RequestMapping("list.do")
    @ResponseBody
    public ServerResponse<CartVo> list(HttpSession session){
        User user=(User)session.getAttribute(Const.CURRENT_USER);
        if(user==null){
            return ServerResponse.createByErrorCodeMessage(ResponseCode.NEED_LOGIN.getCode(),ResponseCode.NEED_LOGIN.getDesc());
        }
        return iCartService.list(user.getId()) ;
    }

    /**
     * 新增购物车商品
     * @param session
     * @param count
     * @param productId
     * @return
     */
    @RequestMapping("add.do")
    @ResponseBody
    public ServerResponse<CartVo> add(HttpSession session, Integer productId, Integer count){
        User user=(User)session.getAttribute(Const.CURRENT_USER);

        if(user==null){
            return ServerResponse.createByErrorCodeMessage(ResponseCode.NEED_LOGIN.getCode(),"用户未登录，请以管理员账号登录");
        }
        return iCartService.add(user.getId(),productId,count);
    }

    /**
     * 更新购物车商品的数量
     * @param session
     * @param count
     * @param productId
     * @return
     */
    @RequestMapping("update.do")
    @ResponseBody
    public ServerResponse<CartVo> update(HttpSession session, Integer count, Integer productId){
        User user=(User)session.getAttribute(Const.CURRENT_USER);
        if(user==null){
            return ServerResponse.createByErrorCodeMessage(ResponseCode.NEED_LOGIN.getCode(),ResponseCode.NEED_LOGIN.getDesc());
        }
        return iCartService.update(user.getId(),productId,count);
    }

    /**
     * 删除购物车中的产品
     * @param session
     * @param productIds
     * @return
     */
    @RequestMapping("delete_product.do")
    @ResponseBody
    public ServerResponse<CartVo> deleteProduct(HttpSession session, String productIds){
        User user=(User)session.getAttribute(Const.CURRENT_USER);
        if(user==null){
            return ServerResponse.createByErrorCodeMessage(ResponseCode.NEED_LOGIN.getCode(),ResponseCode.NEED_LOGIN.getDesc());
        }
        return iCartService.deleteProduct(user.getId(),productIds);
    }

    //全选
    @RequestMapping("select_all.do")
    @ResponseBody
    public ServerResponse<CartVo> selectAll(HttpSession session){
        User user=(User)session.getAttribute(Const.CURRENT_USER);
        if(user==null){
            return ServerResponse.createByErrorCodeMessage(ResponseCode.NEED_LOGIN.getCode(),ResponseCode.NEED_LOGIN.getDesc());
        }
        return iCartService.selectOrUnSelect(user.getId(),null,Const.Cart.CHECKED);
    }

    //全反选
    @RequestMapping("un_select_all.do")
    @ResponseBody
    public ServerResponse<CartVo> unSelectAll(HttpSession session){
        User user=(User)session.getAttribute(Const.CURRENT_USER);
        if(user==null){
            return ServerResponse.createByErrorCodeMessage(ResponseCode.NEED_LOGIN.getCode(),ResponseCode.NEED_LOGIN.getDesc());
        }
        return iCartService.selectOrUnSelect(user.getId(),null,Const.Cart.UN_CHECKED);
    }

    //单选
    @RequestMapping("select.do")
    @ResponseBody
    public ServerResponse<CartVo> Select(HttpSession session,Integer productId){
        User user=(User)session.getAttribute(Const.CURRENT_USER);
        if(user==null){
            return ServerResponse.createByErrorCodeMessage(ResponseCode.NEED_LOGIN.getCode(),ResponseCode.NEED_LOGIN.getDesc());
        }
        return iCartService.selectOrUnSelect(user.getId(),null,Const.Cart.CHECKED);
    }

    //单反选
    @RequestMapping("un_select.do")
    @ResponseBody
    public ServerResponse<CartVo> unSelect(HttpSession session,Integer productId){
        User user=(User)session.getAttribute(Const.CURRENT_USER);
        if(user==null){
            return ServerResponse.createByErrorCodeMessage(ResponseCode.NEED_LOGIN.getCode(),ResponseCode.NEED_LOGIN.getDesc());
        }
        return iCartService.selectOrUnSelect(user.getId(),productId,Const.Cart.UN_CHECKED);
    }

    /**
     * 购物车商品数量
     * @param session
     * @param productId
     * @return
     */
    @RequestMapping("get_cart_product_count.do")
    @ResponseBody
    public ServerResponse<Integer> getCartProductCount(HttpSession session,Integer productId){
        User user=(User)session.getAttribute(Const.CURRENT_USER);
        if(user==null){
            return ServerResponse.createBySuccess(0);
        }
        return iCartService.getCartProductCount(user.getId());
    }
}