5.5 购物车 - 删除商品业务讲解

在 foodie-dev-api 模块中完善 ShopcartController 类，添加 del 方法

package com.imooc.controller;
import com.imooc.pojo.bo.ShopcartBO;
import com.imooc.utils.IMOOCJSONResult;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.apache.commons.lang3.StringUtils;
import org.springframework.web.bind.annotation.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
 * @author 92578
 * @since 1.0
 */
@Api(value = "购物车接口 controller", tags = {"购物车接口相关的 api"})
@RequestMapping("shopcart")
@RestController
public class ShopcartController {
    @ApiOperation(value = "添加商品到购物车", notes = "添加商品到购物车", httpMethod = "POST")
    @PostMapping("/add")
    public IMOOCJSONResult add(@RequestParam String userId,
                               @RequestBody ShopcartBO shopcartBO,
                               HttpServletRequest request,
                               HttpServletResponse response) {
        if (StringUtils.isBlank(userId)) {
            return IMOOCJSONResult.errorMsg("");
        }
        System.out.println(shopcartBO);
        // TODO 前端用户在登录的情况下，添加商品到购物车，会同时在后端同步购物车到 redis 缓存
        return IMOOCJSONResult.ok();
    }
    @ApiOperation(value = "从购物车中删除商品", notes = "从购物车中删除商品", httpMethod = "POST")
    @PostMapping("/del")
    public IMOOCJSONResult del(@RequestParam String userId,
                               @RequestBody String itemSpecId,
                               HttpServletRequest request,
                               HttpServletResponse response) {
        if (StringUtils.isBlank(userId)) {
            return IMOOCJSONResult.errorMsg("参数不能为空");
        }
        // TODO 用户在页面删除购物车中的商品数据，如果此时用户已经登录，则x需要同步删除后端购物车中的商品
        return IMOOCJSONResult.ok();
    }
}

启动项目，访问 http://localhost:8080/foodie-shop/index.html
登录账号“imooc”，密码“123123”，随便添加几样商品到购物车，进入购物车页面，点击删除，商品删除成功


同时选中两样商品，删除其中一项观察结果，发现结算金额经过重新计算