src/main/java/com/hwua/erhai/controller/DoCarUpdateUsableServlet.java

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package com.hwua.erhai.controller;

import com.hwua.erhai.entity.Car;
import com.hwua.erhai.service.ICarService;
import com.hwua.erhai.service.impl.MockCarService;
import com.hwua.erhai.service.query.QueryCondition;
import org.apache.commons.lang3.StringUtils;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

@WebServlet(name = "DoCarUpdateUsableServlet", value = "/doCarUpdateUsable")
public class DoCarUpdateUsableServlet extends HttpServlet {
    ICarService carService = new MockCarService();
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {


    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String carId = request.getParameter("carId");
        String usable = request.getParameter("usable");
        if (StringUtils.isBlank(carId)||StringUtils.isBlank(usable)){
            response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
            response.getWriter().write("请求参数为空");
            return;
        }
        List<QueryCondition> queryConditions = new ArrayList<>();
        queryConditions.add(new QueryCondition("carId",carId));
        List<Car> carList = carService.queryCars(queryConditions,1,0);
        if (carList ==null||carList.size()==0){
            response.setStatus(HttpServletResponse.SC_NOT_FOUND);
            response.getWriter().write("找不到汽车");
            return;
        }
        if (carList.size()>1){
            response.setStatus(HttpServletResponse.SC_BAD_REQUEST);
            response.getWriter().write("找到多辆汽车");
            return;
        }
        Car car = carList.get(0);
        car.setUsable("是".equals(usable)?0:1);
        Car newCar = carService.updateAndReturnCar(car);
        if (newCar ==null){
            response.setStatus(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
            response.getWriter().write("内部服务器错误 更新汽车上下架状态失败");
            return;
        }
        response.setStatus(HttpServletResponse.SC_OK);
        response.getWriter().write("更新汽车上下架状态成功");

    }
}