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

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package com.hwua.erhai.controller;

import com.hwua.erhai.entity.Car;
import com.hwua.erhai.model.MCar;
import com.hwua.erhai.service.ICarService;
import com.hwua.erhai.service.impl.MockCarService;
import com.hwua.erhai.service.query.QueryCondition;

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 = "RentCarServlet", value = "/rentCar")
public class RentCarServlet extends HttpServlet {

    ICarService carService = new MockCarService();

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String carId = request.getParameter("carId");
        List<QueryCondition> queryConditionList = new ArrayList<>();
        queryConditionList.add(new QueryCondition("carId",carId));

        List<Car> carList = carService.queryCars(queryConditionList,1,0);

        if (carList ==null||carList.size()==0){
            request.setAttribute("message","找不到该汽车");
            request.getRequestDispatcher("/carFoundError.jsp").forward(request,response);
            return;
        }
        if (carList.size()>1){
            request.setAttribute("massage","找到多辆汽车");
            request.getRequestDispatcher("/carFoundError.jsp").forward(request,response);
            return;
        }

        Car car = carList.get(0);
        MCar mCar = new MCar();
        mCar.setId(String.valueOf(car.getId()));
        mCar.setBrand(String.valueOf(car.getBrandName()));
        mCar.setCategory(String.valueOf(car.getCategoryName()));
        mCar.setModel(String.valueOf(car.getModel()));
        mCar.setCarNumber(String.valueOf(car.getCarNumber()));
        mCar.setColor(String.valueOf(car.getColor()));
        mCar.setComments(String.valueOf(car.getComments()));

        mCar.setPrice(String.valueOf(car.getPrice()));
        mCar.setRent(String.format("%.2f",car.getRent()));

        mCar.setImagePath(String.format("upload/car_%d.img",car.getId()));
        mCar.setImagePath(String.format("upload/car_%d.img?t=%d",car.getId(),System.currentTimeMillis()));

        request.setAttribute("mCar",mCar);
        request.getRequestDispatcher("/rentCar.jsp").forward(request,response);
    }