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

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package com.hwua.erhai.controller;

import com.hwua.erhai.common.PageNavUtil;
import com.hwua.erhai.dao.ICarDao;
import com.hwua.erhai.dao.impl.CarDaoImpl;
import com.hwua.erhai.entity.Car;
import com.hwua.erhai.model.MCar;
import com.hwua.erhai.model.MCarSearch;
import com.hwua.erhai.model.MPageNav;
import com.hwua.erhai.model.MUser;
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 = "CarListServlet", value = "/carList")
public class CarListServlet extends HttpServlet {
    ICarService carService = new MockCarService();
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //从客户端请求里，读取出与汽车查询条件相关的参数
        String carId = request.getParameter("carId");
        String carBrand = request.getParameter("carBrand");
        String carCategory = request.getParameter("carCategory");
        String priceOrder = request.getParameter("priceOrder");
    //从客户端请求里，读取出与汽车查询条件相同的参数
        //page代表查询的是第几个分页从1开始
        //pageSize代表的是每个分页的记录行数
        String page = request.getParameter("page");
        String pageSize = request.getParameter("pageSize");
        //根据汽车查询条件的参数，生成分页的基准url，也就是超链接的值
        //这个baseUrl会用于生成分页导航中的a标签的href属性，也就是超链接的值
        //同时，还会生成数据库SQL查询的条件清单，也就是超链接的值

        List<String> params = new ArrayList<>();
        List<QueryCondition> queryConditions = new ArrayList<>();
        if (StringUtils.isNotEmpty(carId)) {
            params.add(String.format("carId=%s", carId));
            queryConditions.add(new QueryCondition("carId", carId));
        }
        if (StringUtils.isNotEmpty(carBrand)) {
            params.add(String.format("carBrand=%s", carBrand));
            queryConditions.add(new QueryCondition("carBrand", carBrand));
        }
        if (StringUtils.isNotEmpty(carCategory)) {
            params.add(String.format("carCategory=%s", carCategory));
            queryConditions.add(new QueryCondition("carCategory", carCategory));
        }
        if (StringUtils.isNotEmpty(priceOrder)) {
            params.add(String.format("priceOrder=%s", priceOrder));
            queryConditions.add(new QueryCondition("priceOrder", priceOrder));
        }