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@@ -0,0 +1,440 @@
+
+
+```java
+
+package bean;
+
+public class Brand {
+    private int brandId;
+    private String brandName;public Brand() {
+}
+
+public Brand(int brandId, String brandName) {
+    this.brandId = brandId;
+    this.brandName = brandName;
+}
+
+public int getBrandId() {
+    return brandId;
+}
+
+public void setBrandId(int brandId) {
+    this.brandId = brandId;
+}
+
+public String getBrandName() {
+    return brandName;
+}
+
+public void setBrandName(String brandName) {
+    this.brandName = brandName;
+}
+
+@Override
+public String toString() {
+    return "Brand{" +
+            "brandId=" + brandId +
+            ", brandName='" + brandName + '\'' +
+            '}';
+}
+```
+}
+```java
+
+package bean;
+
+import java.util.Date;
+
+public class CarDetail {
+    private int cId;
+    private String cName;
+    private String content;
+    private Date lTime;
+    private int price;
+    private int BrandID;
+    private String brandName;
+
+    public CarDetail() {
+    }
+
+    public CarDetail(int cId, String cName, String content, Date lTime, int price, int brandID, String brandName) {
+        this.cId = cId;
+        this.cName = cName;
+        this.content = content;
+        this.lTime = lTime;
+        this.price = price;
+        BrandID = brandID;
+        this.brandName = brandName;
+    }
+
+    public int getcId() {
+        return cId;
+    }
+
+    public void setcId(int cId) {
+        this.cId = cId;
+    }
+
+    public String getcName() {
+        return cName;
+    }
+
+    public void setcName(String cName) {
+        this.cName = cName;
+    }
+
+    public String getContent() {
+        return content;
+    }
+
+    public void setContent(String content) {
+        this.content = content;
+    }
+
+    public Date getlTime() {
+        return lTime;
+    }
+
+    public void setlTime(Date lTime) {
+        this.lTime = lTime;
+    }
+
+    public int getPrice() {
+        return price;
+    }
+
+    public void setPrice(int price) {
+        this.price = price;
+    }
+
+    public int getBrandID() {
+        return BrandID;
+    }
+
+    public void setBrandID(int brandID) {
+        BrandID = brandID;
+    }
+
+    public String getBrandName() {
+        return brandName;
+    }
+
+    public void setBrandName(String brandName) {
+        this.brandName = brandName;
+    }
+
+    @Override
+    public String toString() {
+        return "CarDetail{" +
+                "cId=" + cId +
+                ", cName='" + cName + '\'' +
+                ", content='" + content + '\'' +
+                ", lTime=" + lTime +
+                ", price=" + price +
+                ", BrandID=" + BrandID +
+                ", brandName='" + brandName + '\'' +
+                '}';
+    }
+}
+```
+
+```java
+package utils;
+
+import java.sql.*;
+
+public class DBUtil {
+    private static final String URL="jdbc:mysql:///CarInfo?characterEncoding=utf-8&useSSL=false&useUnicode=true";
+    private static final String USER="root";
+    private static final String PWD="root";
+
+    static {
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+        } catch (ClassNotFoundException e) {
+            System.out.println("驱动注册失败");
+            e.printStackTrace();
+        }
+    }
+
+    public static Connection getConn() throws SQLException {
+        Connection conn = DriverManager.getConnection(URL, USER, PWD);
+        return conn;
+    }
+
+    public static ResultSet query(String sql,Object... keys){
+        ResultSet rs = null;
+        try {
+            Connection conn = getConn();
+            PreparedStatement pst = conn.prepareStatement(sql);
+            for (int i = 0; i < keys.length; i++) {
+                pst.setObject((i+1),keys[i]);
+            }
+            rs = pst.executeQuery();
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+        return rs;
+    }
+
+    public static int update(String sql,Object... keys){
+        int num= 0;
+        try {
+            Connection conn = getConn();
+            PreparedStatement pst = conn.prepareStatement(sql);
+            for (int i = 0; i < keys.length; i++) {
+                pst.setObject((i+1),keys[i]);
+            }
+            num = pst.executeUpdate();
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+        return num;
+    }
+}
+```
+
+```java
+package dao;
+
+import bean.CarDetail;
+import utils.DBUtil;
+
+import java.sql.Date;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+
+public class CarDao {
+    public ArrayList<CarDetail> getAllCar(){
+        ArrayList<CarDetail> list = new ArrayList<>();
+        String sql="select * from CarDetail c,brand b where c.brandId=b.brandId";
+        ResultSet rs = DBUtil.query(sql);
+        try {
+            while (rs.next()){
+                int cid = rs.getInt("cid");
+                String cname = rs.getString("cname");
+                String content = rs.getString("content");
+                Date ltime = rs.getDate("ltime");
+                int price = rs.getInt("price");
+                int brandid = rs.getInt("brandid");
+                String brandName = rs.getString("brandname");
+                CarDetail car = new CarDetail(cid, cname, content, ltime, price, brandid,brandName);
+                list.add(car);
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+        return list;
+    }
+
+    public int addCar(CarDetail car){
+        String sql="insert into CarDetail values(?,?,?,?,?,?)";
+        int i = DBUtil.update(sql,car.getcId(),car.getcName(),car.getContent(),car.getlTime(),car.getPrice(),car.getBrandID());
+        return i;
+    }
+}
+```
+
+```java
+package dao;
+
+import bean.Brand;
+import utils.DBUtil;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+
+public class BrandDao {
+    public  ArrayList<Brand>  getAllBrand(){
+        String sql="select * from brand";
+        ResultSet rs = DBUtil.query(sql);
+        ArrayList<Brand> list = new ArrayList<>();
+        try {
+            while (rs.next()){
+                int id = rs.getInt(1);
+                String name = rs.getString(2);
+                Brand brand = new Brand(id, name);
+                list.add(brand);
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+        return list;
+    }
+}
+```
+
+```java
+package servlet;
+
+import bean.Brand;
+import bean.CarDetail;
+import dao.BrandDao;
+import dao.CarDao;
+
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Date;
+
+@WebServlet("/car/*")
+public class CarController extends HttpServlet {
+    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        request.setCharacterEncoding("utf-8");
+        response.setContentType("text/html;charset=utf-8");
+        String path=request.getPathInfo();
+        if(path.equals("/save")){
+            String name = request.getParameter("name");
+            int brandid = Integer.parseInt(request.getParameter("brandid"));
+            String content = request.getParameter("content");
+            int price = Integer.parseInt(request.getParameter("price"));
+            String date= request.getParameter("date");
+            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
+            Date newDate = null;
+            try {
+                newDate = simpleDateFormat.parse(date);
+            } catch (ParseException e) {
+                e.printStackTrace();
+            }
+            CarDetail car = new CarDetail(0, name, content, newDate, price, brandid, null);
+            int i = new CarDao().addCar(car);
+            if(i>0){
+                //response.sendRedirect("/car");
+                request.setAttribute("msg","添加成功");
+                request.getRequestDispatcher("/WEB-INF/msg.jsp").forward(request,response);
+            }else{
+                request.setAttribute("msg","添加失败");
+                request.getRequestDispatcher("/WEB-INF/msg.jsp").forward(request,response);
+            }
+        }
+
+    }
+
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        request.setCharacterEncoding("utf-8");
+        response.setContentType("text/html;charset=utf-8");
+        String path=request.getPathInfo();
+        if(path==null || path.equals("/")){
+            ArrayList<CarDetail> list = new CarDao().getAllCar();
+            request.setAttribute("list",list);
+            request.getRequestDispatcher("/WEB-INF/carList.jsp").forward(request,response);
+        }else if(path.equals("/add")){
+            ArrayList<Brand> list = new BrandDao().getAllBrand();
+            request.setAttribute("list",list);
+            request.getRequestDispatcher("/WEB-INF/form.jsp").forward(request,response);
+        }
+    }
+}
+```
+
+```jsp
+<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
+<%--
+  Created by IntelliJ IDEA.
+  User: Administrator
+  Date: 2023/6/3
+  Time: 11:08
+  To change this template use File | Settings | File Templates.
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+<head>
+    <title>Title</title>
+</head>
+<body>
+   <a href="/car/add"><button>添加</button></a>
+   <hr>
+   <table border="1">
+        <tr>
+            <th>序号</th>
+            <th>车辆名称</th>
+            <th>所属品牌</th>
+            <th>车辆简介</th>
+            <th>价格</th>
+            <th>录入时间</th>
+        </tr>
+   <c:forEach items="${list}" var="car">
+        <tr>
+            <td>${car.cId}</td>
+            <td>${car.cName}</td>
+            <td>${car.brandName}</td>
+            <td>${car.content}</td>
+            <td>${car.price}</td>
+            <td>${car.lTime}</td>
+        </tr>
+   </c:forEach>
+   </table>
+</body>
+</html>
+```
+
+```jsp
+<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
+<%--
+  Created by IntelliJ IDEA.
+  User: Administrator
+  Date: 2023/6/3
+  Time: 14:24
+  To change this template use File | Settings | File Templates.
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+<head>
+    <title>添加</title>
+</head>
+<body>
+    <form action="/car/save" method="post">
+        <table>
+            <tr>
+                <th>车辆名称</th>
+                <td><input type="text" name="name" required></td>
+            </tr>
+            <tr>
+                <th>所属品牌</th>
+                <td>
+                    <select name="brandid" id="" required>
+                        <option value="">请选择</option>
+                        <c:forEach items="${list}" var="brand">
+                        <option value="${brand.brandId}">${brand.brandName}</option>
+                        </c:forEach>
+                    </select>
+            </tr>
+            <tr>
+                <th>车辆简介</th>
+                <td><input type="text" name="content" required></td>
+            </tr>
+            <tr>
+                <th>价格</th>
+                <td><input type="text" name="price" required></td>
+            </tr>
+            <tr>
+                <th>录入时间</th>
+                <td><input type="date" name="date" required></td>
+            </tr>
+            <tr>
+                <td><input type="submit" value="确定"></td>
+            </tr>
+        </table>
+    </form>
+</body>
+</html>
+```
+
+```jsp
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+<head>
+    <title>提示信息</title>
+</head>
+<body>
+    <h1>${msg}</h1>
+</body>
+</html>
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