diff --git "a/38 \351\273\204\346\255\243\347\204\225/20230607 \346\210\277\345\261\213\347\256\241\347\220\206.md" "b/38 \351\273\204\346\255\243\347\204\225/20230607 \346\210\277\345\261\213\347\256\241\347\220\206.md"
new file mode 100644
index 0000000000000000000000000000000000000000..0b5976b050bf6eea60cdf4a2b253898565915e6a
--- /dev/null
+++ "b/38 \351\273\204\346\255\243\347\204\225/20230607 \346\210\277\345\261\213\347\256\241\347\220\206.md"	
@@ -0,0 +1,468 @@
+```java
+//bean
+package bean;
+
+public class House_Info {
+   private int id;//编号
+    private String lease_mode;//租赁方式
+   private double rent;//租金
+   private String contacts;//联系人
+   private String deposit_method;//押金方式
+   private String house_type_id;//房屋类型id
+   private String address;//详细地址
+    private String type;//房型
+
+    public House_Info() {
+    }
+
+    public House_Info(int id, String lease_mode, double rent, String contacts, String deposit_method, String house_type_id, String address, String type) {
+        this.id = id;
+        this.lease_mode = lease_mode;
+        this.rent = rent;
+        this.contacts = contacts;
+        this.deposit_method = deposit_method;
+        this.house_type_id = house_type_id;
+        this.address = address;
+        this.type = type;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getLease_mode() {
+        return lease_mode;
+    }
+
+    public void setLease_mode(String lease_mode) {
+        this.lease_mode = lease_mode;
+    }
+
+    public double getRent() {
+        return rent;
+    }
+
+    public void setRent(double rent) {
+        this.rent = rent;
+    }
+
+    public String getContacts() {
+        return contacts;
+    }
+
+    public void setContacts(String contacts) {
+        this.contacts = contacts;
+    }
+
+    public String getDeposit_method() {
+        return deposit_method;
+    }
+
+    public void setDeposit_method(String deposit_method) {
+        this.deposit_method = deposit_method;
+    }
+
+    public int getHouse_type_id() {
+        return house_type_id;
+    }
+
+    public void setHouse_type_id(String house_type_id) {
+        this.house_type_id = house_type_id;
+    }
+
+    public String getAddress() {
+        return address;
+    }
+
+    public void setAddress(String address) {
+        this.address = address;
+    }
+
+    public String getType() {
+        return type;
+    }
+
+    public void setType(String type) {
+        this.type = type;
+    }
+
+    @Override
+    public String toString() {
+        return "House_Info{" +
+                "id=" + id +
+                ", lease_mode='" + lease_mode + '\'' +
+                ", rent=" + rent +
+                ", contacts='" + contacts + '\'' +
+                ", deposit_method='" + deposit_method + '\'' +
+                ", house_type_id=" + house_type_id +
+                ", address='" + address + '\'' +
+                ", type='" + type + '\'' +
+                '}';
+    }
+}
+
+package bean;
+
+public class House_Type {
+    private int id; //房型id
+    private String type; //房型
+
+    public House_Type() {
+    }
+
+    public House_Type(int id, String type) {
+        this.id = id;
+        this.type = type;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getType() {
+        return type;
+    }
+
+    public void setType(String type) {
+        this.type = type;
+    }
+
+    @Override
+    public String toString() {
+        return "House_Type{" +
+                "id=" + id +
+                ", type='" + type + '\'' +
+                '}';
+    }
+}
+
+```
+
+```java
+//servlet
+package servlet;
+
+import bean.House_Info;
+import utils.DBUtil;
+
+import javax.servlet.*;
+import javax.servlet.http.*;
+import javax.servlet.annotation.*;
+import java.io.IOException;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+
+@WebServlet("/list")
+public class ListServlet extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+    //1编写sql语句
+        String sql= "select * from house_info i,house_type t where i.house_type_id=t.id";
+    //2 调用工具类，执行sql语句的到结果集
+        ResultSet rs = DBUtil.query(sql);
+    //3 将结果集封装到集合
+        ArrayList<House_Info> list = new ArrayList<>();
+        try {
+            while (rs.next()){
+                int iid = rs.getInt("i.id");
+                int tid = rs.getInt("t.id");
+                String mode = rs.getString("lease_mode");
+                double rent = rs.getDouble("rent");
+                String contacts = rs.getString("contacts");
+                String method = rs.getString("deposit_method");
+                String address = rs.getString("address");
+                String type = rs.getString("type");
+                House_Info info = new House_Info(iid, mode, rent, contacts, method, tid, address, type);
+                list.add(info);
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+    //4 将结果集放到request请求域中
+        request.setAttribute("list",list);
+    //5 将请求转发给list.jsp
+        request.getRequestDispatcher("/WEB-INF/list.jsp").forward(request,response);
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+
+    }
+}
+
+package servlet;
+
+import bean.House_Info;
+import bean.House_Type;
+import utils.DBUtil;
+
+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.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+
+@WebServlet("/add")
+public class AddServlet extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+    //1编写sql语句
+        String sql= "select * from house_type";
+    //2 调用工具类，执行sql语句的到结果集
+        ResultSet rs = DBUtil.query(sql);
+    //3 将结果集封装到集合
+        ArrayList<House_Type> list = new ArrayList<>();
+        try {
+            while (rs.next()){
+                int id = rs.getInt("id");
+                String type = rs.getString("type");
+                House_Type houseType = new House_Type(id,type);
+                list.add(houseType);
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+    //4 将结果集放到request请求域中
+        request.setAttribute("list",list);
+    //5 将请求转发给list.jsp
+        request.getRequestDispatcher("/WEB-INF/add.jsp").forward(request,response);
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        // 表单是以post方式提交到/add的
+        //1处理乱码
+        request.setCharacterEncoding("utf-8");
+        response.setContentType("text/html;charset=utf-8");
+        //2接收表单数据
+        String mode = request.getParameter("lease_mode");
+        String rent = request.getParameter("rent");
+        String contacts = request.getParameter("contacts");
+        String deposit_method = request.getParameter("deposit_method");
+        String type = request.getParameter("type");
+        String address = request.getParameter("address");
+        //3编写添加数据库的sql
+        String sql ="insert into house_info values (0,?,?,?,?,?,?)";
+        //4调用工具类，执行sql，并传入表单数据
+        int i = DBUtil.update(sql,mode,rent,contacts,deposit_method,type,address);
+        //5根据执行结果显示提示信息
+        if (i>0){
+            response.sendRedirect("/list");//添加成功，返回list
+        }else {
+            //添加失败的话，就在request域中添加一个msg属性
+            request.setAttribute("msg","添加失败");
+            //请求转发给msg.jsp，让他显示添加失败的信息.
+            request.getRequestDispatcher("WEB-INF/msg.jsp").forward(request,response);
+        }
+
+
+
+    }
+}
+
+```
+
+```java
+//util
+package utils;
+
+import java.sql.*;
+
+public class DBUtil {
+    //1连接数据库
+    static String url="jdbc:mysql:///test?characterEncoding=utf8";
+    static String user="root";
+    static String pwd="root";
+    //2注册驱动
+    static {
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        }
+    }
+    //3获取连接
+    public static Connection getCoon() throws SQLException {
+        Connection conn = DriverManager.getConnection(url, user, pwd);
+        return conn;
+    }
+    //4通用的query 接收sql，返回结果集
+    public static ResultSet query(String sql,Object... keys)  {
+        ResultSet rst = null;
+        try {
+            //取连接
+            Connection coon = getCoon();
+            //取执行sql语句对象
+            PreparedStatement pst = coon.prepareStatement(sql);
+            //遍历keys[i] 给？赋值
+            for (int i = 0; i < keys.length; i++) {
+                pst.setObject((i+1),keys[i]);
+
+            }
+            //执行sql，得到结果集
+            rst = pst.executeQuery();
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+        //返回结果集
+        return rst;
+    }
+    //5通用的update 接收sql，返回受影响行数
+    public static int update(String sql,Object... keys)  {
+        int rst = 0;
+        try {
+            //取连接
+            Connection coon = getCoon();
+            //取执行sql语句对象
+            PreparedStatement pst = coon.prepareStatement(sql);
+            //遍历keys[i] 给？赋值
+            for (int i = 0; i < keys.length; i++) {
+                pst.setObject((i+1),keys[i]);
+
+            }
+            //执行sql，得到结果集
+            rst = pst.executeUpdate();
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+        //返回结果集
+        return rst;
+    }
+    //6关闭资源
+    public static void close(Connection conn,PreparedStatement pst,ResultSet rst) throws SQLException {
+        if (rst != null) {
+            rst.close();
+        }
+        if (pst != null) {
+            pst.close();
+        }
+        if (conn != null) {
+            conn.close();
+        }
+    }
+}
+
+```
+
+```jsp
+//add
+<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+<head>
+    <title>添加房源</title>
+</head>
+<body>
+<form action="/add" method="post">
+  <table border="1" width="500">
+    <tr>
+      <th>租赁方式</th>
+      <td><input type="text" name="lease_mode"></td>
+    </tr>
+    <tr>
+      <th>租金</th>
+      <td><input type="text" name="rent"></td>
+    </tr>
+    <tr>
+      <th>联系人</th>
+      <td><input type="text" name="contacts"></td>
+    </tr>
+    <tr>
+      <th>押金方式</th>
+      <td><input type="text" name="deposit_method"></td>
+    </tr>
+    <tr>
+      <th>房屋类型</th>
+      <td>
+        <select name="house_type_id" >
+          <c:forEach items="${list}" var="h">
+            <option value="${h.id}">${h.type}</option>
+          </c:forEach>
+
+        </select>
+      </td>
+    </tr>
+    <tr>
+      <th>详细地址</th>
+      <td><input type="text" name="address"></td>
+    </tr>
+    <tr>
+      <td colspan="2" align="right"><input type="submit" value="确定"></td>
+    </tr>
+  </table>
+</form>
+</body>
+</html>
+
+//list
+<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+<head>
+    <title>房源信息列表</title>
+</head>
+<body>
+<a href="/add"><button>添加房源</button></a>
+
+<table border="1" width="500">
+    <tr>
+        <th>编号</th>
+        <th>租赁方式</th>
+        <th>租金</th>
+        <th>联系人</th>
+        <th>押金方式</th>
+        <th>房屋类型</th>
+        <th>详细地址</th>
+    </tr>
+    <c:forEach items="${list}" var="house">
+        <tr>
+            <td>${house.id}</td>
+            <td>${house.lease_mode}</td>
+            <td>${house.rent}</td>
+            <td>${house.contacts}</td>
+            <td>${house.deposit_method}</td>
+            <td>${house.type}</td>
+            <td>${house.address}</td>
+
+        </tr>
+    </c:forEach>
+
+</table>
+</body>
+</html>
+
+//msg
+<%--
+  Created by IntelliJ IDEA.
+  User: Administrator
+  Date: 2023-06-07
+  Time: 12:42
+  To change this template use File | Settings | File Templates.
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+<head>
+    <title>提示信息</title>
+</head>
+<body>
+<h1>${msg}</h1>
+<hr>
+<a href="/list">返回列表</a>
+</body>
+</html>
+
+```
+