From 96f4e0c60b7f7a530a7694525be98382187131e2 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E7=94=98=E5=90=AF=E8=88=AA?= Date: Mon, 12 Jun 2023 21:03:54 +0800 Subject: [PATCH] zy --- ...77\345\261\213\347\256\241\347\220\206.md" | 449 ++++++++++++++++++ 1 file changed, 449 insertions(+) create mode 100644 "24 \347\224\230\345\220\257\350\210\252/\347\224\230\345\220\257\350\210\2522023 06 12\346\210\277\345\261\213\347\256\241\347\220\206.md" diff --git "a/24 \347\224\230\345\220\257\350\210\252/\347\224\230\345\220\257\350\210\2522023 06 12\346\210\277\345\261\213\347\256\241\347\220\206.md" "b/24 \347\224\230\345\220\257\350\210\252/\347\224\230\345\220\257\350\210\2522023 06 12\346\210\277\345\261\213\347\256\241\347\220\206.md" new file mode 100644 index 0000000..9446269 --- /dev/null +++ "b/24 \347\224\230\345\220\257\350\210\252/\347\224\230\345\220\257\350\210\2522023 06 12\346\210\277\345\261\213\347\256\241\347\220\206.md" @@ -0,0 +1,449 @@ +```mysql +# 数据库名称：test +create database test char set utf8; +use test; +# 表：house_type (房屋类型表) +create table house_type +( + id int primary key auto_increment, # 编号主键,自动增长列 + type varchar(50) not null # 房屋类型不允许为空 +); +insert into house_type +values (null, '两室一厅'), + (null, '三室两厅'), + (null, '一室两厅'); + +# 表：house_info (房源信息表) +# 字段显示 字段名 数据类型 默认值 备注和说明 +create table house_info +( + id int primary key auto_increment, # 编号 主键,自动增长列 + lease_mode varchar(50), # 租赁方式 可以为空 + rent double not null, # 租金不允许为空 + contacts varchar(20), # 联系人可以为空 + deposit_method varchar(20), # 押金方式可以为空 + house_type_id int, # 房屋类型外键 + address varchar(200) not null, # 详细地址 不允许为空 + foreign key (house_type_id) references house_type (id) +); +insert into house_info values + (0,'合租',800,'张三','',1,'汤臣一品'), + (0,'整租',1600,'李四','',2,'汤臣二品'), + (0,'整租',1600,'王五','',3,'汤臣三品'); +``` + +bean + +```java +package bean; + +public class HouseInfo { + private int id; + private String lease_mode; + private double rent; + private String contacts; + private String method; + private int typeId; + private String address; + private String type1; + + public HouseInfo(int id, String lease_mode, double rent, String contacts, String method, int typeId, String address, String type1) { + this.id = id; + this.lease_mode = lease_mode; + this.rent = rent; + this.contacts = contacts; + this.method = method; + this.typeId = typeId; + this.address = address; + this.type1 = type1; + } + + @Override + public String toString() { + return "HouseInfo{" + + "id=" + id + + ", lease_mode='" + lease_mode + '\'' + + ", rent=" + rent + + ", contacts='" + contacts + '\'' + + ", method='" + method + '\'' + + ", typeId=" + typeId + + ", address='" + address + '\'' + + ", type1='" + type1 + '\'' + + '}'; + } + + 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 getMethod() { + return method; + } + + public void setMethod(String method) { + this.method = method; + } + + public int getTypeId() { + return typeId; + } + + public void setTypeId(int typeId) { + this.typeId = typeId; + } + + public String getAddress() { + return address; + } + + public void setAddress(String address) { + this.address = address; + } + + public String getType1() { + return type1; + } + + public void setType1(String type1) { + this.type1 = type1; + } + + public HouseInfo() { + } +} +package bean; + +public class HouseType { + private int id; + private String type; + + public HouseType(int id, String type) { + this.id = id; + this.type = type; + } + + @Override + public String toString() { + return "HouseType{" + + "id=" + id + + ", 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; + } + + public HouseType() { + } +} +``` + +until + +```java +package utils; + +import java.sql.*; + +public class DBUtil { + private static final String url="jdbc:mysql:///test?characterEncoding=utf8"; + private static final String user="root"; + private static final String psw="root"; + + static { + try { + Class.forName("com.mysql.jdbc.Driver"); + } catch (ClassNotFoundException e) { + throw new RuntimeException(e); + } + } + + public static Connection getConn() throws SQLException { + Connection conn = DriverManager.getConnection(url, user, psw); + return conn; + } + + public static ResultSet select(String sql,Object...keys){ + try { + Connection conn = getConn(); + PreparedStatement pst= conn.prepareStatement(sql); + for (int i = 0; i < keys.length; i++) { + pst.setObject((i+1),keys[i]); + } + ResultSet rs= pst.executeQuery(); + return rs; + } catch (SQLException e) { + throw new RuntimeException(e); + } + } + public static int update(String sql,Object...keys){ + try { + Connection conn = getConn(); + PreparedStatement pst= conn.prepareStatement(sql); + for (int i = 0; i < keys.length; i++) { + pst.setObject((i+1),keys[i]); + } + int rs= pst.executeUpdate(); + return rs; + } catch (SQLException e) { + throw new RuntimeException(e); + } + } + + +} +``` + +servlet + +```java +package servlet; + +import bean.HouseInfo; +import bean.HouseType; +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 req, HttpServletResponse resp) throws ServletException, IOException { + String sql="select * from test.house_type"; + ResultSet rs = DBUtil.select(sql); + ArrayListlist=new ArrayList<>(); + try { + while (rs.next()){ + int id= rs.getInt("id"); + String type= rs.getString("type"); + HouseType a = new HouseType(id, type); + list.add(a); + } + } catch (SQLException e) { + throw new RuntimeException(e); + } + req.setAttribute("list",list); + req.getRequestDispatcher("/WEB-INF/All.jsp").forward(req,resp); + + } + + @Override + protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { + req.setCharacterEncoding("utf-8"); + //获取表单数据 + String lease_mode=req.getParameter("lease_mode"); + String rent=req.getParameter("rent"); + String contacts=req.getParameter("contacts"); + String method=req.getParameter("method"); + String typeId=req.getParameter("typeId"); + String address=req.getParameter("address"); + String sql="insert into house_info values (?,?,?,?,?,?,?)"; + int i = DBUtil.update(sql,null,lease_mode,rent,contacts,method,typeId,address); + if (i>0){ + resp.sendRedirect("/list"); + }else { + resp.getWriter().write("添加失败"); + } + } +} +package servlet; + +import bean.HouseInfo; +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("/list") + +public class ListServlet extends HttpServlet { + @Override + protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { + String sql="select * from house_info i,house_type t where i.house_type_id=t.id"; + ResultSet rs = DBUtil.select(sql); + ArrayListlist=new ArrayList<>(); + try { + while (rs.next()){ + int id= rs.getInt(1); + String mode=rs.getString(2); + double rent= rs.getDouble(3); + String contacts= rs.getString(4); + String method= rs.getString(5); + int typeId= rs.getInt(6); + String address=rs.getString(7); + int tid= rs.getInt(8); + String type1= rs.getString(9); + HouseInfo info = new HouseInfo(id, mode, rent, contacts, method, typeId, address,type1); + list.add(info); + } + } catch (SQLException e) { + throw new RuntimeException(e); + } + req.setAttribute("list",list); + req.getRequestDispatcher("/WEB-INF/list.jsp").forward(req,resp); + } + + @Override + protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { + + } +} +``` + +add + +```html +<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> +<%-- + Created by IntelliJ IDEA. + User: 17543 + Date: 2023/6/11 + Time: 22:05 + To change this template use File | Settings | File Templates. +--%> +<%@ page contentType="text/html;charset=UTF-8" language="java" %> + +'789 + Title + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
租赁方式
租金
联系人
押金方式
房屋类型 +
详细地址
+ + +``` + +All + +```html +<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> +<%-- + Created by IntelliJ IDEA. + User: 17543 + Date: 2023/6/11 + Time: 21:31 + To change this template use File | Settings | File Templates. +--%> +<%@ page contentType="text/html;charset=UTF-8" language="java" %> + + + Title + + + + + + + + + + + + + + + + + + + + + + + + +
编号租赁方式租金联系人押金方式房屋类型详细地址
${list.id}${list.lease_mode}${list.rent}${list.contacts}${list.method}${list.type1}${list.address}
+ + + +``` \ No newline at end of file -- Gitee