From 2c6a089b7cf5240ef79a258132021323e13129c8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=86=AF=E9=94=90?= <2570878950@qq.com>
Date: Fri, 26 May 2023 23:39:00 +0800
Subject: [PATCH] =?UTF-8?q?=E2=80=9C=E6=88=91=E7=9A=84=E7=AC=AC=E5=9B=9B?=
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+```html
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>学生管理系统</title>
+</head>
+<body>
+<form action="Servlet" method="post">
+    <h1>查询学生</h1>
+    输入你要查询的学生编号:<input type="text" name="id"><br>
+    输入你要查询的学生姓名:<input type="text" name="name"><br>
+    输入你要查询的学生性别:<input type="text" name="sex"><br>
+    <input type="submit" name="submit" value="查询">
+</form>
+<form action="Servlet" method="post">
+    <h1>添加学生</h1>
+    输入你要添加的学生编号:<input type="text" name="id"><br>
+    输入你要添加的学生姓名:<input type="text" name="name"><br>
+    输入你要添加的学生性别:<input type="text" name="sex"><br>
+    <input type="submit" name="submit" value="添加">
+</form>
+<form action="Servlet" method="post">
+    <h1>删除学生</h1>
+    输入你要删除的学生编号:<input type="text" name="id"><br>
+    <input type="submit" name="submit" value="删除">
+</form>
+<form action="Servlet" method="post">
+    <h1>修改学生</h1>
+    输入你要修改的学生编号:<input type="text" name="id"><br>
+    输入你要修改的学生姓名:<input type="text" name="name"><br>
+    <input type="submit" name="submit" value="修改">
+</form>
+</body>
+</html>
+```
+
+```java
+package com.dao;
+
+import java.sql.*;
+
+public class Dao {
+ private Connection conn;
+ private String driver = "com.mysql.jdbc.Driver";
+ private String url ="jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&charsetEnding=utf8";
+ private String user="root";
+ private String password="root";
+
+    public Dao() {
+        try {
+            Class.forName(driver);
+            System.out.println("驱动加载成功");
+        } catch (ClassNotFoundException e) {
+            System.out.println("驱动加载失败!");
+            throw new RuntimeException(e);
+        }
+    }
+
+    public Connection getConn() {
+        try {
+            conn = DriverManager.getConnection(url,user,password);
+            System.out.println("数据库连接成功");
+        } catch (SQLException e) {
+            System.out.println("数据库连接失败！");
+            throw new RuntimeException(e);
+        }
+        return conn;
+    }
+
+    public void setConn(Connection conn) {
+        this.conn = conn;
+    }
+}
+```
+
+```java
+package com.student;
+
+public class Student {
+    private int id;
+    private String name;
+    private String sex;
+
+    public Student() {
+    }
+
+    public Student(int id, String name, String sex) {
+        this.id = id;
+        this.name = name;
+        this.sex = sex;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public void setSex(String sex) {
+        this.sex = sex;
+    }
+
+    @Override
+    public String toString() {
+        return "id= "+ id +" name= "+name+" sex= "+sex;
+    }
+}
+```
+
+```java
-- 
Gitee

