diff --git "a/18 \345\276\220\346\260\270\346\267\263/20230517 JSP+Servlet JDBC\344\275\234\344\270\232.md" "b/18 \345\276\220\346\260\270\346\267\263/20230517 JSP+Servlet JDBC\344\275\234\344\270\232.md"
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+### JDBC作业：
+
+1. MySQL中创建一个数据库student_db
+
+2. 库中创建student表
+
+3. 表中数据如下
+
+4. | 编号 | 姓名 | 性别 |
+   | ---- | ---- | ---- |
+   | 1    | 张三 | 男   |
+   | 2    | 李四 | 女   |
+   | 3    | 王五 | 男   |
+
+5. 编写java 4个类，分别实现以下功能
+
+   1. 查询功能，查询student中所有数据
+   2. 添加功能
+   3. 修改功能
+   4. 删除功能
+
+6. 扩展题【预习题】
+
+   1. 能否实现一个类中，用四个方法来实现上面4个类的功能
+   2. 能否实现将查询的结果，封装成java对象
+
+```mysql
+create database student_db charset utf8;
+use student_db;
+create table student(
+id int,
+name varchar(50),
+sex VARCHAR(50)
+);
+insert into student VALUES
+(1,'张三',"男"),
+(2,'李四','女'),
+(3,'王五','男');
+```
+
+
+
+```java
+select类
+    import java.sql.*;
+
+public class select {
+    public static void main(String[] args) {
+        ResultSet re=null;
+        Statement st=null;
+        Connection con=null;
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+            con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSL=false&characterEncoding=utf8", "root", "root");
+            String sql = "select * from student";
+            st = con.createStatement();
+            re = st.executeQuery(sql);
+            while (re.next()){
+                int id = re.getInt("id");
+                String name = re.getString("name");
+                String sex = re.getString("sex");
+                System.out.println(id + "\t" + name + "\t" + sex);
+
+
+            }
+        } catch (ClassNotFoundException e) {
+            System.out.println("驱动包错误");
+        } catch (SQLException e) {
+            System.out.println("运行错误");
+        } finally {
+            try {
+                if(re!=null){
+                    re.close();
+                }
+                if(st!=null){
+                    st.close();
+                }
+                if(con!=null){
+                    con.close();
+                }
+            } catch (SQLException e) {
+                e.printStackTrace();
+                System.out.println("资源释放异常");
+            }
+        }
+
+    }
+}
+```
+
+```java
+insert类
+    import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.sql.Statement;
+
+public class insert {
+    public static void main(String[] args) {
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+            Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSL=false&characterEncoding=utf8", "root", "root");
+            String sql = "insert into student values (4,'黒姫結灯','女')";
+            Statement st = con.createStatement();
+            int i = st.executeUpdate(sql);
+
+            if(i>0){
+                System.out.println("成功插入"+i+"行");
+                System.out.println("插入成功");
+            }else{
+                System.out.println("成功插入"+i+"行");
+                System.out.println("插入失败");
+            }
+        } catch (ClassNotFoundException e) {
+            System.out.println("驱动包错误");
+        } catch (SQLException e) {
+            e.printStackTrace();
+            System.out.println("运行错误");
+        }
+
+
+    }
+}
+
+```
+
+```java
+delete类
+    import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.sql.Statement;
+
+public class delete {
+    public static void main(String[] args) {
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+            Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSL=false&characterEncoding=utf8", "root", "root");
+            String sql = "delete from student where name='黒姫結灯'";
+            Statement st = con.createStatement();
+            int i = st.executeUpdate(sql);
+
+            if(i>0){
+                System.out.println("成功删除"+i+"行");
+                System.out.println("删除成功");
+            }else{
+                System.out.println("成功删除"+i+"行");
+                System.out.println("=删除失败");
+            }
+        } catch (ClassNotFoundException e) {
+            System.out.println("运行包错误");
+        } catch (SQLException e) {
+            e.printStackTrace();
+            System.out.println("运行错误");
+        }
+    }
+}
+
+```
+
+```java
+update类
+    import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.sql.Statement;
+
+public class update {
+    public static void main(String[] args) {
+        try {
+            Class.forName("com.mysql.jdbc.Driver");
+            Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student_db?useSSL=false&characterEncoding=utf8", "root", "root");
+            String sql = "update student set name='一之濑穗波',sex='女' where id=1";
+            String sqls="update student set name='砚川·e·泪香' where id=2";
+            String ssql="update student set name='冰见山玲',sex='女' where id=3";
+            Statement st = con.createStatement();
+            int i = st.executeUpdate(sqls);
+            if(i>0){
+                System.out.println("成功修改"+i+"行");
+                System.out.println("修改成功");
+            }else {
+                System.out.println("成功修改"+i+"行");
+                System.out.println("修改失败");
+            }
+        } catch (ClassNotFoundException e) {
+            System.out.println("驱动包错误");
+        } catch (SQLException e) {
+            e.printStackTrace();
+            System.out.println("运行错误");
+        }
+    }
+}
+
+```
+
diff --git "a/18 \345\276\220\346\260\270\346\267\263/20230522 jsp+servlet \344\275\234\344\270\232.md" "b/18 \345\276\220\346\260\270\346\267\263/20230522 jsp+servlet \344\275\234\344\270\232.md"
new file mode 100644
index 0000000000000000000000000000000000000000..0e81277f38ae574a156473d50b6e63686142df17
--- /dev/null
+++ "b/18 \345\276\220\346\260\270\346\267\263/20230522 jsp+servlet \344\275\234\344\270\232.md"	
@@ -0,0 +1,188 @@
+
+
+```java
+主类型
+import java.sql.*;
+
+public class DBUtil {
+    private static final String url = "jdbc:mysql:///amakano2?useSSL=false&useUnicode=true&characterEncoding=utf8";
+    private static final String user = "root";
+    private static final String password = "root";
+static {
+    try {
+        Class.forName("com.mysql.jdbc.Driver");
+    } catch (ClassNotFoundException e) {
+        e.printStackTrace();
+    }
+}
+
+public static Connection getCon() {
+    Connection con = null;
+    try {
+        con = DriverManager.getConnection(url, user, password);
+    } catch (SQLException e) {
+        e.printStackTrace();
+    }
+    return con;
+}
+
+public static ResultSet select(String sql, String... key) {
+    Connection con = getCon();
+    ResultSet re = null;
+    try {
+        PreparedStatement pr = con.prepareStatement(sql);
+
+        for (int i = 0; i < key.length; i++) {
+            pr.setString((i + 1), key[i]);
+
+        }
+        re = pr.executeQuery();
+    } catch (SQLException e) {
+        e.printStackTrace();
+    }
+    return re;
+}
+
+public static int insert(String sql, String... key) {
+    Connection con = getCon();
+    int num = 0;
+    try {
+        PreparedStatement pr = con.prepareStatement(sql);
+        for (int i = 0; i < key.length; i++) {
+            pr.setString((i + 1), key[i]);
+        }
+        num = pr.executeUpdate();
+    } catch (SQLException e) {
+        throw new RuntimeException(e);
+    }
+    return num;
+}
+public static int update(String sql,String ... key){
+    Connection con = getCon();
+    int num = 0;
+    try {
+        PreparedStatement pr = con.prepareStatement(sql);
+
+        for (int i = 0; i < key.length; i++) {
+            pr.setString((i+1),key[i]);
+        }
+        num = pr.executeUpdate();
+    } catch (SQLException e) {
+        e.printStackTrace();
+    }
+    return num;
+}
+public static int delete(String sql,String ... key){
+    Connection con = getCon();
+    int num = 0;
+    try {
+        PreparedStatement preparedStatement = con.prepareStatement(sql);
+        for (int i = 0; i < key.length; i++) {
+            preparedStatement.setString((i+1),key[i]);
+        }
+        num = preparedStatement.executeUpdate();
+    } catch (SQLException e) {
+        e.printStackTrace();
+    }
+    return num;
+}
+    }
+```
+
+
+
+
+```java
+查询测试类
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.Scanner;
+
+public class Select {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        ResultSet se = DBUtil.select("select * from amakano");
+        try {
+            while (se.next()){
+                int age=se.getInt("age");
+                String name=se.getString("name");
+                String address=se.getString("address");
+                System.out.println(name+" "+address+"|"+age);
+            }
+        } catch (SQLException e) {
+            e.printStackTrace();
+        }
+
+}
+
+}
+```
+
+
+
+
+
+```jAVA
+插入测试类
+import java.util.Scanner;
+
+public class Insert {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        System.out.println("请输入要插入的姓名,地址,年龄");
+        int i = DBUtil.insert("insert into amakano values (?,?,?)", sc.next(), sc.next(), sc.next());
+        int num=DBUtil.insert("insert into amakano values(?,?,?)", sc.next(), sc.next(), sc.next());
+        if(num>0){
+            System.out.println("插入成功");
+            System.out.println("插入"+num+"行");
+        }else{
+            System.out.println("失败");
+        }
+    }
+}
+```
+
+
+
+
+
+```java
+修改测试类
+public class Update {
+    public static void main(String[] args) {
+        int update = DBUtil.update("update amakano set address=? where name=?","白鹭市","黑姬结灯");
+        if(update>0){
+            System.out.println("成功修改"+update+"行");
+            System.out.println("成功修改");
+        }else {
+            System.out.println("修改失败");
+        }
+
+}
+
+}
+```
+
+
+
+
+
+```java
+删除测试类
+public class Delete {
+    public static void main(String[] args) {
+        int delete = DBUtil.delete("delete from amakano where name=?","一之濑穗波");
+        if(delete>0){
+            System.out.println("成功删除"+delete+"行");
+            System.out.println("成功删除");
+        }else {
+            System.out.println("删除失败");
+        }
+    }
+}
+```
+
+
+
+
+