diff --git "a/08 \350\224\241\346\263\275\351\222\246/20230520 \351\233\206\345\220\210JSP.md" "b/08 \350\224\241\346\263\275\351\222\246/20230520 \351\233\206\345\220\210JSP.md"
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index 0000000000000000000000000000000000000000..c6665c202da7ed631c42a369754adb5861e6c9d9
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+++ "b/08 \350\224\241\346\263\275\351\222\246/20230520 \351\233\206\345\220\210JSP.md"	
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+## 工具类
+
+~~~java
+import java.sql.*;
+public class DBUtil {
+    private static final String url= "jdbc:mysql://localhost:3306/student_db?useSSL=false&useUnicode=true&characterEncoding=utf8";
+    private static final String username="root";
+    private static final String password="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,username,password);
+        return conn;
+    }
+    //查询
+    public static ResultSet query(String sql) throws SQLException {
+        Connection conn = getConn();
+        PreparedStatement pst = conn.prepareStatement(sql);
+        ResultSet rs = pst.executeQuery();
+        return rs;
+    }
+    //释放资源
+    public static void close(Connection conn,PreparedStatement pst,ResultSet rs) throws SQLException {
+        if (rs!=null){
+            rs.close();
+        }
+        if (pst!=null){
+            pst.close();
+        }
+        if (conn!=null){
+            conn.close();
+        }
+~~~
+
+## 测试类
+
+~~~java
+import java.sql.*;
+import java.util.ArrayList;
+
+public  class Test02 {
+    public static void main(String[] args) throws SQLException {
+        ArrayList<student> stu = new ArrayList<>();
+        String sql = "select * from student";
+        ResultSet rs = DBUtil.query(sql);
+        while (rs.next()){
+            int id = rs.getInt("id");
+            String name = rs.getString("name");
+            String sex = rs.getString("sex");
+            student st1 = new student(id, name, sex);
+            stu.add(st1);
+        }
+        for (int i = 0; i <stu.size() ; i++) {
+            student s = stu.get(i);
+            System.out.println(s.getId()+"\t\t"+s.getName()+"\t\t"+s.getSex());
+        }
+        DBUtil.close(null,null,rs);
+    }
+    static 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 int getId() {
+            return id;
+        }
+
+        public void setId(int id) {
+            this.id = id;
+        }
+
+        public String getName() {
+            return name;
+        }
+
+        public void setName(String name) {
+            this.name = name;
+        }
+
+        public String getSex() {
+            return sex;
+        }
+
+        public void setSex(String sex) {
+            this.sex = sex;
+        }
+
+    }
+}
+
+~~~
+