diff --git "a/01 \350\213\217\346\270\205\345\215\216/20230527 \347\275\221\351\241\265\344\277\256\346\224\271\346\225\260\346\215\256\345\272\223\346\225\260\346\215\256.md" "b/01 \350\213\217\346\270\205\345\215\216/20230527 \347\275\221\351\241\265\344\277\256\346\224\271\346\225\260\346\215\256\345\272\223\346\225\260\346\215\256.md"
new file mode 100644
index 0000000000000000000000000000000000000000..c967bf1b7988a987b4ffe391c5721d46cb5b1544
--- /dev/null
+++ "b/01 \350\213\217\346\270\205\345\215\216/20230527 \347\275\221\351\241\265\344\277\256\346\224\271\346\225\260\346\215\256\345\272\223\346\225\260\346\215\256.md"
@@ -0,0 +1,217 @@
+```java
+package Servlet;
+
+import Util.DBUtil;
+
+import javax.servlet.*;
+import javax.servlet.http.*;
+import javax.servlet.annotation.*;
+import java.io.IOException;
+import java.sql.SQLException;
+
+@WebServlet(name = "deleteById", value = "/deleteById")
+public class deleteById extends HttpServlet {
+ @Override
+ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+ request.setCharacterEncoding("utf-8");
+ response.setContentType("text/html;charset=utf-8");
+ String id = request.getParameter("id");
+ String sql="delete from student where sid=?";
+ try {
+ int i = DBUtil.update(sql, id);
+ if(i>0){
+ response.getWriter().write("");
+ }else{
+ response.getWriter().write("删除失败");
+ }
+ } catch (SQLException e) {
+ throw new RuntimeException(e);
+ }
+ }
+
+ @Override
+ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+
+ }
+}
+
+```
+
+```java
+package Servlet;
+
+import Util.DBUtil;
+import bean.Student;
+
+import javax.servlet.*;
+import javax.servlet.http.*;
+import javax.servlet.annotation.*;
+import java.io.IOException;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+@WebServlet(name = "UpdateById", value = "/UpdateById")
+public class UpdateById extends HttpServlet {
+ @Override
+ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+ request.setCharacterEncoding("utf-8");
+ response.setContentType("text/html;charset=utf-8");
+ String id = request.getParameter("id");
+ String sql="select * from student where id=?";
+ try {
+ ResultSet res = DBUtil.query(sql, id);
+ res.next();
+ int id1 = res.getInt(1);
+ String name = res.getString(2);
+ String sex = res.getString(3);
+ Student student = new Student(id1, name, sex);
+
+ request.setAttribute("student",student);
+ request.getRequestDispatcher("/edit.jsp").forward(request,response);
+ } catch (SQLException e) {
+ e.printStackTrace();
+ }
+
+ }
+
+ @Override
+ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+
+ }
+}
+
+```
+
+```java
+package Servlet;
+
+import Util.DBUtil;
+
+import javax.servlet.*;
+import javax.servlet.http.*;
+import javax.servlet.annotation.*;
+import java.io.IOException;
+import java.sql.SQLException;
+
+@WebServlet(name = "saveUpdate", value = "/saveUpdate")
+public class saveUpdate extends HttpServlet {
+ @Override
+ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+ doPost(request,response);
+ }
+
+ @Override
+ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+ request.setCharacterEncoding("utf-8");
+ response.setContentType("text/html;charset=utf-8");
+ String id = request.getParameter("id");
+ String name = request.getParameter("name");
+ String sex = request.getParameter("sex");
+ String sql = "update student set name=?,sex=? where id=?";
+ int i = 0;
+ try {
+ i = DBUtil.update(sql, name, sex,id);
+ } catch (SQLException e) {
+ throw new RuntimeException(e);
+ }
+ if (i>0){
+ response.getWriter().write("");
+ //成功之后能不能自动调回列表
+ //请求有请求转发，响应有重定向
+// response.sendRedirect("/index.jsp");
+
+ }else{
+ response.getWriter().write("修改失败");
+ }
+ }
+}
+
+```
+
+```java
+<%@ page import="Util.DBUtil" %>
+<%@ page import="java.sql.ResultSet" %><%--
+ Created by IntelliJ IDEA.
+ User: Administrator
+ Date: 2023-05-27
+ Time: 15:31
+ To change this template use File | Settings | File Templates.
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+
+
+ 学生表
+
+
+
+
+
+ | 学号 |
+ 姓名 |
+ 性别 |
+ 操作 |
+
+ <%
+ String sql="select * from student";
+ ResultSet res = DBUtil.query(sql);
+ while(res.next()){
+ int id = res.getInt("sid");
+ String name = res.getString("sname");
+ String sex = res.getString("ssex");
+
+ %>
+
+ | <%=id%> |
+ <%=name%> |
+ <%=sex%> |
+ 修改 删除 |
+
+
+ <%
+ }
+ %>
+ |
+
+
+
+
+```
+
+```java
+<%@ page import="bean.Student" %><%--
+ Created by IntelliJ IDEA.
+ User: sqh
+ Date: 2023/5/28
+ Time: 22:39
+ To change this template use File | Settings | File Templates.
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+
+
+ 修改学生信息
+
+
+<%
+ Student student = (Student)request.getAttribute("student");
+%>
+<%=student.getId()%>
+<%=student.getName()%>
+<%=student.getSex()%>
+
+
+
+ 姓名：
+ 性别：
+
+
+
+
+
+
+```
+