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+```java
+<%@ page import="java.sql.ResultSet" %>
+<%@ page import="Utils.JDBC" %><%--
+ //index.jsp
+ Created by IntelliJ IDEA.
+ User: Administrator
+ Date: 2023-05-27
+ Time: 15:27
+ To change this template use File | Settings | File Templates.
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+
+
+ 学生列表
+
+
+
+
+
+ | 编号 |
+ 姓名 |
+ 年龄 |
+ 操作 |
+
+ <%
+ String sql = "select *from student";
+ ResultSet select = JDBC.select(sql);
+ while (select.next()) {
+ int id = select.getInt("id");
+ String name = select.getString("name");
+ String sex = select.getString("sex");
+ %>
+
+ | <%=id%>
+ |
+ <%=name%>
+ |
+ <%=sex%>
+ |
+ 修改 删除 |
+
+
+ <%
+ }
+ %>
+
+
+
+
+<%@ page import="use.Student" %><%--
+ Created by IntelliJ IDEA.
+ //Update.jsp
+ User: 阳
+ Date: 2023/5/28
+ Time: 20:38
+ To change this template use File | Settings | File Templates.
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+
+
+ 修改学生信息
+
+
+<%
+ // 从request取出传过来的学生对象
+// 强转，因为默认是Object
+%>
+
+<%
+ Student student = (Student) request.getAttribute("student");
+%>
+
+
+
+
+
+//工具类
+package Utils;
+import java.sql.*;
+
+public class JDBC {
+ static {
+ try {
+ Class.forName("com.mysql.jdbc.Driver");
+ } catch (ClassNotFoundException e) {
+ throw new RuntimeException(e);
+ }
+ }
+ //创建连接
+ private static Connection conn() {
+ String url = "jdbc:mysql://localhost:3306/student?useUnicode=true&characterEncoding=utf8";
+ Connection conn = null;
+ try {
+ conn = DriverManager.getConnection(url, "root", "36932211");
+ } catch (SQLException e) {
+ throw new RuntimeException(e);
+ }
+ return conn;
+ }
+
+ //查询
+ public static ResultSet select(String sql, String... arr) {
+ ResultSet re = null;
+ try {
+ PreparedStatement pst = conn().prepareStatement(sql);
+ for (int i = 0; i < arr.length; i++) {
+ pst.setString((i + 1), arr[i]);
+ }
+ re = pst.executeQuery();
+ } catch (SQLException e) {
+ throw new RuntimeException(e);
+ }
+ return re;
+ }
+
+ //增删改
+ public static int update(String sql, String... arr) {
+ try {
+ PreparedStatement pst = conn().prepareStatement(sql);
+ for (int i = 0; i < arr.length; i++) {
+ pst.setString((i + 1), arr[i]);
+ }
+ int i = pst.executeUpdate();
+ return i;
+ } catch (SQLException e) {
+ throw new RuntimeException(e);
+ }
+ }
+}
+//封装的学生对象
+package use;
+
+public class Student {
+ private int id;
+ private String name;
+ private String sex;
+
+ @Override
+ public String toString() {
+ return "Student{" +
+ "id=" + id +
+ ", name='" + name + '\'' +
+ ", 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;
+ }
+
+ public Student() {
+ }
+
+ public Student(int id, String name, String sex) {
+ this.id = id;
+ this.name = name;
+ this.sex = sex;
+ }
+}
+
+package Servlet;
+//delete Servlet
+import Utils.JDBC;
+
+import javax.servlet.*;
+import javax.servlet.http.*;
+import javax.servlet.annotation.*;
+import java.io.IOException;
+
+@WebServlet(name = "deletebyid", value = "/deletebyid")
+public class deletebyid extends HttpServlet {
+ @Override
+ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+// 设置处理乱码
+ request.setCharacterEncoding("utf-8");
+ response.setContentType("text/html;character=utf-8");
+// 接受网页参数
+ String id=request.getParameter("id");
+// 设置sql语句
+ String sql="delete from student where id=?";
+ response.setCharacterEncoding("utf-8");
+// 处理结果
+ try {
+ int i = JDBC.update(sql,id);
+ if (i>0){
+ response.getWriter().write("");
+
+ }else {
+ response.getWriter().write("删除失败");
+ }
+ } catch (IOException e) {
+ throw new RuntimeException(e);
+ }
+
+ }
+
+ @Override
+ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+
+ }
+}
+
+package Servlet;
+//update Servlet
+
+import Utils.JDBC;
+import use.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 {
+ // 设置处理乱码
+ request.setCharacterEncoding("utf-8");
+ response.setContentType("text/html;character=utf-8");
+// 根据id去更改信息
+ String id=request.getParameter("id");
+
+ String sql="select *from student where id=?";
+ try {
+ ResultSet rs = JDBC.select(sql, id);
+// 因为查出来的id只有一个，所以不用while循环了
+// 这里得到学生信息，不直接响应，可以封装成一个学生对象。
+// 然后再将它转发给一个jsp页面，让他去处理显示
+ rs.next();
+ int stuid = rs.getInt("id");
+ String name = rs.getString("name");
+ String sex = rs.getString("sex");
+ Student stu = new Student(stuid,name,sex);
+
+// 将Student对象，添加到request。并转发给负责显示表单的jsp
+ request.setAttribute("student",stu);
+//
+ request.getRequestDispatcher("/update.jsp").forward(request,response);
+
+ } catch (SQLException e) {
+ throw new RuntimeException(e);
+ }
+
+ }
+
+ @Override
+ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+
+ }
+}
+
+package Servlet;
+//saveUpdate Servlet
+
+import Utils.JDBC;
+
+
+import javax.servlet.*;
+import javax.servlet.http.*;
+import javax.servlet.annotation.*;
+import java.io.IOException;
+
+
+@WebServlet(name = "saveUpdate", value = "/saveUpdate")
+public class savaUpdate extends HttpServlet {
+ @Override
+ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+// 将doGet转发给doPost，这样两个都可以用
+ doPost(request, response);
+ }
+
+ @Override
+ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+// 接受表单信息，将数据保存到数据库
+ // 设置处理乱码
+ request.setCharacterEncoding("utf-8");
+ response.setContentType("text/html;character=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=?";
+ response.setCharacterEncoding("utf-8");
+// 处理结果
+ try {
+ int i = JDBC.update(sql,name,sex,id);
+ if (i>0){
+ response.getWriter().write("");
+
+ }else {
+ response.getWriter().write("修改失败");
+ }
+ } catch (IOException e) {
+ throw new RuntimeException(e);
+ }
+
+ }
+}
+```
+