From 002bbd0b8f51f0e6a2604a88feb973cb3a53f13a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=92=9F=E6=A2=93=E9=91=AB?= <1813169067@qq.com>
Date: Sun, 28 May 2023 23:04:53 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BD=9C=E4=B8=9A?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 ...71\346\225\260\346\215\256\345\272\223.md" | 170 ++++++++++++++++++
 1 file changed, 170 insertions(+)
 create mode 100644 "27\351\222\237\346\242\223\351\221\253/20230527 \350\241\250\345\215\225\344\277\256\346\224\271\346\225\260\346\215\256\345\272\223.md"

diff --git "a/27\351\222\237\346\242\223\351\221\253/20230527 \350\241\250\345\215\225\344\277\256\346\224\271\346\225\260\346\215\256\345\272\223.md" "b/27\351\222\237\346\242\223\351\221\253/20230527 \350\241\250\345\215\225\344\277\256\346\224\271\346\225\260\346\215\256\345\272\223.md"
new file mode 100644
index 0000000..09380b9
--- /dev/null
+++ "b/27\351\222\237\346\242\223\351\221\253/20230527 \350\241\250\345\215\225\344\277\256\346\224\271\346\225\260\346\215\256\345\272\223.md"	
@@ -0,0 +1,170 @@
+UPdateByld
+
+~~~java
+package com.sonyang.servlet;
+
+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 {
+        response.setContentType("text/html;charset=utf-8");
+        request.setCharacterEncoding("utf-8");
+
+
+        String id = request.getParameter("id");
+        String sql = "select * from student where id=?";
+        try {
+            ResultSet rs = DBUtil.query(sql,id);
+            rs.next();
+            int id2 = rs.getInt("id");
+            String name = rs.getString("name");
+            String sex = rs.getString("sex");
+            Student stu = new Student(id2, name, sex);
+            request.setAttribute("student",stu);
+            request.getRequestDispatcher("/edit.jsp").forward(request,response);
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+
+    }
+}
+
+~~~
+
+saveUpdate
+
+~~~java
+package com.sonyang.servlet;
+
+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 = "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 sql = "update student set name=?,sex=? where id=?";
+        String id = request.getParameter("id");
+        String name = request.getParameter("name");
+        String sex = request.getParameter("sex");
+        int i = 0;
+        try {
+            i = DBUtil.update(sql,name,sex,id);
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+        if (i>0){
+            response.getWriter().write("修改成功");
+        }else{
+            response.getWriter().write("修改失败");
+        }
+    }
+}
+
+~~~
+
+index
+
+~~~jsp
+<%@ page import="com.sonyang.servlet.DBUtil" %>
+<%@ page import="java.sql.ResultSet" %><%--
+  Created by IntelliJ IDEA.
+  User: Administrator
+  Date: 2023-05-27
+  Time: 14:07
+  To change this template use File | Settings | File Templates.
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+  <head>
+    <title>学生表单</title>
+  </head>
+  <style>
+    table{
+      border-collapse: collapse;
+      text-align: center;
+    }
+  </style>
+  <body>
+ <table border="1" width="300">
+   <tr><th>编号</th><th>姓名</th><th>性别</th><th>操作</th></tr>
+   <%
+     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");
+   %>
+   <tr>
+     <td><%=id%></td>
+     <td><%=name%></td>
+     <td><%=sex%></td>
+     <td><a href="/UpdateById?id=<%=id%>">修改</a> </td>
+   </tr>
+   <%
+     }
+   %>
+
+ </table>
+  </body>
+</html>
+
+~~~
+
+edit
+
+~~~jsp
+<%@ page import="com.sonyang.servlet.Student" %><%--
+  Created by IntelliJ IDEA.
+  User: Administrator
+  Date: 2023-05-27
+  Time: 16:22
+  To change this template use File | Settings | File Templates.
+--%>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+<head>
+    <title>修改学生信息</title>
+</head>
+<body>
+<%
+    Student student = (Student) request.getAttribute("student");
+%>
+
+
+<form action="/saveUpdate" method="post">
+    姓名：<input type="text" name="name" value="<%=student.getName()%>"> <br>
+    性别：<input type="text" name="sex" value="<%=student.getSex()%>"> <br>
+    <input type="text" name="id" value="<%=student.getId()%>"hidden="hidden"> <br>
+    <input type="submit" value="提交修改">
+</form>
+</body>
+</html>
+
+~~~
+
-- 
Gitee