From 92fd9ddadbeda66cf0a2acf88fb40809b968c214 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=88=98=E5=B0=91=E6=B5=B7?= <3087930763@qq.com>
Date: Fri, 26 May 2023 11:04:34 +0800
Subject: [PATCH] =?UTF-8?q?2023=200525=20=E7=BD=91=E9=A1=B5=E8=BE=93?=
 =?UTF-8?q?=E5=85=A5?=
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---
 ...21\351\241\265\350\276\223\345\205\245.md" | 132 ++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 "21 \345\210\230\345\260\221\346\265\267/2023 0525 \347\275\221\351\241\265\350\276\223\345\205\245.md"

diff --git "a/21 \345\210\230\345\260\221\346\265\267/2023 0525 \347\275\221\351\241\265\350\276\223\345\205\245.md" "b/21 \345\210\230\345\260\221\346\265\267/2023 0525 \347\275\221\351\241\265\350\276\223\345\205\245.md"
new file mode 100644
index 0000000..23c539d
--- /dev/null
+++ "b/21 \345\210\230\345\260\221\346\265\267/2023 0525 \347\275\221\351\241\265\350\276\223\345\205\245.md"	
@@ -0,0 +1,132 @@
+```Java
+package 练习.测试信息输入;
+
+import M05D24.DBUtil;
+
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+@WebServlet("/student")
+public class Student extends HttpServlet {
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        resp.getWriter().write("你好");
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        req.setCharacterEncoding("utf-8");
+        String id = req.getParameter("id");
+        String name = req.getParameter("name");
+        String sex = req.getParameter("sex");
+        if (id!=null){
+            String sql = "insert into student values(?,?,?)";
+            resp.setContentType("text/html;charset=utf-8");
+            int i = 0;
+            try {
+                i = DBUtil.update(sql,id,name,sex);
+            if (i>0){
+                resp.getWriter().write("添加成功");
+            }
+            } catch (SQLException e) {
+                throw new RuntimeException(e);
+            }
+        }
+        String id1 = req.getParameter("id1");
+        String name1 = req.getParameter("name1");
+        String sex1 = req.getParameter("sex1");
+        if (id1!=null){
+            String sql = "delete from student where id=?";
+            resp.setContentType("text/html;charset=utf-8");
+            int i=0;
+            try {
+                i = DBUtil.update(sql,id1);
+                if (i>0){
+                    resp.getWriter().write("删除成功");
+                }
+            } catch (SQLException e) {
+                throw new RuntimeException(e);
+            }
+        }
+        String id2 = req.getParameter("id2");
+        String name2 = req.getParameter("name2");
+        String sex2 = req.getParameter("sex2");
+        if (id2!=null){
+            String sql = "update student set name = ?,sex=? where id = ?";
+            resp.setContentType("text/html;charset=utf-8");
+            try {
+                int i = DBUtil.update(sql,name2,sex2,id2);
+                if (i>0){
+                    resp.getWriter().write("修改成功");
+                }
+            } catch (SQLException e) {
+                throw new RuntimeException(e);
+            }
+        }
+        String id3 = req.getParameter("id3");
+        String name3 = req.getParameter("name3");
+        String sex3 = req.getParameter("sex3");
+        req.setCharacterEncoding("utf-8");
+        try {
+            if (id3!=null){
+                String sql = "select * from student where id = ?";
+                resp.setContentType("text/html;charset=utf-8");
+                ResultSet re = DBUtil.query(sql, id3);
+                while (re.next()){
+                    String sid = re.getString("id");
+                    String sname = re.getString("name");
+                    String ssex = re.getString("sex");
+                    resp.getWriter().write(sid+"\t"+sname+"\t"+ssex);
+                }
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}
+
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>测试</title>
+</head>
+<body>
+<form action="./student"method="post">
+    <h1>添加学生</h1>
+    学号<input type="text"name="id"><br>
+    姓名<input type="text"name="name"><br>
+    性别<input type="text"name="sex"><br>
+    <input type="submit" name="添加"><br>
+</form>
+<form action="./student"method="post">
+    <h1>删除学生</h1>
+    学号<input type="text"name="id1"><br>
+    姓名<input type="text"name="name1"><br>
+    性别<input type="text"name="sex1"><br>
+    <input type="submit"name="删除"><br>
+</form>
+<form action="./student"method="post">
+    <h1>修改学生</h1>
+    学号<input type="text"name="id2"><br>
+    姓名<input type="text"name="name2"><br>
+    性别<input type="text"name="sex2"><br>
+    <input type="submit"name="修改"><br>
+</form>
+<form action="./student"method="post">
+    <h1>查询学生</h1>
+    学号<input type="text"name="id3"><br>
+    姓名<input type="text"name="name3"><br>
+    性别<input type="text"name="sex3"><br>
+    <input type="submit"name="查询"><br>
+</form>
+</body>
+</html>
+```
+
-- 
Gitee