diff --git "a/39 \345\247\234\344\274\237\345\261\261/20230526 \347\275\221\351\241\265\350\276\223\345\205\245.md" "b/39 \345\247\234\344\274\237\345\261\261/20230526 \347\275\221\351\241\265\350\276\223\345\205\245.md"
new file mode 100644
index 0000000000000000000000000000000000000000..0f17c5d24a7633bcb72968d344eebb5221a768ac
--- /dev/null
+++ "b/39 \345\247\234\344\274\237\345\261\261/20230526 \347\275\221\351\241\265\350\276\223\345\205\245.md"
@@ -0,0 +1,129 @@
+```JAVA
+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);
+ }
+ }
+}
+```
+
+```HTML
+
+
+
+
+ 测试
+
+
+
+
+
+
+
+```
+