From 35d2fc4dd43625743e5bc8648c08c23d7e59cfba Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E6=9D=A8=E6=B4=8B?= Date: Sun, 28 May 2023 23:19:05 +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 --- ...44\346\225\260\346\215\256\345\272\223.md" | 261 ++++++++++++++++++ 1 file changed, 261 insertions(+) create mode 100644 "48 \346\235\250\346\264\213/20230528\347\275\221\351\241\265\347\233\264\346\216\245\345\210\240\351\231\244\346\225\260\346\215\256\345\272\223.md" diff --git "a/48 \346\235\250\346\264\213/20230528\347\275\221\351\241\265\347\233\264\346\216\245\345\210\240\351\231\244\346\225\260\346\215\256\345\272\223.md" "b/48 \346\235\250\346\264\213/20230528\347\275\221\351\241\265\347\233\264\346\216\245\345\210\240\351\231\244\346\225\260\346\215\256\345\272\223.md" new file mode 100644 index 0000000..e88fbe4 --- /dev/null +++ "b/48 \346\235\250\346\264\213/20230528\347\275\221\351\241\265\347\233\264\346\216\245\345\210\240\351\231\244\346\225\260\346\215\256\345\272\223.md" @@ -0,0 +1,261 @@ +```java +package bean; +//学生类 +public class Student { + private int id; + private String name; + private String sex; + + public Student(int id, String name, String sex) { + this.id = id; + this.name = name; + this.sex = sex; + } + + public Student() { + } + + 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; + } +} + +``` + +```java +package servlet; +//删除信息 +import utils.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.SQLException; + +@WebServlet("/deleteByID") +public class deleteByID extends HttpServlet { + @Override + protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { + req.setCharacterEncoding("utf-8"); + resp.setContentType("text/html;charset=utf-8"); + String id = req.getParameter("id"); + String sql="delete from student where id=?"; + int i = 0; + try { + i = DBUtil.update(sql); + } catch (SQLException e) { + throw new RuntimeException(e); + } + if(i>0){ + resp.getWriter().write(""); + }else resp.getWriter().write("删除失败"); + } + + @Override + protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { + + } +} + +``` + +```java +package servlet; +import utils.DBUtil; + +import javax.servlet.RequestDispatcher; +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.SQLException; + +@WebServlet("/saveUpdate") +public class saveUpdate extends HttpServlet { + @Override + protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { + + doPost(req, resp); + } + + @Override + protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { + + req.setCharacterEncoding("utf-8"); + resp.setContentType("text/html;charset=utf-8"); + String id = req.getParameter("id"); + String name = req.getParameter("name"); + String sex = req.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){ + resp.getWriter().write(""); + }else resp.getWriter().write("修改失败"); + + } +} + +``` + +```java +package servlet; + +import bean.Student; +import utils.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("/deleteByID") +public class updateByID extends HttpServlet { + @Override + protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { + + req.setCharacterEncoding("utf-8"); + resp.setContentType("text/html;charset=utf-8"); + String id = req.getParameter("id"); + String sql="select * from student where id=?"; + try { + ResultSet query = DBUtil.query(sql); + query.next(); + int i = query.getInt("id"); + String name = query.getString("name"); + String sex = query.getString("sex"); + Student student = new Student(i,name,sex); + + req.setAttribute("student",student); + req.getRequestDispatcher("/edit.jsp").forward(req,resp); + + } catch (SQLException e) { + throw new RuntimeException(e); + } + + + } + + @Override + protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { + + } +} + +``` + +```jsp +<%@ page import="java.sql.ResultSet" %> +<%@ page import="utils.DBUtil" %><%-- + Created by IntelliJ IDEA. + User: asus + Date: 2023/5/23 + Time: 21:13 + To change this template use File | Settings | File Templates. +--%> +<%@ page contentType="text/html;charset=UTF-8" language="java" %> + + + 学生列表 + <%----%> + + + + + + + + + + <% + String sql="select * from student"; + ResultSet query = DBUtil.query(sql); + while (query.next()){ + int id = query.getInt("id"); + String name = query.getString("name"); + String sex = query.getString("sex"); + response.getWriter().write(id+name+sex+"
"); + %> + + + + + + + + + <% } %> + +
编号姓名性别操作
<%=id%><%=name%><%=sex%>修改 + 删除
+ + + +``` + +```jsp +<%@ page import="bean.Student" %><%-- + Created by IntelliJ IDEA. + User: asus + Date: 2023/5/28 + Time: 21:39 + 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"); +%> + + + + + +``` + -- Gitee