diff --git "a/19 \345\224\220\345\233\275\344\272\256/20230603.md" "b/19 \345\224\220\345\233\275\344\272\256/20230603.md" new file mode 100644 index 0000000000000000000000000000000000000000..c2bf6f53f97273e1e98ff416c637b7d37f93a224 --- /dev/null +++ "b/19 \345\224\220\345\233\275\344\272\256/20230603.md" @@ -0,0 +1,257 @@ +<%@ page import="Tool.DbJbdc" %> +<%@ page import="java.sql.ResultSet" %> +<%@ page contentType="text/html;charset=UTF-8" language="java" %> + + + + 学生信息 + + + + + + <% + String sql="select * from student"; + ResultSet rs = DbJbdc.Query(sql); + while (rs.next()){ + int id = rs.getInt("id"); + String name = rs.getString("name"); + String sex = rs.getString("sex"); + + %> + + + + + + + + + <% + } + %> + + +
编号姓名性别操作
<%=id%><%=name%><%=sex%>修改 删除
+ + + +``` + +```java +package servlet; + +public class student { + private int id; + private String name; + private String sex; + + public student() { + } + + public student(int id, String name, String sex) { + this.id = id; + this.name = name; + this.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; + } +} + +``` + +```java +package servlet; + +import Tool.DbJbdc; +import jakarta.servlet.ServletException; +import jakarta.servlet.annotation.WebServlet; +import jakarta.servlet.http.HttpServlet; +import jakarta.servlet.http.HttpServletRequest; +import jakarta.servlet.http.HttpServletResponse; + +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 = DbJbdc.Query(sql, id); + rs.next(); + int id1 = rs.getInt("id"); + String name = rs.getString("name"); + String sex = rs.getString("sex"); + student stu = new student(id1, name, sex); + request.setAttribute("student",stu); + request.getRequestDispatcher("/edit.jsp").forward(request,response); + } catch (SQLException e) { + throw new RuntimeException(e); + } catch (ClassNotFoundException e) { + throw new RuntimeException(e); + } + } + + @Override + protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { + + } +} + +``` + +```java +package servlet; + +import Tool.DbJbdc; +import jakarta.servlet.ServletException; +import jakarta.servlet.annotation.WebServlet; +import jakarta.servlet.http.HttpServlet; +import jakarta.servlet.http.HttpServletRequest; +import jakarta.servlet.http.HttpServletResponse; + +import java.io.IOException; +import java.sql.SQLException; + + +@WebServlet(name = "deleteById", value = "/deleteById") +public class deleteById 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="delete from student where id=?"; + try { + int i = DbJbdc.Update(sql, id); + if (i>0){ + response.getWriter().write(""); +// response.sendRedirect("/index.jsp"); + }else { + response.getWriter().write("删除失败"); + } + } catch (SQLException | ClassNotFoundException e) { + throw new RuntimeException(e); + } + } + + @Override + protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { + + } +} + +``` + +```java +package servlet; + +import Tool.DbJbdc; +import jakarta.servlet.ServletException; +import jakarta.servlet.annotation.WebServlet; +import jakarta.servlet.http.HttpServlet; +import jakarta.servlet.http.HttpServletRequest; +import jakarta.servlet.http.HttpServletResponse; + +import java.io.IOException; +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 { + + } + + @Override + protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { + response.setContentType("text/html;charset=utf-8"); + request.setCharacterEncoding("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=?"; + try { + int i = DbJbdc.Update(sql, name, sex,id); + if (i>0){ + response.getWriter().write(""); + // response.sendRedirect("/index.jsp"); + }else { + response.getWriter().write("修改失败"); + } + } catch (SQLException e) { + throw new RuntimeException(e); + } catch (ClassNotFoundException e) { + throw new RuntimeException(e); + } + } +} + +``` + + + +```jsp +<%@ page import="servlet.student" %><%-- + Created by IntelliJ IDEA. + User: Administrator + Date: 2023-05-27 + Time: 16:55 + To change this template use File | Settings | File Templates. +--%> +<%@ page contentType="text/html;charset=UTF-8" language="java" %> + + + 修改学生 + + +<% + student stu = (student) request.getAttribute("student"); +%> +
+ 姓名
+ 性别
+ + +
+ + + +``` \ No newline at end of file diff --git "a/19 \345\224\220\345\233\275\344\272\256/20230606.md" "b/19 \345\224\220\345\233\275\344\272\256/20230606.md" new file mode 100644 index 0000000000000000000000000000000000000000..e76a9c6bda20377c81b10343b1cd810b18bedc07 --- /dev/null +++ "b/19 \345\224\220\345\233\275\344\272\256/20230606.md" @@ -0,0 +1,475 @@ +```java +package bean; + +public class attence { + private int id; + private String time; + private int type; + private int sid; + private String stuName; + private String name; + private int aid; + + @Override + public String toString() { + return "attence{" + + "id=" + id + + ", time='" + time + '\'' + + ", type=" + type + + ", sid=" + sid + + ", stuName='" + stuName + '\'' + + ", name='" + name + '\'' + + ", aid=" + aid + + '}'; + } + + public int getId() { + return id; + } + + public void setId(int id) { + this.id = id; + } + + public String getTime() { + return time; + } + + public void setTime(String time) { + this.time = time; + } + + public int getType() { + return type; + } + + public void setType(int type) { + this.type = type; + } + + public int getSid() { + return sid; + } + + public void setSid(int sid) { + this.sid = sid; + } + + public String getStuName() { + return stuName; + } + + public void setStuName(String stuName) { + this.stuName = stuName; + } + + public String getName() { + return name; + } + + public void setName(String name) { + this.name = name; + } + + public int getAid() { + return aid; + } + + public void setAid(int aid) { + this.aid = aid; + } + + public attence(int id, String time, int type, int sid, String stuName, String name, int aid) { + this.id = id; + this.time = time; + this.type = type; + this.sid = sid; + this.stuName = stuName; + this.name = name; + this.aid = aid; + } + + public attence() { + } +} + +``` + +```java +package bean; + +public class student { + private int id; + private String name; + + @Override + public String toString() { + return "student{" + + "id=" + id + + ", name='" + name + '\'' + + '}'; + } + + 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 student(int id, String name) { + this.id = id; + this.name = name; + } + + public student() { + } +} + +``` + +```java +package servlet; + +import bean.student; +import util.DBUtil; + +import javax.servlet.*; +import javax.servlet.http.*; +import javax.servlet.annotation.*; +import java.io.IOException; +import java.sql.*; +import java.util.ArrayList; + +@WebServlet("/add") +public class add extends HttpServlet { + @Override + protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { + String sql="select * from student"; + ArrayList list = new ArrayList<>(); + Connection conn = null; + PreparedStatement pst = null; + ResultSet rs = null; + try { + conn = DBUtil.getConn(); + pst = conn.prepareStatement(sql); + rs = pst.executeQuery(); + while (rs.next()){ + int id = rs.getInt(1); + String name = rs.getString(2); + student student = new student(id, name); + list.add(student); + + + } + } catch (SQLException e) { + throw new RuntimeException(e); + } finally { + DBUtil.close(conn,pst,rs); + } + + + request.setAttribute("list",list); + + + request.getRequestDispatcher("/WEB-INF/from.jsp").forward(request,response); + + } + + @Override + protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { + + } +} + +``` + +```java +package servlet; + +import bean.attence; +import util.DBUtil; + +import javax.servlet.*; +import javax.servlet.http.*; +import javax.servlet.annotation.*; +import java.io.IOException; +import java.sql.Connection; +import java.sql.PreparedStatement; +import java.sql.ResultSet; +import java.sql.SQLException; +import java.util.ArrayList; + +@WebServlet("/list") +public class list extends HttpServlet { + @Override + protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { + String sql="select * from student s,attence a where s.sid=a.sid"; + ArrayList list = new ArrayList<>(); + Connection conn = null; + PreparedStatement pst = null; + ResultSet rs = null; + try { + conn = DBUtil.getConn(); + pst = conn.prepareStatement(sql); + rs = pst.executeQuery(); + while (rs.next()){ + int id = rs.getInt(1); + String name = rs.getString(2); + int aid = rs.getInt(3); + String time = rs.getString(4); + int type = rs.getInt(5); + String sutName = rs.getString(6); + attence att = new attence(id,time,type,0,sutName,name,aid); + list.add(att); + + + } + } catch (SQLException e) { + throw new RuntimeException(e); + } finally { + DBUtil.close(conn,pst,rs); + } + + request.setAttribute("list",list); + request.getRequestDispatcher("/WEB-INF/list.jsp").forward(request,response); + + + + } + + @Override + protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { + + } +} + +``` + +```java +package servlet; + +import util.DBUtil; + +import javax.servlet.*; +import javax.servlet.http.*; +import javax.servlet.annotation.*; +import java.io.IOException; +import java.sql.Connection; +import java.sql.PreparedStatement; +import java.sql.SQLException; + +@WebServlet("/save") +public class save extends HttpServlet { + @Override + protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { + + } + + @Override + protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { + request.setCharacterEncoding("utf-8"); + int sid = Integer.parseInt(request.getParameter("sid")); + String time = request.getParameter("time"); + int type = Integer.parseInt(request.getParameter("type")); + + String sql="insert into attence values (?,?,?,?)"; + + int i = 0; + Connection conn = null; + PreparedStatement pst = null; + try { + conn = DBUtil.getConn(); + pst = conn.prepareStatement(sql); + pst.setInt(1,0); + pst.setString(2,time); + pst.setInt(3,type); + pst.setInt(4,sid); + i = pst.executeUpdate(); + } catch (SQLException e) { + throw new RuntimeException(e); + } finally { + DBUtil.close(conn,pst,null); + } + if (i>0){ + response.sendRedirect("/list"); + }else { + request.setAttribute("msg","添加失败"); + request.getRequestDispatcher("/WEB-INF/msg.jsp").forward(request,response); + } + + + } +} +``` + +```java +package util; + +import java.sql.*; + +public class DBUtil { + static String url = "jdbc:mysql:///attdb?useSSL=false&useUnicode=true&characterEncoding=utf8"; + static String user = "root"; + static String pwd = "root"; + static { + try { + Class.forName("com.mysql.jdbc.Driver"); + } catch (ClassNotFoundException e) { + throw new RuntimeException(e); + } + } + + public static Connection getConn() throws SQLException { + Connection conn = DriverManager.getConnection(url, user, pwd); + return conn; + } + + public static void close(Connection conn, PreparedStatement pst, ResultSet rs) { + try { + if (rs != null) { + rs.close(); + } + if (pst != null) { + pst.close(); + } + if (conn != null) { + conn.close(); + } + } catch (SQLException e) { + throw new RuntimeException(e); + } + + } +} +``` + +```jsp +<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> +<%-- + Created by IntelliJ IDEA. + User: Administrator + Date: 2023-06-05 + Time: 10:17 + To change this template use File | Settings | File Templates. +--%> +<%@ page contentType="text/html;charset=UTF-8" language="java" %> + + + Title + + + +
+ + + + + + + + + + + + + + + + + + + +
学生姓名
考勤时间
考勤状况 +
+ + + + + + +
+
+ +
+ + + + +``` + +```jsp +<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> +<%-- + Created by IntelliJ IDEA. + User: Administrator + Date: 2023-06-05 + Time: 09:41 + To change this template use File | Settings | File Templates. +--%> +<%@ page contentType="text/html;charset=UTF-8" language="java" %> + + + Title + + + + + + + + + + + + + + + + + + + + + + + +
考勤编号学生编号学生姓名出勤时间出勤状况
${attence.aid}${attence.id}${attence.name}${attence.time}${attence.type}
+ + + +``` + +```jsp +<%@ page contentType="text/html;charset=UTF-8" language="java" %> + + + 提醒 + + +${msg} +
+返回列表 + + +``` +