石家莊去鐵道大學課程資訊管理系統
阿新 • • 發佈：2018-12-09
1、專案需求：
課程管理是各大院校的管理工作中尤為重視的一項工作，它一直以來是學校管 理的一項重要的衡量指標。石家莊鐵道大學為了提高工作效率，實現資訊化管理， 要求開發課程管理系統。
2.系統要求與功能設計
2.1 頁面功能要求
（1）能夠在 Tomcat 伺服器中正確部署，並通過瀏覽器檢視；（1 分）
（2）網站頁面整體風格統一；
（3）主頁面：要求顯示新增新課程、修改課程資訊、刪除課程資訊、查詢課程 資訊四個子選單。（1 分）
（4）新增新課程頁：（3 分）
②新課程資訊必須唯一，如有重複，提示使用者“課程名稱重複，重新錄入”；（0.5 分）
③要求判斷任課教師為王建民、劉立嘉、劉丹、王輝、楊子光五位教師的其中 一位。（0.5 分）
④要求上課地點開頭為“一教、二教、三教、基教”中的一種。（0.5 分）
⑤將新課程資訊新增入庫。（1 分）
評分標準： ①完成新增新課程頁面（未完成 0 分，完成 0.5 分）
②儲存新課程資訊入庫（未完成 0 分，完成 1 分）
③判斷課程名稱是否唯一（未完成 0 分，完成 0.5 分）
④ 判斷任課教師為王建民、劉立嘉、劉丹、王輝、楊子光五位教師的其中一位 （未完成 0 分，完成 0.5 分）
⑤判斷上課地點開頭為“一教、二教、三教、基教”中的一種
（4）修改課程資訊頁：
可對課程名稱、任課教師、上課地點進行修改。（任課 教師和上課地點必須符合錄入要求）。（2 分）
評分標準：
①完成修改課程資訊頁面（未完成 0 分，完成 0.5 分）
② 完成資料庫中資訊更新（未完成 0 分，完成 1 分）
③修改資訊判斷是否符合要求。（未完成 0 分，完成 0.5 分）
（5）刪除課程資訊頁：錄入課程名稱，顯示詳細資訊後，點選“刪除”按鈕， 刪除該資訊。
評分標準：
①完成刪除課程資訊頁面（未完成 0 分，完成 0.5 分）
②輸入課程名稱後可顯示其餘資訊。（未完成 0 分，完成 0.5 分）
③對應刪除資料庫中資訊（未完成 0 分，完成 1 分）
（6）查詢課程資訊頁面：
輸入課程名稱、任課教師、上課地點等資訊可以實現模糊查詢。
評分標準：
①完成查詢課程資訊頁面（未完成 0 分，完成 0.5 分）
②實現按照任意條件進行模糊查詢。（未完成 0 分，完成 1 分）
③結果資訊顯示包括全部資訊。（未完成 0 分，完成 0.5 分，缺少一項扣除 0.5 分）
2.2 功能要求
（1）設計出合理的資料庫和資料表，要求使用 mysql、sqlserver、oracle 三 種資料庫中一種（1 分）
（2）資料庫連線正常（1 分）。
（3）使用 Serverlet 實現頁面互動（1 分）。
（4）使用 Java Bean 封裝資料庫連線操作（1 分。）
1、首先連線資料庫，具體資料庫的使用及如何連線eclipse
import java.sql.*; public class onnection { public static void main(String args[]) { try { Class.forName("com.mysql.jdbc.Driver"); //載入MYSQL JDBC驅動類，引號中是驅動類的路徑 System.out.println("Success loading Mysql Driver!"); } catch (Exception e) { System.out.print("Error loading Mysql Driver!"); e.printStackTrace(); } try { Connection connect = DriverManager.getConnection( "jdbc:mysql://localhost:3306/Local instance MySQL8.0","root","chen1025"); //連線URL為 jdbc:mysql//伺服器地址/埠號/資料庫名 ，後面的2個引數分別是登陸使用者名稱和密碼 //獲取資料庫連線getConnection，System.out.println("Success connect Mysql server!"); Statement stmt = connect.createStatement(); ResultSet rs = stmt.executeQuery("select * from testtable"); //testtable 為你表的名稱 while (rs.next()) { System.out.println(rs.getString("name")); } } catch (Exception e) { System.out.print("get data error!"); e.printStackTrace(); } } }
2.建立一個Course類
package com.hjf.entity; public class Course { private int id; private String name; private String teacher; private String classroom; 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 getTeacher() { return teacher; } public void setTeacher(String teacher) { this.teacher = teacher; } public String getClassroom() { return classroom; } public void setClassroom(String classroom) { this.classroom = classroom; } public Course() {} public Course(int id, String name, String teacher, String classroom) { this.id = id; this.name = name; this.teacher = teacher; this.classroom = classroom; } public Course(String name, String teacher, String classroom) { this.name = name; this.teacher = teacher; this.classroom = classroom; } }
3、建立CourseDao類 來實現課程資訊管理的增刪該查操作
package com.hjf.dao; import java.sql.Connection; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.util.ArrayList; import java.util.List; import com.hjf.entity.Course; import com.hjf.util.DBUtil; /** * 課程Dao * Dao層操作資料 * @author Hu * */ public class CourseDao { /** * 新增 * @param course * @return */ public boolean add(Course course) { String sql = "insert into course(name, teacher, classroom) values('" + course.getName() + "','" + course.getTeacher() + "','" + course.getClassroom() + "')"; Connection conn = DBUtil.getConn(); Statement state = null; boolean f = false; int a = 0; try { state = conn.createStatement(); state.executeUpdate(sql); } catch (Exception e) { e.printStackTrace(); } finally { DBUtil.close(state, conn); } if (a > 0) { f = true; } return f; } /** * 刪除 * * @param id * @return */ public boolean delete (int id) { boolean f = false; String sql = "delete from course where id='" + id + "'"; Connection conn = DBUtil.getConn(); Statement state = null; int a = 0; try { state = conn.createStatement(); a = state.executeUpdate(sql); } catch (SQLException e) { e.printStackTrace(); } finally { DBUtil.close(state, conn); } if (a > 0) { f = true; } return f; } /** * 修改 * @param name * @param pass */ public boolean update(Course course) { String sql = "update course set name='" + course.getName() + "', teacher='" + course.getTeacher() + "', classroom='" + course.getClassroom() + "' where id='" + course.getId() + "'"; Connection conn = DBUtil.getConn(); Statement state = null; boolean f = false; int a = 0; try { state = conn.createStatement(); a = state.executeUpdate(sql); } catch (SQLException e) { e.printStackTrace(); } finally { DBUtil.close(state, conn); } if (a > 0) { f = true; } return f; } /** * 驗證課程名稱是否唯一 * true --- 不唯一 * @param name * @return */ public boolean name(String name) { boolean flag = false; String sql = "select name from course where name = '" + name + "'"; Connection conn = DBUtil.getConn(); Statement state = null; ResultSet rs = null; try { state = conn.createStatement(); rs = state.executeQuery(sql); while (rs.next()) { flag = true; } } catch (SQLException e) { e.printStackTrace(); } finally { DBUtil.close(rs, state, conn); } return flag; } /** * 通過ID得到類 * @param id * @return */ public Course getCourseById(int id) { String sql = "select * from course where id ='" + id + "'"; Connection conn = DBUtil.getConn(); Statement state = null; ResultSet rs = null; Course course = null; try { state = conn.createStatement(); rs = state.executeQuery(sql); while (rs.next()) { String name = rs.getString("name"); String teacher = rs.getString("teacher"); String classroom = rs.getString("classroom"); course = new Course(id, name, teacher, classroom); } } catch (Exception e) { e.printStackTrace(); } finally { DBUtil.close(rs, state, conn); } return course; } /** * 通過name得到Course * @param name * @return */ public Course getCourseByName(String name) { String sql = "select * from course where name ='" + name + "'"; Connection conn = DBUtil.getConn(); Statement state = null; ResultSet rs = null; Course course = null; try { state = conn.createStatement(); rs = state.executeQuery(sql); while (rs.next()) { int id = rs.getInt("id"); String teacher = rs.getString("teacher"); String classroom = rs.getString("classroom"); course = new Course(id, name, teacher, classroom); } } catch (Exception e) { e.printStackTrace(); } finally { DBUtil.close(rs, state, conn); } return course; } /** * 查詢 * @param name * @param teacher * @param classroom * @return */ public List<Course> search(String name, String teacher, String classroom) { String sql = "select * from course where "; if (name != "") { sql += "name like '%" + name + "%'"; } if (teacher != "") { sql += "teacher like '%" + teacher + "%'"; } if (classroom != "") { sql += "classroom like '%" + classroom + "%'"; } List<Course> list = new ArrayList<>(); Connection conn = DBUtil.getConn(); Statement state = null; ResultSet rs = null; try { state = conn.createStatement(); rs = state.executeQuery(sql); Course bean = null; while (rs.next()) { int id = rs.getInt("id"); String name2 = rs.getString("name"); String teacher2 = rs.getString("teacher"); String classroom2 = rs.getString("classroom"); bean = new Course(id, name2, teacher2, classroom2); list.add(bean); } } catch (SQLException e) { e.printStackTrace(); } finally { DBUtil.close(rs, state, conn); } return list; } /** * 全部資料 * @param name * @param teacher * @param classroom * @return */ public List<Course> list() { String sql = "select * from course"; List<Course> list = new ArrayList<>(); Connection conn = DBUtil.getConn(); Statement state = null; ResultSet rs = null; try { state = conn.createStatement(); rs = state.executeQuery(sql); Course bean = null; while (rs.next()) { int id = rs.getInt("id"); String name2 = rs.getString("name"); String teacher2 = rs.getString("teacher"); String classroom2 = rs.getString("classroom"); bean = new Course(id, name2, teacher2, classroom2); list.add(bean); } } catch (SQLException e) { e.printStackTrace(); } finally { DBUtil.close(rs, state, conn); } return list; } }
4、呼叫上述增刪改查的函式
package com.hjf.service; import java.util.List; import com.hjf.dao.CourseDao; import com.hjf.entity.Course; /** * CourseService * 服務層 * @author Hu * */ public class CourseService { CourseDao cDao = new CourseDao(); /** * 新增 * @param course * @return */ public boolean add(Course course) { boolean f = false; if(!cDao.name(course.getName())) { cDao.add(course); f = true; } return f; } /** * 刪除 */ public void del(int id) { cDao.delete(id); } /** * 修改 * @return */ public void update(Course course) { cDao.update(course); } /** * 通過ID得到一個Course * @return */ public Course getCourseById(int id) { return cDao.getCourseById(id); } /** * 通過Name得到一個Course * @return */ public Course getCourseByName(String name) { return cDao.getCourseByName(name); } /** * 查詢 * @return */ public List<Course> search(String name, String teacher, String classroom) { return cDao.search(name, teacher, classroom); } /** * 全部資料 * @return */ public List<Course> list() { return cDao.list();
5、建立CourseServlet類，其作用是根據輸入的資料，通過Servlet進行處理，對輸入結果做出正確與否的提示。
package com.hjf.servlet; import java.io.IOException; import java.util.List; 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 com.hjf.entity.Course; import com.hjf.service.CourseService; @WebServlet("/CourseServlet") public class CourseServlet extends HttpServlet { private static final long serialVersionUID = 1L; CourseService service = new CourseService(); /** * 方法選擇 */ protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { req.setCharacterEncoding("utf-8"); String method = req.getParameter("method"); if ("add".equals(method)) { add(req, resp); } else if ("del".equals(method)) { del(req, resp); } else if ("update".equals(method)) { update(req, resp); } else if ("search".equals(method)) { search(req, resp); } else if ("getcoursebyid".equals(method)) { getCourseById(req, resp); } else if ("getcoursebyname".equals(method)) { getCourseByName(req, resp); } else if ("list".equals(method)) { list(req, resp); } } /** * 新增 * @param req * @param resp * @throws IOException * @throws ServletException */ private void add(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException { req.setCharacterEncoding("utf-8"); String name = req.getParameter("name"); String teacher = req.getParameter("teacher"); String classroom = req.getParameter("classroom"); Course course = new Course(name, teacher, classroom); //新增後訊息顯示 if(service.add(course)) { req.setAttribute("message", "新增成功"); req.getRequestDispatcher("add.jsp").forward(req,resp); } else { req.setAttribute("message", "課程名稱重複，請重新錄入"); req.getRequestDispatcher("add.jsp").forward(req,resp); } } /** * 全部 * @param req * @param resp * @throws ServletException */ private void list(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{ req.setCharacterEncoding("utf-8"); List<Course> courses = service.list(); req.setAttribute("courses", courses); req.getRequestDispatcher("list.jsp").forward(req,resp); } /** * 通過ID得到Course * @param req * @param resp * @throws ServletException */ private void getCourseById(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{ req.setCharacterEncoding("utf-8"); int id = Integer.parseInt(req.getParameter("id")); Course course = service.getCourseById(id); req.setAttribute("course", course); req.getRequestDispatcher("detail2.jsp").forward(req,resp); } /** * 通過名字查詢 * 跳轉至刪除 * @param req * @param resp * @throws IOException * @throws ServletException */ private void getCourseByName(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{ req.setCharacterEncoding("utf-8"); String name = req.getParameter("name"); Course course = service.getCourseByName(name); if(course == null) { req.setAttribute("message", "查無此課程！"); req.getRequestDispatcher("del.jsp").forward(req,resp); } else { req.setAttribute("course", course); req.getRequestDispatcher("detail.jsp").forward(req,resp); } } /** * 刪除 * @param req * @param resp * @throws IOException * @throws ServletException */ private void del(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{ req.setCharacterEncoding("utf-8"); int id = Integer.parseInt(req.getParameter("id")); service.del(id); req.setAttribute("message", "刪除成功！"); req.getRequestDispatcher("del.jsp").forward(req,resp); } /** * 修改 * @param req * @param resp * @throws IOException * @throws ServletException */ private void update(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{ req.setCharacterEncoding("utf-8"); int id = Integer.parseInt(req.getParameter("id")); String name = req.getParameter("name"); String teacher = req.getParameter("teacher"); String classroom = req.getParameter("classroom"); Course course = new Course(id, name, teacher, classroom); service.update(course); req.setAttribute("message", "修改成功"); req.getRequestDispatcher("CourseServlet?method=list").forward(req,resp); } /** * 查詢 * @param req * @param resp * @throws ServletException */ private void search(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{ req.setCharacterEncoding("utf-8"); String name = req.getParameter("name"); String teacher = req.getParameter("teacher"); String classroom = req.getParameter("classroom"); List<Course> courses = service.search(name, teacher, classroom); req.setAttribute("courses", courses); req.getRequestDispatcher("searchlist.jsp").forward(req,resp); } }
6、搭建主介面，在其中加入一些連線實現頁面的跳轉。
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>首頁</title> <style> .a{ font-size: 26px; margin-top: 20px; } </style> </head> <body> <div align="center"> <h1 style="color: red;">課程基本 資訊管理系統</h1> <div class="a"> <a href="add.jsp">課程資訊錄入</a> </div> <div class="a"> <a href="CourseServlet?method=list">課程資訊修改</a> </div> <div class="a"> <a href="del.jsp">課程資訊刪除</a> </div> <div class="a"> <a href="search.jsp">課程資訊查詢</a> </div> </div> </body> </html>
7、新增介面根據要求，增加判斷課程名稱不許重複，任課教師必須為五位的其中一個，上課地點開頭為四個教室的一種
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> <style> .a{ margin-top: 20px; } .b{ font-size: 20px; width: 160px; color: white; background-color: greenyellow; } </style> </head> <body> <% Object message = request.getAttribute("message"); if(message!=null && !"".equals(message)){ %> <script type="text/javascript"> alert("<%=request.getAttribute("message")%>"); </script> <%} %> <div align="center"> <h1 style="color: red;">課程資訊錄入</h1> <a href="index.jsp">返回主頁</a> <form action="CourseServlet?method=add" method="post" onsubmit="return check()"> <div class="a"> 課程名稱<input type="text" id="name" name="name"/> </div> <div class="a"> 任課教師<input type="text" id="teacher" name="teacher" /> </div> <div class="a"> 上課地點<input type="text" id="classroom" name="classroom" /> </div> <div class="a"> <button type="submit" class="b">保 存</button> </div> </form> </div> <script type="text/javascript"> function check() { var name = document.getElementById("name");; var teacher = document.getElementById("teacher"); var classroom = document.getElementById("classroom"); //非空 if(name.value == '') { alert('課程名稱為空'); name.focus(); return false; } if(teacher.value == '') { alert('教師為空'); teacher.focus(); return false; } if(classroom.value == '') { alert('上課地點為空'); classroom.focus(); return false; } //教師 if(teacher.value != '王建民' && teacher.value != '王輝' && teacher.value != '劉丹' && teacher.value != '劉立嘉' && teacher.value != '楊子光'){ alert('教師名稱錯誤'); return false; } //教室 if(!/^基教/.test(classroom.value) && !/^一教/.test(classroom.value) && !/^二教/.test(classroom.value) && !/^三教/.test(classroom.value)) { alert('上課地點錯誤'); return false; } } </script> </body> </html>
8、刪除介面
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> <style> .a{ margin-top: 20px; } .b{ font-size: 20px; width: 160px; color: white; background-color: greenyellow; } </style> </head> <body> <% Object message = request.getAttribute("message"); if(message!=null && !"".equals(message)){ %> <script type="text/javascript"> alert("<%=request.getAttribute("message")%>"); </script> <%} %> <div align="center"> <h1 style="color: red;">課程資訊刪除</h1> <a href="index.jsp">返回主頁</a> <form action="CourseServlet?method=getcoursebyname" method="post" onsubmit="return check()"> <div class="a"> 課程名稱<input type="text" id="name" name="name"/> </div> <div class="a"> <button type="submit" class="b">查 找</button> </div> </form> </div> <script type="text/javascript"> function check() { var name = document.getElementById("name");; //非空 if(name.value == '') { alert('課程名稱為空'); name.focus(); return false; } } </script> </body> </html> <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> <style> .a{ margin-top: 20px; } .b{ font-size: 20px; width: 160px; color: white; background-color: greenyellow; } .tb, td { border: 1px solid black; font-size: 22px; } </style> </head> <body> <div align="center"> <h1 style="color: red;">課程資訊刪除</h1> <a href="index.jsp">返回主頁</a> <table class="tb"> <tr> <td>課程名稱</td> <td>${course.name}</td> </tr> <tr> <td>任課教師</td> <td>${course.teacher}</td> </tr> <tr> <td>上課地點</td> <td>${course.classroom}</td> </tr> </table> <div class="a"> <a onclick="return check()" href="CourseServlet?method=del&id=${course.id}">刪 除</a> </div> </div> <script type="text/javascript"> function check() { if (confirm("真的要刪除嗎？")){ return true; }else{ return false; } } </script> </body> </html>
9、修改介面
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> <style> .a{ margin-top: 20px; } .b{ font-size: 20px; width: 160px; color: white; background-color: greenyellow; } </style> </head> <body> <% Object message = request.getAttribute("message"); if(message!=null && !"".equals(message)){ %> <script type="text/javascript"> alert("<%=request.getAttribute("message")%>"); </script> <%} %> <div align="center"> <h1 style="color: red;">課程資訊修改</h1> <a href="index.jsp">返回主頁</a> <form action="CourseServlet?method=update" method="post" onsubmit="return check()"> <div class="a"> 課程名稱<input type="text" id="name" name="name" value="${course.name}"/> </div> <div class="a"> 任課教師<input type="text" id="teacher" name="teacher" value="${course.teacher}"/> </div> <div class="a"> 上課地點<input type="text" id="classroom" name="classroom" value="${course.classroom}"/> </div> <input type="hidden" id="id" name="id" value="${course.id}"/> <div class="a"> <button type="submit" class="b">修 改</button> </div> </form> </div> <script type="text/javascript"> function check() { var name = document.getElementById("name");; var teacher = document.getElementById("teacher"); var classroom = document.getElementById("classroom"); //非空 if(name.value == '') { alert('課程名稱為空'); name.focus(); return false; } if(teacher.value == '') { alert('教師為空'); teacher.focus(); return false; } if(classroom.value == '') { alert('上課地點為空'); classroom.focus(); return false; } //教師 if(teacher.value != '王建民' && teacher.value != '王輝' && teacher.value != '劉丹' && teacher.value != '劉立嘉' && teacher.value != '楊子光'){ alert('教師名稱錯誤'); return false; } //教室 if(!/^基教/.test(classroom.value) && !/^一教/.test(classroom.value) && !/^二教/.test(classroom.value) && !/^三教/.test(classroom.value)) { alert('上課地點錯誤'); return false; } } </script> </body> </html>
10、查詢介面
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> <style> .a{ margin-top: 20px; } .b{ font-size: 20px; width: 160px; color: white; background-color: greenyellow; } </style> </head> <body> <div align="center"> <h1 style="color: red;">課程資訊查詢</h1> <a href="index.jsp">返回主頁</a> <form action="CourseServlet?method=search" method="post" onsubmit="return check()"> <div class="a"> 課程名稱<input type="text" id="name" name="name"/> </div> <div class="a"> 任課教師<input type="text" id="teacher" name="teacher" /> </div> <div class="a"> 上課地點<input type="text" id="classroom" name="classroom" /> </div> <div class="a"> <button type="submit" class="b">查 詢</button> </div> </form> </div> <script type="text/javascript"> function check() { var name = document.getElementById("name");; var teacher = document.getElementById("teacher"); var classroom = document.getElementById("classroom"); //非空 if(name.value == '' && teacher.value == '' && classroom.value == '') { alert('請填寫一個條件'); return false; } } </script> </body> </html>
11、顯示全部的課程資訊
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> <style> .a{ margin-top: 20px; } .b{ font-size: 20px; width: 160px; color: white; background-color: greenyellow; } .tb, td { border: 1px solid black; font-size: 22px; } </style> </head> <body> <% Object message = request.getAttribute("message"); if(message!=null && !"".equals(message)){ %> <script type="text/javascript"> alert("<%=request.getAttribute("message")%>"); </script> <%} %> <div align="center"> <h1 style="color: red;">課程資訊列表</h1> <a href="index.jsp">返回主頁</a> <table class="tb"> <tr> <td>id</td> <td>課程名稱</td> <td>任課教師</td> <td>上課地點</td> <td align="center" colspan="2">操作</td> </tr> <c:forEach items="${courses}" var="item"> <tr> <td>${item.id}</td> <td>${item.name}</td> <td>${item.teacher}</td> <td>${item.classroom}</td> <td><a href="CourseServlet?method=getcoursebyid&id=${item.id}">修改</a></td> </tr> </c:forEach> </table> </div> </body> </html>