石家莊鐵道大學課程資訊管理系統（javaWeb+servlet+Mysql）
阿新 • • 發佈：2018-12-09
實現網頁版的課程管理系統，具有增刪改查的功能。
1、首先連線資料庫，具體資料庫的使用及如何連線eclipse，參考 https://blog.csdn.net/lrici/article/details/54380872。
本專案連線資料庫的程式碼如下：
package com.hjf.util; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement;/** * 資料庫連線工具 * @author Hu * */ public class DBUtil { public static String db_url = "jdbc:mysql://localhost:3306/test"; public static String db_user = "root"; //賬號 public static String db_pass = "root"; //密碼 public static Connection getConn () { Connection conn = null;try { Class.forName("com.mysql.jdbc.Driver");//載入驅動 conn = DriverManager.getConnection(db_url, db_user, db_pass); } catch (Exception e) { e.printStackTrace(); } return conn; } /** * 關閉連線 * @param state * @paramconn */ public static void close (Statement state, Connection conn) { if (state != null) { try { state.close(); } catch (SQLException e) { e.printStackTrace(); } } if (conn != null) { try { conn.close(); } catch (SQLException e) { e.printStackTrace(); } } } public static void close (ResultSet rs, Statement state, Connection conn) { if (rs != null) { try { rs.close(); } catch (SQLException e) { e.printStackTrace(); } } if (state != null) { try { state.close(); } catch (SQLException e) { e.printStackTrace(); } } if (conn != null) { try { conn.close(); } catch (SQLException e) { e.printStackTrace(); } } } }
2 在建立一個Course類，其中含有 id，name，teacher，classroom。
原始碼如下：
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。
原始碼如下：
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。
原始碼如下：
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。
原始碼如下：
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。
主頁面設定，原始碼如下：
<%@ 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")%>");