课程信息管理系统

1系统的设计分为两部分，一部分是Javabean，一部分是jsp界面的设计

javabean

CourseDao.java(数据库和daos交互)

package 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 entity.Course;
import util.DBUtil;
/**
 * 课程Dao
 * Dao层操作数据
 * 
 *
 */
public class CourseDao {
    /**
     * 添加
     * @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;
    }

    /**
     * 删除
     * 
     * @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;
    }
    
    /**
     * 验证课程名称是否唯一
     * 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;
    }
    
    /**
     * 通过ID得到类
     * @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;
    }
    
    /**
     * 通过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;
    }
    
    /**
     * 查找
     * @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;
    }
    
    /**
     * 全部数据
     * @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;
    }
}

Course.java（数据）

 1 package entity;
 2 
 3 public class Course {
 4     private int id;
 5     private String name;
 6     private String teacher;
 7     private String classroom;
 8     
 9     public int getId() {
10         return id;
11     }
12     public void setId(int id) {
13         this.id = id;
14     }
15     public String getName() {
16         return name;
17     }
18     public void setName(String name) {
19         this.name = name;
20     }
21     public String getTeacher() {
22         return teacher;
23     }
24     public void setTeacher(String teacher) {
25         this.teacher = teacher;
26     }
27     public String getClassroom() {
28         return classroom;
29     }
30     public void setClassroom(String classroom) {
31         this.classroom = classroom;
32     }
33     
34     public Course() {}
35     
36     public Course(int id, String name, String teacher, String classroom) {
37         this.id = id;
38         this.name = name;
39         this.teacher = teacher;
40         this.classroom = classroom;
41     }
42     
43     public Course(String name, String teacher, String classroom) {
44         this.name = name;
45         this.teacher = teacher;
46         this.classroom = classroom;
47     }
48 }

Courseservice.java

 1 package service;
 2 import java.util.List;
 3 import dao.CourseDao;
 4 import entity.Course;
 5 
 6 /**
 7  * CourseService
 8  * 服务层
 9  * 
10  *
11  */
12 public class CourseService {
13 CourseDao cDao = new CourseDao();
14     
15     /**
16      * 添加
17      * @param course
18      * @return
19      */
20     public boolean add(Course course) {
21         boolean f = false;
22         if(!cDao.name(course.getName())) {
23             cDao.add(course);
24             f = true;
25         }
26         return f;
27     }
28     
29     /**
30      * 删除
31      */
32     public void del(int id) {
33         cDao.delete(id);
34     }
35     
36     /**
37      * 修改
38      * @return 
39      */
40     public void update(Course course) {
41         cDao.update(course);
42     }
43     
44     /**
45      * 通过ID得到一个Course
46      * @return 
47      */
48     public Course getCourseById(int id) {
49         return cDao.getCourseById(id);
50     }
51 
52     /**
53      * 通过Name得到一个Course
54      * @return 
55      */
56     public Course getCourseByName(String name) {
57         return cDao.getCourseByName(name);
58     }
59     
60     /**
61      * 查找
62      * @return 
63      */
64     public List<Course> search(String name, String teacher, String classroom) {
65         return cDao.search(name, teacher, classroom);
66     }
67     
68     /**
69      * 全部数据
70      * @return 
71      */
72     public List<Course> list() {
73         return cDao.list();
74     }
75 }

Courseservlet.java

  1 package servlet;
  2 import java.io.IOException;
  3 import java.util.List;
  4 
  5 import javax.servlet.ServletException;
  6 import javax.servlet.annotation.WebServlet;
  7 import javax.servlet.http.HttpServlet;
  8 import javax.servlet.http.HttpServletRequest;
  9 import javax.servlet.http.HttpServletResponse;
 10 
 11 import entity.Course;
 12 import service.CourseService;
 13 
 14 /**
 15  * Servlet implementation class CourseServlet
 16  */
 17 @WebServlet("/CourseServlet")
 18 public class CourseServlet extends HttpServlet {
 19     private static final long serialVersionUID = 1L;
 20     CourseService service = new CourseService();
 21     /**
 22      * Default constructor. 
 23      */
 24     /**
 25      * 方法选择
 26      */
 27     protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
 28         req.setCharacterEncoding("utf-8");
 29         String method = req.getParameter("method");
 30         if ("add".equals(method)) {
 31             add(req, resp);
 32         } else if ("del".equals(method)) {
 33             del(req, resp);
 34         } else if ("update".equals(method)) {
 35             update(req, resp);
 36         } else if ("search".equals(method)) {
 37             search(req, resp);
 38         } else if ("getcoursebyid".equals(method)) {
 39             getCourseById(req, resp);
 40         } else if ("getcoursebyname".equals(method)) {
 41             getCourseByName(req, resp);
 42         } else if ("list".equals(method)) {
 43             list(req, resp);
 44         }
 45     }
 46 
 47     /**
 48      * 添加
 49      * @param req
 50      * @param resp
 51      * @throws IOException 
 52      * @throws ServletException 
 53      */
 54     private void add(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException {
 55         req.setCharacterEncoding("utf-8");
 56         String name = req.getParameter("name");
 57         String teacher = req.getParameter("teacher");
 58         String classroom = req.getParameter("classroom");
 59         Course course = new Course(name, teacher, classroom);
 60         
 61         //添加后消息显示
 62         if(service.add(course)) {
 63             req.setAttribute("message", "添加成功");
 64             req.getRequestDispatcher("add.jsp").forward(req,resp);
 65         } else {
 66             req.setAttribute("message", "课程名称重复，请重新录入");
 67             req.getRequestDispatcher("add.jsp").forward(req,resp);
 68         }
 69     }
 70     
 71     /**
 72      * 全部
 73      * @param req
 74      * @param resp
 75      * @throws ServletException 
 76      */
 77     private void list(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
 78         req.setCharacterEncoding("utf-8");
 79         List<Course> courses = service.list();
 80         req.setAttribute("courses", courses);
 81         req.getRequestDispatcher("list.jsp").forward(req,resp);
 82     }
 83 
 84     /**
 85      * 通过ID得到Course
 86      * @param req
 87      * @param resp
 88      * @throws ServletException 
 89      */
 90     private void getCourseById(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
 91         req.setCharacterEncoding("utf-8");
 92         int id = Integer.parseInt(req.getParameter("id"));
 93         Course course = service.getCourseById(id);
 94         req.setAttribute("course", course);
 95         req.getRequestDispatcher("detail2.jsp").forward(req,resp);
 96     }
 97 
 98     /**
 99      * 通过名字查找
100      * 跳转至删除
101      * @param req
102      * @param resp
103      * @throws IOException
104      * @throws ServletException 
105      */
106     private void getCourseByName(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
107         req.setCharacterEncoding("utf-8");
108         String name = req.getParameter("name");
109         Course course = service.getCourseByName(name);
110         if(course == null) {
111             req.setAttribute("message", "查无此课程！");
112             req.getRequestDispatcher("del.jsp").forward(req,resp);
113         } else {
114             req.setAttribute("course", course);
115             req.getRequestDispatcher("detail.jsp").forward(req,resp);
116         }
117     }
118     
119     /**
120      * 删除
121      * @param req
122      * @param resp
123      * @throws IOException
124      * @throws ServletException 
125      */
126     private void del(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
127         req.setCharacterEncoding("utf-8");
128         int id = Integer.parseInt(req.getParameter("id"));
129         service.del(id);
130         req.setAttribute("message", "删除成功！");
131         req.getRequestDispatcher("del.jsp").forward(req,resp);
132     }
133     
134     /**
135      * 修改
136      * @param req
137      * @param resp
138      * @throws IOException
139      * @throws ServletException 
140      */
141     private void update(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
142         req.setCharacterEncoding("utf-8");
143         int id = Integer.parseInt(req.getParameter("id"));
144         String name = req.getParameter("name");
145         String teacher = req.getParameter("teacher");
146         String classroom = req.getParameter("classroom");
147         Course course = new Course(id, name, teacher, classroom);
148         
149         service.update(course);
150         req.setAttribute("message", "修改成功");
151         req.getRequestDispatcher("CourseServlet?method=list").forward(req,resp);
152     }
153     
154     /**
155      * 查找
156      * @param req
157      * @param resp
158      * @throws ServletException 
159      */
160     private void search(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
161         req.setCharacterEncoding("utf-8");
162         String name = req.getParameter("name");
163         String teacher = req.getParameter("teacher");
164         String classroom = req.getParameter("classroom");
165         List<Course> courses = service.search(name, teacher, classroom);
166         req.setAttribute("courses", courses);
167         req.getRequestDispatcher("searchlist.jsp").forward(req,resp);
168     }
169 }

DBUtil.java（连接数据库）

 1 package util;
 2 
 3 import java.sql.Connection;
 4 import java.sql.DriverManager;
 5 import java.sql.ResultSet;
 6 import java.sql.SQLException;
 7 import java.sql.Statement;
 8 
 9 /**
10  * 数据库连接工具
11 
12  *
13  */
14 public class DBUtil {
15     public static String db_url = "jdbc:mysql://localhost:3306/course?useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT";
16     public static String db_user = "root";
17     public static String db_pass = "root";
18     
19     public static Connection getConn () {
20         Connection conn = null;
21         
22         try {
23             Class.forName("com.mysql.cj.jdbc.Driver");//加载驱动
24             System.out.println("驱动包连接成功");
25             conn = DriverManager.getConnection(db_url, db_user, db_pass);
26             System.out.println("连接成功");
27         } catch (Exception e) {
28             System.out.println("连接失败");
29             e.printStackTrace();
30         }
31         
32         return conn;
33     }
34     
35     /**
36      * 关闭连接
37      * @param state
38      * @param conn
39      */
40     public static void close (Statement state, Connection conn) {
41         if (state != null) {
42             try {
43                 state.close();
44             } catch (SQLException e) {
45                 e.printStackTrace();
46             }
47         }
48         
49         if (conn != null) {
50             try {
51                 conn.close();
52             } catch (SQLException e) {
53                 e.printStackTrace();
54             }
55         }
56     }
57     
58     public static void close (ResultSet rs, Statement state, Connection conn) {
59         if (rs != null) {
60             try {
61                 rs.close();
62             } catch (SQLException e) {
63                 e.printStackTrace();
64             }
65         }
66         
67         if (state != null) {
68             try {
69                 state.close();
70             } catch (SQLException e) {
71                 e.printStackTrace();
72             }
73         }
74         
75         if (conn != null) {
76             try {
77                 conn.close();
78             } catch (SQLException e) {
79                 e.printStackTrace();
80             }
81         }
82     }
83 }

jsp

add.jsp（课程信息录入子页）

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="UTF-8">
 7 <title>Insert title here</title>
 8 <style>
 9     .a{
10         margin-top: 20px;
11     }
12     .b{
13         font-size: 20px;
14          160px;
15         color: white;
16         background-color: greenyellow;
17     }
18 </style>
19 </head>
20 <body>
21     <%
22          Object message = request.getAttribute("message");
23          if(message!=null && !"".equals(message)){
24      
25     %>
26          <script type="text/javascript">
27               alert("<%=request.getAttribute("message")%>");
28          </script>
29     <%} %>
30     <div align="center">
31         <h1 style="color: red;">课程信息录入</h1>
32         <a href="index.jsp">返回主页</a>
33         <form action="CourseServlet?method=add" method="post" onsubmit="return check()">
34             <div class="a">
35                 课程名称<input type="text" id="name" name="name"/>
36             </div>
37             <div class="a">
38                 任课教师<input type="text" id="teacher" name="teacher" />
39             </div>
40             <div class="a">
41                 上课地点<input type="text" id="classroom" name="classroom" />
42             </div>
43             <div class="a">
44                 <button type="submit" class="b">保&nbsp;&nbsp;&nbsp;存</button>
45             </div>
46         </form>
47     </div>
48     <script type="text/javascript">
49         function check() {
50             var name = document.getElementById("name");;
51             var teacher = document.getElementById("teacher");
52             var classroom = document.getElementById("classroom");
53             
54             //非空
55             if(name.value == '') {
56                 alert('课程名称为空');
57                 name.focus();
58                 return false;
59             }
60             if(teacher.value == '') {
61                 alert('教师为空');
62                 teacher.focus();
63                 return false;
64             }
65             if(classroom.value == '') {
66                 alert('上课地点为空');
67                 classroom.focus();
68                 return false;
69             }
70             
71             //教师
72             if(teacher.value != '王建民' && teacher.value != '王辉' && teacher.value != '刘丹' && teacher.value != '刘立嘉' && teacher.value != '杨子光'){
73                 alert('教师名称错误');
74                 return false;
75             }
76             
77             //教室
78             if(!/^基教/.test(classroom.value) && !/^一教/.test(classroom.value) && !/^二教/.test(classroom.value) && !/^三教/.test(classroom.value)) {
79                 alert('上课地点错误');
80                 return false;
81             }
82         }
83     </script>
84 </body>
85 </html>

del.jsp

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="UTF-8">
 7 <title>Insert title here</title>
 8 <style>
 9     .a{
10         margin-top: 20px;
11     }
12     .b{
13         font-size: 20px;
14          160px;
15         color: white;
16         background-color: greenyellow;
17     }
18 </style>
19 </head>
20 <body>
21     <%
22          Object message = request.getAttribute("message");
23          if(message!=null && !"".equals(message)){
24      
25     %>
26          <script type="text/javascript">
27               alert("<%=request.getAttribute("message")%>");
28          </script>
29     <%} %>
30     <div align="center">
31         <h1 style="color: red;">课程信息删除</h1>
32         <a href="index.jsp">返回主页</a>
33         <form action="CourseServlet?method=getcoursebyname" method="post" onsubmit="return check()">
34             <div class="a">
35                 课程名称<input type="text" id="name" name="name"/>
36             </div>
37             <div class="a">
38                 <button type="submit" class="b">查&nbsp;&nbsp;&nbsp;找</button>
39             </div>
40         </form>
41     </div>
42     <script type="text/javascript">
43         function check() {
44             var name = document.getElementById("name");;
45             
46             //非空
47             if(name.value == '') {
48                 alert('课程名称为空');
49                 name.focus();
50                 return false;
51             }
52         }
53     </script>
54 </body>
55 </html>

detail.java（课程信息删除子页）

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="UTF-8">
 7 <title>Insert title here</title>
 8 <style>
 9     .a{
10         margin-top: 20px;
11     }
12     .b{
13         font-size: 20px;
14          160px;
15         color: white;
16         background-color: greenyellow;
17     }
18     .tb, td {
19         border: 1px solid black;
20         font-size: 22px;
21     }
22 </style>
23 </head>
24 <body>
25     <div align="center">
26         <h1 style="color: red;">课程信息删除</h1>
27         <a href="index.jsp">返回主页</a>
28         <table class="tb">
29             <tr>
30                 <td>课程名称</td>
31                 <td>${course.name}</td>
32             </tr>
33             <tr>
34                 <td>任课教师</td>
35                 <td>${course.teacher}</td>
36             </tr>
37             <tr>
38                 <td>上课地点</td>
39                 <td>${course.classroom}</td>
40             </tr>
41         </table>
42         <div class="a">
43             <a onclick="return check()" href="CourseServlet?method=del&id=${course.id}">删&nbsp;&nbsp;&nbsp;除</a>
44         </div>
45     </div>
46     <script type="text/javascript">
47         function check() {
48             if (confirm("真的要删除吗？")){
49                 return true;
50             }else{
51                 return false;
52             }
53         }
54     </script>
55 </body>
56 </html>

detail.jsp（课程信息修改子页）

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="UTF-8">
 7 <title>Insert title here</title>
 8 <style>
 9     .a{
10         margin-top: 20px;
11     }
12     .b{
13         font-size: 20px;
14          160px;
15         color: white;
16         background-color: greenyellow;
17     }
18 </style>
19 </head>
20 <body>
21     <%
22          Object message = request.getAttribute("message");
23          if(message!=null && !"".equals(message)){
24      
25     %>
26          <script type="text/javascript">
27               alert("<%=request.getAttribute("message")%>");
28          </script>
29     <%} %>
30     <div align="center">
31         <h1 style="color: red;">课程信息修改</h1>
32         <a href="index.jsp">返回主页</a>
33         <form action="CourseServlet?method=update" method="post" onsubmit="return check()">
34             <div class="a">
35                 课程名称<input type="text" id="name" name="name" value="${course.name}"/>
36             </div>
37             <div class="a">
38                 任课教师<input type="text" id="teacher" name="teacher" value="${course.teacher}"/>
39             </div>
40             <div class="a">
41                 上课地点<input type="text" id="classroom" name="classroom" value="${course.classroom}"/>
42             </div>
43             <input type="hidden" id="id" name="id" value="${course.id}"/>
44             <div class="a">
45                 <button type="submit" class="b">修&nbsp;&nbsp;&nbsp;改</button>
46             </div>
47         </form>
48     </div>
49     <script type="text/javascript">
50         function check() {
51             var name = document.getElementById("name");;
52             var teacher = document.getElementById("teacher");
53             var classroom = document.getElementById("classroom");
54             
55             //非空
56             if(name.value == '') {
57                 alert('课程名称为空');
58                 name.focus();
59                 return false;
60             }
61             if(teacher.value == '') {
62                 alert('教师为空');
63                 teacher.focus();
64                 return false;
65             }
66             if(classroom.value == '') {
67                 alert('上课地点为空');
68                 classroom.focus();
69                 return false;
70             }
71             
72             //教师
73             if(teacher.value != '王建民' && teacher.value != '王辉' && teacher.value != '刘丹' && teacher.value != '刘立嘉' && teacher.value != '杨子光'){
74                 alert('教师名称错误');
75                 return false;
76             }
77             
78             //教室
79             if(!/^基教/.test(classroom.value) && !/^一教/.test(classroom.value) && !/^二教/.test(classroom.value) && !/^三教/.test(classroom.value)) {
80                 alert('上课地点错误');
81                 return false;
82             }
83         }
84     </script>
85 </body>
86 </html>

index.jsp（主页杰界面）

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="UTF-8">
 7 <title>首页</title>
 8 <style>
 9     .a{
10         font-size: 26px;
11         margin-top: 20px;
12     }
13 </style>
14 </head>
15 <body>
16     <div align="center">
17         <h1 style="color: red;">课程基本信息管理系统</h1>
18         <div class="a">
19             <a href="add.jsp">课程信息录入</a>
20         </div>
21         <div class="a">
22             <a href="CourseServlet?method=list">课程信息修改</a>
23         </div>
24         <div class="a">
25             <a href="del.jsp">课程信息删除</a>
26         </div>
27         <div class="a">
28             <a href="search.jsp">课程信息查询</a>
29         </div>
30     </div>
31 </body>
32 </html>

list.jsp

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 
 4 <!DOCTYPE html>
 5 <html>
 6 <head>
 7 <meta charset="UTF-8">
 8 <title>Insert title here</title>
 9 <style>
10     .a{
11         margin-top: 20px;
12     }
13     .b{
14         font-size: 20px;
15          160px;
16         color: white;
17         background-color: greenyellow;
18     }
19     .tb, td {
20         border: 1px solid black;
21         font-size: 22px;
22     }
23 </style>
24 </head>
25 <body>
26     <%
27          Object message = request.getAttribute("message");
28          if(message!=null && !"".equals(message)){
29      
30     %>
31          <script type="text/javascript">
32               alert("<%=request.getAttribute("message")%>");
33          </script>
34     <%} %>
35     <div align="center">
36         <h1 style="color: red;">课程信息列表</h1>
37         <a href="index.jsp">返回主页</a>
38         <table class="tb">
39             <tr>
40                 <td>id</td>
41                 <td>课程名称</td>
42                 <td>任课教师</td>
43                 <td>上课地点</td>
44                 <td align="center" colspan="2">操作</td>
45             </tr>
46             <c:forEach items="${courses}" var="item">
47                 <tr>
48                     <td>${item.id}</td>
49                     <td>${item.name}</td>
50                     <td>${item.teacher}</td>
51                     <td>${item.classroom}</td>
52                     <td><a href="CourseServlet?method=getcoursebyid&id=${item.id}">修改</a></td>
53                 </tr>
54             </c:forEach>
55         </table>
56     </div>
57 </body>
58 </html>

search.jsp

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html>
 4 <html>
 5 <head>
 6 <meta charset="UTF-8">
 7 <title>Insert title here</title>
 8 <style>
 9     .a{
10         margin-top: 20px;
11     }
12     .b{
13         font-size: 20px;
14          160px;
15         color: white;
16         background-color: greenyellow;
17     }
18 </style>
19 </head>
20 <body>
21     <div align="center">
22         <h1 style="color: red;">课程信息查询</h1>
23         <a href="index.jsp">返回主页</a>
24         <form action="CourseServlet?method=search" method="post" onsubmit="return check()">
25             <div class="a">
26                 课程名称<input type="text" id="name" name="name"/>
27             </div>
28             <div class="a">
29                 任课教师<input type="text" id="teacher" name="teacher" />
30             </div>
31             <div class="a">
32                 上课地点<input type="text" id="classroom" name="classroom" />
33             </div>
34             <div class="a">
35                 <button type="submit" class="b">查&nbsp;&nbsp;&nbsp;询</button>
36             </div>
37         </form>
38     </div>
39     <script type="text/javascript">
40         function check() {
41             var name = document.getElementById("name");;
42             var teacher = document.getElementById("teacher");
43             var classroom = document.getElementById("classroom");
44             
45             //非空
46             if(name.value == '' && teacher.value == '' && classroom.value == '') {
47                 alert('请填写一个条件');
48                 return false;
49             }
50         }
51     </script>
52 </body>
53 </html>

search.jsp

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 
 4 <!DOCTYPE html>
 5 <html>
 6 <head>
 7 <meta charset="UTF-8">
 8 <title>Insert title here</title>
 9 <style>
10     .a{
11         margin-top: 20px;
12     }
13     .b{
14         font-size: 20px;
15          160px;
16         color: white;
17         background-color: greenyellow;
18     }
19     .tb, td {
20         border: 1px solid black;
21         font-size: 22px;
22     }
23 </style>
24 </head>
25 <body>
26     <div align="center">
27         <h1 style="color: red;">课程信息列表</h1>
28         <a href="index.jsp">返回主页</a>
29         <table class="tb">
30             <tr>
31                 <td>id</td>
32                 <td>课程名称</td>
33                 <td>任课教师</td>
34                 <td>上课地点</td>
35             </tr>
36             <!-- forEach遍历出adminBeans -->
37             <c:forEach items="${courses}" var="item" varStatus="status">
38                 <tr>
39                     <td>${item.id}</td>
40                     <td><a>${item.name}</a></td>
41                     <td>${item.teacher}</td>
42                     <td>${item.classroom}</td>
43                 </tr>
44             </c:forEach>
45         </table>
46     </div>
47 </body>
48 </html>

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原文地址：https://www.cnblogs.com/dinghaisheng/p/10093347.html