首先建立數據庫的連接，新建web項目，點擊兩次next，勾選自動生成web.xml，將連接mysql的驅動jar包（mysql-connector-java-8.0.13-bin.jar）復制到WEB-INF下的lib目錄下。

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層操作數據
 * @author Hu
 *
 */
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;
	}

	/**
	 * 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;
	}
	
	/**
	 * 全部數據
	 * @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;
	}

}

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;
	}
}

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();
    
    /**
     * 添加
     * @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);
    }
    
    /**
     * 查找
     * @return 
     */
    public List<Course> search(String name, String teacher, String classroom) {
        return cDao.search(name, teacher, classroom);
    }
    
    /**
     * 全部數據
     * @return 
     */
    public List<Course> list() {
        return cDao.list();
    }
}

package com.hjf.util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

/**
 * 數據庫連接工具
 * @author Hu
 *
 */
public class DBUtil {
    
    public static String db_url = "jdbc:mysql://localhost:3306/course?useSSL=false";
    public static String db_user = "root";
    public static String db_pass = "123456";
    
    public static Connection getConn () {
        Connection conn = null;
        
        try {
            Class.forName("com.mysql.jdbc.Driver");//加載驅動
            conn = DriverManager.getConnection(db_url, db_user, db_pass);
        } catch (Exception e) {
            e.printStackTrace();
        }
        
        return conn;
    }
    
    /**
     * 關閉連接
     * @param state
     * @param conn
     */
    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();
            }
        }
    }

}

<%@ 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;
         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>課程信息錄入</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&nbsp;&nbsp;&nbsp;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>

<%@ 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;
         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>課程信息刪除</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&nbsp;&nbsp;&nbsp;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;
         160px;
        color: white;
        background-color: greenyellow;
    }
    .tb, td {
        border: 1px solid black;
        font-size: 22px;
    }
</style>
</head>
<body>
    <div align="center">
        <h1>課程信息刪除</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&nbsp;&nbsp;&nbsp;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>

<%@ 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;
         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>課程信息修改</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&nbsp;&nbsp;&nbsp;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>

<%@ 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>課程基本信息管理系統</h1>
        <div class="a">
            <a href="add.jsp">課程信息錄入</a>
        </div>
        <div class="a">
            <a href="CourseServlet?method=list">課程信息修改</a>
        </div>
        <div class="a">
            <a href="del.jsp">課程信息刪除</a>
        </div>
        <div class="a">
            <a href="search.jsp">課程信息查詢</a>
        </div>
    </div>
</body>
</html>

<%@ 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;
         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>課程信息列表</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>

<%@ 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;
         160px;
        color: white;
        background-color: greenyellow;
    }
</style>
</head>
<body>
    <div align="center">
        <h1>課程信息查詢</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&nbsp;&nbsp;&nbsp;詢</button>

<%@ 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;
         160px;
        color: white;
        background-color: greenyellow;
    }
    .tb, td {
        border: 1px solid black;
        font-size: 22px;
    }
</style>
</head>
<body>
    <div align="center">
        <h1>課程信息列表</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>
            </tr>
            <!-- forEach遍歷出adminBeans -->
            <c:forEach items="${courses}" var="item" varStatus="status">
                <tr>
                    <td>${item.id}</td>
                    <td><a>${item.name}</a></td>
                    <td>${item.teacher}</td>
                    <td>${item.classroom}</td>
                </tr>
            </c:forEach>
        </table>
    </div>
</body>
</html>

總結

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