JSP + Servlet + JDBC + Mysql 实现增删改查 课程管理系统

1.项目目录结构

2.项目环境

Eclipse IDE  MYSQL  jdk tomcat

jar包

3.数据库相关配置

先创建一个course的数据库名，然后在建立一个course的表

要注意将id字段 自动递增

 4.源代码

    1.Course.java

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(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;
	}
}

　　2.DBUtil.java

package com.hjf.util;

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

/**
 * 数据库连接工具
 * @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 = "199126";
	
	public static Connection getConn () {
		Connection conn = null;
		
		try {
			Class.forName("com.mysql.jdbc.Driver");//加载驱动
			conn = DriverManager.getConnection(db_url, db_user, db_pass);
		} catch (Exception e) {
			e.printStackTrace();
		}
		
		return conn;
	}
	
	/**
	 * 关闭连接
	 * @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();
			}
		}
	}

}

　　3.CourseDao.java

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;

/**
 * 课程Dao
 * Dao层操作数据
 * @author zhang
 *
 */
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;
	}

}

　　

4.CourseServlet.java

package com.hjf.servelt;

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();
	
	/**
	 * 方法选择
	 */
	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);
		}
	}

	/**
	 * 添加
	 * @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);
		
		//添加后消息显示
		if(service.add(course)) {
			req.setAttribute("message", "添加成功");
			req.getRequestDispatcher("add.jsp").forward(req,resp);
		} else {
			req.setAttribute("message", "课程名称重复，请重新录入");
			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);
	}

	/**
	 * 通过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);
	}

	/**
	 * 通过名字查找
	 * 跳转至删除
	 * @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", "查无此课程！");
			req.getRequestDispatcher("del.jsp").forward(req,resp);
		} else {
			req.setAttribute("course", course);
			req.getRequestDispatcher("detail.jsp").forward(req,resp);
		}
	}
	
	/**
	 * 删除
	 * @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", "删除成功！");
		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);
	}
	
	/**
	 * 查找
	 * @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);
	}
}

　　5.CourseService.java

package com.hjf.service;

import java.util.List;

import com.hjf.dao.CourseDao;
import com.hjf.entity.Course;

/**
 * CourseService
 * 服务层
 * @author zhang
 *
 */
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;
	}
	
	/**
	 * 删除
	 */
	public void del(int id) {
		cDao.delete(id);
	}
	
	/**
	 * 修改
	 * @return 
	 */
	public void update(Course course) {
		cDao.update(course);
	}
	
	/**
	 * 通过ID得到一个Course
	 * @return 
	 */
	public Course getCourseById(int id) {
		return cDao.getCourseById(id);
	}

	/**
	 * 通过Name得到一个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);
	}
	
	/**
	 * 全部数据
	 * @return 
	 */
	public List<Course> list() {
		return cDao.list();
	}
}

　　6.add.jsp

<%@ 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;">课程信息录入</h1>
		<a href="index.jsp">返回主页</a>
		<form action="CourseServlet?method=add" method="post" onsubmit="return check()">
			<div class="a">
				课程名称<input type="text" id="name" name="name"/>
			</div>
			<div class="a">
				任课教师<input type="text" id="teacher" name="teacher" />
			</div>
			<div class="a">
				上课地点<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('课程名称为空');
				name.focus();
				return false;
			}
			if(teacher.value == '') {
				alert('教师为空');
				teacher.focus();
				return false;
			}
			if(classroom.value == '') {
				alert('上课地点为空');
				classroom.focus();
				return false;
			}
			
			//教师
			if(teacher.value != '王建民' && teacher.value != '王辉' && teacher.value != '刘丹' && teacher.value != '刘立嘉' && teacher.value != '杨子光'){
				alert('教师名称错误');
				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('上课地点错误');
				return false;
			}
		}
	</script>
</body>
</html>

　　7.del.jsp

<%@ 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;">课程信息删除</h1>
		<a href="index.jsp">返回主页</a>
		<form action="CourseServlet?method=getcoursebyname" method="post" onsubmit="return check()">
			<div class="a">
				课程名称<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('课程名称为空');
				name.focus();
				return false;
			}
		}
	</script>
</body>
</html>

　　8.detail.jsp

<%@ 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;">课程信息删除</h1>
		<a href="index.jsp">返回主页</a>
		<table class="tb">
			<tr>
				<td>课程名称</td>
				<td>${course.name}</td>
			</tr>
			<tr>
				<td>任课教师</td>
				<td>${course.teacher}</td>
			</tr>
			<tr>
				<td>上课地点</td>
				<td>${course.classroom}</td>
			</tr>
		</table>
		<div class="a">
			<a onclick="return check()" href="CourseServlet?method=del&id=${course.id}">删   除</a>
		</div>
	</div>
	<script type="text/javascript">
		function check() {
			if (confirm("真的要删除吗？")){
				return true;
			}else{
				return false;
			}
		}
	</script>
</body>
</html>

　　9.detail2.jsp

<%@ 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;">课程信息修改</h1>
		<a href="index.jsp">返回主页</a>
		<form action="CourseServlet?method=update" method="post" onsubmit="return check()">
			<div class="a">
				课程名称<input type="text" id="name" name="name" value="${course.name}"/>
			</div>
			<div class="a">
				任课教师<input type="text" id="teacher" name="teacher" value="${course.teacher}"/>
			</div>
			<div class="a">
				上课地点<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('课程名称为空');
				name.focus();
				return false;
			}
			if(teacher.value == '') {
				alert('教师为空');
				teacher.focus();
				return false;
			}
			if(classroom.value == '') {
				alert('上课地点为空');
				classroom.focus();
				return false;
			}
			
			//教师
			if(teacher.value != '王建民' && teacher.value != '王辉' && teacher.value != '刘丹' && teacher.value != '刘立嘉' && teacher.value != '杨子光'){
				alert('教师名称错误');
				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('上课地点错误');
				return false;
			}
		}
	</script>
</body>
</html>

　　10.index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>首页</title>
<style>
	.a{
		font-size: 26px;
		margin-top: 20px;
	}
</style>
</head>
<body>
	<div align="center">
		<h1 style="color: red;">课程基本信息管理系统</h1>
		<div class="a">
			<a href="add.jsp">课程信息录入</a>
		</div>
		<div class="a">
			<a href="CourseServlet?method=list">课程信息修改</a>
		</div>
		<div class="a">
			<a href="del.jsp">课程信息删除</a>
		</div>
		<div class="a">
			<a href="search.jsp">课程信息查询</a>
		</div>
	</div>
</body>
</html>

　　11.list.jsp

<%@ 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;">课程信息列表</h1>
		<a href="index.jsp">返回主页</a>
		<table class="tb">
			<tr>
				<td>id</td>
				<td>课程名称</td>
				<td>任课教师</td>
				<td>上课地点</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>

　　

 12.search.jsp

<%@ 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;">课程信息查询</h1>
		<a href="index.jsp">返回主页</a>
		<form action="CourseServlet?method=search" method="post" onsubmit="return check()">
			<div class="a">
				课程名称<input type="text" id="name" name="name"/>
			</div>
			<div class="a">
				任课教师<input type="text" id="teacher" name="teacher" />
			</div>
			<div class="a">
				上课地点<input type="text" id="classroom" name="classroom" />
			</div>
			<div class="a">
				<button type="submit" class="b">查   询</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('请填写一个条件');
				return false;
			}
		}
	</script>
</body>
</html>

　　13.searchlist.jsp

<%@ 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>
	<div align="center">
		<h1 style="color: red;">课程信息列表</h1>
		<a href="index.jsp">返回主页</a>
		<table class="tb">
			<tr>
				<td>id</td>
				<td>课程名称</td>
				<td>任课教师</td>
				<td>上课地点</td>
			</tr>
			<!-- forEach遍历出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>