javaweb课程信息管理系统

1、DBUtil包连接数据库

2、Bin包设计成员函数及方法

3、Dao包设计sql语句

4、servlet包增删改查方法

5、service连接servlet

6、设计jsp增删改查页面

7、连接各个页面

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 util.Util;

import bin.Course;

/**
 * 课程Dao
 * Dao层操作数据
 * @author YP
 */
public class CourseDao {
    /**
     * 添加
     * @param course
     * @return
     */
    public boolean add(Course course) {
        String sql = "insert into course(name, teach, local) values('" + course.getName() + "','" + course.getTeach() + "','" + course.getLocal() + "')";
        //创建数据库链接
        Connection conn = Util.getConn();
        Statement state = null;
        boolean f = false;
        int a = 0;
        try {
            state = conn.createStatement();
            state.executeUpdate(sql);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            //关闭连接
            Util.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 = Util.getConn();
        Statement state = null;
        int a = 0;
        try {
            state = conn.createStatement();
            a = state.executeUpdate(sql);
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            Util.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() + "', teach='" + course.getTeach() + "', local='" + course.getLocal()
            + "' where id='" + course.getId() + "'";
        Connection conn = Util.getConn();
        Statement state = null;
        boolean f = false;
        int a = 0;
        try {
            state = conn.createStatement();
            a = state.executeUpdate(sql);
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            Util.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 = Util.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 {
            Util.close(rs, state, conn);
        }
        return flag;
    }
    /**
     * 通过ID得到课程信息
     * @param id
     * @return
     */
    public Course getCourseById(int id) {
        String sql = "select * from course where id ='" + id + "'";
        Connection conn = Util.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 teach = rs.getString("teach");
                String local = rs.getString("local");
                course = new Course(id, name, teach, local);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            Util.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 = Util.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 teach = rs.getString("teach");
                String local = rs.getString("local");
                course = new Course(id, name, teach, local);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            Util.close(rs, state, conn);
        }
        return course;
    }
    /**
     * 查找
     * @param name
     * @param teach
     * @param local
     * @return
     */
    public List<Course> find(String name, String teach, String local) {
        String sql = "select * from course where ";
        if (name != "") {
            sql += "name like '%" + name + "%'";
        }
        if (teach != "") {
            sql += "teach like '%" + teach + "%'";
        }
        if (local != "") {
            sql += "local like '%" + local + "%'";
        }
        List<Course> list = new ArrayList<>();
        Connection conn = Util.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 teach2 = rs.getString("teach");
                String local2 = rs.getString("local");
                bean = new Course(id, name2, teach2, local2);
                list.add(bean);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            Util.close(rs, state, conn);
        }    
        return list;
    }
    /**
     * 全部数据
     * @param name
     * @param teach
     * @param local
     * @return
     */
    public List<Course> list() {
        String sql = "select * from course";
        List<Course> list = new ArrayList<>();
        Connection conn = Util.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 teach2 = rs.getString("teach");
                String local2 = rs.getString("local");
                bean = new Course(id, name2, teach2, local2);
                list.add(bean);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            Util.close(rs, state, conn);
        }    
        return list;
    }
}

package serverlet;

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 bin.Course;
import service.Service;

@WebServlet("/CourseServlet")
public class CourseServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    Service service = new Service();
    /**
     * 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 ("delete".equals(method)) {
            delete(req, resp);
        } else if ("update".equals(method)) {
            update(req, resp);
        } else if ("find".equals(method)) {
            find(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*/
    private void add(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException {
        req.setCharacterEncoding("utf-8");
        //获取数据
        String name = req.getParameter("name");
        String teach = req.getParameter("teach");
        String local = req.getParameter("local");
        Course course = new Course(name, teach, local);
        //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*/
    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("update.jsp").forward(req,resp);
    }
    /**
     * 通过名字查找
     * 跳转至删除*/
    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("delete.jsp").forward(req,resp);
        } else {
            req.setAttribute("course", course);
            req.getRequestDispatcher("deletelist.jsp").forward(req,resp);
        }
    }
    /**
     * 删除*/
    private void delete(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
        req.setCharacterEncoding("utf-8");
        int id = Integer.parseInt(req.getParameter("id"));
        service.delete(id);
        req.setAttribute("message", "删除成功！");
        req.getRequestDispatcher("delete.jsp").forward(req,resp);
    }
    /**
     * 修改*/
    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 teach = req.getParameter("teach");
        String local = req.getParameter("local");
        Course course = new Course(id, name, teach, local);    
        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 find(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
        req.setCharacterEncoding("utf-8");
        String name = req.getParameter("name");
        String teach = req.getParameter("teach");
        String local = req.getParameter("local");
        List<Course> courses = service.find(name, teach, local);
        req.setAttribute("courses", courses);
        req.getRequestDispatcher("findlist.jsp").forward(req,resp);
    }
}

package service;

import java.util.List;

import dao.CourseDao;
import bin.Course;

/**
 * CourseService
 * 服务层
 * @author YP
 *
 */
public class Service {
    CourseDao cDao = new CourseDao();
    /**
     * 添加
     */
    public boolean add(Course course) {
        boolean f = false;
        if(!cDao.name(course.getName())) {
            cDao.add(course);
            f = true;
        }
        return f;
    }
    /**
     * 删除
     */
    public void delete(int id) {
        cDao.delete(id);
    }
    /**
     * 修改
     */
    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Course
     */
    public Course getCourseByName(String name) {
        return cDao.getCourseByName(name);
    }
    /**
     * 查找
     */
    public List<Course> find(String name, String teacher, String classroom) {
        return cDao.find(name, teacher, classroom);
    }
    /**
     * 全部数据
     */
    public List<Course> list() {
        return cDao.list();
    }
}

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>新增课程</title>
</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: black;">课程信息录入</h1>
        <a href="main.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="teach" name="teach" />
            </div>
            <div class="a">
                上课地点<input type="text" id="local" name="local" />
            </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 teach = document.getElementById("teach");
            var local = document.getElementById("local");
            //非空
            if(name.value == '') {
                alert('课程名称为空');
                name.focus();
                return false;
            }
            if(teach.value == '') {
                alert('教师为空');
                teach.focus();
                return false;
            }
            if(local.value == '') {
                alert('上课地点为空');
                local.focus();
                return false;
            }
            //教师
            if(teach.value != '王建民' && teach.value != '王辉' && teach.value != '刘丹' && teach.value != '刘立嘉' && teach.value != '杨子光'){
                alert('教师名称错误');
                return false;
            }
            //教室
            if(!/^基教/.test(local.value) && !/^一教/.test(local.value) && !/^二教/.test(local.value) && !/^三教/.test(local.value)) {
                alert('上课地点错误');
                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>删除查询</title>
</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: black;">课程信息删除</h1>
        <a href="main.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&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('课程名称为空');
                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>删除界面</title>
</head>
<body>
    <div align="center">
        <h1 style="color: black;">课程信息删除</h1>
        <a href="main.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.teach}</td>
            </tr>
            <tr>
                <td>上课地点</td>
                <td>${course.local}</td>
            </tr>
        </table>
        <div class="a">
            <a onclick="return check()" href="CourseServlet?method=delete&id=${course.id}">删&nbsp;&nbsp;&nbsp;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>

<%@ 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>显示</title>
</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: black;">课程信息列表</h1>
        <a href="main.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>操作</td>
            </tr>
            <c:forEach items="${courses}" var="item" varStatus="status">
                <tr>
                    <td>${item.id}</td>
                    <td>${item.name}</td>
                    <td>${item.teach}</td>
                    <td>${item.local}</td>
                    <td><a href="CourseServlet?method=getcoursebyid&id=${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>修改课程信息页面</title>
</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: black;">课程信息修改</h1>
        <a href="main.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="${course.name}"/>
            </div>
            <div class="a">
                任课教师<input type="text" id="teach" name="teach" value="${course.teach}"/>
            </div>
            <div class="a">
                上课地点<input type="text" id="local" name="local" value="${course.local}"/>
            </div>
            <input type="hidden" id="id" name="id" value="${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 teach = document.getElementById("teach");
            var local = document.getElementById("local");
            //非空
            if(name.value == '') {
                alert('课程名称为空');
                name.focus();
                return false;
            }
            if(teach.value == '') {
                alert('教师为空');
                teach.focus();
                return false;
            }
            if(local.value == '') {
                alert('上课地点为空');
                local.focus();
                return false;
            }
            //教师
            if(teach.value != '王建民' && teach.value != '王辉' && teach.value != '刘丹' && teach.value != '刘立嘉' && teach.value != '杨子光'){
                alert('教师名称错误');
                return false;
            }
            //教室
            if(!/^基教/.test(local.value) && !/^一教/.test(local.value) && !/^二教/.test(local.value) && !/^三教/.test(local.value)) {
                alert('上课地点错误');
                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>查找界面</title>
</head>
<body>
    <div align="center">
        <h1 style="color: black;">课程信息查询</h1>
        <a href="main.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="teach" name="teach" />
            </div>
            <div class="a">
                上课地点<input type="text" id="local" name="local" />
            </div>
            <div class="a">
                <button type="submit" class="b">查&nbsp;&nbsp;&nbsp;询</button>
            </div>
        </form>
    </div>
    <script type="text/javascript">
        function check() {
            var name = document.getElementById("name");
            var teach = document.getElementById("teach");
            var local = document.getElementById("local");
            //非空
            if(name.value == '' && teach.value == '' && local.value == '') {
                alert('请填写一个条件');
                return false;
            }
        }
    </script>
</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>查询结果</title>
</head>
<body>
    <div align="center">
        <h1 style="color: black;">课程信息列表</h1>
        <a href="main.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>${item.name}</td>
                    <td>${item.teach}</td>
                    <td>${item.local}</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>首页</title>
</head>
<body>
    <h1 style="font-family:宋体;font-size:1.5em; 550px" align="right">课程信息管理系统</h1>
    <div align="center">
        <div class="a">
            <a href="add.jsp">课程信息添加</a>
        </div>
        <div class="a">
            <a href="CourseServlet?method=list">课程信息修改</a>
        </div>
        <div class="a">
            <a href="delete.jsp">课程信息删除</a>
        </div>
        <div class="a">
            <a href="find.jsp">课程信息查询</a>
        </div>
    </div>
</body>
</html>