随堂测验——添加课程信息

要求：

添加课程信息

（1）新课程信息必须唯一，如有重复，提示用户“课程名称重复，重新录入”；

（2）要求判断任课教师为王建民、刘立嘉、刘丹、王辉、杨子光五位教师的其中一位。

（3）要求上课地点开头为“一教、二教、三教、基教”中的一种；

（4）将新课程信息添加入库。

实现：

package dao;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;
import DBUtil.DBUtil;
import domain.Course;
public class CourseDao {
    public boolean add(Course course) {
        String sql = "insert into test(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 (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            
            DBUtil.close(state, conn);
        }
        if(a>0)
            f=true;
        return f;
        }
}

package DBUtil;

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

public class DBUtil {

    public static String db_url = "jdbc:mysql://localhost:3306/course?serverTimezone=GMT%2B8&useSSL=false";
    public static String db_user = "root";
    public static String db_pass = "0424wyhhxx";

    public static Connection getConn () {
        Connection conn = null;

        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn = DriverManager.getConnection(db_url, db_user, db_pass);
        } catch (Exception e) {
            e.printStackTrace();
        }

        return conn;
    }//end getConn

    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();
            }
        }
    }

    public static void main(String[] args) throws SQLException {
        Connection conn = getConn();
        PreparedStatement pstmt = null;
        ResultSet rs = null;
        String sql ="select * from test";
        pstmt = conn.prepareStatement(sql);
        rs = pstmt.executeQuery();
        if(rs.next()){
            System.out.println("成功");
        }else{
            System.out.println("失败");
        }
    }
}

package domain;

public class Course {

    private String name;
    private String teacher;
    private String classroom;
     

    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(String name, String teacher, String classroom) {
        
        this.name = name;
        this.teacher = teacher;
        this.classroom = classroom;
    }
}

package servlet;

import java.io.IOException;
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 dao.CourseDao;
import domain.Course;

/**
 * Servlet implementation class AddServlet
 */
@WebServlet("/addServlet")
public class AddServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public AddServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        request.setCharacterEncoding("utf-8");
        String name =request.getParameter("name");
        String teacher = request.getParameter("teacher");
        String classroom =request.getParameter("classroom");
        Course course = new Course(name, teacher, classroom);
        CourseDao cd = new CourseDao(); 
        
        if(!cd.add(course)) {
            request.setAttribute("message","添加成功");
            request.getRequestDispatcher("add.jsp").forward(request,response);
        } else {
            request.setAttribute("message", "添加失败，请重新录入");
            request.getRequestDispatcher("add.jsp").forward(request,response);
        }
        
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}

<%@ 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;
    }
    body{
          padding:20px 0px;
          background-color:pink;
          text-align:center;
          }
     form button:hover{
      background-color:#6666FF;
     }
</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>
        <form action="${pageContext.request.contextPath }/addServlet" 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 type="text/javascript">      
</body>
</html>

 测试截图：