课堂测试_WEB界面链接数据库

一，题目：

一、 考试要求：

1登录账号：要求由6到12位字母、数字、下划线组成，只有字母可以开头；（1分）

2登录密码：要求显示“• ”或“*”表示输入位数，密码要求八位以上字母、数字组成。（1分）

3性别：要求用单选框或下拉框实现，选项只有“男”或“女”；（1分）

4学号：要求八位数字组成，前四位为“2018”开头，输入自己学号；（1分）

5姓名：输入自己的姓名；

5电子邮箱：要求判断正确格式xxxx@xxxx.xxxx；（1分）

6点击“添加”按钮，将学生个人信息存储到数据库中。（3分）

7可以演示连接上数据库。（2分）

二，设计思路：

1，首先按要求编写出WEB网页。

2，在DB.java文件编写中对数据库进行连接和关闭的操作。

3，在Dao.java文件中编写对 sql 语句的拼接以及执行 sql 语句向数据库中添加东西的函数。

4，先在 .jsp 文件中对表单进行前端校验，将符合要求的传递给Selvlet.java.文件。

5，在Selvlet.java 文件导入DB.java文件和Dao.java文件并对表单进行二次校验。

6，若数据合法，调用DB.java的方法，连接数据库将数据通过参数的形式传递给在Dao.java文件中向数据库中添加东西的函数，将数据添加到数据库。若添加成功给出提示并返回WEB网页。若失败，给出提示，并返回WEB网页。

三，源代码

WEB网页：shangke.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>注册界面</title>
<script type="text/javascript">
/*表单校验*/
function check() {
    f=0;
    var re =  /^[\w\u4e00-\u9fa5]{6,8}$/;  //判断字符串是否为数字和字母组合  
    var myPattern = new RegExp("^[a-zA-Z]"); // 以英文字母开头
    var username = document.getElementById("username").value;
    //alert(username.length);
    if(!(username.length>5&&username.length<13)){
        alert("用户名长度错误！");return false;
    }
    else if(!(re.test(username))){
        alert("用户名组成内容错误！");return false;
    }else if(!(myPattern.exec(username))){
        alert("用户名开头必须是字母！");return false;
    }
    var password = document.getElementById("password").value;
    if(password.length<8){f++;alert("密码长度错误！");}    return false;
        
    
    var xuehao = document.getElementById("xuehao").value;
    if(xuehao.length!=8){
        alert("学号长度错误！");return false;
    }
    if(xuehao[0]=='2'&&xuehao[1]=='0'&&xuehao[2]=='1'&&xuehao[3]=='8'){f++;}
    else{
        alert("学号格式错误！");return false;
    }
    
    var mail = document.getElementById("mail").value;
    if(/^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(.[a-zA-Z0-9_-])+/.test(mail)){f++;}
    else{
        alert("邮箱格式错误！");return false;
    }
    if(f>1){
        alert("添加成功");
        return true;
    }
    else{
        return false;
    }
    
}

</script>
</head>
<body background="1.jpg">
<form action="UserServlet?method=add" method="post" onsubmit="return check()"><br/><br/><br/><br/><br/><br/><br/>
<table align="center">
            <tr>
            <td>登入账号：</td>
                <td><input type="text"  id="username" name="username" value="" ></td>
            </tr>
            <tr>
            <td>登入密码：</td>
               <td> <input type="password"  id="password" name="password"  value="" ></td>
            </tr>
            <tr>
            <td>性&nbsp;&nbsp;&nbsp;&nbsp;别：</td>
               <td>
               <select id="sex" name="sex" >
                    <option>--请选择--</option>
                        <option  value="男">男</option>
                        <option  value="女">女</option>
                    </select>
               </td>
            </tr>
            <tr>
            <td>姓&nbsp;&nbsp;&nbsp;&nbsp;名：</td>
               <td> <input type="text"  name="name"   value="" ></td>
            </tr>
            <tr>
            <td>学&nbsp;&nbsp;&nbsp;&nbsp;号：</td>
               <td> <input type="text"  name="xuehao" id="xuehao"  value="" ></td>
            </tr>
            <tr>
            <td>电子邮件：</td>
               <td> <input type="text" id="mail" name="mail"  value="" ></td>
            </tr>
            <tr>
            <td>所在学院：</td>
               <td> <input type="text" id="xueyuan" name="xueyuan"  value="" ></td>
            </tr>
            <tr>
            <td>所在系：</td>
               <td> <input type="text" id="xi" name="xi"  value="" ></td>
            </tr>
            <tr>
            <td>所在班级：</td>
               <td> <input type="text" id="ban" name="ban"  value="" ></td>
            </tr>
            <tr>
            <td>入学年份（届）：</td>
               <td>
               <select id="year" name="year">
                    <option>--请选择--</option>
                        
                        <option value="2018">2018</option>
                        <option value="2017">2019</option>
                        <option value="2016">2018</option>
                        <option value="2015">2019</option>
                        <option value="2014">2018</option>
                    </select>
               </td>
            </tr>
            <tr>
            <td>生源地：</td>
               <td>
               <select name="address">
               <option value ="河北省">河北省</option>
               <option value ="北京市">北京市</option>
               <option value ="天津市">天津市</option>
               <option value ="邱县">邱县</option>
               </select>
               </td>
            </tr>
            <tr>
            <td>备注：</td>
               <td> <input type="text" id="beizhu" name="beizhu"  value="" ></td>
            </tr>
            <tr>
                 <td> <button type="submit" >添&nbsp;&nbsp;&nbsp;&nbsp;加</button></td>
            </tr>
        </table>
</form>
</body>
</html>

数据库的连接与关闭：DB.java

package DateBase;

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 DB {
    public static String db_url = "jdbc:mysql://localhost:3306/web08?useSSL=false&serverTimezone=UTC&characterEncoding=UTF-8";//?serverTimezone=GMT%2B8

    public static String db_user = "root";
    public static String db_pass = "root";
    
    public static Connection getConn () {
        Connection conn = null;
        
        try {
            Class.forName("com.mysql.cj.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();
            }
        }
    }

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

}

执行sql语句：Dao.java

package Dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import DateBase.DB;
import Entity.FileUploadUtils;
import Entity.User;
import jdk.nashorn.internal.ir.RuntimeNode.Request;

public class Dao {
    public boolean add(String username,String password,String sex,String name,String xuehao,String mail,String xueyuan,String xi,String ban,String year,String address,String beizhu) {
        String sql = "insert into shangke  values ('" + username + "','" + password +"','" + sex +"','" +name +"','" + xuehao +"','" + mail +"','" +xueyuan +"','"+xi +"','"+ban +"','"+year+"','"+address +"','"+beizhu +"')";
        // 创建数据库链接
        Connection conn = DB.getConn();
        Statement state = null;
        boolean f = false;
        int a = 0;
        try {
            state = conn.createStatement();
            a = state.executeUpdate(sql);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 关闭z 连接
            DB.close(state, conn);
        }

        if (a > 0) {
            f = true;
        }
        return f;
    }
}

Selvlet：UserSelvlet.java

package Servlet;

import java.io.IOException;


import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import Entity.User;
import Dao.Dao;

/**
 * Servlet implementation class UserServlet
 */
@WebServlet("/UserServlet")
public class UserServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public UserServlet() {
        super();
        // TODO Auto-generated constructor stub
    }
    Dao dao = new Dao();
    
    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);
            //System.out.println("!!!");
        }
    }
    private void add(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException {
        // TODO Auto-generated method stub
        String username = req.getParameter("username");
        String password = req.getParameter("password");
        String sex = req.getParameter("sex");
        String name = req.getParameter("name");
        String xuehao = req.getParameter("xuehao");
        String mail = req.getParameter("mail");
        String xueyuan = req.getParameter("xueyuan");
        String xi = req.getParameter("xi");
        String ban = req.getParameter("ban");
        String year = req.getParameter("year");
        String address = req.getParameter("address");
        String beizhu = req.getParameter("beizhu");
        if(dao.add(username,password,sex,name,xuehao,mail,xueyuan,xi,ban,year,address,beizhu)) {
            req.setAttribute("message", "注册成功!");
            req.getRequestDispatcher("shangke.jsp").forward(req, resp);
        }else {
            req.setAttribute("message", "账号重复，请重新输入!");
            req.getRequestDispatcher("shangke.jsp").forward(req, resp);
        }
    }


}

四，运行测试

1，正确添加