javaweb简单的学生信息录入系统

时间：2019-10-21 20:55:07 阅读：162 评论：0 收藏：0 [点我收藏+]

标签：http tac height fun dispatch except 学生 oca 效果

讲一下思路，主界面的设计就是用html表单元素，百度查找各个元素的用法，按照自己的想法摆放即可，表单提交后会把数据交给serverlet去处理，在那里定义几个字符串变量来储存获取到的数据，然后按照项目要求对数据格式进行判断（如学号长度是否为8位），对有错误的格式进行相应报错，若数据无误则提交数据库并跳转至success页面。格式判断应该是这里面对算法要求最多的，但也很简单，长度判断直接调用String类型的length()方法返回长度即可，而邮箱格式或“首字符必须为字母”这样的判断最好用正则表达式来写，如果不会写的话直接百度现成的方法就好。

下面是代码：

主界面

index.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>

</head>
<body>
    <%
         Object message = request.getAttribute("message");
         if(message!=null && !"".equals(message)){
     
    %>
         <script type="text/javascript">
              alert("<%=request.getAttribute("message")%>");
         </script>
    <%} %>
<form action="AdminServlet" method="post" name="form1" id="form1">
    <div id="container">
        <div class="header">
            <p>学生注册</p>
        </div>
        <div class="form-body">
                
                    <label for="">登录账号：</label>
                   <input type="text" class="form-input" name="user" value="" placeholder="6-12位">
               
                <div class="form-group">
                    <label for="">登录密码：&nbsp;</label>
                    <input type="password" class="form-input" value="" name="password" >
                </div>
                
                
                 <div class="form-group">
                    <label for="">性&nbsp;&nbsp;&nbsp;别：</label>
                   <select name="sex">
                        <option value="男">男</option>
                        <option value="女">女</option>
                    </select>
                </div>
                
                <div class="form-group">
                    <label for="">姓&nbsp;&nbsp;&nbsp;名：&nbsp;</label>
                    <input type="text" class="form-input" name="name" size="20" maxlength="15" value="" placeholder="请在这里输入用户名">
                </div>
               
                
                                
                                
                                <div class="form-group">
                    <label for="">学&nbsp;&nbsp;&nbsp;号：&nbsp;</label>
                    <input type="text" class="form-input" name="num" value="" placeholder="8位">
                </div>
                                
                                <div class="form-group">
                    <label for="">电子邮箱：&nbsp;</label>
                    <input type="text" class="form-input" value="" name="email">
                </div>
                 <div class="form-group">
                    <label for="">所在学院：&nbsp;</label>
                    <input type="text" class="form-input" value="" name="yuan">
                </div>
                 <div class="form-group">
                    <label for="">所在系：&nbsp;&nbsp;&nbsp;</label>
                    <input type="text" class="form-input" value="" name="xi">
                </div>
                
                 <div class="form-group">
                    <label for="">所在班级：&nbsp;</label>
                    <input type="text" class="form-input" value="" name="clas">
                </div>
                  <div class="form-group">
                    <label for="">入学年份（届）：</label>
                    <select name="year">
                        <option value="1998">1998</option>
                        <option value="1999">1999</option>
                        <option value="2000">2000</option>
                        <option value="2001">2001</option>
                        <option value="2002">2002</option>
                        <option value="2003">2003</option>
                        <option value="2004">2004</option>
                        <option value="2005">2005</option>
                        <option value="2006">2006</option>
                        <option value="2007">2007</option>
                        <option value="2008">2008</option>
                        <option value="2009">2009</option>
                        <option value="2010">2010</option>
                        <option value="2011">2011</option>
                        <option value="2012">2012</option>
                        <option value="2013">2013</option>
                        <option value="2014">2014</option>
                        <option value="2015">2015</option>
                        <option value="2016">2016</option>
                        <option value="2017">2017</option>
                        <option value="2018">2018</option>
                        <option value="2019">2019</option>
                    </select>届
                </div>
                <div class="form-group">
                    <label for="">生源地：&nbsp;</label>
                    <input type="text" class="form-input" value="" name="address">
                </div>
                
                备注：<div class="form-group">
              
                    <textarea rows="10" name="bei" cols="30">无</textarea> 
                </div>
            <div class="btn">
                <input type="submit" value="添加" class="form-btn form-btn-primary">
                <input type="reset" value="重置" class="form-btn form-btn-primary">
            </div>
        </div>
        <div class="footer">
        </div>
    </div>
</form>
</body>
<script>
    obj = document.getElementById(‘container‘);
    cWidth = window.innerWidth;
    cHeight = window.innerHeight;
    obj.style.marginLeft = (cWidth - 380)/2+"px";
    obj.style.marginTop = (cHeight - 300)/2+"px";
    window.onresize=function(){
        cWidth = window.innerWidth;
        cHeight = window.innerHeight;
        obj.style.marginLeft = (cWidth - 380)/2+"px";
        obj.style.marginTop = (cHeight - 300)/2+"px";
    }
</script>
</html>

录入成功后界面

success.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>
</head>
<body>
    <%
         Object message = request.getAttribute("message");
         if(message!=null && !"".equals(message)){
     
    %>
         <script type="text/javascript">
              alert("<%=request.getAttribute("message")%>");
         </script>
    <%} %>
<h1>欢迎使用本系统</h1>
</body>
</html>

后台

serverlet

package a;

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;

/**
 * Servlet implementation class a
 */
@WebServlet("/a")
public class a extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public a() {
        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
        response.getWriter().append("Served at: ").append(request.getContextPath());
    }

    /**
     * @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);
    }

}

package a;

import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

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.UserDao;



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

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        String user = request.getParameter("user");
        String password=request.getParameter("password");
        String name=request.getParameter("name");
        String sex=request.getParameter("sex");
        String address=request.getParameter("address");
        String num=request.getParameter("num");
        String email=request.getParameter("email");
        String xi=request.getParameter("xi");
        String yuan=request.getParameter("yuan");
        String clas=request.getParameter("clas");
        String bei=request.getParameter("bei");
        String year=request.getParameter("year");
        int x=0;
        int a=0;
        if(user.equals("")) {
            request.setAttribute("message", "账号不能为空！");
            request.getRequestDispatcher("index.jsp").forward(request,response);
        }
        if(!num.equals("")) {
         a=num.length();
        String ye=num.substring(0, 4);
        
        
        if(!ye.equals("2018"))x=4;}
        
        int ps=password.length();
        if(ps<8)x=2;
        
        int l=user.length();    
        if(l<6||l>12)x=3;
        String s=user;
        Pattern pa = Pattern.compile("[a-zA-Z].*");
           Matcher isNum = pa.matcher(s.charAt(0)+"");
           if (!isNum.matches()) {
               x=1;
               pa = Pattern.compile(" ^[0-9a-zA-Z_]{1,}$");
           }
          
        
        
        String reg = "\\w+@(\\w+\\.){1,3}\\w+";
        Pattern pattern = Pattern.compile(reg);
        boolean flag = false;
        if (email != null) {
            Matcher matcher = pattern.matcher(email);
            flag = matcher.matches();
        }
        
        boolean n = false;
        if(x==0)
        {
        if(a==8)
        {
            if(flag==true)
            {
                try {
                    /*request.setAttribute("message", username+ userpassword+ name+sex+address+ phone+ email);*/
                    
                    n=UserDao.addPerson(user, password, name, sex, address, num, email, clas, xi, bei, yuan, year);
                    
                } catch (Exception e) {;
                    // TODO 自动生成的 catch 块
                    e.printStackTrace();
                }
                if(n!=true)
                {
                    request.setAttribute("message", "注册成功!!");
                    request.getRequestDispatcher("success.jsp").forward(request,response);
                }else {
                    request.setAttribute("message", "注册失败");
                    request.getRequestDispatcher("index.jsp").forward(request,response);
                }
            }
            else
            {
                request.setAttribute("message", "邮箱格式错误");
                request.getRequestDispatcher("index.jsp").forward(request,response);
            }
        }
        else
        {
            request.setAttribute("message", "学号不为8位");
            request.getRequestDispatcher("index.jsp").forward(request,response);
        }}
        else {
            if(x==1) {
                request.setAttribute("message", "账号开头必须为字母");
                request.getRequestDispatcher("index.jsp").forward(request,response);
            }
if(x==2) {
    request.setAttribute("message", "密码长度应在8位以上");
    request.getRequestDispatcher("index.jsp").forward(request,response);
            }
if(x==3) {
    request.setAttribute("message", "账号长度应为6到12");
    request.getRequestDispatcher("index.jsp").forward(request,response);
}
if(x==4) {
    request.setAttribute("message", "学号开头应为2018");
    request.getRequestDispatcher("index.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);
    }

}

数据库的连接DBUL类

package DBU;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class DBUtil {
    //这里可以设置数据库名称
    private final static String URL = "jdbc:sqlserver://localhost:1433;DatabaseName=777";
    private static final String USER="sa";
    private static final String PASSWORD="1999";
    
    private static Connection conn=null;
    //静态代码块（将加载驱动、连接数据库放入静态块中）
    static{
        try {
            //1.加载驱动程序
            Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
            //2.获得数据库的连接
            conn=(Connection)DriverManager.getConnection(URL,USER,PASSWORD);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
    
    //对外提供一个方法来获取数据库连接
    public static Connection getConnection(){
        return conn;
    }
}

Dao

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 DBU.DBUtil;



public class UserDao {


    public static boolean addPerson(String user,String password,String name,String sex,String address,String num,String email,String clas ,String xi,String bei,String yuan,String year)throws SQLException{
        //首先拿到数据库的连接
        Connection conn=DBUtil.getConnection();
        String sql= "insert into Table_7 values(?,?,?,?,?,?,?,?,?,?,?,?)";//参数用?表示，相当于占位符;
        
        //预编译sql语句
        PreparedStatement pst = conn.prepareStatement(sql,Statement.RETURN_GENERATED_KEYS); 
        
        //先对应SQL语句，给SQL语句传递参数
        pst.setString(1, user);
        pst.setString(2, password);
        pst.setString(3, sex);
        pst.setString(4, name);
        pst.setString(5, num);
        pst.setString(6, email);
        pst.setString(7,yuan);
        pst.setString(8, xi);
        pst.setString(9, clas);
        pst.setString(10, year);
        pst.setString(11,address);
        pst.setString(12, bei);
        //执行SQL语句
        boolean a=pst.execute();
        /**
         * prepareStatement这个方法会将SQL语句加载到驱动程序conn集成程序中，但是并不直接执行
         * 而是当它调用execute()方法的时候才真正执行；
         * 
         * 上面SQL中的参数用?表示，相当于占位符，然后在对参数进行赋值。
         * 当真正执行时，这些参数会加载在SQL语句中，把SQL语句拼接完整才去执行。
         * 这样就会减少对数据库的操作
         */
        return a;