第一个javaWeb项目-注册界面

基本功能：

　　实现信息录入到数据库和信息规范检查

题目要求：

项目目录：

网页界面：

程序源码：

package Dao;

import java.sql.Connection;
import java.sql.Statement;

import DB.DB;

public class Dao {
    public boolean add(String a,String b,String c,String d,String e,String f,String g,String h,String i,String j,String k,String l) {

        String sql = "insert into u(username,userpass,sex,name,xueid,email,xueyuan,xi,banji,nian,place,comment) values('" + a + "','" + b + "','" +c + "','" + d + "','" + e + "','" +f + "','" + g + "','" + h + "','" + i + "','" +g + "','" + k + "','" + l + "')";
        Connection conn = DB.getConn();
        Statement state = null;
        int h1=0;
        boolean p = false;
        try {
            state = conn.createStatement();
            h1 = state.executeUpdate(sql);
        } catch (Exception q) {
            q.printStackTrace();
        } finally {
            DB.close(state, conn);
        }
        if(h1>0) {
            p = true;
        }
        return p;
    }
}

Dao.java

package DB;

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

public class DB {
    public static String db_url = "jdbc:mysql://localhost:3306/runoob?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8&useSSL=false";
    public static String db_user = "root";
    public static String db_pass = "scfroot5201314@";
    public static Connection getConn () {
        Connection conn = null;

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

        return 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();
        }
    }
}

}

DB.java

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.Dao;

/**
 * Servlet implementation class Servlet
 */
@WebServlet("/Servlet")
public class Servlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    Dao dao = new Dao();

    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("utf-8");
        add(req, resp);
    }

    private void add(HttpServletRequest req, HttpServletResponse resp) {
        String a = req.getParameter("username");
        String b = req.getParameter("userpass");
        String c = req.getParameter("sex");
        String d = req.getParameter("name");

        String e = "2018"+req.getParameter("xueid");
        String f = req.getParameter("email");
        String g = req.getParameter("xueyuan");
        String h = req.getParameter("xi");

        String i = req.getParameter("banji");
        String j = req.getParameter("nian");
        String k = req.getParameter("place");
        String l = req.getParameter("comment");
        boolean p = dao.add(a, b, c, d, e, f, g, h,i,j,k,l);
        try {
            if (p) {
                req.setAttribute("message", "添加成功！");
                req.getRequestDispatcher("text.jsp").forward(req, resp);
            } else {
                req.setAttribute("message", "添加失败！");
                req.getRequestDispatcher("text.jsp").forward(req, resp);
            }
        } catch (ServletException | IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }

    }
}

Servlet.java

<%@page contentType="text/html;charset=UTF-8"%>
<script language="JavaScript">
    function check() {
        //得到用户输入的信息

        var username = document.form.username.value;
        var userpass = document.form.userpass.value;
        var  sex = document.form.sex.value;
        var  name = document.form.name.value;
        var  xueid= document.form.xueid.value;
        var  xueyuan =document. form.xueyuan.value;
        var xi = document.form.xi.value;
        var  email =document. form.email.value;
        var  banji = document.form.banji.value;
        var  nian =document. form.nian.value;
        var  place = document.form.place.value;
        var  comment = document.form.comment.value;

        //判断用户名长度
        if (!minLength(username, 6)) {
            alert("用户名长度小于6位！");
            form.username.focus();
            return false;
        }
        if (!maxLength(username, 12)) {
            alert("用户名长度大于12位！");
            form.username.focus();
            return false;
        }
        if(!isDigital(username)){
            alert("用户名只有字母可以开头");
            form.username.focus();
            return false;
        }

        //判断口令长度
        if (!minLength(userpass, 8)) {
            alert("密码长度小于8位！");
            form.userpass.focus();
            return false;
        }
        if (!minLength(xueid, 4)) {
            alert("学号长度小于8位！");
            form.xueid.focus();
            return false;
        }
        if (!isNumber(xueid)) {
            alert("学号必须是数字");
            form.xueid.focus();
            return false;
        }

        //验证E-mail的格式是否正确
        if (!isEmail(email)) {
            alert("E-mail格式不正确！");
            form.email.focus();
            return false;
        }

        document.form.submit();
    }

    //验证是否满足最小长度
    function minLength(str, length) {
        if (str.length >= length)
            return true;
        else
            return false;
    }
    //判断是否满足最大长度
    function maxLength(str, length) {
        if (str.length <= length)
            return true;
        else
            return false;
    }
    //判断首字母
    function isDigital(str) {

            if (str.charAt(0) >= 'a' && str.charAt(0) <= 'z'||(str.charAt(0) >= 'A' && str.charAt(0) <= 'Z'))
                return true;
            else
                return false;

    }

    //判断是否是整数
    function isNumber(str)
    {
    for(i=0;i<str.length;i++)
    {
    //每一位都是0～9的数字，如果是第1位，则可以是“-”号
    if(str.charAt(i)>='0'&&str.charAt(i)<='9'
    ||str.charAt(i)=='-'&&i==0)
    continue;
    else
    return false;
    }
    return true;
    }

    //判断是否是E-mail
    function isEmail(email) {
        if (email.length == 0)
            return false;
        index1 = email.indexOf('@');
        index2 = email.indexOf('.');
        if (index1 < 1//@符号不存在，或者在第一个位置
                || index2 < 1//.符号不存在，或者在第一个位置
                || index2 - index1 < 2//.在@的左边或者相邻
                || index2 + 1 == email.length)//.符号后面没有东西
            return false
        else
            return true;
    }
</script>
<html>
<head>
<title>添加学生信息</title>
</head>
<body>
<%
         Object message = request.getAttribute("message");
         if(message!=null && !"".equals(message)){
    %>
         <script type="text/javascript">
              alert("<%=request.getAttribute("message")%>");
         </script>
    <%} %>
    <form name="form" action="Servlet" method="post">

        <table align="center">

            <tr>
                <td>登录账号：</td>
                <td><input type="text" name="username"></td>
            </tr>
            <tr>
                <td>登陆密码：</td>
                <td><input type="password" name="userpass"></td>
            </tr>

            <tr>
                <td>性别：</td>
                <td><select name="sex">

                        <option value="男" selected>男</option>
                        <option value="女 " >女</option>

                </select></td>
            </tr>
            <tr>
                <td>姓名:</td>
                <td><input type="text" name="name"></td>
            </tr>
            <tr>
                <td>学号：</td>
                <td>2018<input type="text"  name="xueid" maxlength="4"></td>
            </tr>
            <tr>
                <td>电子邮件：</td>
                <td><input type="text" name="email">
                    </td>
            </tr>
            <tr>
                <td>所在学院：</td>
                <td><input type="text" name="xueyuan"></td>
            </tr>
            <tr>
                <td>所在系：</td>
                <td><input type="text" name="xi"></td>
            </tr>
            <tr>
                <td>所在班级：</td>
                <td><input type="text" name="banji"></td>
            </tr>
            <tr>
                <td>入学年份（届）：</td>
                <td><select name="nian">

                        <option value="2017">2017</option>
                        <option value="2018 " selected>2018</option>
                        <option value="2019 ">2019</option>

                </select></td>
            </tr>
            <tr>
                <td>生源地：</td>
                <td><input type="text" name="place"></td>
            </tr>
            <tr>
                <td>备注：</td>
                <td><textarea rows="8" name="comment" cols="40"></textarea></td>
            </tr>
            <tr>

                <td><input type="button" value="提交" onclick="check()"></td>
            </tr>
</table>
</form>
</body>
</html>

text.jsp