【发布时间】：2019-03-29 23:18:14
【问题描述】：
我有下面的 html 表单，用户可以在其中预订房间。我正在尝试获取用户在 jsp 代码中输入的数据，如图所示，但数据库中的所有值都添加为 null，但“user_email”字段除外，该字段被视为从 servlet 调度的属性。我的代码有问题吗？如果是这样，我怎样才能从这个表单的输入字段中获取值并将它们提交到下面的jsp代码。
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" import = "com.user.*"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Reservation</title>
</head>
<body>
<form action="#">
<center>
<h3>Reservation</h3>
</center>
<table align="center" border="1">
<tr>
<td colspan="4" align="center">Please complete your reservation</td>
</tr>
<tr>
<td>Arrival Date</td>
<td><select name="day" required>
<option value="">--Day--</option>
<option value="01">1</option>
<option value="02">2</option>
<option value="03">3</option>
<option value="04">4</option>
<option value="05">5</option>
<option value="06">6</option>
<option value="07">7</option>
<option value="08">8</option>
<option value="09">9</option>
<option value="10">10</option>
<option value="11">11</option>
<option value="12">12</option>
<option value="13">13</option>
<option value="14">14</option>
<option value="15">15</option>
<option value="16">16</option>
<option value="17">17</option>
<option value="18">18</option>
<option value="19">19</option>
<option value="20">20</option>
<option value="21">21</option>
<option value="22">22</option>
<option value="23">23</option>
<option value="24">24</option>
<option value="25">25</option>
<option value="26">26</option>
<option value="27">27</option>
<option value="28">28</option>
<option value="29">29</option>
<option value="30">30</option>
<option value="31">31</option>
</select>
<select name="month" required>
<option value="">--Month--</option>
<option value="01">Jan</option>
<option value="02">Feb</option>
<option value="03">Mar</option>
<option value="04">Apr</option>
<option value="05">May</option>
<option value="06">Jun</option>
<option value="07">Jul</option>
<option value="08">Aug</option>
<option value="09">Sep</option>
<option value="10">Oct</option>
<option value="11">Nov</option>
<option value="12">Dec</option>
</select>
<select name="year" required>
<option value="">--Year--</option>
<option value="2018">2018</option>
<option value="2019">2019</option>
<option value="2020">2020</option>
<option value="2021">2021</option>
</select></td>
</tr>
<tr>
<td>Number of rooms</td>
<td colspan="2"><input type="text" name="roomNo" id="roomNos" required>
</td>
</tr>
<tr>
<td>Number of nights</td>
<td colspan="2"><input type="text" name="nights" id="nightsNos" required>
</td>
</tr>
<tr>
<td>Room type:</td>
<td><select name="rType" required>
<option value="Single"> Single</option>
<option value="Double"> Double</option>
<option value="Triple"> Triple</option>
<option value="Suite"> Suite</option>
</select></td>
</tr>
</table><br>
<center><input type="submit" value="Add reservation" name="button" ></center>
</form>
<%
String d = request.getParameter("day");
String m = request.getParameter("month");
String y = request.getParameter("year");
String r = request.getParameter("roomNo");
String n = request.getParameter("nights");
String rt = request.getParameter("rType");
String em = String.valueOf(request.getAttribute("email"));
ReservationDb rd = new ReservationDb();
rd.insert(d, m, y, r, n, rt, em);
%>
</body>
</html>
//插入函数
public void insert(String d, String m, String y, String r, String n, String rt, String em) {
Connection connection = null;
PreparedStatement ppStm = null;
try {
connection = ConnectionConfiguration.getConnection();
ppStm = connection.prepareStatement("INSERT INTO reservations (res_day,res_month,res_year,no_rooms,"
+ "no_nights,room_type,user_email)"
+ "VALUES (?,?,?,?,?,?,?)");
int count = 1;
ppStm.setString(count++, d);
ppStm.setString(count++, m);
ppStm.setString(count++, y);
ppStm.setString(count++, r);
ppStm.setString(count++, n);
ppStm.setString(count++, rt);
ppStm.setString(count++, em);
ppStm.executeUpdate();
} catch(Exception e) {
e.printStackTrace();
} finally {
if (ppStm != null){
try {
ppStm.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (connection != null) {
try {
connection.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
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标签： java html mysql jsp form-submit