这不会产生任何错误，但是我的数据不会发送到数据库。 JSP和servlet页面都可以正常工作，但是我找不到连接问题。我已经使用相同的方法创建了以前的项目，并且它们运行良好。
catering.jsp
<div class="cat_book_wrapper" data-stellar-background-ratio="0.3">
<div class="container">
<div class="row">
<div class="col-lg-6 col-md-8 col-lg-offset-3 col-md-offset-2 col-sm-offset-0 col-xs-offset-0 padding-right padding-left">
<div class="cat_book_form wow zoom">
<form method="POST" action="Catering">
<table>
<tr>
<td>Date</td>
<td><input type="date" class="form-control datepicker" placeholder="dd/mm/yyyy" id="cus_date" /></td>
</tr>
<tr>
<td>No.Of People</td>
<td>
<select class="form-control selectpicker" id="cus_ppl">
<option value="1">Select from list</option>
<option value="2">30</option>
<option value="3">40</option>
<option value="4">50</option>
<option value="5">100</option>
<option value="6">150</option>
<option value="7">200</option>
</select>
</td>
</tr>
<tr>
<td>Venue</td>
<td><input type="text" class="form-control" placeholder="No.45, Kadawatha, Wattala" id="venue" /></td>
</tr>
<tr>
<td>Contact Person</td>
<td><input type="text" class="form-control" placeholder="A.M De Alwis" id="cus_name" /></td>
</tr>
<tr>
<td>Phone Number</td>
<td><input type="text" class="form-control" placeholder="0777456345" id="cus_num" /></td>
</tr>
<tr>
<td>Email Id</td>
<td><input type="email" class="form-control" placeholder="Info@yourdomain.com" id="cus_email" /></td>
</tr>
<tr>
<td><input type="submit" value="book now" class="btn search_toggle" /></td>
</tr>
</table>
</form>
</div>
</div>
</div>
</div>
</div>
Catering.java（Servlet）
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
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 Catering
*/
@WebServlet("/Catering")
public class Catering extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public Catering() {
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 {
try {
String cus_date = request.getParameter("cus_date");
String cus_ppl = request.getParameter("cus_ppl");
String venue = request.getParameter("venue");
String cus_name = request.getParameter("cus_name");
String cus_num = request.getParameter("cus_num");
String cus_email = request.getParameter("cus_email");
String sql = "insert into cater(cus_date,cus_ppl,venue,cus_name,cus_num,cus_email) values(?,?,?,?,?,?)";
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/sujanee", "root", "");
java.sql.PreparedStatement ps = conn.prepareStatement(sql);
ps.setString(1, cus_date);
ps.setString(2, cus_ppl);
ps.setString(3, venue);
ps.setString(4, cus_name);
ps.setString(5, cus_num);
ps.setString(6, cus_email);
ps.executeUpdate();
response.sendRedirect("cateringDisplay.jsp");
return;
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
答案 0 :(得分：0)
首先，在doPost方法上设置一个断点，并检查是否可以获取请求参数。
似乎您在表单中缺少属性name。这代表HTTP请求参数名称。
尝试一下：
<div class="cat_book_wrapper" data-stellar-background-ratio="0.3">
<div class="container">
<div class="row">
<div
class="col-lg-6 col-md-8 col-lg-offset-3 col-md-offset-2 col-sm-offset-0 col-xs-offset-0 padding-right padding-left">
<div class="cat_book_form wow zoom">
<form method="POST" action="Catering">
<table>
<tr>
<td>Date</td>
<td><input type="date" class="form-control datepicker"
placeholder="dd/mm/yyyy" id="cus_date" name="cus_date" /></td>
</tr>
<tr>
<td>No.Of People</td>
<td><select class="form-control selectpicker" id="cus_ppl" name="cus_ppl">
<option value="1">Select from list</option>
<option value="2">30</option>
<option value="3">40</option>
<option value="4">50</option>
<option value="5">100</option>
<option value="6">150</option>
<option value="7">200</option>
</select></td>
</tr>
<tr>
<td>Venue</td>
<td><input type="text" class="form-control"
placeholder="No.45, Kadawatha, Wattala" id="venue" name="venue" /></td>
</tr>
<tr>
<td>Contact Person</td>
<td><input type="text" class="form-control"
placeholder="A.M De Alwis" id="cus_name" name="cus_name" /></td>
</tr>
<tr>
<td>Phone Number</td>
<td><input type="text" class="form-control"
placeholder="0777456345" id="cus_num" name="cus_num" /></td>
</tr>
<tr>
<td>Email Id</td>
<td><input type="email" class="form-control"
placeholder="Info@yourdomain.com" id="cus_email" name="cus_email" /></td>
</tr>
<tr>
<td><input type="submit" value="book now"
class="btn search_toggle" /></td>
</tr>
</table>
</form>
</div>
</div>
</div>
</div>
</div>