开头是我的jsp页面代码:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="java.sql.*"%>
<%@ page import="java.io.*"%>
<%@ page import="java.util.*" %>
<%@ page import="test.Obiekt" %>
<%@ page import="test.ListaObiektow" %>
<%@ page import="test.Termin" %>
<%@ page import="test.ListaTerminow" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>menu główne</title>
<meta name="viewport" content="initial-scale=1, maximum-scale=1">
<meta name="android-mobile-web-app-capable" content="yes">
<meta name="android-mobile-web-app-status-bar-style" content="black">
<link href="css/ratchet.css" rel="stylesheet">
<link href="css/ratchet-theme-android.css" rel="stylesheet">
<script src="js/ratchet.js"></script>
</head>
<body>
<!-- <header class="bar bar-nav">
<a class="icon icon-left-nav pull-left" href="wyszukaj.html"></a>
<h1 class="title">Wybierz obiekt</h1>
</header> -->
<div id="content">
<%
List<Obiekt> list = new ListaObiektow().getObiekty();
%>
<select name="obiekt">
<option selected value="default">Wybierz Obiekt</option>
<%
for (Obiekt obiekt : list) {
%>
<option value="<%=obiekt.idObiekt %>"><%=obiekt.nazwa%> <%=obiekt.adres %></option>
<%
}
%>
<%
%>
</select>
<br><br>
<form name="rezerwuj">
<font color="white">Liczba uczestników</font><input type="text" name="uczest"/>
<%
int liczbaUczestnikow = Integer.parseInt(request.getParameter("uczest"));
%>
</form>
<br>
<br>
<%List<Termin> lista = new ListaTerminow().getTerminy(); %>
<div id="terminy">
<table>
<%for (Termin termin : lista) {%>
<tr>
<td><%=termin.idTermin %></td>
<td><%=termin.nazwaObiektu %> <%=termin.adresObiektu %> </td>
<td><%=termin.dzien %> </td>
<td><%=termin.odKtorej %> </td>
<td><%=termin.doKtorej %> </td>
<td><form action="Zarezerwuj" method="post"><input type="submit" value="Rezerwuj"></form></td>
</tr>
<% } %>
</table>
</div>
<br><br><br>
</div>
</body>
</html>
我想从 <input type="text" name="uczest"/> 中获取值并记住她的提交按钮，该按钮调用放置在此类中的 mysql 查询:
package test;
import java.io.IOException;
import test.Rezerwacja;
import java.sql.*;
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 test.ConnectionClass;;
/**
* Servlet implementation class Zarezerwuj
*/
@WebServlet("/Zarezerwuj")
public class Zarezerwuj extends HttpServlet {
private static final long serialVersionUID = 1L;
Connection conn;
public Zarezerwuj() {
super();
conn = ConnectionClass.Polacz();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
int liczbaUczestnikow = Integer.parseInt(request.getParameter("liczbaUczestnikow"));
int idTermin = Integer.parseInt(request.getParameter("idTermin"));
Statement st = null;
String sql = "INSERT INTO rezerwacje (liczbaUczestnikow,idTermin) values ('" + liczbaUczestnikow + "','" + idTermin + "')";
try
{
st = conn.createStatement();
}
catch(SQLException e)
{
System.out.println(e);
}
}
}
我还想通过<td><%=termin.idTermin %></td> termin.idTermin 到 Zarezerwuj servlet。
我已经通过服务器调用 Jesper Null Exception 尝试了 request.getParameter。我不知道现在该怎么办。
最佳答案
这不是怎么 Request#getParameter(nameOfParameter) 作品:
您首先需要创建一个具有name 属性的输入字段作为idTermin
像这样:
<input type="text" name="idTermin" value="<%=termin.idTermin %>"/>
现在在你的 Servlet 中，如果你调用
request.getParameter("idTermin");
你会得到想要的值。
如果您不需要输入字段，您也可以在您的 jsp 中创建隐藏字段:
<input type="hidden" name="idTermin" value="<%=termin.idTermin %>"/>
关于java - 如何将输入文本的值传递给jsp变量？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30711304/