Данные после выбора select пересылает в сервлет ajax. Сервлет получает правильный запрос, обновляет содержимое переменной html, но вот на странице jsp значение атрибута остается прежним
@WebServlet( urlPatterns = {"/index.html", "/readServlet"})
public class ReadServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public ReadServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
List<Entity> entities = null;
String countStr = request.getParameter("count");
Count count = null;
int pageNumber = 0;
if(countStr!=null && !countStr.isEmpty()) {
System.out.println("count="+countStr);
count = Count.getValue(countStr);
}
if(count==null) {
count = Count.TEN;
}
try {
entities = Portal.getSystem().getNews(0, count);
pageNumber = Portal.getSystem().getCount() / count.getCount();
} catch (ClassNotFoundException | SQLException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
String html = "";
if(entities!=null) {
for (Entity e : entities) {
html += e.html();
}
}
request.setAttribute("html", html);
request.setAttribute("page", pageNumber);
request.getRequestDispatcher("index.jsp").forward(request, response);
}
@Override
protected void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException
{
processRequest(request, response);
}
@Override
protected void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException
{
doGet(request, response);
}
}
<%--
Created by IntelliJ IDEA.
User: dmitry
Date: 2019-07-26
Time: 01:35
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=utf-8" language="java" %>
<html>
<head>
<title>Title</title>
<meta charset = "UTF-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
</head>
<body>
<h1>This is index.jsp</h1>
<form action="loadServlet" method="post" enctype="multipart/form-data">
Заголовок: <input type="text" name="title" /><br/>
Текст новости: <input type="text" name="body">
<input type="file" name="file" />
Описание картинки: <input type="text" name="description">
<input type="submit" value="upload" />
</form>
<select id="select" name="count">
<option value ="10">10</option>
<option value ="20">20</option>
<option value ="50">50</option>
</select>
<div><%=request.getAttribute("page")%></div>
<div><%=request.getAttribute("html")%></div>
<%--<img src="<%=request.getAttribute("path")%>" />
<%=request.getAttribute("title")%>
<%=request.getAttribute("body") %>
<%=request.getAttribute("description") %>--%>
</body>
<script src="options.js"></script>
</html>
