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I've seen other questions similar to this asked but none of them have helped me solve my problem. Basically, I'm trying to pass a variable from a servlet to a JSP.
The servlet code.
package com.servlets;
import java.io.IOException;
import java.util.ArrayList;
import javax.servlet.annotation.WebServlet;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.dao.DataGetter;
@WebServlet("/DataGetterServlet")
public class DataGetterServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
ArrayList<String[]> data;
private DataGetter dg;
public void init() throws ServletException {
try {
dg = new DataGetter();
data = dg.getData();
} catch (Exception e) {
throw new ServletException("An exception occurred in DataGetterServlet: "
+ e.getClass().getName());
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setAttribute("data", data);
RequestDispatcher rd = request.getRequestDispatcher("index.jsp");
rd.forward(request, response);
}
}
My JSP code
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Data extractor</title>
</head>
<body>
Data table:
<table boder="1">
<c:forEach var="item" items="${data}" >
<tr>
<c:forEach var="column" items="${item}">
<td>${column}</td>
</c:forEach>
</tr>
</c:forEach>
</table>
</body>
</html>
I have done some tests with the forEach tag and JSTL is setup properly. I think the variable "data" is not reaching the JSP. Any idea why?
Thanks in advance.
EDIT: For clarification porpuses. I have tried
<c:forEach var="i" begin="1" end="5">
Item <c:out value="${i}"/><p>
</c:forEach>
And that works, but
<c:forEach var="item" items="${data}">
It worked!<p>
</c:forEach>
doesn't work. This is what has led me to believe that that variable data is not reaching the JSP for some reason.
EDIT 2: To run it, I configured a Tomcat server on Eclipse. I right click on the servlet and choose Run As -> Run on Server. The server restarts and I launch http://localhost:8080/DataExtractor/ from my browser. Here's the resulting html:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Data extractor</title>
</head>
<body>
Data table:
<table border="1">
</table>
</body>
</html>
EDIT 3: This might be the key of why this is happening. When I go to http://localhost:8080/DataExtractor/ (index.jsp), I get the html posted in Edit 2, but if I go to http://localhost:8080/DataExtractor/DataGetterServlet then I do get the right page! Any idea why?
610
This might be a typo, $(item) should be ${item} in the following -
<c:forEach var="column" items="$(item)" >
Update
http://localhost:8080/DataExtractor/ that doesn't map to the servlet, while http://localhost:8080/DataExtractor/DataGetterServlet does. If the servlet isn't invoked then it's obvious that data is not going to be the request. In other words, the first url is not invoking the servlet, but directly talking you to the page. (You probably have as welcome-page in web.xml)
125
In the jsp, you need to include this in the header:
<jsp:useBean id="data" class="java.util.ArrayList" scope="request"/>
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