file upload in jsp

**mudit222** · 04-18-2010, 09:10 PM

how to upload file through a jsp page to a server???

**flyfisherman** · 04-19-2010, 01:16 PM

You can use instructions from this link

AJAX File Upload Progress for Java - CodeGuru

or this

jGuru: How can I read parameters from a multipart/form-data upload form?

**mudit222** · 04-20-2010, 07:58 PM

i have put a question ......how to upload file through a jsp page to a server??? and i got best answer from your team ...........ans. was ajax file upload..........

now can u tell me the code to download that file from server to client in jsp???/

**flyfisherman** · 04-20-2010, 08:10 PM

Originally Posted by mudit222

now can u tell me the code to download that file from server to client in jsp???/

Well that depends from the upload location. If you upload files in public accessible locations, you will need a few lines of code to read dir content and generate links to every file...

For example here are the few lines I wrote for this purpose

FileUploadServlet

Java Code:

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		HttpSession session = request.getSession();
		
		Integer userId = (Integer) session.getAttribute("LoggedInUserId");
		ServletContext sc = getServletContext();
		String idString = request.getParameter("id");
		String upload_location = request.getParameter("upload_location");
		String product_path = null;
		if (upload_location.equals("products"))
			product_path = sc.getRealPath("products/"); // dir za slike
		else
			product_path = sc.getRealPath("computers/"); // dir za slike

		String url = "";
		
		if (userId == null || idString == null) {
			url = "/index.jsp";
		}
		else {
			int id = Integer.parseInt(idString);
			if (UserDB.isAdmin(userId) && (id > 0)) {
				session.setAttribute("productId", id);
				session.setAttribute("upload_location", upload_location);
				url = "/fileupload.jsp";
				}
			else {
				url = "/index.jsp";
			}
			session.setAttribute("productId", id);
			
			ArrayList<String> images = new ArrayList<String>();		
			
			File folder = new File(product_path + "/" + id + "/mid/");
		    File[] listOfFiles = folder.listFiles();

		    for (int i = 0; i < listOfFiles.length; i++) {
		      if (listOfFiles[i].isFile()) {
		    	images.add(listOfFiles[i].getName());
		        //System.out.println("File " + listOfFiles[i].getName());
		      } 
		    }
		    session.setAttribute("images", images);			
		}
				
		// forward ka JSP stranici
		RequestDispatcher dispatcher = getServletContext().getRequestDispatcher(url);
		dispatcher.forward(request, response);
	}

And here is the listing for fileupload.jsp file who will present images we collectet from servlets doGet

Java Code:

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>

<%@ 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>
<c:if test="${LoggedInUserGroup == 1}">
	<head>
	<script type="text/javascript" src="template/js/js.js"></script>
	<title>Upload slike</title>
	</head>
	<body>
<div align="center">	
<form id="myForm" enctype="multipart/form-data" method="post" action="FileUpload">
	<input type="hidden" name="dir" value="<c:out value="${productId}"/>" />
	<input type="hidden" name="upload_location" value="<c:out value="${upload_location}"/>" />
<table border="0" cellspacing="5" width="60%">
	<tr>
		<td align="right" width="60%">
		   	<input type="file" name="txtFile" id="txtFile" /> </td>
		<td align="left" width="40%"><input type="submit" id="submitID" name="submit" value="Upload" /></td>
	</tr>
		<c:forEach var="images" items="${images}">
			<tr>
			<td align="center">
				<c:if test="${(upload_location == 'products') || (upload_location == 'computers')}">
				<a href="<c:out value="${upload_location}"/>/<c:out value="${productId}"/>/<c:out value="${images}"/>" title="<c:out value="${product.name}"/>">
					<img src="<c:out value="${upload_location}"/>/<c:out value="${productId}"/>/mid/<c:out value="${images}"/>" border="0" />
				</a>
				</c:if>
			</td>
			<td align="left">
				<a href="javascript: if(confirm('Da li ste sigurni?')) idi_na('DeleteFile?fajl=<c:out value="${images}"/>')" title="Brisanje slike">
					<img src="template/images/delete.png" border="0" />
				</a></td>
			</tr>
			<tr>
			<td align="center"><a href="javascript:location.reload(true)">Refresh</a></td>
			<td></td>
			</tr>											
		</c:forEach> 
</table>
</form>
</div>
</body>
</c:if>      
</html>

Please notice that this code uses JSTL and has basic permission control.