In the jspdynpage how to implements file download!!!!

in the jspdynpage how to implements file download!!!!
in the portal's view i need to implements download file like *.xls,i don't know how to do. and if servlet can be used in the portal application!
Edited by: xuhuanjun on Apr 8, 2009 9:57 AM

Hi,
Check the below thread that will help you.
How to get a file download window using URL component in HTMLB/JSPDynpage
Raghu

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How to make file download in JSP ?

Friends,
i am using following code :
// LISTING FILES IN DIR
 out.println(" ");
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 if (children == null)
 // Either dir does not exist or is not a directory
 else
 %>
 <table border="1" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="68%" id="AutoNumber1">
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 for (int i=0; i<children.length; i++)
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%>
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<%=filename %></td>
<td width="50%">
<a href="<%= children[i %">">View</a></td>
</tr>
<%
out.println(" ");
%>
SInce i am not able to download file from link.
link shows path correct but why its not working ??
HELP ME.
*i don't want to show real path( physical location of file) on file donwload link.*
Example :
*it will not allow to show like following :*
*C:\project\webUpload\build\web\fuploads\file2.jpg*
*it may allow like :*
*\webUpload\fuploads\file2.jpg*
Thanks</a>

My friend you are getting it all wrong here...
Here we would be taking help of a dedicated servlet to locate and download a file(which would be the output the respective concent of depeding of the fineName or fileId you send in).
Please find some time and try to consider the below case...
Say i have a Servlet which takes a Request of detailed filePath and would give output as file itself....
and you prompt you give a link to that servlet from you JSP to download that file...
Checkout the below Code snippets to get some idea
DownloadPrompting.JSP:
==================
<a href="FileServlet?fileName=C:\fileuploaded\image1.jpg" title="C:\fileuploaded\image1.jpg">Click Here to download Image1 JPEG File</a>
<c:forEach var="fileName" items="${sessionScope.fileNames}">
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</c:forEach>
-------------------------------------------------------------------------FileServlet.java
===========
package com;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.URLConnection
public class FileServlet extends HttpServlet{
private void processAction(HttpServletRequest request,HttpServletResponse response) throws Exception{
 // getting fileName which user is requesting for
 String fileName = request.getParameter("fileName").replace('\\','/');
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 // Checking whether the file Exists or not
 if(exists){
 FileInputStream input = null;
 BufferedOutputStream output = null;
 int contentLength = 0;
 try{
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 String contentType = URLConnection.guessContentTypeFromName(fileName);
 if(contentType == null)
 contentType = "application/octet-stream";
 input = new FileInputStream(fileName);
 contentLength = input.available();
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 response.setContentType(contentType);
 // Specifes How much amountof data we straming & trying to download
 response.setContentLength(contentLength);
 // Adding Content Disposition header so that it cud enable us to get OPEN/SAVE after clicking on the link
 response.setHeader("Content-Disposition","attachment;filename="+fileName+"\");
 // Initializing File Streaming Response via a Servlet
 output = new BufferedOutputStream(response.getOutputStream());
 // Placing each byte on to the stream after reading it from the file
 while ( contentLength-- > 0 ) {
 output.write(input.read());
 // Flushing the stream.
 output.flush();
 }catch(IOException e) {
 System.err.println("Exception Occured:"+e.getMessage());
 System.err.println("Exception Localized Message:"+e.getLocalizedMessage());
 } finally {
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 try {
 input.close();
 } catch (IOException ie) {
 System.err.println("Exception Occured:"+e.getMessage());
 System.err.println("Exception Localized Message:"+e.getLocalizedMessage());
 // Closing the OUTPUT stream
 if (output != null) {
 try {
 output.close();
 } catch (IOException ie) {
 System.err.println("Exception Occured:"+e.getMessage());
 System.err.println("Exception Localized Message:"+e.getLocalizedMessage());
 }else{
 response.sendRedirect("/errorPage.html");
public void doPost(HttpServletRequest request,HttpServletResponse response) throws Exception{
 processAction(request,response);
public void doGet(HttpServletRequest request,HttpServletResponse response) throws Exception{
 processAction(request,response);
}And if you are thinking of hiding filepath & all...
Here is a hint for you...
Try to maintain a properties file which has a key value pairs of that something like.
112345678=C:\\uploadfile\\image1.jpg
122142637=C:\\uploadfile\\image2.jpg
or create a Database table which which an autogenerated primany key with some Id and holds the complete filePath.
and in this case you would access the file something like the one below from your jsp
<a href="FileServlet?fileId=112345678" title="112345678">Click Here to download Image1 JPEG File</a>
<c:forEach var="fileId" items="${sessionScope.fileNames}">
 <a href="FileServlet?fileId=<c:uri value="${fileId}"/>" title="<c:out value="${fileId}"/>">Click Here to download</a>
</c:forEach>
-------------------------------------------------------------------------and in the fileServlet you might have to change the below part to
// getting fileName which user is requesting for
 String fileName = request.getParameter("fileName").replace('\\','/');to something like
// getting fileName which user is requesting for
 String fileId = request.getParameter("fileId");
 /*Querying the database or reading the Properties file to findout the correspoding filePath associated with the fileId something like*/
 String fileName = ResourceDelegate.getInstance().getFile("fileId").replace('\\','/');
NOTE:* The idea is similar to what my fellow poster is trying to explain you in all his posts.
Hope that might help :)
REGARDS,
RaHuL

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��?�� Y�Dl?��>��hn��?g�x~��?7��}��h`a�F��?P?!P��*�X��?/?U ��A?|?/??$�T=��t ��?^!i��f��/?]?�c��7?�UZ�Gz?��SbU��p��Q�T��?��e JyN�/�X^��w��/Bo�k�O��^��$��?��yg��C(??[�[+?��R��p��?te@?��o��?M:D�_s#h��H��g/?�nE"�PQI��A!��bE��?C`A��?V��2�^��<�NK?[��k�k$??yJ>?sg-hm�AW(��S��?l[��[�� ?dL4��6!�N��*��N?Q2?��JoP��>|�sb�_�^�_��~�r��X
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