• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 242
  • Last Modified:

Can I download .txt, .html, jpg, gif

I have made a servlet which can downloads files from server, but when I tried to download .txt, .html, .jpg, or .gif files, browser open that files not download (even I set the Content Type("application/octet-stream")). I want to save these files on the disk not open it in the browser. Can anyone help me in this regards, I will be very thankful......
0
siayubi
Asked:
siayubi
  • 6
  • 6
1 Solution
 
jerchCommented:
Hi siayubi...
I'm not sure if this is what you need. Check it out.  This utility triggers a download dialog box in the browser.  

import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class ServletUtils {
    public static void returnFileForDownload(HttpServletResponse res,
            String fileName) throws IOException {
         
        if ((fileName == null) || (res == null)) {
            throw new IllegalArgumentException();
        }
             
        byte[] buf = new byte[4 * 1024];
        File file = new File(fileName);
        res.setHeader("Content-Disposition", "attachment; filename=" + file.getName() + ";");
        res.setContentType("application/octet-stream");
        res.setHeader("Cache-Control", "no-cache");
     
        FileInputStream inStream = new FileInputStream(file);
        OutputStream outStream = res.getOutputStream();

        int sizeRead = 0;
        while ((sizeRead = inStream.read(buf, 0, buf.length)) != -1) {
            outStream.write(buf, 0, sizeRead);
        }
         
        inStream.close();
        outStream.close();
    }
}

You can use this in your servlet like this.

ServletUtils.returnFileForDownload(res, "c:\\yourfile.jpg");

best regards...
Jerson
0
 
siayubiAuthor Commented:
Dear Jerson

Even your code opens the files (of extention .txt, .jpg, .gif and .html) in the browser. It cannot download that files. My problem is to download these files on the disk .........
0
 
jerchCommented:
I've tested the code. Isn't a download dialog box shown?

cheers...
Jerson
0
Cloud Class® Course: Microsoft Exchange Server

The MCTS: Microsoft Exchange Server 2010 certification validates your skills in supporting the maintenance and administration of the Exchange servers in an enterprise environment. Learn everything you need to know with this course.

 
siayubiAuthor Commented:
I am working in IE4 browser it show the files of having above extention. and in NS 4.72 it will download a garbeg but in IE5 it work fine.

What's your point of view.

 
0
 
jerchCommented:
Hi siayubi...
I think the reason is that because Content-Disposition header is not a standard HTTP header so it's not supported by the browsers you mentioned.  It's actually a de facto standard, which means it's widely used but not defined in HTTP spec.  But as far as my concern, the content-diposition is working with IE 4 fine.  Try to remove res.setHeader("Cache-Control", "no-cache"); since it's a http 1.1 specific header maybe it will help. You can use pragma instead.

cheers...
Jerson
     
       
0
 
yoavdoCommented:
another option is to remove the key of txt etc. from your registry :

  [Version]
     signature="$CHICAGO$"
 
      [DefaultInstall]
      DelReg = RegChange
 
      [RunIt]
     DelReg= RegChange
 
      [RegChange]
     HKCR,MIME\Database\Content Type\text/plain,Extension
     
u can copy this into a .inf file, then install it, (right click). this small file remove the keys of the txt extention. after u insatll such a file, your browser (btw, u should change it to ie5) will not open any more txt files!
0
 
jerchCommented:
Hi siayubi...
Is it working?

Jerson
0
 
siayubiAuthor Commented:
Hi Dear Jerson

It is not working with IE4 or NS4.72, by my experience "content-diposition" is not working with IE4. I have tried to do this with the removal of res.setHeader("Cache-Control", "no-cache") and also with res.setHeader("pragma", "no-cache") but all in vain. Can you help me  anywhere else.....
0
 
jerchCommented:
Hi siayubi...
Check this site http://www.javaworld.com/javaworld/javatips/jw-javatip94.html.  I just found this site last week.  It says that there's a bug in IE 4 which doesn't recognize the content-disposition header.  Actually, it's working with my IE4.

cheers...
Jerson
0
 
siayubiAuthor Commented:
Dear yoavdo!

It is not my requirment that user(client) should do some thing for download. Mr. Jerson solution is right.

I am very thankful to you.
0
 
siayubiAuthor Commented:
can you guys give me your emails
my email is siayubi@hotmail.com
0
 
siayubiAuthor Commented:
Thanks Jerson!
Can you provide me your email.
my is siayubi@hotmail.com
0
 
jerchCommented:
jerson@rocketmail.com
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

  • 6
  • 6
Tackle projects and never again get stuck behind a technical roadblock.
Join Now