File Transfer b/w Client - Server using JSP

Hi,
I need to implement a file transfer between the client and the server using JSP / Beans. The files can be XML Documents, Images (.gif,.jpeg) or even MS Word documents.
The user has a set directory on his file system where the files are to be saved upon download and retrieved upon upload. This system is similar to a check-in check-out system.
How do I get a reference to the directory on the users file system and then either save the downloaded files there or retrieve the files that need to be uploaded.
Thanks
coffeejava

The only way you can do this is by using an applet, a jsp page or servlet does not have access to the system that the browser is running on. Furthermore if you were planning on using the html file form object you cannot set a value for that programmatically. It's not allowed for security reasons.

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Large file transfer problems over client/server socket

Hi,
I wrote a simple chat problem in which I can send files from client to client. The problem is when I send large files over 101 MB the transfer freezes. I do not even get any error mesages in the console. The files I am sending are of any type (Ex mp3, movies, etc...). I am serializing the data into a "byteArray[packetSize]" and sending the file packet by packet until the whole file has been sent, and reconstructed on the other side. The process works perfectly for files smaller than 101MB, but for some reason freezes after that if the file is larger. I have read many forums and there aren't too many solutions out there. I made sure to use the .reset() method to reset my ObjectOutputStream each time I write to it.
Here's my file sending code:
byte[] byteArray = new byte[defaultPacketSize];
numPacketsRequired = Math.ceil(fileSize / defaultPacketSize);
try {
int i = 0;
reader = new FileInputStream(filePath);
while (reader.available() > 0) {
if (reader.available() < defaultPacketSize) {
byte[] lastPacket = new byte[reader.available()];
reader.read(lastPacket);
try {
if (socket == null || output == null) {
throw new SocketException("socket does not exist");
output.writeObject(lastPacket);
output.reset();
output.writeObject("DONE");
output.reset();
output.close();
socket.close();
catch (Exception e) {
System.out.println("Exception ***: " + e);
output.close();
socket.close();
else {
reader.read(byteArray);
try {
if (socket == null || output == null) {
throw new SocketException("socket does not exist");
output.writeObject(byteArray);
output.reset();
catch (Exception e) {
System.out.println("Exception ***: " + e);
output.close();
socket.close();
reader.close();
catch (Exception e) {
System.out.println("COULD NOT READ PACKET");
Here's my file receiving code:
try {
// The message from the client
Object streamInput;
FileOutputStream writer;
byte[] packet;
while (true) {
streamInput = input.readObject();
if (streamInput instanceof byte[]) {
packet = (byte[]) streamInput;
try {
writer = new FileOutputStream(outputPath, true);
writer.write(packet); //Storing the bytes on file
writer.close();
catch (Exception e) {
System.out.println("Exception: " + e);
else if (streamInput.equals("DONE")) {
socket.close();
input.close();
break;
catch (Exception e) {
I'm looking for any way I can possibly send large files from client to client without having it freeze. Are there any better file transfer ways other than socket? I don't really want FTP. I think I want to keep it HTTP.
Any suggestions would be helpful.Thanks!
Evan

I've taken a better look a the code you posted, and
there is one problem with the receiving code. You
keep repeatedly opening and closing the
FileOutputStream. This is not going to be efficient
as the file will keep needing to be positioned to its
end.Yes sorry I did change that code so that it leaves the file open until completely done writing. Basically I have a progress bar that records how far along in the writing process the client is, and when the progress bar reaches 100%, meaning the file is complete, the file.close() method is invoked. Sorry about that.
I also ran some memory tests using the "Runtime.getRuntime().totalMemory()", and "Runtime.getRuntime().freeMemory()" methods. I put these methods inside the loop where I read in the file and send it to the client. here's the output:
Sender's free memory: 704672
File reader read 51200 bytes of data.
767548 left to read.
Sender's runtime memory: 2818048
Sender's free memory: 702968
File reader read 51200 bytes of data.
716348 left to read.
Sender's runtime memory: 2818048
Sender's free memory: 701264
File reader read 51200 bytes of data.
665148 left to read.
Sender's runtime memory: 2818048
Sender's free memory: 699560
File reader read 51200 bytes of data.
613948 left to read.
Sender's runtime memory: 2818048
Sender's free memory: 697856
File reader read 51200 bytes of data.
562748 left to read.
Sender's runtime memory: 2818048
Sender's free memory: 696152
File reader read 51200 bytes of data.
511548 left to read.
Sender's runtime memory: 2818048
Sender's free memory: 694448
File reader read 51200 bytes of data.
460348 left to read.
Sender's runtime memory: 2818048
Sender's free memory: 692744
File reader read 51200 bytes of data.
409148 left to read.
Sender's runtime memory: 2818048
Sender's free memory: 691040
File reader read 51200 bytes of data.
357948 left to read.
Sender's runtime memory: 2818048
Sender's free memory: 689336
File reader read 51200 bytes of data.
306748 left to read.
Sender's runtime memory: 2818048
Sender's free memory: 687632
File reader read 51200 bytes of data.
255548 left to read.
Sender's runtime memory: 2818048
Sender's free memory: 685928
File reader read 51200 bytes of data.
204348 left to read.
Sender's runtime memory: 2818048
Sender's free memory: 684224
File reader read 51200 bytes of data.
153148 left to read.
Sender's runtime memory: 2818048
Sender's free memory: 682520
File reader read 51200 bytes of data.
101948 left to read.
Sender's runtime memory: 2818048
Sender's free memory: 680816
File reader read 51200 bytes of data.
50748 left to read.
Sender's runtime memory: 2818048
Sender's free memory: 679112
File reader read 50748 bytes of data.
0 left to read.
Creating last packet of size: 50748
Last packet size after setting it equal to byteArray: 50748
Here's the memory stats from the receiver:
Receiver's free memory: 639856
Receiver's total memory: 2842624
Receiver's free memory: 638920
Receiver's total memory: 2842624
Receiver's free memory: 637984
Receiver's total memory: 2842624
Receiver's free memory: 637048
Receiver's total memory: 2842624
Receiver's free memory: 636112
Receiver's total memory: 2842624
Receiver's free memory: 635176
Receiver's total memory: 2842624
Receiver's free memory: 634240
Receiver's total memory: 2842624
Receiver's free memory: 633304
Receiver's total memory: 2842624
Receiver's free memory: 632368
Receiver's total memory: 2842624
Receiver's free memory: 631432
Receiver's total memory: 2842624
Receiver's free memory: 630496
Receiver's total memory: 2842624
Receiver's free memory: 629560
Receiver's total memory: 2842624
Receiver's free memory: 628624
Receiver's total memory: 2842624
Receiver's free memory: 627688
Receiver's total memory: 2842624
Receiver's free memory: 626752
Receiver's total memory: 2842624
Receiver's free memory: 625816
Receiver's total memory: 2842624
Receiver's free memory: 624880
Receiver's total memory: 2842624
Receiver's free memory: 623944
Receiver's total memory: 2842624
Receiver's free memory: 623008
Receiver's total memory: 2842624
Receiver's free memory: 622072
Receiver's total memory: 2842624
Receiver's free memory: 621136
Receiver's total memory: 2842624
Receiver's free memory: 620200
Receiver's total memory: 2842624
Receiver's free memory: 619264
Receiver's total memory: 2842624
Receiver's free memory: 618328
Receiver's total memory: 2842624
Receiver's free memory: 617392
Receiver's total memory: 2842624
Receiver's free memory: 616456
Receiver's total memory: 2842624
Receiver's free memory: 615520
Receiver's total memory: 2842624
Receiver's free memory: 614584
this is just a sample of both receiver and sender's stats. Everything appears to be fine! Hope this message post isn't too long.
Thanks!

How to download a file from server machine to client machine using jsp

Hi,
In my application, I have an excel file stored on my server machine. How can I download that excel file on to my client machine using jsp. Is there any other way I can open that file from my machine and save it in my machine using jsp/java?
Its an emergency for me to do this.
Can anyone provide me the full code to download a file from server machine as I don't have
time to browse through various sites.
thanks in advance,
Tiijnar

Please post your code using code tags (click on CODE above the text area, when posting)
response.setContentType("application/octet-stream");Why octet-stream? Set the correct mime-type.
String disHeader = "Attachment; Filename=\"filename\"";The filename should just be the file's name. Not the complete path to the file! This will tell anyone where the file is located on the server. It's also inconvenient because by default,the browser will suggest it as the name for the download.
Your way of writing to the output stream is just plain wrong. See this snippet (picked from [http://balusc.blogspot.com/2007/07/fileservlet.html])
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            input = new BufferedInputStream(new FileInputStream(file), DEFAULT_BUFFER_SIZE);
            output = new BufferedOutputStream(response.getOutputStream(), DEFAULT_BUFFER_SIZE);
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            byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];
            int length;
            while ((length = input.read(buffer)) > 0) {
                output.write(buffer, 0, length);
            // Finalize task.
            output.flush();
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            close(output);
            close(input);
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Is it posssible to lunch one application from the client system using JSP

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ram.

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if possible then please give me the samples..
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How to open a file located at server using JSP

hi,
i would like to open a file located at server as it is. I mean to say, if it a MS Word file, i wanna open it in MS Word, if it an Excel file, i wanna open it in Excel. i know the location (path) of the file. Can someone help me please.
Thanx

The best way would simply be to HREF it.
ie<a href="excelfiles/spreadsheet.xls">Open spreadsheet</a>When a user then clicks on that lick in their browser they should be given the option to either download or (if they have the appropriate program, in this case MS Excel, installed) open it.
This works best if the client is using a version of Internet Explorer (if you're dealing with MS files), but any browser should potentially offer you the option of opening the file.
Beyond that there's no way to specifically open a program on a client machine (it'd be a bit of a security loophole if you could! - Imagine a JSP page being able to open FDISK...). All you can do is pass the file (via the HREF) and let the client decide what to do with it.

How to send an attachment(file) to server using JSP

Hello,
I'm developing a small web-based mail system using JSP and
JavaMail API 1.2. I need to make a compose form which allows to
attach some file. I'm using the following HTML code:
<FORM ENCTYPE="multipart/form-data">
<INPUT TYPE="file" name="somename">
</FORM>
Would you be so kind pointing me which Java code I need to use
to implement it.
Thanks in advance and sorry for my English

see the api for this:
http://www.orionserver.com/docs/api/com/evermind/io/FilePostParse
r.html
you can also use this stuff:
http://www.orionsupport.com/articles/fileupload.html
I have found that Nick Newman's stuff is much better, though,
since it doesn't change with the orion api (the orion api 1.5.3
has changed, so anything you did with the above methods won't
work with 1.5.3 ;().
http://www.orionsupport.com/articles/downloads/UploadServlet.zip
regards,
the elephantwalker
www.elephantwalker.com

Need PL/SQL procedure for file transfer local system to server location

Hi Experts,
The requirement is one file ex: text file,excel file is there in Local system suppose c:newfolder/test.txt.
once run the concurrent program for this particular file in the local system should transfer into server location for the mentioned path.
is it possible to do in PL/SQL or shell script.
can you please share the code.
Thanks
Meher

Meher Irk wrote:
The requirement is one file ex: text file,excel file is there in Local system suppose c:newfolder/test.txt.
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There are standard secure methods for a client to copy a file to a server. Such as sftp and scp. No complex Oracle database server layer needed in-between.
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Dear Experts,
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Thanks in advance,
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p.s. : the http url to the file location is like -->
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hi,
interesting task.
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Downloading xls sheet from application server using jsp page

hi,
I am creating an excel sheet and storing it in application server which runs on HP-UNIX OS. I want to download that excel sheet using jsp page. With the following code snippet i m able to access the jsp page, but i m not able to download xls sheet. its giving "the page cannot be found "error. Is there any other way to download the excel sheet from jsp page.
<%
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%>
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ritu

href should be ur absolure path like
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shanu

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How do you remove all of the file transfer options from the client GUI (the button, the right-click menu option, etc.)?

You can add <argument>allow_attachments=false</argument> in /var/opt/SUNwbsvr7/https:<hostname>/webapps/<hostname>im/en/im.jnlp file
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To upload excel file directly to the application server using OLE concept

hi experts
i have done a coding in OLE to download excel with graph to presentation server, is it possible to upload excel with graph directly to the application server , the excel should have graph while downloading to presentation server fom app server.
Moderator message - duplicate post locked
Edited by: Rob Burbank on Jun 25, 2009 9:49 AM

HI,
have a look at tcode cg3z and then FM 'C13Z_FILE_UPLOAD_ASCII'.
What you can do is, first create the file on presentation server using OLE automation, and then using this FM, write the file to Application server

Client Server using Internet [ask]

I have a client server project who connect between LAN connection and now I want to upgrade it into internet connection. I have search several programs who has similar architecture but none is suitable. Could anybody help me out how to build basic client server which connect using internet connection?
I have attach my previous program below, I really appreciated if anyone may modify it so be able connect trough internet.
Solved!
Go to Solution.
Attachments:
Client.vi ‏262 KB
Server.vi ‏164 KB

Hi,
with your program, you seem to have the full control over your house ;-). Why it shouldn't work over internet as it is? You have TCP open, TCP close...in Internet, you simply have to use other IP-adresses as the local ones. So can you specify your question? Or is it a problem with your LAN-infrastructure, that you have to configure your router to have access from outside?
I don't see why it shouldn't work over Inet...
christian
THINK G!! ;-)
Using LabView 2010 and 2011 on Mac and Win
Programming in Microsoft Visual C++ (Win), XCode (Mac)

Client-Server using RMI on Win2000

I have a client server application using RMI that works on Win NT4.0 when I am connected
to a network or when the it is not connected (workstation is client and server).
This same application does not work as a standalone (not connected to network) when running
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Loopback Adapter but the client do (can) not communicate ( see) the server(s) at all.
Does anyone knows the difference between WinNT4.0 and Win2000 network,
configure Win2000 for client-server on RMI loopback?
Thanks,
Isagani

Yes, I did. But let me expand on the problem and observations.
Running under Win2000 and connected to the network and working.
- I use netstat -n (a util ) to see how my application is running when it is working.
The port (1101) the apps uses eventually loops back to the system and the app is able
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I do not these problem with WinNT4.0
Any ideas?
Thanks,
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How to write files on Client Machine using JSP

Hi,
I am new to JSP. Please tell me how do i write files on Client machine thru a Browser.
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Thanks.
Mehul Dave

1) Well I find it rather convenient to deploy a web app as just one file rather than a bunch of files. For deployment it's much better. However I prefer using expanded files when developping (to use auto reload in Tomcat for example)
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What i do usually is upload it in a completely different directory, something like /uploaded_files. Your uploaded files are therefore completely independant from your webapp
However it is a bit trickyer to get those files back. Let's take the example of image uploads. You have 2 ways of proceeding:
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You can call it this way :
<img src="/serlvets/showmyimage?path=uploaded.gif">
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File Transfer b/w Client - Server using JSP

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