Develop Reference

Upload a file to an SFTP server using PDFBox save method without storing the file to the local system?

I'm trying to save the edited PDF which I fetched from the remote server back to its location without having it downloaded/stored on the local machine. I'm using JSch SFTP method to get the input PDF file from the SFTP server using
x = new BufferedInputStream(channelSftp.get("example.pdf"));
PDDocument document = PDDocument.load(x);
and after doing some edits using PDFbox, I'm trying to save it using:
documents.save(new File("ftp/path/location"));
I am not able to because I know it only works for your local directory only. Also I can see that document.save accept OutputStream` parameter, but I do not know how to use it here.
I don't have any problems with taking input using stream reader.
All I need is to save that edited PDF back to its location (possibly replace) without having to download it on my local system.

Use the ChannelSftp.put overload that returns OutputStream:
try (OutputStream out = channelSftp.put("example.pdf")) {
documents.save(out);
}

Accessing Remote files using HTTP from a web application

we have a requirement where all file (text , image , PDF etc) uploaded in the Server1. Now we have a Java web application running in a different server (Server 2) which has to read these files and show it in the GUI.
FTP is blocked in web application server. So i am thinking of using HTTP.
The files in Server1 is not distributed .i.e not inside any ear or war.
I managed to get the code to read a file from HTTP.
My question is
- How do i access this file through HTTP when these files are not distributed
- When i write a code accessing the file like http://server1:port1/location of file , its says file not found .
- how do i expose these files , so that i can access it via HTTP from my web application

That means, you want to download the content of the file.
Well at very first, open up a browser. Enter http://server1:port1/FILE_PATH .
what do you get as a response ?
Second, if you get "FILE NOT FOUND" then you need to configure a virtual path mapped to real path in server1. After that, try the URL from browser again. When it works,
URL website = new URL("http://server1/file_location");
ReadableByteChannel rbc = Channels.newChannel(website.openStream());
FileOutputStream fos = new FileOutputStream("file_name");
fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
will help you to download the file to your local machine.

Read a .txt file from an anonymous FTP page?

My goal is to to convert a .txt file on an FTP page to a simple String for easy manipulation.
The specific .txt file is here: ftp://ftp.nasdaqtrader.com/SymbolDirectory/nasdaqlisted.txt. It is an anonymous FTP page, so when I use my computer's browser, there's no need for a username or password.
I've tried incorporating different codes and tips from the following sources:
Reading Text File From Server on Android
http://examples.javacodegeeks.com/core-java/apache/commons/net-commons/download-file-from-ftp-server/
How to read a text file via FTP?
Reading txt file from an ftp server and returning it from AsyncTask
unable to read file from ftp in android?
Howto do a simple ftp get file on Android
http://www.javaworld.com/article/2073325/java-app-dev/java-ftp-client-libraries-reviewed.html
http://developer.android.com/reference/java/net/URLConnection.html
None of what I've tried above helped. I'm not quite sure what I'm doing wrong.
To be clear, all I want to do is to get the plain text from the posted .txt file. I have no interest in downloading said file onto my device's memory.
If you could provide me with a step-by-step explanation on how to do this, I'd be very thankful.

Ok. I've got it. For those who are in the same boat, the step-by-step answer is below:
A lot of problems other users were encountering could be solved by having permissions for internet turned on in the manifest, but mine was a little more complicated. Turns out, the main trick is to not include ftp:// in the address in Java.* Also, when you are entering an FTP site, make sure you enter via the root page, so my original page of ftp://ftp.nasdaqtrader.com/SymbolDirectory/nasdaqlisted.txt becomes: ftp.nasdaqtrader.com.
Make sure to download and include the right Apache Commons library in your project (here: http://commons.apache.org/proper/commons-net/download_net.cgi).
Connect to the root page:
FTPClient ftpClient = new FTPClient();
ftpClient.connect("ftp.nasdaqtrader.com");
Login anonymously, in this case, both username and password are "anonymous". This might be the case with many FTP pages, but I can't be sure:
ftpClient.login("anonymous", "anonymous");
Then, go to the correct directory (be careful about including/excluding the slashes):
ftpClient.changeWorkingDirectory("/SymbolDirectory");
Finally! You can now get the InputStream from the posted text file:
InputStream is = new BufferedInputStream(ftpClient.retrieveFileStream("nasdaqlisted.txt"));
Then, convert the InputStream into String and manipulate as needed. There are many ways to do this. One of which can be found here: How can I convert InputStream data to String in Android SOAP Webservices
*Source: Android FTP connection Failed

If you get "425 Unable to build data connection: Connection timed out" error, then after connecting to ftp server, I would recommend you to set the local mode to passive mode by the following statement.
ftpClient.enterLocalPassiveMode();

How to pass image URL from from a HTTP server in selenium

https://saucelabs.com/resources/selenium-file-upload
I am trying to follow the above sample, but I would like to pass the input image file from a HTTP server instead of the local disk. How should I do it? I tried with the HTTP url but it doesn't seem to work as an argument.

You can't directly pass a file that is not on your local drive.
but you can do it in 2 steps:
1 - download the file. ex with http://commons.apache.org/proper/commons-io/:
FileUtils.copyURLToFile(aRemoteUrl, aLocalFile)
2 - upload the local file (as explained in your link)
(you can eventually delete the local file after that)

How do I get url of uploaded file

I'm using apache.commons library for uploading file to a ftp server. It uploads file successful, but then I want to have a link to that file, that anyone can download it. How do I get the URL of uploaded file ?
Thanks.

One of the great features of an FTP server is the ability to use direct FTP links. With a direct link, you can use links to files and directories in emails and on your websites. Think of this: instead of sending a big attachment in an email, send a link to the file instead.
The format is really simple:
ftp:// username [colon] password [at] server.exavault.com [slash] folder-or-filename
For example: ftp://links:pass#test.exavault.com/transfer.pdf
source : http://www.exavault.com/docs/help/faq/transferring/direct-links