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Is there a way to redirect WOPI rest calls to read share point files?

We are integrating Office Online with our application to open Open Microsoft Office files(.docx, .xls, .pptx, etc.). To do that, we use the WOPI protocol.
These files can be local files or files hosted on SharePoint.
For SharePoint files to open them with office online through our application, we have to perform the following steps:
the control comes to WOPI getFileInformationCall
we need to hit the Microsoft graph API
to download the file
we read the file and return the file information from the REST call.
This all steps take time and are a bit fragile. Does anyone know if there is a way to redirect WOPI REST calls to get SharePoint files? Or is there another way to optimize these steps?

You can return FileUrl as a property returned from CheckFileInfo operation.
FileUrl is a URI to the file location that the WOPI client uses to get the file. If this is provided, the WOPI client may use this URI to get the file instead of a GetFile request.

How can i get the path of client side download location in java servlet or jsp?

suppose in my web app user click on download button so a file downloaded into his system. So can i get that client's download location like where the recent downloaded file present in my client system

You cannot get this information.
It is sandboxed, the server will not be informed by the client about the location.

This is not possible since you don't have access to user's file system through the browser (JavaScript).
Maybe using a module or whatever directly in the browser.

You don't. All you get is the file name...
What woule it help you anyway as your server does not have the same structure.

Reading a remote file with java on linux

I need to read a remote file using a java app, but the file is in apache server on linux.
I tried with "\\" but doesn't work like windows.
How can i do that?

You'll need to use the URL class:
http://download.oracle.com/javase/1.4.2/docs/api/java/net/URL.html
This is the standard way of reading files from a URL.

Try accessing your file via web browser using url formatted like:
http://server-name-or-ip/path/filename
When you see your file in browser, use that url from your Java app, too.

This depends on a number of things. But we don't really know what question you're asking. Are you asking how to retrieve a document over HTTP? How to do a file copy from Linux? Network shares?
If the file is served by the webserver (in the docroot), the easiest way is probably to request it over HTTP using the URL class as stated above.
If the file is NOT under the webroot (i.e. can't be specified as http://webserver.name/some/path/to/file) then you'll need to use some other method. I'm assuming this is what you meant - you mention \\, the Windows file-sharing (SMB) protocol prefix. The easiest way is to use SSH and scp/sftp, which is probably already installed on the Linux machine - you may need to enable it, and you'll need a login. Then it's as simple as scp user#host:/remote/file/path local/path. You can set up SSH keys to avoid a password.

Is there any way to access http://<someserver.com>:<portnumber>/logs.log.txt using Java code in windows

I am trying to get file attributes present in a Unix server and when I type this url in my IE it displays the files in the file-folder-directory architecture.
I am planning to write a code for a tool such that I can automate the process of getting the file attributes like file modified date,size of file etc.
Are there any Methods/ways to do this?
Does this code work:
File file = New File("http://<someserver.com>:<portnumber>/logs/log.txt");
Date date = file.LastModifiedDate();
System.out.println("modifed date is"+date);

If the protocol your server supports is only HTTP, I'm afraid there's no easy way to do this. You will have to:
parse the returned HTML, probably looking for <a href= tags (using some html parser, but not with regex)
open those links with new URL(url).openConnection(), read their streams, and do the same thing recursively, until an actual file (and not directory) is found.
But this won't give you the file attributes - only the name and the file contents.
If you want to browse, you need a different protocol, like FTP or SCP.

The HTTP protocol won't help you here. HTTP does not publish any file attributes, except for the Content-length (file size) and the Last-Modified header value which doesn't necessarily mirror the actual file modification date. Also it might not be sent by the HTTP Server at all.
Your best bet would be using an FTP library for example the one from Apache Commons Net.
If you decide to use this library, you can use the properties of the FTPFile class, for example the file size, file date and permissions.

Is it possible to write files to a remote directory using java?

I have the directory mapped on my machine so that I can browse and write to it via Windows explorer. I would like to write files via java.
File f = new File("http://dev1:8080/data/xml/myTestFile123.xml");
f.createNewFile();
I am getting the following error:
Exception in thread "main" java.io.IOException: The filename, directory name, or volume label syntax is incorrect
at java.io.WinNTFileSystem.createFileExclusively(Native Method)
at java.io.File.createNewFile(Unknown Source)
at MainTest.createTestFile(MainTest.java:156)
at MainTest.main(MainTest.java:72)
Is there any way to write files to a mapped directory that has the http:// in front? Because thats the way the directory is provided to me. It is a virtual directory that an oracle database is creating.

My understanding is that you are trying to write to an Oracle XML DB Repository. Oracle XML DB Repository is a feature that has been introduced by Oracle9i Database Release 2 for XML storage and that can be accessed through FTP or HTTP/WebDAV. In your case, it looks like you're trying to use HTTP/WebDAV.
As explained in the WedDAV page on Wikipedia:
WedDAV is a set of extensions on
top of HTTP that allows users to edit
and manage files collaboratively on
remote World Wide Web servers.
In other words, adding files, deleting them, renaming them, etc in a WebDAV repository is done using HTTP words: PUT, DELETE, MOVE, etc (see RFC 4918 for more details).
Consequently, interacting with a WebDAV server can be done using classes from java.net.
Or you could use a higher level API like Jakarta Commons HttpClient.
Or you could use a Java WebDAV client like the one provided by the Slide project. This article shows how to do it and it looks simple. However, as the Slide project is now retired, I wouldn't recommend it.
Luckily (or not), the Apache Jackrabbit project is an alternative to Slide... but AFAIK the WebDAV support in Jackrabbit is more focused on server-side implementations than clients. Anyway, you'll find some code samples in this thread on the jackrabbit-users mailing list.
I think I'd choose HttpClient and use the Tutorial or the Sample Code as starting points.

I'm not really sure what I'm talking about here (not a Java guy) but although you may "have it mapped" you're passing in a URL instead of an expected file system path. If (for example) you have a mapped drive under Windows, use the drive letter assigned.

Your trying to pass the location URI with a protocol. You need to pass location sans protocol:
\\dev1\data\xml\myTestFile123.xml

Instead of trying to using a mapped drive letter (seems very weak), have a look at JCIFS:
JCIFS is an Open Source client library that implements the CIFS/SMB networking protocol in 100% Java. CIFS is the standard file sharing protocol on the Microsoft Windows platform (e.g. Map Network Drive ...). This client is used extensively in production on large Intranets.
This piece of code shows how to Logon to a Remote Machine and Write File using jCifs (credits to Muneeb Ahmad):
import jcifs.smb.NtlmPasswordAuthentication;
import jcifs.smb.SmbFile;
import jcifs.smb.SmbFileOutputStream;
public class Logon {
public static void main( String argv[] ) throws Exception {
String user = "user:password";
NtlmPasswordAuthentication auth = new NtlmPasswordAuthentication(user);
String path = "smb://my_machine_name/D/MyDev/test.txt";
SmbFile sFile = new SmbFile(path, auth);
SmbFileOutputStream sfos = new SmbFileOutputStream(sFile);
sfos.write("Muneeb Ahmad".getBytes());
System.out.println("Done");
}
}
Edit: As mentioned in a comment added to the original question, my understanding is now that you are trying to write to a WebDAV directory. I'll cover the WebDAV topic in another answer for more clarity.

How have you mapped the file in Windows? I suspect it is not using the HTTP protocol, because no such mechanism exists for creating files. So you will not get anywhere using "http" as your protocol.
Find the mapped drive letter, you probably want something more like:
File f = new File("F:\\dir\\file.ext");
If you are using Samba you might want to take a look at JCIFS then you can use:
smb://server/share/

Use the local path
If you can see myTestFile123.xml in windows explorer, then right-click it and copy the Location: property value. Then use exactly this as the new File() argument, but either double up the backslashes or change them to forward slashes.