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.
Related
I have logs in folder /home/a/b (located in a remote server)
I want to display logs in my web browser using Java. To get data in the folder /home/a/b and to display them on my web page, what are some methods(API) I can use?
The simplest approach I can imagine is using a SSH API like JSch,
but I don't know how performatic this is.
Anyway, here goes a good example:
https://stackoverflow.com/a/9019095/7528396
Note that you can read the remote file and render line by line.
I develop a web application using JDeveloper. Then, my scenario is I want to get a file from client directory (e.g. C://Image.jpg). What I want to achieve is the client's directory defined programmatically. So, I used InputStream, but it will search a file in server directory. if I used UploadedFile, I don't know how to define it. Note that I don't want to use InputFile.
Does anyone have a solution for me?
Search for HTTP File Upload. You need an <input type='file'> control on your webpage, and form encoding set as enctype='multipart/form-data'.
Generally, you can't control the default directory where the browser is going to open a file chooser -- it normally starts from the "user home" directory, but other dirs can be navigated to.
does anyone know how to create HTTP server in Java, but set default folder for web and than load files from it? I want to use com.sun.net.httpserver class.
For example, I have folder named abc next to my java file. The java file runs HTTP server under port 8080. And if I open address http://123.123.123.123:8080/ I want to see list of files from folder abc. In folder abc are some files, eg. image.jpg. So I want to open in my browser address to image file, like http://123.123.123.123:8080/image.jpg. This way I can open all other files from folder abc (also subfolders, files in subfolders etc.).
Is it possible to create this HTTP server?
Would it be somehow possible to run PHP files in the folder?
Thank you very much for your answers.
Why not using embedded Jetty? I am pretty sure that with it you can accomplish what you are looking for.
If you want to execute PHP from within Jetty, refer to http://docs.codehaus.org/display/JETTY/Jetty+and+PHP
Once you have created your server object, you need to register some handlers for the path you want the user to use to fetch documents.
HttpServer server = HttpServer.create(new InetSocketAddress("localhost",8080));
HttpHandler myDocsHandler = new MyDocsHandler();
server.createContext("/abc", myDocsHandler);
There are no built in default handlers, so you will need to write the MyDocsHandler class that implements the HttpHandler interface to handle any requests coming into your server at http://localhost:8080/abc.
The handler requires a single handle method that takes an HttpExchange argument that gives access to the request data and the response stream. It is your responsibility at this point to do what needs doing. So if you wanted the actual files to be located on your hard driver at /usr/local/abc your handler would need to open the requested file using standard file io and stream it back to the user.
What's the protocol for local files using URL? I've downloaded a file using Java and I need to know how to access it, not using File, but using URL.
Unix
file://localhost/<path>
file:///<path>
Windows
file://localhost/<drive>|/<path>
file:///<drive>|/<path>
file://localhost/<drive>:/<path>
file:///<drive>:/<path>
For more information see the related Wikipedia article.
You may use file:/// and file path. For e.g. file:///c:/temp.txt
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.