Ask permission from the user to write files - java

I have a web application that has the feature to upload PDF which is done by the following process:
Create a folder on user's local path ( C:/resource/pdf/ )
Write the PDF file inside the folder.
On my local(running on eclipse/tomcat) it can write the files directly but on the web I actually getting an error:
java.io.FileNotFoundException: C:\resource\pdf\Daily News.pdf (Permission denied)
at java.io.FileOutputStream.open(Native Method)
at java.io.FileOutputStream.<init>(Unknown Source)
...
I'm using Spring MVC if it is related.
Is there a way to ask the user for a permission to write files in their local?


I am assuming you use a File object in your code; if so you can just do this:
File folder;
// set directory and everything
// create folder
folder.setWritable(true, true);
Then you can check if you can write with this:
write = folder.canWrite();
System.out.println(write);

Related

Java - Newly created file on smb share has no user, no group

I mounted a SMB share via fstab:
//IP_SERVER/public /home/sl/images_server cifs username=USER,passwd=PASSWD 0 0
I want to create some new files in /home/sl/images_server. The folder has the mod 777 and the user and group sl.
When I try to save a file via Java I get this error:
java.io.FileNotFoundException: /home/sl/images_server/test.jpg (Permission denied)
I use the following code to write the image:
ImageIO.write(ImageIO.read(SOURCE_FILE), "jpg", new File("/home/sl/images_server/test.jpg"));
After I executed the Java command I see a newly created file in the folder with nobody as user, nogroup as group and '-rw-r--r--' as mod.
What is neccessary to save a file in this folder.

Ok, the problem has nothing to do with Java. It was just my samba server which wasn't configured well.
See this for more informations.
https://askubuntu.com/questions/97669/i-cant-get-samba-to-set-proper-permissions-on-created-directories

i try to read data folder which having files,after running code it shows exception

i am trying to read file,but after running the program it shows exception like,
java.io.FileNotFoundException: (filename) (Access is denied)
at java.io.FileInputStream.open(Native Method)

You can specify the problem precisely. The exception is common when you do not have the required privileges to access or process the files.
Check for the permissions set for a file (For different Users)
You can check the permissions in security tab by right clicking the file.

FileNotFoundException: src\main (Access is denied)

I am going to index files in a folder:
public static final String FILES_TO_INDEX_DIRECTORY = "src/";
File dir = new File(FILES_TO_INDEX_DIRECTORY); //ERROR
File[] files = dir.listFiles();
for (File file : files) {
...
But I got getting this exception:
Exception in thread "main" java.io.FileNotFoundException: src\main
(Access is denied) at java.io.FileInputStream.open(Native Method)
My project is in the desktop:
C:\Users\hamed\Desktop\SearchEngine

When building the Drools examples in Eclipse (Win7), I had Access Denied build errors like:
Caused by: java.io.FileNotFoundException: C:\opta\drools-distribution-7.7.0.Final\examples\sources\.classpath (Access is denied)
Checking file .classpath turned out to have hidden attribute set in Win7.
Unchecking the hidden attribute brought me to the next build error for .project.
Also hidden, and unchecking that gave immediate build success.

Which line causes the FileNotFoundException? If I try your code, the line marked // ERROR always works, both with valid as well as with non-existent file names.
I suspect the exception happens in a later line (which you have not given in your snippet).
It may actually really be what the error message says (access denied).
Check the file permissions. It can be tricky on Windows, when copying the files from somewhere else.

Access php temp file with java

I like to access an uploaded file which is temporarily stored in /tmp via php.
If I try to access it using the tmp_name from php which is the path I get this error:
java.io.FileNotFoundException: /tmp/php5UY3Ag (Permission denied)
The file is there. Otherwise I would get this error:
java.io.FileNotFoundException: /tmp/php5UY3Ag (No such file or directory)
I'm using the PHP JAVA Bridge to hand over the path.
Java is running under apache tomcat and php under the apache web server.
What do I have to do to get this working?

Create new file on server with shared directory (java)

I am not familiar with Windows shared folders, but here is what I have:
filePath = //server/TEMP/ **(1)**
server = another machine. TEMP = shared folder.
If I open this line with Explorer it goes to
http://server/TEMP/
and I can see list of files and create new.
If I change
filePath = \\server\TEMP\ **(2)**
(slashes replacement) I CAN'T open this directory.
in java code (1.6) I have
File f = new File(filePath);
where filePath can be (1) or (2) - no matters, after creating the File object its .toString() gives me
\\server\TEMP\ (2)
which CAN'T execute .createNewFile() with this exception:
java.io.IOException: The network path was not found at
java.io.WinNTFileSystem.createFileExclusively(Native Method) at
java.io.File.createNewFile(Unknown Source)
How to say to java not to convert my slashes? or how to create file without java.io.File?
Thanks,
Roman.

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