Create a temporary java.io.File from byte[]

Question

I must use an existing method that is like saveAttachment(Attachment attachment) where Attachment has a File attribute.

My problem is that I'm retrieving a byte[] and I want to save it using this method. How can I have a "local" File just for saving ?

Sorry if my question is dumb, I don't know much about Files in Java.

From where you are retreiving byte[]? Where you want to save your data? Need more context & explanation — Piotr Müller
– Piotr Müller, Commented Sep 25, 2013 at 13:38
I save the data using a method that itself uses alfresco community sdk to store the file, so I can't change the way it is saved. And I retrieve the byte from a web-service that does not provide other information. For those reasons I didn't give more details in my question. — Adrien Gorrell
– Adrien Gorrell, Commented Sep 25, 2013 at 13:54

TheKojuEffect · Accepted Answer · 2013-09-25 13:49:49Z

56

File tempFile = File.createTempFile(prefix, suffix, null);
FileOutputStream fos = new FileOutputStream(tempFile);
fos.write(byteArray);

Check out related docs:

answered Sep 25, 2013 at 13:49

TheKojuEffect

21.2k20 gold badges94 silver badges127 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

user2474948 · Accepted Answer · 2013-09-25 13:43:27Z

5

Reading All Bytes or Lines from a File

Path file = ...;
byte[] fileArray;
fileArray = Files.readAllBytes(file);

Writing All Bytes or Lines to a File

Path file = ...;
byte[] buf = ...;
Files.write(file, buf);

answered Sep 25, 2013 at 13:43

user2474948

Kayaman · Accepted Answer · 2013-09-25 13:38:43Z

3

You're in luck.

File.createTempFile(String prefix, String suffix)

Creates a file in the default temp directory of the OS, where it's guaranteed you can write to.

answered Sep 25, 2013 at 13:38

Kayaman

73.8k6 gold badges91 silver badges128 bronze badges