Get total size of file in bytes

Question

Possible Duplicate:
java get file size efficiently

I have a File called filename which is located in E://file.txt.

FileInputStream fileinputstream = new FileInputStream(filename);

What I want to do is to calculate the size of this file in bytes. How can I have this done?

This is not a duplicate answer. How to get a file size and how to get a file size efficiently are two different topics. — Jan Bodnar, Nov 18 '17 at 13:10

score 292 · Accepted Answer · answered Jan 23 '13 at 11:47

292

You can use the length() method on File which returns the size in bytes.

answered Jan 23 '13 at 11:47

Swapnil

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This is a perfect answer, and I know I have done a bunch of weird things to get this in the past to get the size of a file. Wish I knew about this a long time ago! – RESTfulGeoffrey Jul 14 '18 at 07:08

Hui Zheng · Answer 2 · 2013-01-23T12:00:26.767

50

You don't need FileInputStream to calculate file size, new File(path_to_file).length() is enough. Or, if you insist, use fileinputstream.getChannel().size().

edited Jan 23 '13 at 12:00

answered Jan 23 '13 at 11:48

Hui Zheng

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What does it return? `fileinputstream.getChannel().size()` – Illep Jan 23 '13 at 15:27
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please refer to http://docs.oracle.com/javase/6/docs/api/java/nio/channels/FileChannel.html#size() – Hui Zheng Jan 23 '13 at 15:38

score 7 · Answer 3 · answered Jan 23 '13 at 11:48

7

You can do that simple with Files.size(new File(filename).toPath()).

answered Jan 23 '13 at 11:48

akaIDIOT

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In hindsight, needing both `Path` and `File` might be quite verbose, @Swapnil's answer might be more concise. – akaIDIOT Jan 23 '13 at 11:51
Yes but Java.nio.Files is defined for java 1.7+ – Mirko Cianfarani Jul 28 '15 at 14:14
Note that Java 1.6 has been end of life for a while. Even 1.7 is effectively eol as of April 2015. I don't think this being available in 1.7+ is a real issue. – akaIDIOT Jul 29 '15 at 08:24
http://stackoverflow.com/questions/2034427/where-is-java-nio-file – Mirko Cianfarani Jul 29 '15 at 08:48
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I'm writing this in 2015, and Java 1.6 is still used (and maintained!) in production where I work. Legacy systems are common in the real world... – Andres F. Sep 02 '15 at 14:43

score 6 · Answer 4 · answered Jan 23 '13 at 11:49

6

public static void main(String[] args) {
        try {
            File file = new File("test.txt");
            System.out.println(file.length());
        } catch (Exception e) {
        }
    }

answered Jan 23 '13 at 11:49

Avinash Nair

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Get total size of file in bytes

4 Answers4

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