How to make FileUtils appends instead of overwriting text file

Question

I am using the following to write StringBuilder into an existing text file.

FileUtils.writeStringToFile(file, sb.toString(), StandardCharsets.UTF_8);

The problem is that it overwrites the file where I just want to append sb.toString() to the existing content of file. How to workaround this issue?

Take a look at [the API docs](http://commons.apache.org/proper/commons-io/javadocs/api-release/org/apache/commons/io/FileUtils.html), one line down from `writeStringToFile(File file, String data)` is `writeStringToFile(File file, String data, boolean append)` — azurefrog, Apr 29 '16 at 17:35
Maybe this answer will help you. http://stackoverflow.com/a/1625263/5758826 — TubbyStubby, Apr 29 '16 at 17:38

score 4 · Accepted Answer · answered Apr 29 '16 at 17:39

4

It has been implemented in 2.1 version of Apache IO. To append string to the file just pass true as an additional parameter in functions:

example:

 FileUtils.writeStringToFile(file, stringBuilder.toString(), true);

answered Apr 29 '16 at 17:39

Raj K

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score 1 · Answer 2 · answered Apr 29 '16 at 17:38

Assuming you're referring to org.apache.commons.io.FileUtils, there's an overloaded variant that takes a boolean append parameter:

FileUtils.writeStringToFile(file, sb.toString(), StandardCharsets.UTF_8, true);
// Here -----------------------------------------------------------------^

score 0 · Answer 3 · answered Apr 29 '16 at 17:36

0

Simply call the method with the append boolean:

writeStringToFile(File file, String data, Charset encoding, boolean append)

FileUtils.writeStringToFile(file, sb.toString(), StandardCharsets.UTF_8, true);

answered Apr 29 '16 at 17:36

Jean Logeart

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How to make FileUtils appends instead of overwriting text file

3 Answers3