FileOutputStream set encoding with write byte to file

Question

i have a csv file that i save it with utf-8 encoding like below: reference

FileOutputStream fileOut =fileOut = new FileOutputStream(file, true);
       
/*utf-8 setting*/
fileOut.write(0xef);
fileOut.write(0xbb);
fileOut.write(0xbf);

 /*append another string*/
 PrintWriter printWriter = new PrintWriter(fileOut);
 printWriter.write(...);

i write string to file and it work correctly with UTF-8 encodeing.

my question is :

anyone know what is this bytes?
how can change it to another encoding like cp1256?
is a list that provide all encoding for that?

UPDATE: assume that i save huge string data that create in pagination and i can not store this size of data in one time.

thanks

That's an UTF-8 [BOM](https://en.wikipedia.org/wiki/Byte_order_mark), nature's cruellest mistake. You can't change the encoding with that. — Kayaman, Sep 23 '20 at 07:50

score 2 · Answer 1 · answered Sep 23 '20 at 07:58

2

Why you don't use the FileUtils from Apache Commons? This will make your life much easier. ;-)

And, If you want to covert the content, have a look here: Encoding conversion in java

<!-- https://mvnrepository.com/artifact/commons-io/commons-io -->
<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.8.0</version>
</dependency>

answered Sep 23 '20 at 07:58

Mirko

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as i have huge data for save in csv file, i need save it per data pagination. so FileUtils.write( file,"data",Charset) is not help me. i edit question – Amir Azizkhani Sep 23 '20 at 08:16
1

ok i use 4th parameter of `FileUtils.write` and it help me. thank you i plus this answer – Amir Azizkhani Sep 23 '20 at 08:28

FileOutputStream set encoding with write byte to file

1 Answers1