Appending to file in utf8

Question

For a project I need to append to a textfile using UTF-8 encoding. During my research I found two possibilities:

BufferedWriter out = new BufferedWriter(
    new OutputStreamWriter(new FileOutputStream("file.txt), "UTF-8")
)

This will write to my file in UTF-8, but it will overwrite it, rather than append to it if it already exist.

Then I found the code to apend to an existing file with a parameter in the FileWriter, but this will not use UTF-8 explicitely, rather than use the default system character set:

BufferedWriter out = new BufferedWriter(new FileWriter("myfile.txt", true))

I now need the possibility to define BOTH the encoding as well as appending to a file. Just rely on the system encoding or change this is not an option.

Any thoughts?

see this answer: https://stackoverflow.com/questions/30307382/how-to-append-text-to-file-in-java-8-using-specified-charset — diginoise, Aug 10 '17 at 13:02

score 5 · Accepted Answer · answered Aug 10 '17 at 13:07

5

You forgot to add the true paramter to the FileOutputStream constructor:

BufferedWriter out = new BufferedWriter(
    new OutputStreamWriter(
        new FileOutputStream("file.txt", true), // true to append
        StandardCharsets.UTF_8                  // Set encoding
    )
);

answered Aug 10 '17 at 13:07

vnea

84
3

duh! Apparently I missed the option to set it on the `FileOutputStream`, I only looked at the `FileWriter` option. – Timothy Grützner Aug 10 '17 at 13:11

score 1 · Answer 2 · answered Aug 10 '17 at 13:10

1

try {
    BufferedWriter out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("myFile.txt", true), "UTF-8"));
    out.write("Hello World");
    out.close();
} catch (IOException e) {
    e.printStackTrace();
}

answered Aug 10 '17 at 13:10

eliaspr

302
3
15

Appending to file in utf8

2 Answers2

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