Working with UTF-8 characters, Java

Question

My basic code is trying to check files exitence, based on paths, but it can't deal with Unicode Characters:

        Scanner scanner = new Scanner(System.in);
        String input = scanner.nextLine();
        File f = new File(input);
        if (f.exists()) {
            System.out.println("File is Found, According to java.io");
        } else {
            System.out.println(f.toString() + " is Not Existed, According to java.io ");
        }

        Path x = Paths.get(input);
        if (Files.exists(x)) {
            System.out.println("File is Found, According to java.nio");
        } else {
            System.out.println(x.toString() + " is Not Existed, According to java.nio");
        }

when the input (ie. file path) is in ASCII, the code works fine, but when the input contains UTF-8 chars, the code fails in both :

1- printing the input properly.

2- determining does the file exist (ie. even when the file exists, the code tells that file is not exited)

Example:

input:

c://€.jpg

output:

c:\�.jpg is Not Existed, According to java.io

c:\�.jpg is Not Existed, According to java.nio

I use NetBeans, Java 1.8, maven.

PS: I tried to use:

run with :

-Dfile.encoding=UTF-8

add the followign to project properties :

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

, but nothing happened.

Any help, please?

The problem is that you need to use the proper input encoding, so the string is correct. Check with a debugger that input contains exactly what you expect when set. You will probably be surprised. — Thorbjørn Ravn Andersen
– Thorbjørn Ravn Andersen, Commented Dec 4, 2017 at 0:41

Izruo · Accepted Answer · 2017-12-03 15:00:38Z

1

Precisely, you don't need a file encoding, but an input encoding. Therefore you can specify a charset for your Scanner using the Scanner(InputStream source, String charsetName) constructor:

Scanner scanner = new Scanner(System.in, "UTF-8");

answered Dec 3, 2017 at 15:00

Izruo

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2 Comments

Nosairat Over a year ago

sorry, but nothing has changed.

Tom Blodget Over a year ago

@Nosairat Try piping your input from a text file that you encode in UTF-8. It's likely that the encodings for your terminal and Scanner are not in alignment or don't support the characters that you are trying to use.

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