Java 8 – Reading a file as String

by Gennady Degterev · 7. October 2017

There are a lot of examples how to read a file content in Java 8.
The most common one is

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;

    public static void main(String[] args) throws IOException {
        String content = new String(Files.readAllBytes(Paths.get("duke.java")));
    }

import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Paths;

public static void main(String[] args) throws IOException {

String content = new String(Files.readAllBytes(Paths.get("duke.java")));

}

However, you can receive different results for the same file on different operation systems!

Use always a charset with String to Byte array transformations and vice versa to achieve a cross-platform identical output from this code section:

import java.io.IOException;
import java.nio.file.*;
import static java.nio.charset.StandardCharsets.UTF_8;
import static java.nio.charset.StandardCharsets.ISO_8859_1;

    public static void main(String... args) throws IOException {
      String stringContent = new String(Files.readAllBytes(Paths.get("duke.java")), UTF_8);
      byte[] byteIso8859Content = stringContent.getBytes(ISO_8859_1);
    }

import java.io.IOException;

import java.nio.file.*;

import static java.nio.charset.StandardCharsets.UTF_8;

import static java.nio.charset.StandardCharsets.ISO_8859_1;

public static void main(String... args) throws IOException {

String stringContent = new String(Files.readAllBytes(Paths.get("duke.java")), UTF_8);

byte[] byteIso8859Content = stringContent.getBytes(ISO_8859_1);

}

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Java 8 – Reading a file as String

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