Java's createNewFile() - will it also create directories?

I've got a conditional to check if a certain file exists before proceeding (./logs/error.log). If it isn't found I want to create it. However, will

File tmp = new Fil开发者_如何学Ce("logs/error.log");
tmp.createNewFile();

also create logs/ if it doesn't exist?

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No.
Use tmp.getParentFile().mkdirs() before you create the file.

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File theDir = new File(DirectoryPath);
if (!theDir.exists()) theDir.mkdirs();

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File directory = new File(tmp.getParentFile().getAbsolutePath());
directory.mkdirs();

If the directories already exist, nothing will happen, so you don't need any checks.

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Java 8 Style

Path path = Paths.get("logs/error.log");
Files.createDirectories(path.getParent());

To write on file

Files.write(path, "Log log".getBytes());

To read

System.out.println(Files.readAllLines(path));

Full example

public class CreateFolderAndWrite {

    public static void main(String[] args) {
        try {
            Path path = Paths.get("logs/error.log");
            Files.createDirectories(path.getParent());

            Files.write(path, "Log log".getBytes());

            System.out.println(Files.readAllLines(path));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

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StringUtils.touch(/path/filename.ext) will now (>=1.3) also create the directory and file if they don't exist.

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No, and if logs does not exist you'll receive java.io.IOException: No such file or directory

Fun fact for android devs: calls the likes of Files.createDirectories() and Paths.get() would work when supporting min api 26.