[java] How to create a file in a directory in java?

If I want to create a file in C:/a/b/test.txt, can I do something like:

File f = new File("C:/a/b/test.txt");

Also, I want to use FileOutputStream to create the file. So how would I do it? For some reason the file doesn't get created in the right directory.

To create a file and write some string there:

BufferedWriter bufferedWriter = Files.newBufferedWriter(Paths.get("Path to your file"));
bufferedWriter.write("Some string"); // to write some data
// bufferedWriter.write("");         // for empty file
bufferedWriter.close();

This works for Mac and PC.

String path = "C:"+File.separator+"hello";
String fname= path+File.separator+"abc.txt";
    File f = new File(path);
    File f1 = new File(fname);

    f.mkdirs() ;
    try {
        f1.createNewFile();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

This should create a new file inside a directory

A better and simpler way to do that :

File f = new File("C:/a/b/test.txt");
if(!f.exists()){
   f.createNewFile();
}

Source

You need to ensure that the parent directories exist before writing. You can do this by File#mkdirs().

File f = new File("C:/a/b/test.txt");
f.getParentFile().mkdirs();
// ...

For using the FileOutputStream try this :

public class Main01{
    public static void main(String[] args) throws FileNotFoundException{
        FileOutputStream f = new FileOutputStream("file.txt");
        PrintStream p = new PrintStream(f);
        p.println("George.........");
        p.println("Alain..........");
        p.println("Gerard.........");
        p.close();
        f.close();
    }
}

When you write to the file via file output stream, the file will be created automatically. but make sure all necessary directories ( folders) are created.

    String absolutePath = ...
    try{
       File file = new File(absolutePath);
       file.mkdirs() ;
       //all parent folders are created
       //now the file will be created when you start writing to it via FileOutputStream.
      }catch (Exception e){
        System.out.println("Error : "+ e.getmessage());
       }

Create New File in Specified Path

import java.io.File;
import java.io.IOException;

public class CreateNewFile {

    public static void main(String[] args) {
        try {
            File file = new File("d:/sampleFile.txt");
            if(file.createNewFile())
                System.out.println("File creation successfull");
            else
                System.out.println("Error while creating File, file already exists in specified path");
        }
        catch(IOException io) {
            io.printStackTrace();
        }
    }

}

Program Output:

File creation successfull

With Java 7, you can use Path, Paths, and Files:

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

public class CreateFile {

    public static void main(String[] args) throws IOException {
        Path path = Paths.get("/tmp/foo/bar.txt");

        Files.createDirectories(path.getParent());

        try {
            Files.createFile(path);
        } catch (FileAlreadyExistsException e) {
            System.err.println("already exists: " + e.getMessage());
        }
    }
}

Use:

File f = new File("C:\\a\\b\\test.txt");
f.mkdirs();
f.createNewFile();

Notice I changed the forward slashes to double back slashes for paths in Windows File System. This will create an empty file on the given path.

Surprisingly, many of the answers don't give complete working code. Here it is:

public static void createFile(String fullPath) throws IOException {
    File file = new File(fullPath);
    file.getParentFile().mkdirs();
    file.createNewFile();
}

public static void main(String [] args) throws Exception {
    String path = "C:/donkey/bray.txt";
    createFile(path);
}