CODEWITHSUNDEEP
javajava-io
Sri
Sri

Reputation: 2473

Create a directory if it does not exist and then create the files in that directory as well

The condition is if the directory exists it has to create files in that specific directory without creating a new directory.

The below code only creates a file with the new directory but not for the existing directory . For example the directory name would be like "GETDIRECTION":

String PATH = "/remote/dir/server/";
    
String fileName = PATH.append(id).concat(getTimeStamp()).append(".txt");  
             
String directoryName = PATH.append(this.getClassName());   
              
File file  = new File(String.valueOf(fileName));

File directory = new File(String.valueOf(directoryName));

if (!directory.exists()) {
        directory.mkdir();
        if (!file.exists() && !checkEnoughDiskSpace()) {
            file.getParentFile().mkdir();
            file.createNewFile();
        }
}
FileWriter fw = new FileWriter(file.getAbsoluteFile());
BufferedWriter bw = new BufferedWriter(fw);
bw.write(value);
bw.close();

Upvotes: 245

Views: 546423

Answers (9)

Inês Gomes
Inês Gomes

Reputation: 4821

Java 8+ version:

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

Files.createDirectories(Paths.get("/Your/Path/Here"));

The Files.createDirectories() creates a new directory and parent directories that do not exist. This method does not throw an exception if the directory already exists.

Upvotes: 330

Pytry
Pytry

Reputation: 6390

I would suggest the following for Java8+.

/**
 * Creates a File if the file does not exist, or returns a
 * reference to the File if it already exists.
 */
public File createOrRetrieve(final String target) throws IOException {
  final File answer;
  Path path = Paths.get(target);
  Path parent = path.getParent();
  if(parent != null && Files.notExists(parent)) {
    Files.createDirectories(path);
  }
  if(Files.notExists(path)) {
    LOG.info("Target file \"" + target + "\" will be created.");
    answer = Files.createFile(path).toFile();
  } else {
    LOG.info("Target file \"" + target + "\" will be retrieved.");
    answer = path.toFile();
  }
  return answer;
}

Edit: Updated to fix bug as indicated by @Cataclysm and @Marcono1234. Thx guys:)

Upvotes: 30

BitsNcode
BitsNcode

Reputation: 21

If you're using Java 8 or above, then Files.createDirectories() method works the best.

Upvotes: 1

Mohammed Fayoumi
Mohammed Fayoumi

Reputation: 11

A simple solution using Java 8

public void init(String multipartLocation) throws IOException {
    File storageDirectory = new File(multipartLocation);

    if (!storageDirectory.exists()) {
        if (!storageDirectory.mkdir()) {
            throw new IOException("Error creating directory.");
        }
    }
}

Upvotes: 1

Saikat
Saikat

Reputation: 16750

Simple Solution using using java.nio.Path

public static Path createFileWithDir(String directory, String filename) {
        File dir = new File(directory);
        if (!dir.exists()) dir.mkdirs();
        return Paths.get(directory + File.separatorChar + filename);
    }

Upvotes: 11

Dr. X
Dr. X

Reputation: 2920

If you create a web based application, the better solution is to check the directory exists or not then create the file if not exist. If exists, recreate again.

    private File createFile(String path, String fileName) throws IOException {
       ClassLoader classLoader = getClass().getClassLoader();
       File file = new File(classLoader.getResource(".").getFile() + path + fileName);

       // Lets create the directory
       try {
          file.getParentFile().mkdir();
       } catch (Exception err){
           System.out.println("ERROR (Directory Create)" + err.getMessage());
       }

       // Lets create the file if we have credential
       try {
           file.createNewFile();
       } catch (Exception err){
           System.out.println("ERROR (File Create)" + err.getMessage());
       }
       return  file;
   }

Upvotes: 1

Jacob R
Jacob R

Reputation: 1251

Trying to make this as short and simple as possible. Creates directory if it doesn't exist, and then returns the desired file:

/** Creates parent directories if necessary. Then returns file */
private static File fileWithDirectoryAssurance(String directory, String filename) {
    File dir = new File(directory);
    if (!dir.exists()) dir.mkdirs();
    return new File(directory + "/" + filename);
}

Upvotes: 35

Mukesh
Mukesh

Reputation: 91

code:

// Create Directory if not exist then Copy a file.


public static void copyFile_Directory(String origin, String destDir, String destination) throws IOException {

    Path FROM = Paths.get(origin);
    Path TO = Paths.get(destination);
    File directory = new File(String.valueOf(destDir));

    if (!directory.exists()) {
        directory.mkdir();
    }
        //overwrite the destination file if it exists, and copy
        // the file attributes, including the rwx permissions
     CopyOption[] options = new CopyOption[]{
                StandardCopyOption.REPLACE_EXISTING,
                StandardCopyOption.COPY_ATTRIBUTES

        };
        Files.copy(FROM, TO, options);


}

Upvotes: 9

Aaron D
Aaron D

Reputation: 7700

This code checks for the existence of the directory first and creates it if not, and creates the file afterwards. Please note that I couldn't verify some of your method calls as I don't have your complete code, so I'm assuming the calls to things like getTimeStamp() and getClassName() will work. You should also do something with the possible IOException that can be thrown when using any of the java.io.* classes - either your function that writes the files should throw this exception (and it be handled elsewhere), or you should do it in the method directly. Also, I assumed that id is of type String - I don't know as your code doesn't explicitly define it. If it is something else like an int, you should probably cast it to a String before using it in the fileName as I have done here.

Also, I replaced your append calls with concat or + as I saw appropriate.

public void writeFile(String value){
    String PATH = "/remote/dir/server/";
    String directoryName = PATH.concat(this.getClassName());
    String fileName = id + getTimeStamp() + ".txt";

    File directory = new File(directoryName);
    if (! directory.exists()){
        directory.mkdir();
        // If you require it to make the entire directory path including parents,
        // use directory.mkdirs(); here instead.
    }

    File file = new File(directoryName + "/" + fileName);
    try{
        FileWriter fw = new FileWriter(file.getAbsoluteFile());
        BufferedWriter bw = new BufferedWriter(fw);
        bw.write(value);
        bw.close();
    }
    catch (IOException e){
        e.printStackTrace();
        System.exit(-1);
    }
}

You should probably not use bare path names like this if you want to run the code on Microsoft Windows - I'm not sure what it will do with the / in the filenames. For full portability, you should probably use something like File.separator to construct your paths.

Edit: According to a comment by JosefScript below, it's not necessary to test for directory existence. The directory.mkdir() call will return true if it created a directory, and false if it didn't, including the case when the directory already existed.

Upvotes: 240

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