Java FileOutputStream Create File if not exists

Question

Is there a way to use FileOutputStream in a way that if a file  String filename  does not exist  then it will create it   FileOutputStream oFile   new FileOutputStream  score txt   false

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Just Giving an alternative way to create the file only if doesn t exists using Path and Files   Path path   Paths get  Some path filename txt    Files createDirectories path getParent     if   Files exists path       Files createFile path   Files write path       getBytes

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File f   new File  Test txt    if  f exists       f createNewFile     else    System out println  File already exists        Pass this f to your FileOutputStream constructor

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Create file if not exist  If file exits  clear its content          Create file if not exist         param path For example   D  foo xml      public static void createFile String path        try           File file   new File path           if   file exists                  file createNewFile              else               FileOutputStream writer   new FileOutputStream path               writer write      getBytes                 writer close                    catch  IOException e            e printStackTrace

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Before creating a file  it s needed to create all the parent s directories   Use yourFile getParentFile   mkdirs

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new FileOutputStream f  will create a file in most cases  but unfortunately you will get a FileNotFoundException      if the file exists but is a directory rather than a regular file  does not exist but cannot be created  or cannot be opened for any other reason   from Javadoc  I other word there might be plenty of cases where you would get FileNotFoundException meaning  Could not create your file   but you would not be able to find the reason of why the file creation failed   A solution is to remove any call to the File API and use the Files API instead as it provides much better error handling  Typically replace any new FileOutputStream f  with Files newOutputStream p    In cases where you do need to use the File API  because you use an external interface using File for example   using Files createFile p  is a good way to make sure your file is created properly and if not you would know why it didn t work  Some people commented above that this is redundant  It is true  but you get better error handling which might be necessary in some cases

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You can potentially get a FileNotFoundException if the file does not exist  Java documentation says   Whether or not a file is available or may be created depends upon the underlying platform http   docs oracle com javase 7 docs api java io FileOutputStream html  If you re using Java 7 you can use the java nio package   The options parameter specifies how the the file is created or opened    it opens the file for writing  creating the file if it doesn t exist    http   docs oracle com javase 7 docs api java nio file Files html

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It will throw a FileNotFoundException if the file doesn t exist and cannot be created  doc   but it will create it if it can  To be sure you probably should first test that the file exists before you create the FileOutputStream  and create with createNewFile   if it doesn t    File yourFile   new File  score txt    yourFile createNewFile       if file already exists will do nothing  FileOutputStream oFile   new FileOutputStream yourFile  false

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You can create an empty file whether it exists or not      new FileOutputStream  score txt   false  close      if you want to leave the file if it exists      new FileOutputStream  score txt   true  close      You will only get a FileNotFoundException if you try to create the file in a directory which doesn t exist

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FileUtils from apache commons is a pretty good way to achieve this in a single line   FileOutputStream s   FileUtils openOutputStream new File   home nikhil somedir file txt      This will create parent folders if do not exist and create a file if not exists and throw a exception if file object is a directory or cannot be written to  This is equivalent to   File file   new File   home nikhil somedir file txt    file getParentFile   mkdirs       Will create parent directories if not exists file createNewFile    FileOutputStream s   new FileOutputStream file false     All the above operations will throw an exception if the current user is not permitted to do the operation

[java] Java FileOutputStream Create File if not exists

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