How to convert FileInputStream to InputStream

Question

I just want to convert a FileInputStream to an InputStream  how can I do that   e g   FileInputStream fis   new FileInputStream  c   filename    InputStream is       fis close

User · Answer

InputStream is   new FileInputStream  c   filename    return is

User · Answer

You would typically first read from the input stream and then close it  You can wrap the FileInputStream in another InputStream  or Reader   It will be automatically closed when you close the wrapping stream reader   If this is a method returning an InputStream to the caller  then it is the caller s responsibility to close the stream when finished with it  If you close it in your method  the caller will not be able to use it   To answer some of your comments     To send the contents InputStream to a remote consumer  you would write the content of the InputStream to an OutputStream  and then close both streams   The remote consumer does not know anything about the stream objects you have created  He just receives the content  in an InputStream which he will create  read from and close

User · Answer

InputStream is   try       is   new FileInputStream  c   filename         is close       catch  FileNotFoundException e           TODO Auto-generated catch block     e printStackTrace      catch  IOException e           TODO Auto-generated catch block     e printStackTrace       return is

User · Answer

If you wrap one stream into another  you don t close intermediate streams  and very important  You don t close them before finishing using the outer streams  Because you would close the outer stream too

User · Answer

FileInputStream is an inputStream   FileInputStream fis   new FileInputStream  c   filename    InputStream is   fis  fis close      return is    Of course  this will not do what you want it to do   the stream you return has already been closed   Just return the FileInputStream and be done with it   The calling code should close it

[java] How to convert FileInputStream to InputStream?

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