Rename a file using Java

Question

Can we rename a file say test txt to test1 txt    If test1 txt exists will it rename     How do I rename it to the already existing test1 txt file so the new contents of test txt are added to it for later use

User · Answer

Copied from http   exampledepot 8waytrips com egs java io RenameFile html     File  or directory  with old name File file   new File  oldname        File  or directory  with new name File file2   new File  newname     if  file2 exists       throw new java io IOException  file exists        Rename file  or directory  boolean success   file renameTo file2    if   success          File was not successfully renamed     To append to the new file   java io FileWriter out  new java io FileWriter file2  true   append yes

User · Answer

Files move file toPath    fileNew toPath        works  but only when you close  or autoclose  ALL used resources  InputStream  FileOutputStream etc   I think the same situation with  file renameTo or FileUtils moveFile

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Running code is here   private static void renameFile File fileName         FileOutputStream fileOutputStream  null       BufferedReader br   null      FileReader fr   null       String newFileName    yourNewFileName       try           fileOutputStream   new FileOutputStream newFileName            fr   new FileReader fileName           br   new BufferedReader fr            String sCurrentLine           while   sCurrentLine   br readLine       null                fileOutputStream write    n  sCurrentLine  getBytes                        fileOutputStream flush          catch  IOException e            e printStackTrace          finally           try               fileOutputStream close                if  br    null                  br close                 if  fr    null                  fr close              catch  IOException ex                ex printStackTrace

User · Answer

Yes  you can use File renameTo    But remember to have the correct path while renaming it to a new file   import java util Arrays  import java util List   public class FileRenameUtility   public static void main String   a        System out println  FileRenameUtility        FileRenameUtility renameUtility   new FileRenameUtility        renameUtility fileRename  c  Temp       private void fileRename String folder       File file   new File folder       System out println  Reading this   file toString         if file isDirectory             File   files   file listFiles            List lt File gt  filelist   Arrays asList files           filelist forEach f- gt              if  f isDirectory    amp  amp  f getName   startsWith  Old                    System out println f getAbsolutePath                    String newName   f getAbsolutePath   replace  Old   New                   boolean isRenamed   f renameTo new File newName                   if isRenamed                     System out println String format  Renamed this file  s to   s  f getName   newName                   else                    System out println String format   s file is not renamed to  s  f getName   newName

User · Answer

As far as I know  renaming a file will not append its contents to that of an existing file with the target name   About renaming a file in Java  see the documentation for the renameTo   method in class File

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Here is my code to rename multiple files in a folder successfully   public static void renameAllFilesInFolder String folderPath  String newName  String extension        if newName    null    newName equals                System out println  New name cannot be null or empty            return            if extension    null    extension equals                System out println  Extension cannot be null or empty            return             File dir   new File folderPath        int i   1      if  dir isDirectory         make sure it s a directory         for  final File f   dir listFiles                  try                   File newfile   new File folderPath          newName         i         extension                    if f renameTo newfile                        System out println  Rename succesful      newName         i         extension                     else                       System out println  Rename failed                                      i                  catch  Exception e                    e printStackTrace                                       and run it for an example   renameAllFilesInFolder  E   Downloads  Foldername    my avatar    gif

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Renaming the file by moving it to a new name   FileUtils is from Apache Commons IO lib     String newFilePath   oldFile getAbsolutePath   replace oldFile getName          newName    File newFile   new File newFilePath      try       FileUtils moveFile oldFile  newFile       catch  IOException e        e printStackTrace

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You want to utilize the renameTo method on a File object   First  create a File object to represent the destination  Check to see if that file exists  If it doesn t exist  create a new File object for the file to be moved  call the renameTo method on the file to be moved  and check the returned value from renameTo to see if the call was successful   If you want to append the contents of one file to another  there are a number of writers available  Based on the extension  it sounds like it s plain text  so I would look at the FileWriter

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import java nio file Files  import java nio file Path  import java nio file Paths  import static java nio file StandardCopyOption     Path yourFile   Paths get  path to your file text txt     Files move yourFile  yourFile resolveSibling  text1 txt       To replace an existing file with the name  text1 txt        Files move yourFile  yourFile resolveSibling  text1 txt   REPLACE EXISTING

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Try This  File file new File  Your File    boolean renameResult   file renameTo new File  New Name        todo  check renameResult   Note    We should always check the renameTo return value to make sure rename file is successful because it   s platform dependent different Operating system  different file system  and it doesn   t throw IO exception if rename fails

User · Answer

If it s just renaming the file  you can use File renameTo     In the case where you want to append the contents of the second file to the first  take a look at FileOutputStream with the append constructor option or The same thing for FileWriter  You ll need to read the contents of the file to append and write them out using the output stream writer

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For Java 1 6 and lower  I believe the safest and cleanest API for this is Guava s Files move   Example   File newFile   new File oldFile getParent     new-file-name txt    Files move oldFile toPath    newFile toPath       The first line makes sure that the location of the new file is the same directory  i e  the  parent directory of the old file   EDIT  I wrote this before I started using Java 7  which introduced a very similar approach  So if you re using Java 7   you should see and upvote kr37 s answer

User · Answer

This is an easy way to rename a file           File oldfile  new File  test txt            File newfile  new File  test1 txt             if oldfile renameTo newfile                System out println  File renamed             else              System out println  Sorry  the file can t be renamed

User · Answer

In short  Files move source  source resolveSibling  quot newname quot      More detail  import java nio file Files  import java nio file Path  import java nio file Paths  import java nio file StandardCopyOption   The following is copied directly from http   docs oracle com javase 7 docs api index html  Suppose we want to rename a file to  quot newname quot   keeping the file in the same directory  Path source   Paths get  quot path here quot    Files move source  source resolveSibling  quot newname quot      Alternatively  suppose we want to move a file to new directory  keeping the same file name  and replacing any existing file of that name in the directory  Path source   Paths get  quot from path quot    Path newdir   Paths get  quot to path quot    Files move source  newdir resolve source getFileName     StandardCopyOption REPLACE EXISTING

[java] Rename a file using Java

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