How do I get the file name from a String containing the Absolute file path

Question

String variable contains a file name  C  Hello AnotherFolder The File Name PDF  How do I only get the file name The File Name PDF as a String   I planned to split the string  but that is not the optimal solution

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Considere the case that Java is Multiplatform   int lastPath   fileName lastIndexOf File separator   if  lastPath  -1       fileName   fileName substring lastPath 1

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This answer works for me in c   using System IO  string fileName   Path GetFileName  quot C  Hello AnotherFolder The File Name PDF quot

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Using FilenameUtils in Apache Commons IO    String name1   FilenameUtils getName   ab cd xyz txt    String name2   FilenameUtils getName  c   ab  cd  xyz txt

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Since 1 7      Path p   Paths get  c   temp  1 txt        String fileName   p getFileName   toString        String directory   p getParent   toString

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Alternative using Path  Java 7     Path p   Paths get  C   Hello  AnotherFolder  The File Name PDF    String file   p getFileName   toString      Note that splitting the string on    is platform dependent as the file separator might vary  Path getName takes care of that issue for you

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you can use path   C  Hello AnotherFolder TheFileName PDF  String strPath   path substring path lastIndexOf       1  path length

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The other answers didn t quite work for my specific scenario  where I am reading paths that have originated from an OS different to my current one  To elaborate I am saving email attachments saved from a Windows platform on a Linux server  The filename returned from the JavaMail API is something like  C  temp hello xls   The solution I ended up with   String filenameWithPath    C   temp  hello xls   String   tokens   filenameWithPath split              String filename   tokens tokens length - 1

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extract file name using java regex     public String extractFileName String fullPathFile           try               Pattern regex   Pattern compile                lt  gt   r n                    Matcher regexMatcher   regex matcher fullPathFile               if  regexMatcher find                     return regexMatcher group 1                           catch  PatternSyntaxException ex                LOG info  extractFileName  pattern problem  lt   fullPathFile   gt   ex                     return fullPathFile

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A method without any dependency and takes care of        and duplicate separators   public static String getFileName String filePath        if  filePath  null    filePath length    0           return         filePath   filePath replaceAll                       int len   filePath length            upCount   0      while  len gt 0               remove trailing separator         if  filePath charAt len-1                       len--              if  len  0                   return                       int lastInd   filePath lastIndexOf      len-1           String fileName   filePath substring lastInd 1  len           if  fileName equals                      len--                    else if  fileName equals                       len -  2              upCount                      else               if  upCount  0                   return fileName              upCount--              len -  fileName length                        return         Test case    Test public void testGetFileName         assertEquals     getFileName            assertEquals     getFileName               assertEquals     getFileName    C                 assertEquals     getFileName  C                 assertEquals  C   getFileName  C         assertEquals  C   getFileName   C         assertEquals  C   getFileName   C          assertEquals  C   getFileName    C           assertEquals  C   getFileName   A B C          assertEquals  C   getFileName   A B C         assertEquals  C   getFileName   C   B             assertEquals  C   getFileName    C    B                assertEquals  user   getFileName   user java            assertEquals  C    getFileName  C          assertEquals  C    getFileName   C          assertEquals  java   getFileName  C   Program Files  x86   java  bin             assertEquals  C ext   getFileName   A B C ext         assertEquals  C ext   getFileName  C ext         Maybe getFileName is a bit confusing  because it returns directory names also  It returns the name of file or last directory in a path

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You can use FileInfo object to get all information of your file       FileInfo f   new FileInfo   C  Hello AnotherFolder The File Name PDF        MessageBox Show f Name       MessageBox Show f FullName       MessageBox Show f Extension        MessageBox Show f DirectoryName

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getFileName   method of java nio file Path used to return the name of the file or directory pointed by this path object   Path getFileName    For reference   https   www geeksforgeeks org path-getfilename-method-in-java-with-examples

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just use File getName    File f   new File  C   Hello  AnotherFolder  The File Name PDF    System out println f getName       using String methods     File f   new File  C   Hello  AnotherFolder  The File Name PDF      System out println f getAbsolutePath   substring f getAbsolutePath   lastIndexOf       1

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Considering the String you re asking about is   C  Hello AnotherFolder The File Name PDF   we need to extract everything after the last separator  ie     That is what we are interested in    You can do   String fullPath    C   Hello  AnotherFolder  The File Name PDF   int index   fullPath lastIndexOf        String fileName   fullPath substring index   1     This will retrieve the index of the last   in your String and extract everything that comes after it into fileName    If you have a String with a different separator  adjust the lastIndexOf to use that separator   There s even an overload that accepts an entire String as a separator    I ve omitted it in the example above  but if you re unsure where the String comes from or what it might contain  you ll want to validate that the lastIndexOf returns a non-negative value because the Javadoc states it ll return      -1 if there is no such occurrence

[java] How do I get the file name from a String containing the Absolute file path?

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