Converting Java file URL to File path platform independent including UNC paths

Question

I am developing a platform independent application  I am receiving a file URL   On windows these are    file    Z  folder 20to 20file file txt file   host folder 20to 20file file txt  an UNC path    I am using new File URI urlOfDocument  getPath   which works fine with the first one and also on Unix  Linux  OS X  but does not work with UNC paths   What is the standard way to convert file  URLs to File     paths  being compatible with Java 6             Note  I am receiving theses URLs from OpenOffice   LibreOffice  XModel getURL

User · Answer

For Java 8 the following method works    Form an URI from file URI string Create a file from the URI  not directly from URI string  absolute URI string are not paths    Refer  below code snippet      String fileURiString  file    D  etc MySQL txt       URI fileURI new URI fileURiString       File file new File fileURI    File file new File fileURiString  - will generate exception      FileInputStream fis new FileInputStream file       fis close

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I hope  not exactly verified  that newer java brought nio package and Path  Hopefully it have it fixed          String s  C   some  ile txt           System out println new File s  toPath   toUri

User · Answer

Java  at least 5 and 6  java 7 Paths solved most  has a problem with UNC and URI  Eclipse team wrapped it up here   http   wiki eclipse org Eclipse UNC Paths   From java io File javadocs  the UNC prefix is         and java net URI handles file     host path  four slashes    More details on why this happens and possible problems it causes in other URI and URL methods can be found in the list of bugs at the end of the link given above   Using these informations  Eclipse team developed org eclipse core runtime URIUtil class  which source code can probably help out when dealing with UNC paths

User · Answer

Based on the hint and link provided in Simone Giannis answer  this is my hack to fix this   I am testing on uri getAuthority    because UNC path will report an Authority  This is a bug - so I rely on the existence of a bug  which is evil  but it apears as if this will stay forever  since Java 7 solves the problem in java nio Paths    Note  In my context I will receive absolute paths  I have tested this on Windows and OS X    Still looking for a better way to do it   package com christianfries test   import java io File  import java net MalformedURLException  import java net URI  import java net URISyntaxException  import java net URL   public class UNCPathTest        public static void main String   args  throws MalformedURLException  URISyntaxException           UNCPathTest upt   new UNCPathTest             upt testURL  file   server dir file txt        Windows UNC Path          upt testURL  file    Z  dir file txt           Windows drive letter path          upt testURL  file    dir file txt              Unix  absolute  path            private void testURL String urlString  throws MalformedURLException  URISyntaxException           URL url   new URL urlString           System out println  URL is      url toString              URI uri   url toURI            System out println  URI is      uri toString              if uri getAuthority      null  amp  amp  uri getAuthority   length    gt  0                   Hack for UNC Path             uri    new URL  file       urlString substring  file   length      toURI                       File file   new File uri           System out println  File is      file toString              String parent   file getParent            System out println  Parent is      parent            System out println

User · Answer

Building on  SotiriosDelimanolis s comment  here is a method to deal with URLs  such as file      and non-URLs  such as C       using Spring s FileSystemResource   public FileSystemResource get String file        try              First try to resolve as URL  file              Path path   Paths get new URL file  toURI             FileSystemResource resource   new FileSystemResource path toFile             return resource        catch  URISyntaxException   MalformedURLException e               If given file string isn t an URL  fall back to using a normal file          return new FileSystemResource file

[java] Converting Java file:// URL to File(...) path, platform independent, including UNC paths

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