How to make FileFilter in java

Question

like in title how to make filter to  txt files   i wrote something like this but it has error      private void jMenuItem1ActionPerformed java awt event ActionEvent evt                                                       JFileChooser chooser   new JFileChooser            int retval   chooser showOpenDialog null            String yourpath    E   Programy Java  Projekt SR1  src  project sr1           File directory   new File yourpath           String   myFiles          FilenameFilter filter   new FilenameFilter             public boolean accept File directory  String fileName                return fileName endsWith   txt                                 myFiles   directory list filter             if retval    JFileChooser APPROVE OPTION                        File myFile   chooser getSelectedFile

User · Answer

Since Java7 you can simply use FileNameExtensionFilter String description  String    extensions   A simple JFileChooser analog to the example would be   JFileChooser fileChooser   new JFileChooser    fileChooser setFileFilter new FileNameExtensionFilter  Text files    txt       I know the question was answered long ago  but this is actually the simplest solution

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Another simple example   public static void listFilesInDirectory String pathString         A local class  a class defined inside a block  here a method     class MyFilter implements FileFilter        Override     public boolean accept File file          return  file isHidden    amp  amp  file getName   endsWith   txt                 File directory   new File pathString     File   files   directory listFiles new MyFilter        for  File fileLoop   files        System out println fileLoop getName               Call it listFilesInDirectory  C   Users  John  Documents  zTemp        Output Cool txt RedditKinsey txt

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From JDK8 on words it is as simple as   final String extension     java   final File currentDir   new File YOUR DIRECTORY PATH   File   files   currentDir listFiles  File pathname  - gt  pathname getName   endsWith extension

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Here you will find some working examples  This is also a good example of FileFilter used in JFileChooser   The basics are  you need to override FileFilter class and write your custom code in its accpet method  The accept method in above example is doing filtration based on file types   public boolean accept File file        if  file isDirectory            return true        else         String path   file getAbsolutePath   toLowerCase          for  int i   0  n   extensions length  i  lt  n  i              String extension   extensions i           if   path endsWith extension   amp  amp   path charAt path length                      - extension length   - 1                        return true                              return false      Or more simpler to use is FileNameFilter which has accept method with filename as argument  so you don t need to get it manually

User · Answer

File f   null  File   paths   try        f   new File dir           filefilter     FilenameFilter fileNameFilter   new FilenameFilter              public boolean accept File dir  String name                 if  name lastIndexOf       gt  0                     int lastIndex   name lastIndexOf                       String str   name substring lastIndex                    if  str equals       selectlogtype                         return true                                              return false                        paths   f listFiles fileNameFilter        for  int i   0  i  lt  paths length  i              try                FileWriter fileWriter   new FileWriter  C  Users maya02 workspace ftp log filefilterlogtxt                PrintWriter bWriter   new PrintWriter fileWriter                for  File writerpath1   paths                    bWriter println writerpath1                              bWriter close                       catch  IOException e    System out println  HATA                  System out println  path dosyaya aktarildi         catch  Exception e

User · Answer

You are going wrong here   int retval   chooser showOpenDialog null    public boolean accept File directory  String fileName     return fileName endsWith   txt         You first show the file chooser dialog and then apply the filter  This wont work  First apply the filter and then show the dialog   public boolean accept File directory  String fileName            return fileName endsWith   txt      int retval   chooser showOpenDialog null

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Here is a little utility class that I created   import java io File  import java io FilenameFilter  import java util HashSet  import java util Iterator  import java util Set          Convenience utility to create a FilenameFilter  based on a list of extensions     public class FileExtensionFilter implements FilenameFilter       private Set lt String gt  exts   new HashSet lt String gt                      param extensions                   a list of allowed extensions  without the dot  e g                     lt code gt  xml   html   rss  lt  code gt              public FileExtensionFilter String    extensions            for  String ext   extensions                exts add       ext toLowerCase   trim                          public boolean accept File dir  String name            final Iterator lt String gt  extList   exts iterator            while  extList hasNext                  if  name toLowerCase   endsWith extList next                       return true                                  return false            Usage           String   files   new File  myfile   list new FileExtensionFilter  pdf    zip

User · Answer

Try something like this     String yourPath    insert here your path     File directory   new File yourPath   String   myFiles   directory list new FilenameFilter         public boolean accept File directory  String fileName            return fileName endsWith   txt

User · Answer

What about using Apache s FileFilters from  org apache commons io   just like    import org apache commons io filefilter FileFileFilter   import org apache commons io filefilter WildcardFileFilter          File dir   new File         String   filters        txt     IOFileFilter wildCardFilter   new WildcardFileFilter filters  IOCase INSENSITIVE     String   files   dir list  wildCardFilter     for   int i   0  i  lt  files length  i            System out println files i

[java] How to make FileFilter in java?

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