How to remove the error when launching a gallp file?

Question

gulp.js

(styles are not compiled now)
although everything worked for another 10 minutes

Answer 1

Traverse subfolders recursively. The list of files can be obtained using the listFiles method , which can be passed a FilenameFilter

Answer 2

You can use ready made. There is a series of libraries from Apache with a bunch of ready-made solutions, here is one of them

<dependency>
  <groupId>commons-io</groupId>
  <artifactId>commons-io</artifactId>
  <version>2.4</version>
</dependency>

import java.io.File;
import java.util.Collection;

import org.apache.commons.io.FileUtils;

public class Test {

  public static void main(String[] args) {
    Collection<File> files = FileUtils.listFiles(new File("/home/user/workspace"), new String[] {"java"}, true);
    
    for (File file : files) {
      System.out.println(file);
    }
  }
}

Answer 3

Here is the text of a static subroutine from its own Files class (common file operations, name collection was not required), which erases all the contents of a given directory. Incl. and recursively (by parameter). Which requires erasing all files in all nested directories. It is not difficult to recycle in the right direction by adding an option to collect the names of detected files and fill it in the desired format:

/**
   * Tries to remove all files (and sub-directories optionally) in the designated
   * directory
   *
   * @param dir_path  directory path to clear from other files and optionally
   *                  directories
   * @param recursive deletes sub-dirs also if set to {@code true}
   * @return {@code true} if operation completed successfully that is no errors
   *         occurs during operation, else {@code false}
   */
  public static boolean clearDirectory( String dir_path, boolean recursive )
  {
    File dir = new File( dir_path );
    if ( !dir.isDirectory() )
    {
      return false;
    }
    boolean res = true;
    String[] files = dir.list();
    String fdir = Files.resetDir( dir_path );
    String fpath;
    StringBuffer sb = new StringBuffer();
    for ( int i = 0; i < files.length; i++ )
    {
      sb.delete( 0, Integer.MAX_VALUE ).append( fdir ).append( files[ i ] );
      File file = new File( fpath = sb.toString() );
      if ( file.isDirectory() && recursive )
      {
        res = clearDirectory( fpath, recursive );
      }
      else
      {
        try
        {
          res = file.delete();  // TODO: здесь забирать конкретное имя фала в общий выходной массив
        }
        catch ( SecurityException se )
        {
        }
      }
    }
    return res;
  }

The additional code to be called is below:

/**
   * The system-dependent default name-separator character. This field is
   * initialised to contain the first character of the value of the system
   * property file.separator. On UNIX systems the value of this field is '/'; on
   * Microsoft Windows systems it is '\\'.
   */
  public static final char FileSeparator = File.separatorChar;

  /**
   * The system-dependent default name-separator character. This field is
   * initialised to contain the first character of the value of the system
   * property file.separator. On UNIX systems the value of this field is '/'; on
   * Microsoft Windows systems it is '\\'.
   */
  public static final char FS = File.separatorChar;

  /**
   * appends system dependent file separator char
   *
   * @param FilePath - string to check for file separator existence
   * @return new string with appended file separator or the same string if it
   *         already was present
   */
  public static String appendFileSeparator( String FilePath )
  {
    return appendFileSeparator( FilePath, FileSeparator );
  }

  /**
   * appends system dependent file separator char
   *
   * @param FilePath - string to check for file separator existence
   * @param sep      character to be a last separator in the input string
   * @return new string with appended file separator or the same string if it
   *         already was present
   */
  public static String appendFileSeparator( String FilePath, char sep )
  {
    if ( Text.isEmpty( FilePath ) )
    {
      return "" + sep;
    }
    char ch = FilePath.charAt( FilePath.length() - 1 );// get last symbol
    if ( ( ch != '/' ) && ( ch != '\\' ) )// check it to be a separator one
    {
      return FilePath + sep;
    }
    else
    {
      return FilePath.substring( 0, FilePath.length() - 1 ) + sep;
    }
  }


  /**
   * the same as {@link #appendFileSeparator} but with shorter name :o)
   *
   * @param path path to append file separator
   * @return path with trailing current file names separator
   */
  public static String resetDir( String path )
  {
    if ( path == null )
    {
      return null;
    }
    return appendFileSeparator( path );
  }