Java Folder Read getFilesAndFilesSubDirectories(String directoryName, String regexPattern)

Description

get Files And Files Sub Directories

License

LGPL

Parameter

Parameter	Description
directoryName	a parameter
regexPattern	a parameter

Declaration

private static List<File> getFilesAndFilesSubDirectories(String directoryName, String regexPattern) 

Method Source Code

//package com.java2s;
//License from project: LGPL 

import java.io.File;
import java.util.ArrayList;
import java.util.List;

public class Main {
    public static final String allFilterRegex = ".*";

    /**/*from   w  w w  . j  ava  2  s  .c o  m*/
     *
     * @param directoryName
     * @param regexPattern
     * @return
     */
    private static List<File> getFilesAndFilesSubDirectories(String directoryName, String regexPattern) {

        File directory = new File(directoryName);

        //get all the files from a directory
        File[] fList = directory.listFiles();
        List<File> fileList = new ArrayList<File>();
        if (fList == null) {
            return fileList;
        }
        for (File file : fList) {
            if (!file.getName().matches(regexPattern)) {
                continue;
            }
            fileList.add(file);
            if (file.isDirectory()) {
                getFilesAndFilesSubDirectories(file.getAbsolutePath(), regexPattern);
            }
        }
        return fileList;
    }

    /**
     * list folders and file by String pattern
     * example directoryName= /home/MyUser/Dekstop/myfiles/
     * pattern=*
     * @param directoryName to be listed
     */
    public static List<File> listFiles(String directoryName) {
        return listFilesByRegex(directoryName, allFilterRegex);
    }

    /**
     *
     * @param directoryName
     * @param pattern
     * @return
     */
    public static List<File> listFiles(String directoryName, String pattern) {
        String regexPattern = pattern == null ? allFilterRegex : pattern.replace(".", "\\.").replace("*", ".*");
        return listFilesByRegex(directoryName, regexPattern);
    }

    /**
     *  list  files by regex Pattern
     * example directoryName= /home/MyUser/Dekstop/myfiles/
     * example pattern =/.*.json/
     *
     * @param directoryName
     * @param regexPattern
     * @return
     */
    public static List<File> listFilesByRegex(String directoryName, String regexPattern) {

        File directory = new File(directoryName);

        //get all the files from a directory
        File[] fList = directory.listFiles();
        List<File> fileList = new ArrayList<File>();
        if (fList == null) {
            return fileList;
        }

        for (File file : fList) {
            if (file.isFile() && file.getName().matches(regexPattern)) {
                fileList.add(file);
            }
        }
        return fileList;
    }
}

Related

1. getFiles(String path, String endian)
2. getFiles(String paths)
3. getFiles(String realpath, List files, String[] fileType)
4. getFiles(String rootDirectory)
5. getFiles(String thePaths[])
6. getFilesArray(File baseStorePath, final String fileNameSearchPattern)
7. getFilesAsArrayList(String path)
8. getFilesByDate(String directory, final boolean earliestFirst)
9. getFilesByName(File path, String name)