Managed File with Command Line in Java IO

Create FileCommandLine Class

Create package files_directories and create new java class as below:

package files_directories;

import java.io.File;
import java.io.FileOutputStream;
import java.util.Scanner;

public class FileCommandLine {

	private File folder;

	public FileCommandLine() {
		folder = new File("c:\\");
	}

	public void run() {
		try {
			Scanner scanner = new Scanner(System.in);
			String key;
			do {
				System.out.print(folder.getAbsolutePath() + ">");
				String command = scanner.nextLine();
				if (getCommandName(command).equalsIgnoreCase("cd")) {
					// Example use this command line: cd c:\data
					changeFolder(command);
				} else if (getCommandName(command).equalsIgnoreCase("mkdir")) {
					// Example use this command line: mkdir abc
					createFolder(command);
				} else if (getCommandName(command).equalsIgnoreCase("mkfile")) {
					// Example use this command line: mkfile a.txt hello
					createFile(command);
				} else if (getCommandName(command).equalsIgnoreCase("delete")) {
					// Example use this command line: delete a.txt
					deleteFile(command);
				} else if (getCommandName(command).equalsIgnoreCase("rename")) {
					// Example use this command line: rename a.txt b.txt
					renameFile(command);
				} else if (getCommandName(command).equalsIgnoreCase("listFile")) {
					// Example use this command line: listFile
					listFile();
				} else if (getCommandName(command).equalsIgnoreCase("listFolder")) {
					// Example use this command line: listFolder
					listFolder();
				}
				System.out.print("Press Y(y) to continue ");
				key = scanner.nextLine();
			} while (key.equalsIgnoreCase("y"));
			System.out.println("Done");
			scanner.close();
		} catch (Exception ex) {
			System.out.println(ex.getMessage());
		}
	}

	private String getCommandName(String command) {
		return command.split(" ")[0];
	}

	private void changeFolder(String command) {
		String[] result = command.split(" ");
		folder = new File(result[1]);
		System.out.println(folder.getAbsolutePath() + ">");
	}

	private void listFolder() {
		try {
			for (File file : folder.listFiles()) {
				if (file.isDirectory()) {
					System.out.println("Folder Name: " + file.getName());
					System.out.println("====================");
				}
			}
		} catch (Exception e) {
			System.err.println(e.getMessage());
		}
	}

	private void listFile() {
		try {
			for (File file : folder.listFiles()) {
				System.out.println("File Name: " + file.getName());
				System.out.println("File Size(bytes): " + file.length());
				System.out.println("=========================");
			}
		} catch (Exception e) {
			System.err.println(e.getMessage());
		}
	}

	private void renameFile(String command) {
		try {
			String[] result = command.trim().split(" ");
			File file = new File(folder.getAbsolutePath() + "\\" + result[1]);
			if (!file.renameTo(new File(folder.getAbsolutePath() + "\\" + result[2]))) {
				throw new Exception();
			}
		} catch (Exception e) {
			System.err.println(e.getMessage());
		}
	}

	private void deleteFile(String command) {
		try {
			String[] result = command.trim().split(" ");
			File file = new File(folder.getAbsolutePath() + "\\" + result[1]);
			if (!file.delete()) {
				throw new Exception();
			}
		} catch (Exception e) {
			System.err.println(e.getMessage());
		}
	}

	private void createFile(String command) {
		try {
			String[] result = command.trim().split(" ");
			File file = new File(folder.getAbsolutePath() + "\\" + result[1]);
			if (file.createNewFile()) {
				FileOutputStream fileOutputStream = new FileOutputStream(file);
				fileOutputStream.write(result[2].getBytes());
				fileOutputStream.close();
			} else {
				throw new Exception();
			}
		} catch (Exception e) {
			System.err.println(e.getMessage());
		}
	}

	private void createFolder(String command) {
		try {
			String[] result = command.trim().split(" ");
			File file = new File(folder.getAbsolutePath() + "\\" + result[1]);
			file.mkdir();
		} catch (Exception e) {
			System.err.println(e.getMessage());
		}
	}

}

Run Application

package files_directories;

public class Main {

	public static void main(String[] args) {

		FileCommandLine fileCommandLine = new FileCommandLine();
		fileCommandLine.run();

	}

}

Output

Use command lines below run program:

Change Folder

Type cd [Path to folder is selected]

cd c:\data

Create New Folder

Type mkdir [Folder Name]

mkdir abc

Create New File

Type mkfile [File Name] [Content of File]

mkfile a.txt hello

Delete File

Type delete [File Name]

delete a.txt

Rename File

Type rename [Original File] [New File]

rename a.txt b.txt

List All File

listFile

List All Folder

listFolder