Printing the directory treeFrom WikiJavabuy this book
This example is a full program that reads the directory structure and prints it formatted on the standard output. I've actually created this program for showing the directory structures in the tutorials on WikiJava :D
the articleThe program expects to be executed with one parameter, representing the starting directory from which build the directory tree. If no parameters are passed the current directory is used. The core of the program is the method; private static StringBuffer exploreDirectory(File directory, int level) that recursively explores all the subdirectories and prints them along with the files contained in each directory. fileTree.java
/** * */ package org.wikijava.utils.fileTree; import java.io.File; import java.util.Arrays; import java.util.List; /** * generates a visual ascii representation of a directory tree * * @author Giulio */ public class FileTree { private static final String USAGE = "usage \n fileTree <directory name>"; //$NON-NLS-1$ private static final String NEWLINE = "\n"; //$NON-NLS-1$ private static final String FILE_GRAPHIC = "- "; //$NON-NLS-1$ private static final String DIRECTORY_GRAPHIC = "+- "; //$NON-NLS-1$ private static final String CURRENT_PATH = "."; //$NON-NLS-1$ /** * * @param args */ public static void main(String[] args) { // parameters check if (args.length > 1) { System.err.println(USAGE); return; } // assign parameters File directory = null; if (args.length == 1) { String baseDir = args[0]; directory = new File(baseDir); } else { directory = new File(CURRENT_PATH); } if (!directory.isDirectory()){ System.err.println(USAGE); return; } StringBuffer stringBuffer = exploreDirectory(directory, 0); System.out.println(stringBuffer); } /** * * explores the directory tree * * @param directory * the directory to start with * @param level * the level of indentation * @return a String ascii representation of the directory Structure */ private static StringBuffer exploreDirectory(File directory, int level) { List<File> files = Arrays.asList(directory.listFiles()); StringBuffer result = new StringBuffer(); // creates the spacing StringBuffer spaces = new StringBuffer(); for (int i = 0; i < level; i++) { spaces.append(" "); //$NON-NLS-1$ } // explores the directories for (File cur : files) { if (cur.isDirectory()) { result.append(spaces + DIRECTORY_GRAPHIC + cur.getName() + NEWLINE); result.append(exploreDirectory(cur, level + DIRECTORY_GRAPHIC.length() - 2)); } } // outputs the files for (File cur : files) { if (cur.isFile()) { result.append(spaces + FILE_GRAPHIC + cur.getName() + NEWLINE); } } return result; } } |
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