In JDK7, "more NIO features" should have methods to apply the visitor pattern over a file tree or just the immediate contents of a directory - no need to find all the files in a potentially huge directory before iterating over them.
Check out Apache Commons FileUtils (listFiles, iterateFiles, etc.). Nice convenience methods for doing what you want and also applying filters.
http://commons.apache.org/io/api-1.4/org/apache/commons/io/FileUtils.html
You can also use the FileFilter
interface to filter out what you want. It is best used when you create an anonymous class that implements it:
import java.io.File;
import java.io.FileFilter;
public class ListFiles {
public File[] findDirectories(File root) {
return root.listFiles(new FileFilter() {
public boolean accept(File f) {
return f.isDirectory();
}});
}
public File[] findFiles(File root) {
return root.listFiles(new FileFilter() {
public boolean accept(File f) {
return f.isFile();
}});
}
}
Check out Apache Commons FileUtils (listFiles, iterateFiles, etc.). Nice convenience methods for doing what you want and also applying filters.
http://commons.apache.org/io/api-1.4/org/apache/commons/io/FileUtils.html
public static void directory(File dir) {
File[] files = dir.listFiles();
for (File file : files) {
System.out.println(file.getAbsolutePath());
if (file.listFiles() != null)
directory(file);
}
}
Here dir
is Directory to be scanned. e.g. c:\
import java.io.File;
public class Test {
public static void main( String [] args ) {
File actual = new File(".");
for( File f : actual.listFiles()){
System.out.println( f.getName() );
}
}
}
It displays indistinctly files and folders.
See the methods in File class to order them or avoid directory print etc.
Visualizing the tree structure was the most convenient way for me :
public static void main(String[] args) throws IOException {
printTree(0, new File("START/FROM/DIR"));
}
static void printTree(int depth, File file) throws IOException {
StringBuilder indent = new StringBuilder();
String name = file.getName();
for (int i = 0; i < depth; i++) {
indent.append(".");
}
//Pretty print for directories
if (file.isDirectory()) {
System.out.println(indent.toString() + "|");
if(isPrintName(name)){
System.out.println(indent.toString() + "*" + file.getName() + "*");
}
}
//Print file name
else if(isPrintName(name)) {
System.out.println(indent.toString() + file.getName());
}
//Recurse children
if (file.isDirectory()) {
File[] files = file.listFiles();
for (int i = 0; i < files.length; i++){
printTree(depth + 4, files[i]);
}
}
}
//Exclude some file names
static boolean isPrintName(String name){
if (name.charAt(0) == '.') {
return false;
}
if (name.contains("svn")) {
return false;
}
//.
//. Some more exclusions
//.
return true;
}
import java.io.File;
public class Test {
public static void main( String [] args ) {
File actual = new File(".");
for( File f : actual.listFiles()){
System.out.println( f.getName() );
}
}
}
It displays indistinctly files and folders.
See the methods in File class to order them or avoid directory print etc.
In JDK7, "more NIO features" should have methods to apply the visitor pattern over a file tree or just the immediate contents of a directory - no need to find all the files in a potentially huge directory before iterating over them.
Check out Apache Commons FileUtils (listFiles, iterateFiles, etc.). Nice convenience methods for doing what you want and also applying filters.
http://commons.apache.org/io/api-1.4/org/apache/commons/io/FileUtils.html
You can also use the FileFilter
interface to filter out what you want. It is best used when you create an anonymous class that implements it:
import java.io.File;
import java.io.FileFilter;
public class ListFiles {
public File[] findDirectories(File root) {
return root.listFiles(new FileFilter() {
public boolean accept(File f) {
return f.isDirectory();
}});
}
public File[] findFiles(File root) {
return root.listFiles(new FileFilter() {
public boolean accept(File f) {
return f.isFile();
}});
}
}
Visualizing the tree structure was the most convenient way for me :
public static void main(String[] args) throws IOException {
printTree(0, new File("START/FROM/DIR"));
}
static void printTree(int depth, File file) throws IOException {
StringBuilder indent = new StringBuilder();
String name = file.getName();
for (int i = 0; i < depth; i++) {
indent.append(".");
}
//Pretty print for directories
if (file.isDirectory()) {
System.out.println(indent.toString() + "|");
if(isPrintName(name)){
System.out.println(indent.toString() + "*" + file.getName() + "*");
}
}
//Print file name
else if(isPrintName(name)) {
System.out.println(indent.toString() + file.getName());
}
//Recurse children
if (file.isDirectory()) {
File[] files = file.listFiles();
for (int i = 0; i < files.length; i++){
printTree(depth + 4, files[i]);
}
}
}
//Exclude some file names
static boolean isPrintName(String name){
if (name.charAt(0) == '.') {
return false;
}
if (name.contains("svn")) {
return false;
}
//.
//. Some more exclusions
//.
return true;
}
Check out Apache Commons FileUtils (listFiles, iterateFiles, etc.). Nice convenience methods for doing what you want and also applying filters.
http://commons.apache.org/io/api-1.4/org/apache/commons/io/FileUtils.html
You can also use the FileFilter
interface to filter out what you want. It is best used when you create an anonymous class that implements it:
import java.io.File;
import java.io.FileFilter;
public class ListFiles {
public File[] findDirectories(File root) {
return root.listFiles(new FileFilter() {
public boolean accept(File f) {
return f.isDirectory();
}});
}
public File[] findFiles(File root) {
return root.listFiles(new FileFilter() {
public boolean accept(File f) {
return f.isFile();
}});
}
}
In JDK7, "more NIO features" should have methods to apply the visitor pattern over a file tree or just the immediate contents of a directory - no need to find all the files in a potentially huge directory before iterating over them.
import java.io.File;
public class Test {
public static void main( String [] args ) {
File actual = new File(".");
for( File f : actual.listFiles()){
System.out.println( f.getName() );
}
}
}
It displays indistinctly files and folders.
See the methods in File class to order them or avoid directory print etc.
You can also use the FileFilter
interface to filter out what you want. It is best used when you create an anonymous class that implements it:
import java.io.File;
import java.io.FileFilter;
public class ListFiles {
public File[] findDirectories(File root) {
return root.listFiles(new FileFilter() {
public boolean accept(File f) {
return f.isDirectory();
}});
}
public File[] findFiles(File root) {
return root.listFiles(new FileFilter() {
public boolean accept(File f) {
return f.isFile();
}});
}
}
Source: Stackoverflow.com