Archives: File IO

Android – Check if File Exists in Internal and External Storage

December 15, 2014 | By Prasanna Sherekar | Post comment

Check if File Exists in Internal and External Storage – Android and Java Example

— Check if File Exists in Android Internal Storage

public boolean fileExists(Context context, String filename) {
 File file = context.getFileStreamPath(filename);
 if (file != null && file.exists()) {
  return true;
 }
 return false;
}

public boolean fileExists(Context context, String filename) {

File file = context.getFileStreamPath(filename);

if (file != null && file.exists()) {

return true;

}

return false;

}

— Check if File Exists in Android External Storage

public boolean fileExists() {
 String fileName = "/appname/data.xml";
 String filePath = Environment.getExternalStorageDirectory().getPath() + fileName;
 File file = new File(filePath);
 return file.exists();
}

public boolean fileExists() {

String fileName = "/appname/data.xml";

String filePath = Environment.getExternalStorageDirectory().getPath() + fileName;

File file = new File(filePath);

return file.exists();

}

Java – Calculate Directory Size using Commons FileUtils

August 10, 2010 | By Prasanna Sherekar | Post comment

import java.io.File;
import org.apache.commons.io.FileUtils;

public class DirectorySizeSample {

    public static void main(String[] args) {

        // Using FileUtils.sizeOfDirectory() we can calculate
        // the size of a directory including it sub directory
        long size = FileUtils.sizeOfDirectory(new File("C:/Windows"));

        System.out.println("Size: " + size + " bytes");

    }
}

import java.io.File;

import org.apache.commons.io.FileUtils;

public class DirectorySizeSample {

public static void main(String[] args) {

// Using FileUtils.sizeOfDirectory() we can calculate

// the size of a directory including it sub directory

long size = FileUtils.sizeOfDirectory(new File("C:/Windows"));

System.out.println("Size: " + size + " bytes");

}

Java – Create File Object from URL using Commons FileUtils

July 15, 2010 | By Prasanna Sherekar | Post comment

import org.apache.commons.io.FileUtils;

import java.io.File;
import java.net.URL;

public class URLToFile {

    public static void main(String[] args) throws Exception {
        //
        // FileUtils.toFile(URL url) convert from URL the File.
        //
        String data = FileUtils.readFileToString(FileUtils.toFile(
            URLToFile.class.getResource("/data.txt")));
        System.out.println("data = " + data);

        //
        // Creates a URL with file protocol and convert it into File
        // object.
        //
        File file = FileUtils.toFile(new URL("file://D:/demo.txt"));
        data = FileUtils.readFileToString(file);
        System.out.println("data = " + data);
    }

}

import org.apache.commons.io.FileUtils;

import java.io.File;

import java.net.URL;

public class URLToFile {

public static void main(String[] args) throws Exception {

// FileUtils.toFile(URL url) convert from URL the File.

String data = FileUtils.readFileToString(FileUtils.toFile(

URLToFile.class.getResource("/data.txt")));

System.out.println("data = " + data);

// Creates a URL with file protocol and convert it into File

// object.

File file = FileUtils.toFile(new URL("file://D:/demo.txt"));

data = FileUtils.readFileToString(file);

System.out.println("data = " + data);

}