Filter the files and read property file and content line by line in Java

How to filter the files by file extensions and show the file names

package com.java2novice.files;

import java.io.File;

import java.io.FilenameFilter;

public class MyFileFilter

{

public static void main(String a[])

{

        File file = new File("C:/MyFolder/");

        String[] files = file.list(new FilenameFilter()

{

 public boolean accept(File dir, String name)

{

                if(name.toLowerCase().endsWith(".csv"))

               {

                    return true;

                }

                else

             {

                    return false;

                }

            }

        });

        for(String f:files)

        {

            System.out.println(f);

        }

    }

}

How to read file content using byte array

package com.java2novice.files;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.InputStream;

public class FileToByteArray

{

 public static void main(String a[])

{

        String fileName = "C:/MyFile.txt";

        InputStream is = null;

        try

      {

            is = new FileInputStream(fileName);

            byte content[] = new byte[2*1024];

            int readCount = 0;

            while((readCount = is.read(content)) > 0)

            {

                System.out.println(new String(content, 0, readCount-1));

            }

        }

        catch (FileNotFoundException e)

        {

            e.printStackTrace();

        }

        catch (IOException e)

         {

            e.printStackTrace();

        }

        finally

       {

            try

            {

                if(is != null) is.close();

            }

            catch(Exception ex){}

        }

    }

}

How to read file content line by line in java

 

package com.java2novice.files;

import java.io.BufferedReader;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.IOException;

public class ReadLinesFromFile

{

public static void main(String a[])

{

        BufferedReader br = null;

        String strLine = "";

        try

       {

            br = new BufferedReader( new FileReader("fileName"));

            while( (strLine = br.readLine()) != null)

           {

                System.out.println(strLine);

            }

        }

         catch (FileNotFoundException e)

         {

            System.err.println("Unable to find the file: fileName");

        }

           catch (IOException e)

       {

            System.err.println("Unable to read the file: fileName");

        }

    }

}

How to read property file in static context

package com.java2novice.files;

import java.io.IOException;

import java.io.InputStream;

import java.util.Properties;

public class ClassLoaderFileLoading

{

 private static Properties appProp = null;

 static

{

        try

        {

            InputStream is =

                ClassLoaderFileLoading.class.getResourceAsStream("/FileName.properties");

            appProp = new Properties();

            appProp.load(is);

        }

        catch(IOException ex)

        {

            ex.printStackTrace();

         }

         catch(Exception ex)

         {

            ex.printStackTrace();

        }

    }

}