Java file Inputstream

Set last modified time of a file or directory

import java.io.*;

import java.util.Date; 

public class SetFileLastModifiedTime

{

public static void main(String[] args)

{

File file = new File("C://FileIO//ReadText.txt");

Date lastModified = new Date(file.lastModified());

System.out.println("Last modified time of file is : " + lastModified );

lastModified = new Date();

boolean blnSuccess = file.setLastModified(lastModified.getTime());

System.out.println("Was last modified time set successfully ?:" + blnSuccess);

System.out.println("File last modification date is : " +

new Date(file.lastModified()));

   }

}

Read file using File Input Stream

import java.io.*;

public class ReadStringFromFile

{

 public static void main(String[] args)

{

 File file = new File("C://FileIO//ReadString.txt");

 int ch;

 StringBuffer strContent = new StringBuffer("");

 FileInputStream fin = null;

 try

fin = new FileInputStream(file);

while( (ch = fin.read()) != -1)

strContent.append((char)ch);

fin.close();    

}

catch(FileNotFoundException e)

{

System.out.println("File " + file.getAbsolutePath() +

" could not be found on filesystem");

}

catch(IOException ioe)

{

System.out.println("Exception while reading the file" + ioe);

} 

System.out.println("File contents :");

System.out.println(strContent);

   }

}

Skip n bytes while reading the file using File Input Stream

import java.io.*;

public class SkipBytesReadFile

{

public static void main(String[] args)

{

File file = new File("C://FileIO//ReadString.txt");

try

{

FileInputStream fin = new FileInputStream(file);

int ch;

fin.skip(10);

while( (ch = fin.read()) != -1 )

System.out.print((char) ch);

}

catch(FileNotFoundException e)

{

System.out.println("File not found" + e);

}

catch(IOException ioe)

{

System.out.println("Exception while reading the file " + ioe);

     }

  }

}

Read file in byte array using File Input Stream

import java.io.*;

public class ReadFileByteArray

{

public static void main(String[] args)

{

File file = new File("C://FileIO//ReadString.txt");

try

{

FileInputStream fin = new FileInputStream(file);

byte fileContent[] = new byte[(int)file.length()];

fin.read(fileContent);

String strFileContent = new String(fileContent);

System.out.println("File content : ");

System.out.println(strFileContent);

}

catch(FileNotFoundException e)

{

System.out.println("File not found" + e);

}

catch(IOException ioe)

{

System.out.println("Exception while reading the file " + ioe);

   }

  }

}

Copy binary file using Streams

import java.io.FileNotFoundException;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

public class CopyBinaryFile

{

 public static void main(String[] args)

{

String strSourceFile="C:/FileIO/source.dat";

String strDestinationFile="C:/FileIO/dest.dat";

try

{

FileInputStream fin = new FileInputStream(strSourceFile);

FileOutputStream fout = new FileOutputStream(strDestinationFile);

byte[] b = new byte[1024];

int noOfBytes = 0;                     

System.out.println("Copying file using streams");

while( (noOfBytes = fin.read(b)) != -1 )

{

fout.write(b, 0, noOfBytes);

}

System.out.println("File copied!");

fin.close();

fout.close();                  

}

catch(FileNotFoundException fnf)

{

System.out.println("Specified file not found :" + fnf);

}

catch(IOException ioe)

{

System.out.println("Error while copying file :" + ioe);

    }

  }

}