Java Data input stream

Read int from file using Data Input Stream

import java.io.DataInputStream;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

public class ReadIntFromFile

{

public static void main(String[] args)

{

String strFilePath = "C://FileIO//readInt.txt";

try

{

FileInputStream fin = new FileInputStream(strFilePath);

DataInputStream din = new DataInputStream(fin);

int i = din.readInt();

System.out.println("int : " + i);

din.close();

}

catch(FileNotFoundException fe)

{

System.out.println("FileNotFoundException : " + fe);

}

catch(IOException ioe)

{

System.out.println("IOException : " + ioe);

     }

   }

}

Read long from file using Data Input Stream

import java.io.DataInputStream;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

public class ReadLongFromFile

{

public static void main(String[] args)

{

String strFilePath = "C://FileIO//readLong.txt"; 

try

{

FileInputStream fin = new FileInputStream(strFilePath);

DataInputStream din = new DataInputStream(fin);

long l = din.readLong();

System.out.println("long : " + l);

din.close();       

}

catch(FileNotFoundException fe)

{

System.out.println("FileNotFoundException : " + fe);

}

catch(IOException ioe)

{

System.out.println("IOException : " + ioe);

   }

  }

}

Read short from file using Data Input Stream

import java.io.DataInputStream;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

public class ReadShortFromFile

{

public static void main(String[] args)

{

 String strFilePath = "C://FileIO//readShort.txt";

 try

{

FileInputStream fin = new FileInputStream(strFilePath);

DataInputStream din = new DataInputStream(fin);    

short s = din.readShort();     

System.out.println("short : " + s);

din.close();       

}

catch(FileNotFoundException fe)

{

System.out.println("FileNotFoundException : " + fe);

}

catch(IOException ioe)

{

System.out.println("IOException : " + ioe);

    }

  }

}

Read unsigned byte from file using Data Input Stream

import java.io.DataInputStream;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

public class ReadUnsignedByteFromFile

{

public static void main(String[] args)

{

String strFilePath = "C://FileIO//readUnsignedByte.txt";

try

{

FileInputStream fin = new FileInputStream(strFilePath);  DataInputStream din = new DataInputStream(fin);

int i = din.readUnsignedByte();      

System.out.println("Unsinged byte value : " + i);

din.close();

}

catch(FileNotFoundException fe)

{

System.out.println("FileNotFoundException : " + fe);

}

catch(IOException ioe)

{

System.out.println("IOException : " + ioe);

    }

  }

}

Create Data Output Stream from File Output Stream

import java.io.DataOutputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

public class CreateDataOutputStream

{

 public static void main(String[] args)

{

 String strFilePath = "C://FileIO//demo.txt";

 try

{

FileOutputStream fos = new FileOutputStream(strFilePath);

DataOutputStream dos = new DataOutputStream(fos);

}

catch(FileNotFoundException fe)

{

System.out.println("FileNotFoundException : " + fe);

     }

  }

}

Determine number of bytes written to Data Output Stream

import java.io.DataOutputStream;

import java.io.FileOutputStream;

import java.io.IOException;

public class NumberOfBytesWritten

{

 public static void main(String[] args)

{

 String strFilePath = "C://FileIO//NumberOfBytes.txt";

try

{

FileOutputStream fos = new FileOutputStream(strFilePath);

DataOutputStream dos = new DataOutputStream(fos);     

String str = "Example to show number of bytes written to stream";

dos.writeBytes(str);

int bytesWritten = dos.size();

System.out.println("Total " + bytesWritten + " bytes are written to stream.");

          dos.close();

}

catch (IOException e)

{

System.out.println("IOException : " + e);

     }

   }

}