Thread: Block division in cryptography

I have used FileInputStream class but its not working properly to divide the bits into blocks.I will attach the coding,help me out to fix the problem.

public static void main(String[] args) {
 
ReadFileExample newclass = new ReadFileExample();
System.out.println("cryptography");
File input = new File("D:/java/source.txt");
File output = new File("D:/java/target.txt");
byte[] block = new byte[18];
try {
FileInputStream fis = new FileInputStream(input);
FileOutputStream fos = new FileOutputStream(output);
//CipherOutputStream cos = new CipherOutputStream(fos);
System.out.println("Total file size to read (in bytes) : "
+ fis.length());
int i;
while ((i = fis.read(byte[18]))!= -1) {
System.out.println(block);
fos.write(block, 0, i);
}
fos.close();
}
catch (Exception e)
{
System.out.println("invalid");
}
 
}}

First remove the compilation error from your code.

System.out.println("Total file size to read (in bytes) : "+fis.length());

There is no such method like "fis.length()" in FileInputStream class.

and ,

while ((i = fis.read(byte[18]))!= -1) {
System.out.println(block);
fos.write(block, 0, i);
}

Method fis.read(byte[]) take a byte array as a argument and there is no means of passing byte[18] in that. So instead of byte[18] pass block which is an byte array of length 18.

If you will face any problem then please paste the full error code.

//this is the code wat v have modifed..we have binary values such as 0's 1's in source.txt...this has to be divided into blocks of 144bit..i mean 18byte..this is our requirement


import java.io.*;
import java.lang.*;
import java.io.File;
import java.io.FileInputStream;
public class Ss {



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





System.out.println("cryptography");

File input = new File("D:\\Java\\jdk1.7.0\\bin\\source.txt");

File output = new File("D:\\Java\\jdk1.7.0\\bin\\target.txt");
byte[] block = new byte[18];




try {

FileInputStream fis = new FileInputStream(input);

FileOutputStream fos = new FileOutputStream(output);



int i;
//String s;

while ((i = fis.read(block))!=1) {

System.out.println(block);

fos.write(block, 0, i);
byte[] s= Integer.toString(i).getBytes("i");
System.out.println(s);
}

fos.close();

}
catch (IndexOutOfBoundsException e) {

System.out.println("I/O Error:" + e.getMessage());

}

finally {



}

}

}