Problem : How you can make copy of a binary file?

Contents

1. 1 Program :
   1. 1.1 Step 1 - Coding
   2. 1.2 Step 2 - Deployment
   3. 1.3 Step 3 - Testing
   4. 1.4 Output
2. 2 FAQ
   1. 2.1 What is FileInputStream?
   2. 2.2 What is FileOutputStream?

Solution : java.io.FileInputStream  will be used to read data from source binary file and java.io.FileOutStream will be used to write data to target binary file.

Program :

Step 1 - Coding

Create a text file c:/sunilos/CopyBinary.java and copy below contents.

import java.io.FileInputStream;
import java.io.FileOutputStream;

/**
 * A program to copy a binary file to another file.
 */
public class CopyBinary {

    public static void main(String[] args) throws Exception {
        String source = "c:/sunilos/sunilos1.jpg";
        String target = "c:/sunilos/sunilos.jpg";
       
        FileInputStream reader = new FileInputStream(source);
        FileOutputStream writer = new FileOutputStream(target);
       
        int ch = reader.read();
       
        while(ch!= -1){
            writer.write(ch);
            ch = reader.read();
        }
        writer.close();
        reader.close();
        System.out.println(source + " is copied " + target);
       
    }

}

Step 2 - Deployment

1. Create a folder 'c:\sunilos'. 
2. Create or copy CopyBinary.java into 'c:\sunilos' folder.
3. It is assumed that your hard drive has c:/sunilos/sunilos1.jpg file.
4. Open your command prompt and go to  'c:\sunilos'
   
5. Compile CopyBinary.java with help of 
• javac CopyBinary.java command. Command will create CopyBinary.class file in the same folder.
  
6. Congratulations!! your Java program is ready to serve.

Step 3 - Testing

1. Make sure you are on Command Prompt under c:\sunilos directory
   
2. Now start your java program from command prompt with help of 
• java CopyBinary command.
3. Now check your data open
• c:/sunilos/sunilos.jpg
  

Output

C:\sunilos>java -cp . com.sunilos.io.CopyBinary
c:/sunilos/sunilos1.jpg is copied c:/sunilos/sunilos.jpg

FAQ

What is FileInputStream?

• FileInputStream obtains input bytes from a file in a file system.
• FileInputStream is meant for reading streams of raw bytes such as image data.

What is FileOutputStream?

• A file output stream is an output stream for writing data to a File . Whether or not a file is available or may be created depends upon the underlying platform.
• FileOutputStream is meant for writing streams of raw bytes such as image data.