Compare size of file and size of byte array of that file

Question

When we convert the file (say - image) To byteArray how can be approximately compared between them (image file and byteArray) ?

Is there also a way to first convert image file to byteArray and this byteArray has to be written in a text-file.. Again after this read these lines of byteArray from text-file and make byteArray and hence converted to image file...... I'm beginner and just for knowledge purpose i want to know....

Answer 1

You can convert your image to byte array like this.

  BufferedImage bImage = ImageIO.read(new File("sample.jpg"));
  ByteArrayOutputStream bos = new ByteArrayOutputStream();
  ImageIO.write(bImage, "jpg", bos );
  byte [] data = bos.toByteArray();

Yes you can directly compare 2 byteArray.

Just do something like

if (bytearray1.length == bytearray2.length)
   //its same

Try this to write the ByteArray in text file

public void writeToFile(byte[] array) 
{ 
   try 
   { 
       String path = "/data/data/YOURFILE.txt"; //provide your path here
       File file = new File(path);
       if (!file.exists()) { //just to check if file is actually present
          file.createNewFile();
       }
       FileOutputStream stream = new FileOutputStream(path); 
       stream.write(array); 
   } catch (FileNotFoundException e1) 
   { 
      e1.printStackTrace(); 
   } 
}