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POWriting to and reading from file - Java - Not reading what I wrote into file
 

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  1. POWriting to and reading from file - Java - Not reading what I wrote into file
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    <p>I'm executing an encryption algorithm and I need your help regarding writing to and reading from a <code>.xtt</code> file in Java. As part of the encryption, I basically need to write Base64 encoded bytes into a <code>.txt</code> file and read these exact bytes, decode them and use them to execute the decryption process. </p> <p>I seem to be reading something different compared to what I'm writing into the <code>.txt</code> file. Basically when I check the bytearray I'm writing into the file it is reads as <code>[B@56e5b723</code> but when I read it of my file it produces <code>[B@35a8767</code>. </p> <p>Here's the outcome as printed in my Java console:</p> <pre><code>***Numbs converted to ByteArray is as follows: [B@56e5b723 Size of NumbsByteArray is: 10 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -x-x-x-x-x WriteByteArrayToFile(byte[] encoded) HAS STARTED -x-x-x-x-x 6,7,8,9,10 has been received as a byte array in WriteByteArrayToFile(byte[] encoded): [B@56e5b723 6,7,8,9,10 IS TO BE WRITTEN TO THE FILE: /Users/anmonari/Desktop/textfiletwo.txt bs.write(encoded); HAS BEEN CALLED -x-x-x-x-x WriteByteArrayToFile(byte[] encoded) HAS ENDED -x-x-x-x-x ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -x-x-x-x-x ReadByteArray() HAS STARTED -x-x-x-x-x fileData read as bytes is: [B@35a8767 Size of fileData is: 10 fileDataString when converted to a string using String object is���������� fileDataString when converted to a string using fileDataStringTwo.toString()[B@35a8767 fileDataString.getBytes(); is: [B@2c6f7ce9 -x-x-x-x-x ReadByteArray() HAS ENDED -x-x-x-x-x*** </code></pre> <p>Below is my code:</p> <pre><code>package com.writeandreadfromfile; import java.io.BufferedOutputStream; import java.io.DataInputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; public class WriteAndRead { public static void main(String j[]) { String Numbs = "6,7,8,9,10"; byte[] NumbsByteArray = Numbs.getBytes(); System.out.println("Numbs converted to ByteArray is as follows: " + NumbsByteArray); System.out.println("Size of NumbsByteArray is: " + NumbsByteArray.length); System.out.println("\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"); WriteByteArrayToFile(NumbsByteArray); System.out.println("\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n"); try { ReadByteArrayFromFile(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } // Write ByteArray To File public static void WriteByteArrayToFile(byte[] NumbsByteArray) { System.out.println("\n-x-x-x-x-x WriteByteArrayToFile(byte[] encoded) HAS STARTED -x-x-x-x-x"); System.out.println("6,7,8,9,10 has been received as a byte array in WriteByteArrayToFile(byte[] encoded): " + NumbsByteArray); String fileName = "/Users/anmonari/Desktop/textfiletwo.txt"; System.out.println("6,7,8,9,10 IS TO BE WRITTEN TO THE FILE: " + fileName); BufferedOutputStream bs = null; try { FileOutputStream fs = new FileOutputStream(new File(fileName)); bs = new BufferedOutputStream(fs); bs.write(NumbsByteArray); System.out.println("bs.write(encoded); HAS BEEN CALLED"); bs.close(); bs = null; } catch (Exception e) { e.printStackTrace(); } if (bs != null) try { bs.close(); } catch (Exception e) {} System.out.println("-x-x-x-x-x WriteByteArrayToFile(byte[] encoded) HAS ENDED -x-x-x-x-x"); } // Read ByteArray To File public static void ReadByteArrayFromFile() throws IOException { // Create FileInputStream and feed it the file name System.out.println("-x-x-x-x-x ReadByteArray() HAS STARTED -x-x-x-x-x"); File file; try { file = new File("/Users/anmonari/Desktop/textfiletwo.txt"); // Create the object of DataInputStream DataInputStream in = new DataInputStream((new FileInputStream(file))); byte[] fileData = new byte[(int)file.length()]; System.out.println("fileData read as bytes is from file: " + fileData); System.out.println("Size of fileData is: " + fileData.length); //String fileDataString = in.readLine(); String fileDataString = new String(fileData); System.out.println("fileDataString when converted to a string using String object is" + fileDataString); String fileDataStringTwo = fileData.toString(); System.out.println("fileDataString when converted to a string using fileDataStringTwo.toString()" + fileDataStringTwo); fileDataString.getBytes(); System.out.println("fileDataString.getBytes(); is: " + fileDataString.getBytes()); //Close the input stream in.close(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } System.out.println("-x-x-x-x-x ReadByteArray() HAS ENDED -x-x-x-x-x"); } } </code></pre> <p>Any assistance regarding how to read from a file the exact byte array you wrote onto a file is appreciated!</p>
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      1. POWriting to and reading from file - Java - Not reading what I wrote into file
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    1. COYou don't do anything with the input stream `in`. You commented out the line.
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      1. POWriting to and reading from file - Java - Not reading what I wrote into file
      1. USSotirios Delimanolis
    2. COAside from that, I'm thinking encodings - UTF-8 vs UTF-16 automatic detection may be going on?
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    3. COAnother tip: when you print `NumbsByteArray`, use `Arrays.toString(NumbsByteArray)`. What you're printing right now is the memory address, which you don't care about.
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      1. POWriting to and reading from file - Java - Not reading what I wrote into file
      1. USNathaniel Waisbrot
 

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