Java android fileinputstream fileoutputstream issue

Question

I need a little question.How can I repair that code so I can use it in android too.I need just to load a file from assets folder in android projet, decrypt it and to show the size of the file and how long it takes to the application to decrypt it.

Code :

package decryption;

import java.io.*;
import javax.crypto.*;
import javax.crypto.spec.*;

    public class Decryption {
      public static void main(String args[]) throws Exception {


          File file = new File("ecryption.pdf");
          System.out.println(file.getAbsolutePath());
          System.out.println("user.dir is: " + System.getProperty("user.dir"));

        Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
        SecretKeySpec keySpec = new SecretKeySpec("01234567890abcde".getBytes(), "AES");
        IvParameterSpec ivSpec = new IvParameterSpec("fedcba9876543210".getBytes());
        cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);

        FileInputStream fis   = new FileInputStream(new File("ecrypted.pdf"));
        long start = System.currentTimeMillis();
        System.out.print(start+"           ");
        CipherInputStream cis = new CipherInputStream(fis, cipher);
        FileOutputStream fos  = new FileOutputStream(new File("decrypted.pdf"));
        long end = System.currentTimeMillis();
        System.out.print(end);


        byte[] b = new byte[8];
        int i;

        while ((i = cis.read(b)) != -1) {
          fos.write(b, 0, i);
        }
        fos.flush(); fos.close();
        cis.close(); fis.close();       
      }
}

Vincent Mimoun-Prat · Accepted Answer · 2011-07-29 12:53:15Z

3

//      File file = new File("ecryption.pdf");
//      System.out.println(file.getAbsolutePath());
//      System.out.println("user.dir is: " + System.getProperty("user.dir"));

// FileInputStream fis   = new FileInputStream(new File("ecrypted.pdf"));
InputStream fis = getAssets().open("ecryption.pdf");

// FileOutputStream fos  = new FileOutputStream(new File("decrypted.pdf"));
FileOutputStream fos  = new FileOutputStream(
       new File(Environment.getExternalStorageDirectory(), "decrypted.pdf"));

Then you need to compile and adjust the rest.

answered Jul 29, 2011 at 12:53

Vincent Mimoun-Prat

28.6k16 gold badges85 silver badges126 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Android-Droid Over a year ago

This code is throwin me an Exception : 07-29 13:02:29.693: VERBOSE/Error(1112): Error java.io.FileNotFoundException: /sdcard/decrypted.pdf

Vincent Mimoun-Prat Over a year ago

Then correct and debug the program. Don't expect you'll get somebody to do it all for you. I have put you on the track.

Android-Droid Over a year ago

Thanks a lot, I fixed the error.I forgot to add the permission in manifest file.

user3315096 · Accepted Answer · 2014-02-18 03:58:20Z

this will copy one file at a time... start from there..

    public void copyAssets() {

    try {
        in = getAssets().open("aabbccdd.mp3");
        File outFolder = new File(root.getAbsolutePath() + "/testfolder182");
        outFolder.mkdir();
        File outFile = new File(outFolder, "ooooooooohhhigetit.mp3");
        out = new FileOutputStream(outFile);
        copyFile(in, out);
        in.close();
        in = null;
        out.flush();
        out.close();
        out = null;
    } catch (IOException e) {
        Log.e("tag", "Failed to copy asset file: ", e);
    }
}

private void copyFile(InputStream in, OutputStream out) throws IOException {
    byte[] buffer = new byte[1024];
    int read;
    while ((read = in.read(buffer)) != -1) {
        out.write(buffer, 0, read);
    }
}

Collectives™ on Stack Overflow

Java android fileinputstream fileoutputstream issue

2 Answers 2

3 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related