problem comparing the 2 files reliable?

Hi, I have to check two files if the contents of the two files are the same or not? The thing is the file is located on a server and when I download a second file I have to check if this file already exists on the server? If I have to download the second file on the server and check the contents of the two files there is a problem. the problem is if two files are identical, then download the second file is useless. so the approach I took was to compare the amounts of the two files but then sometimes the checksum is the same even when two content of the file is not the same so is possible to treat this situation with no probability of error.

Published by: Denis on 11 March 2013 23:34

>
The only question is why it converts the hash in hexadecimal value? is it necessary?
>
Necessary? No - but the 'digest' method returns an array of bytes and outside Java which is not very useful.

        // get the hash value as byte array
        byte[] hash = algorithm.digest();

The 'normal' use is to provide the digest as a hexadecimal string value. If you download files from the web, a lot of times they will provide a digest (MD5 or SHA1), you can use to check that the downloaded file was not damaged and that it is, in fact, the correct file. These sites provide the digest as a hexadecimal string value. That makes it easy to cut & paste in order to compare it with another value.

In addition, copy the following code the 'calculateHashMessageDigest' method is declared to return a string

    public static String calculateHash(MessageDigest algorithm,

With the digest as a hexadecimal string value makes it easier to manipulate.

Tags: Java

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