Jun
03
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We can use an MD5 implementation of the MessageDigest class to calculate the MD5 sum of a file (or any array of bytes). Once we have that it is simply a matter of feeding the contents of the file to the digest and have it calculate the MD5 sum as shown in the following example.
// Get an MD5 implementation of MessageDigest MessageDigest digest = MessageDigest.getInstance("MD5"); // Open file and read contents InputStream is = new FileInputStream(file); byte[] buffer = new byte[8192]; int read = 0; while( (read = is.read(buffer)) >= 0) { // pass data read from file to digest for processing digest.update(buffer, 0, read); } is.close(); // Get the MD5 sum byte[] md5sum = digest.digest(); // (Optionally) convert the MD5 byte array to a hex string String md5sumHex = new BigInteger(1, md5sum).toString(16);
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