01
Jul '11
Create an MD5 Hash on a File with Java
Pass it a filename and it’ll pass you back the Hash. Simple as that!
import java.io.*;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public String getMD5Hash(String fileName) {
String hash = "";
try {
File file = new File(fileName);
FileReader fileRead = new FileReader(file);
MessageDigest md = MessageDigest.getInstance("MD5");
char[] chars = new char[1024];
int charsRead = 0;
do {
charsRead = fileRead.read(chars, 0, chars.length);
if(charsRead >= 0) {
md.update(new String(chars, 0, charsRead).getBytes());
}
}
while(charsRead >= 0);
hash = new BigInteger(1, md.digest()).toString(16);
}
catch (NoSuchAlgorithmException e){}
catch (IOException e){}
return hash;
}