Android File MD5 Hash getMD5Sum(String file)

Description

Returns the lowercase string representation of the file's MD5 sum.

Declaration

public static String getMD5Sum(String file) throws IOException 

Method Source Code

//package com.java2s;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Main {
    /**/*from   w  w w.j ava  2  s  . co  m*/
     * Returns the lowercase string representation of the file's MD5 sum.
     */
    public static String getMD5Sum(String file) throws IOException {
        try {
            MessageDigest digest = MessageDigest.getInstance("MD5");
            InputStream is = new FileInputStream(file);
            byte[] buffer = new byte[8192];
            int read = 0;
            while ((read = is.read(buffer)) > 0) {
                digest.update(buffer, 0, read);
            }
            is.close();
            byte[] md5sum = digest.digest();
            BigInteger bigInt = new BigInteger(1, md5sum);
            return bigInt.toString(16);
        } catch (NoSuchAlgorithmException e) {
            return "";
        }
    }
}