Java MD5 String md5(final File file)

Description

md

License

Open Source License

Declaration

public static String md5(final File file) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.io.File;
import java.io.FileInputStream;

import java.io.InputStream;

import java.security.MessageDigest;

public class Main {
    public static String md5(final File file) {
        try {/*  w w  w  . ja  va  2  s.c  om*/
            final InputStream fin = new FileInputStream(file);
            final MessageDigest md5 = MessageDigest.getInstance("MD5");

            // read file into buffer and update digest
            byte[] buffer = new byte[1024];
            int read;
            while ((read = fin.read(buffer)) > 0) {
                md5.update(buffer, 0, read);
            }
            fin.close();

            // format output
            byte[] digest = md5.digest();
            if (digest == null)
                return null;
            String hash = "";
            for (int i = 0; i < digest.length; i++) {
                hash += Integer.toString((digest[i] & 0xff) + 0x100, 16).substring(1);
            }

            return hash;
        } catch (Exception e) {
            return null;
        }
    }
}

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