Java MD5 String md5(File file)

Description

md

License

Apache License

Declaration

public static String md5(File file) throws NoSuchAlgorithmException, IOException 

Method Source Code

//package com.java2s;
// Licensed under the Apache License, Version 2.0 (the "License");

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Main {
    public static String md5(File file) throws NoSuchAlgorithmException, IOException {
        //        try {
        //            String s = PULSAR_CAUSTIC.getAbsolutePath();
        //            MessageDigest md5 = MessageDigest.getInstance("MD5");
        //            md5.update(s.getBytes(), 0, s.length());
        //            String signature = new BigInteger(1, md5.digest()).toString(16);
        //            System.out.println("Signature: " + signature);
        ///*from  w w  w.  j  av a 2s .  co  m*/
        //        } catch (final NoSuchAlgorithmException e) {
        //            e.printStackTrace();
        //        }
        MessageDigest md = MessageDigest.getInstance("MD5");
        FileInputStream fis = new FileInputStream(file);

        byte[] dataBytes = new byte[1024];

        int nread = 0;
        while ((nread = fis.read(dataBytes)) != -1) {
            md.update(dataBytes, 0, nread);
        }

        fis.close();

        byte[] mdbytes = md.digest();
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < mdbytes.length; i++) {
            sb.append(Integer.toString((mdbytes[i] & 0xff) + 0x100, 16).substring(1));
        }
        //System.out.println("Digest(in hex format):: " + sb.toString());
        //assertEquals("8ff156ff36376d2517cef39cdd43876a", sb.toString());
        return sb.toString();
    }
}

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