Java MD5 String md5(File file)

Description

Md5.

License

Open Source License

Parameter

Parameter	Description
file	the file

Exception

Parameter	Description
NoSuchAlgorithmException	the no such algorithm exception
IOException	Signals that an I/O exception has occurred.

Return

the string

Declaration

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

Method Source Code

//package com.java2s;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
import java.security.DigestInputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Main {
    /**// w  ww.j a  v  a 2 s . c om
     * Md5.
     *
     * @param file
     *            the file
     * @return the string
     * @throws NoSuchAlgorithmException
     *             the no such algorithm exception
     * @throws IOException
     *             Signals that an I/O exception has occurred.
     */
    public static String md5(File file) throws NoSuchAlgorithmException, IOException {
        MessageDigest md = MessageDigest.getInstance("MD5");
        InputStream is = new FileInputStream(file);

        is = new DigestInputStream(is, md);
        byte[] buf = new byte[2048];
        @SuppressWarnings("unused")
        int read;
        while ((read = is.read(buf)) != -1) {
            //
        }

        is.close();

        byte[] digest = md.digest();
        return new BigInteger(1, digest).toString(16);
    }

    /**
     * Md5.
     *
     * @param s
     *            the s
     * @return the string
     * @throws NoSuchAlgorithmException
     *             the no such algorithm exception
     */
    public static String md5(String s) throws NoSuchAlgorithmException {
        MessageDigest m = MessageDigest.getInstance("MD5");
        m.update(s.getBytes(), 0, s.length());
        return new BigInteger(1, m.digest()).toString(16);
    }
}

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