java 获取文件SHA1和MD5

一.获取SHA1

public static String getFileSha1(File file) 
{
    FileInputStream in = null;
    try
    {
        in = new FileInputStream(file);
        MessageDigest digest = MessageDigest.getInstance("SHA-1");
        byte[] buffer = new byte[1024 * 1024 * 10];

        int len = 0;
        while ((len = in.read(buffer)) > 0)
        {
            digest.update(buffer, 0, len);
        }
        String sha1 = new BigInteger(1, digest.digest()).toString(16);
        int length = 40 - sha1.length();
        if (length > 0)
        {
            for (int i = 0; i < length; i++)
            {
                sha1 = "0" + sha1;
            }
        }
        return sha1;
    }
    catch (IOException e)
    {
        System.out.println(e);
    }
    catch (NoSuchAlgorithmException e)
    {
        System.out.println(e);
    }
    finally
    {
        try
        {
            if (in != null)
            {
                in.close();
            }
        }
        catch (IOException e)
        {
            System.out.println(e);
        }
    }
}

二.获取MD5

public static String getFileMD5(File file)
{
    FileInputStream in = null;
    try
    {
        in = new FileInputStream(file);
        MessageDigest digest = MessageDigest.getInstance("MD5");
        byte[] buffer = new byte[1024 * 1024 * 10];

        int len = 0;
        while ((len = in.read(buffer)) > 0)
        {
            digest.update(buffer, 0, len);
        }
        String md5 = new BigInteger(1, digest.digest()).toString(16);
        int length = 32 - md5.length();
        if (length > 0)
        {
            for (int i = 0; i < length; i++)
            {
                md5 = "0" + md5;
            }
        }
        return md5;
    }
    catch (IOException e)
    {
        System.out.println(e);
    }
    catch (NoSuchAlgorithmException e)
    {
        System.out.println(e);
    }
    finally
    {
        try
        {
            if (in != null)
            {
                in.close();
            }
        }
        catch (IOException e)
        {
            System.out.println(e);
        }
    }
}