java 获取文件SHA1和MD5

红太狼 2022-05-19 09:12 427阅读 0赞

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);
            }
        }
    }