MD5加密（字符串文件）工具类，直接用！！！

Posted 2023-02-15 胖子luffy

    public static String getFileMD5(File file) 
        if (!file.isFile()) 
            return null;
        
        MessageDigest digest;
        FileInputStream in = null;
        byte buffer[] = new byte[1024];
        int len;
        try 
            digest = MessageDigest.getInstance("MD5");
            in = new FileInputStream(file);
            while ((len = in.read(buffer, 0, 1024)) != -1) 
                digest.update(buffer, 0, len);
            

        
        catch (Exception e) 
            e.printStackTrace();
            return null;
        
        finally 
            if (in != null) 
                try 
                    in.close();
                
                catch (IOException e) 
                    e.printStackTrace();
                
            
        

        BigInteger bigint = new BigInteger(1, digest.digest());
        StringBuilder md5 = new StringBuilder(bigint.toString(16));

        return md5.toString();
    

    public static String MD5(String sourceStr) 
        String result = "";
        try 
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(sourceStr.getBytes());
            byte b[] = md.digest();
            int i;
            StringBuffer buf = new StringBuffer("");
            for (int offset = 0; offset < b.length; offset++) 
                i = b[offset];
                if (i < 0)
                    i += 256;
                if (i < 16)
                    buf.append("0");
                buf.append(Integer.toHexString(i));
            
            result = buf.toString();
        
        catch (NoSuchAlgorithmException e) 
            System.out.println(e);
        
        return result;