[JAVA] 파일 인코딩 타입 가져오기

    /**
     * 파일 인코딩 타입을 찾는다.
     *
     * @param file
     * @return
     * @throws IOException
     * @throws Exception
     */
    public static String detectCharset(File file) throws IOException, Exception {
        if (file == null || !file.exists()) {
            return null;
        }
       
        String result = “”;

        FileInputStream inputStream = null;

        try {
            inputStream = new FileInputStream(file);
            result =  detectCharset(inputStream);
           
        } catch (IOException e) {
            throw e;

        } catch (Exception e) {
            throw e;

        } finally {
            try {
                if (inputStream != null) {
                    inputStream.close();
                }
            } catch (NullPointerException e) {
            } catch (Exception e) {
            }
        }

        return result;
    }
   
   
    /**
     * 파일 인코딩 타입을 찾는다.
     *
     * @param inputStream
     * @return
     * @throws NullPointerException
     * @throws Exception
     */
    public static String detectCharset(InputStream inputStream) throws NullPointerException, Exception {

        int nread = 0;
        String encoding = “”;
        try {
            byte[] buf = new byte[1024];
            UniversalDetector detector = new UniversalDetector(null);

            while ((nread = inputStream.read(buf)) > 0 && !detector.isDone()) {
                detector.handleData(buf, 0, nread);
            }
            detector.dataEnd();

            encoding = detector.getDetectedCharset();
            if (encoding == null) {
                encoding = “”;
            }

            detector.reset();
       
        } catch (NullPointerException e) {
            throw e;
           
        } catch (Exception e) {
            throw e;
           
        } finally {
        }
       
        return encoding;
    }