Java Code Examples for org.mozilla.universalchardet.UniversalDetector#getDetectedCharset()

/**
 * This method extracts the charset from the html source code.
 * If the charset is not specified, it is set to UTF-8 by default
 * @param is
 * @return
 */
public static String extractCharset(InputStream is) throws java.io.IOException {
    byte[] buf = new byte[4096];
    UniversalDetector detector = new UniversalDetector(null);
    int nread;
    while ((nread = is.read(buf)) > 0 && !detector.isDone()) {
        detector.handleData(buf, 0, nread);
    }
    detector.dataEnd();

    String encoding = detector.getDetectedCharset();
    if (encoding != null) {
        LOGGER.debug("Detected encoding = " + encoding);
    } else {
        LOGGER.debug("No encoding detected.");
    }

    detector.reset();
    if (encoding != null && CrawlUtils.isValidCharset(encoding)) {
        return encoding;
    } else {
        return DEFAULT_CHARSET;
    }
}
 

private static String detectEncoding(File file) throws IOException {
	byte[] buf = new byte[4096];

	FileInputStream  fis = new FileInputStream(file);
	UniversalDetector detector = new UniversalDetector(null);
	
    int nread;
    while ((nread = fis.read(buf)) > 0 && !detector.isDone()) detector.handleData(buf, 0, nread);

    Util.closeStream(fis);
    
    detector.dataEnd();
    String encoding = detector.getDetectedCharset();
    
    if (encoding == null) encoding = DEFAULT_ENCODING;
	return encoding;
}
 

private String detectCharset() throws IOException {
    String result = "UTF-8";
    UniversalDetector detector = new UniversalDetector(null);
    byte[] buf = new byte[4096];

    try {
        FileInputStream fis = new FileInputStream(mFileName);
        int nread;
        while ((nread = fis.read(buf)) > 0 && !detector.isDone()) {
            detector.handleData(buf, 0, nread);
        }
        fis.close();
        detector.dataEnd();
        String encoding = detector.getDetectedCharset();
        if (encoding != null) {
            result = encoding;
        }

        detector.reset();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return result;
}
 

public static String detect(InputStream inputStream) throws IOException {
	UniversalDetector detector = Charset.getSingleton()
			.getCharsetDetector();
	byte[] buf = new byte[4096];
	int nread;
	while ((nread = inputStream.read(buf)) > 0 && !detector.isDone()) {
		detector.handleData(buf, 0, nread);
	}
	detector.dataEnd();
	String encoding = detector.getDetectedCharset();
	detector.reset();
	inputStream.close();
	if (encoding == null) {
		// If none encoding is detected, we assume UTF-8
		encoding = UTF8;
	}
	return encoding;
}
 

/**
 * Detecting real content encoding
 * @param content
 * @param offset
 * @return real charset encoding
 */
private String detectCharset(byte[] content, Integer offset){
    log.debug("detectCharset: offset=" + offset);

    // detect failed
    if( offset > content.length ) return null;

    UniversalDetector detector = new UniversalDetector(null);
    detector.handleData(content, offset, content.length - offset > detectBuffer ? detectBuffer : content.length - offset);
    detector.dataEnd();

    String detectEncoding = detector.getDetectedCharset();

    return null==detectEncoding?detectCharset(content,offset+detectBuffer):detectEncoding;
}
 

/**
 * Attempts to figure out the character set of the document using
 * the excellent juniversalchardet library.
 * 
 * @param resource
 * @return String character encoding found, or null if nothing looked good.
 * @throws IOException
 */
protected String getCharsetFromBytes(byte buffer[], int len) 
throws IOException {
	String charsetName = null;
    UniversalDetector detector = new UniversalDetector(null);
	detector.handleData(buffer, 0, len);
	detector.dataEnd();
    charsetName = detector.getDetectedCharset();
    detector.reset();
    if(isCharsetSupported(charsetName)) {
    	return mapCharset(charsetName);
    }
    return null;
}
 

public static String guessCharset(InputStream is) throws IOException{
	UniversalDetector detector = new UniversalDetector(null);
	byte[] buf = new byte[Constants.ENCODING_HELPER_BUFFER_SIZE];
	int nread;
	while ((nread = is.read(buf)) > 0 && !detector.isDone()) {
		detector.handleData(buf, 0, nread);
	}
	detector.dataEnd();
	String encoding = detector.getDetectedCharset();
	detector.reset();
	if (encoding != null)
		return encoding;
	return Constants.DEFAULT_ENCODING;
}
 

public static String detectEncodingOfArchive(File gzipped) throws IOException {
    FileInputStream fis = new FileInputStream(gzipped);
    GZIPInputStream gis = new GZIPInputStream(fis);
    byte[] buf = new byte[4096];

    UniversalDetector detector = new UniversalDetector(null);
    int read;
    while ((read = gis.read(buf)) > 0 && !detector.isDone()) {
        detector.handleData(buf, 0, read);
    }
    detector.dataEnd();
    gis.close();

    return detector.getDetectedCharset();
}
 

/**
 * 根据字节数组，猜测可能的字符集，如果检测失败，返回utf-8
 *
 * @param bytes 待检测的字节数组
 * @return 可能的字符集，如果检测失败，返回utf-8
 */
public static String guessEncodingByMozilla(byte[] bytes) {
    String DEFAULT_ENCODING = "UTF-8";
    UniversalDetector detector = new UniversalDetector(null);
    detector.handleData(bytes, 0, bytes.length);
    detector.dataEnd();
    String encoding = detector.getDetectedCharset();
    detector.reset();
    if (encoding == null) {
        encoding = DEFAULT_ENCODING;
    }
    return encoding;
}
 

protected static Charset guessCharset(FileObject fo) {
  Charset charset = StandardCharsets.UTF_8;
  byte[] buf = new byte[4096];

  try (InputStream is = fo.getInputStream()) {
    UniversalDetector detector = new UniversalDetector(null);

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

    detector.dataEnd();

    String encoding = detector.getDetectedCharset();

    if (encoding == null) {
      encoding = "ISO-8859-1";
    }

    detector.reset();

    charset = Charset.forName(encoding);
  } catch (IllegalArgumentException | IOException ex) {
    Exceptions.printStackTrace(ex);
  }

  return charset;
}
 

/**
     * 获取文件编码类型
     *
     * @param bytes 文件bytes数组
     * @return      编码类型
     */
    public static String getEncoding(byte[] bytes) {
        String defaultEncoding = "UTF-8";
        UniversalDetector detector = new UniversalDetector(null);
        detector.handleData(bytes, 0, bytes.length);
        detector.dataEnd();
        String encoding = detector.getDetectedCharset();
        detector.reset();
//        log.info("字符编码是：{}", encoding);
        if (encoding == null) {
            encoding = defaultEncoding;
        }
        return encoding;
    }
 

public static String readTextFromFile(File txtFile) throws IOException {
	byte[] buf = new byte[4096]; 
	java.io.FileInputStream fis = new FileInputStream(txtFile);

	// (1)
	UniversalDetector detector = new UniversalDetector(null);

	// (2)
	int nread;
	while ((nread = fis.read(buf)) > 0 && !detector.isDone()) {
	  detector.handleData(buf, 0, nread);
	}
	fis.close();
	// (3)
	detector.dataEnd();

	// (4)
	String encoding = detector.getDetectedCharset();
	if (encoding != null) {
	  logger.debug("Detected encoding = " + encoding);
	} else {
	  logger.debug("No encoding detected - use utf-8");
	  encoding = "utf-8";
	}

	// (5)
	detector.reset();

	String text = FileUtils.readFileToString(txtFile, encoding);
	//String text = FileUtils.readFileToString(txtFile, "ISO-8859-1");
	//logger.debug("text = "+text);
	
	return text;
}
 

public void setLyricFile(File file) {

        if (file == null || !file.exists()) {
            reset();
            mCurrentLyricFilePath = "";
            return;
        } else if (file.getPath().equals(mCurrentLyricFilePath)) {
            return;
        } else {
            mCurrentLyricFilePath = file.getPath();
            reset();
        }
        try {

            FileInputStream fis = new FileInputStream(file);
            byte[] buf = new byte[1024];
            UniversalDetector detector = new UniversalDetector(null);
            int nread;
            while ((nread = fis.read(buf)) > 0 && !detector.isDone()) {
                detector.handleData(buf, 0, nread);
            }

            detector.dataEnd();
            String encoding = detector.getDetectedCharset();
            if (encoding != null) {
                setLyricFile(file, encoding);
            } else {
                setLyricFile(file, "UTF-8");
            }
            detector.reset();
            fis.close();

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
 

/**
 * 获取文件编码
 * @author eko.zhan at Jul 3, 2017 1:54:50 PM
 * @param file
 * @return
 * @throws IOException 
 */
public static String getFileEncoding(File file) throws IOException{
	UniversalDetector detector = new UniversalDetector(null);
	byte[] bytes = FileUtils.readFileToByteArray(file);
	detector.handleData(bytes, 0, bytes.length);
	detector.dataEnd();
	return detector.getDetectedCharset();
}
 

public static String toString(InputStream is) {
  String encoding = "UTF-8";
  try {
    byte[] buf = new byte[4096];
    ByteArrayOutputStream output = new ByteArrayOutputStream();

    UniversalDetector detector = new UniversalDetector(null);

    int nread;
    while ((nread = is.read(buf)) > 0) {
      output.write(buf, 0, nread);
    }
    is.close();
    if (output.size() > 0) {
      byte[] data = output.toByteArray();
      detector.handleData(data, 0, data.length);
      detector.dataEnd();

      String detect = detector.getDetectedCharset();
      if (detect != null) {
        encoding = detect;
      }
      detector.reset();

      return new String(data, encoding);
    }

  } catch (IOException e) {
  }

  return "";
}
 

public void setLyricFile(File file) {

        if (file == null || !file.exists()) {
            reset();
            mCurrentLyricFilePath = "";
            return;
        } else if (file.getPath().equals(mCurrentLyricFilePath)) {
            return;
        } else {
            mCurrentLyricFilePath = file.getPath();
            reset();
        }
        try {

            FileInputStream fis = new FileInputStream(file);
            byte[] buf = new byte[1024];
            UniversalDetector detector = new UniversalDetector(null);
            int nread;
            while ((nread = fis.read(buf)) > 0 && !detector.isDone()) {
                detector.handleData(buf, 0, nread);
            }

            detector.dataEnd();
            String encoding = detector.getDetectedCharset();
            if (encoding != null) {
                setLyricFile(file, encoding);
            } else {
                setLyricFile(file, "UTF-8");
            }
            detector.reset();
            fis.close();

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
 

public static Track fromUri(Uri data) {
    Track t = new Track();

    String path = data.getPath();

    UniversalDetector detector = new UniversalDetector(null);
    int chan = BASS.BASS_StreamCreateFile(path, 0, 0, 0);

    String tags = null;
    for (int format = 0; format < FORMATS.length; format++) {
        final ByteBuffer byteBuffer = TAGS.TAGS_ReadExByte(chan, "%ARTI@%YEAR@%TRCK@%TITL@%ALBM@%COMP" + " ", FORMATS[format]);

        final int bufferSize = byteBuffer.capacity();
        if (bufferSize < 10)
            continue;

        final ByteBuffer frameBuf = ByteBuffer.allocate(bufferSize);
        frameBuf.put(byteBuffer);

        detector.handleData(frameBuf.array(), 0, bufferSize);
        detector.dataEnd();
        final String encoding = detector.getDetectedCharset();
        boolean wrongencoding = false;
        try {
            tags = new String(frameBuf.array(), 0, bufferSize, Charset.forName(encoding));
        } catch (Exception e) {
            wrongencoding = true;
        } finally {
            detector.reset();
        }
        if (wrongencoding)
            continue;
        if (!TextUtils.isEmpty(tags)) {
            if (tags.split("@").length >= 4)
                return null;
        }
    }

    if (TextUtils.isEmpty(tags))
        tags = TAGS.TAGS_Read(chan, "%UTF8(%ARTI)@%YEAR@%TRCK@%UTF8(%TITL)@%UTF8(%ALBM)@%UTF8(%COMP)" + " ");

    if (TextUtils.isEmpty(tags))
        return null;

    String[] tagsArray = tags.split("@");
    if (tagsArray.length <= 4)
        return null;

    tagsArray = tags.split("@");
    int duration = (int) (0.5d+BASS.BASS_ChannelBytes2Seconds(chan, BASS.BASS_ChannelGetLength(chan, BASS.BASS_POS_BYTE)));

    t.artist = tagsArray[0];
    t.title = tagsArray[3];
    t.duration = duration;
    t.path = path;

    if (t.title == null || t.title == "")
        t.setTitle(data.getLastPathSegment());

    return t;
}