/**
* 从语料库中随机读取一行字符
*
* @return
* @throws UnsupportedEncodingException
*/
String readRandomLine(EncodingSet encoding) throws UnsupportedEncodingException {
String line = null;
// 从语料库文件中随机取一个字节
int startIndex = NumberUtil.getRandomInt(-1, fileSize);
byte b = mapBuf.get(startIndex);
while (true) {
try {
if ((char) b == '\n') {
// 拿到第一个\n和第二个\n之间的串
byte[] lineBytes =
ByteBufferUtil.getBytesAbsoluteBeforeEOFChar(mapBuf, startIndex + 1, '\n');
line = new String(lineBytes, encoding.getEncode()).trim();
if (line.length() <= 1) {
startIndex += lineBytes.length + 1;
b = mapBuf.get(startIndex);
continue;
}
break;
} else {
b = mapBuf.get(++startIndex);
}
} catch (IndexOutOfBoundsException e) {
line = readRandomLine(encoding);
break;
}
}
return line;
}
/**
* @param maxLength 最大长度，单位byte。如果超过此长度则读另一行，直到找到<=maxLength的行
* @return
* @throws UnsupportedEncodingException
*/
String readRandomLine(int maxLength, EncodingSet encoding) throws UnsupportedEncodingException {
String line;
int lineLength;
do {
line = readRandomLine(encoding);
lineLength = line.getBytes(encoding.getEncode()).length;
} while (lineLength > maxLength);
return line;
}