/**
* Converts UTF-16 inputFile to UTF-8 outputFile. Does not overwrite existing outputFile file.
*
* @param inputFile UTF-16 file
* @param outputFile UTF-8 file after conversion
* @throws IOException
*/
public static void convertFileFromUtf16ToUtf8(File inputFile, File outputFile)
throws IOException {
String charset;
if (inputFile == null || !inputFile.canRead()) {
throw new FileNotFoundException("Can't read inputFile.");
}
try {
charset = getFileCharset(inputFile);
} catch (IOException ex) {
LOGGER.debug("Exception during charset detection.", ex);
throw new IllegalArgumentException("Can't confirm inputFile is UTF-16.");
}
if (isCharsetUTF16(charset)) {
if (!outputFile.exists()) {
BufferedReader reader = null;
try {
if (equalsIgnoreCase(charset, CHARSET_UTF_16LE)) {
reader =
new BufferedReader(new InputStreamReader(new FileInputStream(inputFile), "UTF-16"));
} else {
reader =
new BufferedReader(
new InputStreamReader(new FileInputStream(inputFile), "UTF-16BE"));
}
} catch (UnsupportedEncodingException ex) {
LOGGER.warn("Unsupported exception.", ex);
throw ex;
}
BufferedWriter writer =
new BufferedWriter(new OutputStreamWriter(new FileOutputStream(outputFile), "UTF-8"));
int c;
while ((c = reader.read()) != -1) {
writer.write(c);
}
writer.close();
reader.close();
}
} else {
throw new IllegalArgumentException("File is not UTF-16");
}
}
