只需阅读第一行,忽略剩余内容并关闭流。智能FTP客户端不会在提供任何内容供读取之前将 整个 流缓冲在内存中。
假设您使用的是Apache Commons Net FTPClient:
BufferedReader reader = null;
String firstLine = null;
try {
InputStream stream = ftpClient.retrieveFileStream(ftpFile.getName());
reader = new BufferedReader(new InputStreamReader(stream, "UTF-8"));
firstLine = reader.readLine();
} finally {
if (reader != null) try { reader.close(); } catch (IOException logorIgnore) {}
}
doYourThingWith(firstLine);