Readline in buffer reader

Question

I've used readline() method to read first line of my buffer reader then,after checking something in the first line, I want to send my buffer reader into function, without loosing the first line, As I understood, the readline() method, seek the first line of buffer reader, how should I reverse it?

BufferedReader bufferedReader = new BufferedReader(serverinput);
String onelineofinput = bufferedReader.readLine();
if(onelineofinput...)
...
  then
  sendpackets(IPaddress, port, bufferedReader, connection);
  //bufferedreader should send completely here.

not quite a duplicate since the OP does not specifically ask about mark() and reset(). — wero, Mar 03 '16 at 15:26

wero · Accepted Answer · 2016-03-03T15:30:30.017

1

You can create a java.io.PushbackReader between the BufferedReader and the input.

After you have examined the first line you push it back to the PushbackReader (and also the line break which is swallowed by the BufferedReader) and then pass the PushbackReader to sendpackets.

PushbackReader pbreader = new PushbackReader (serverinput);
BufferedReader bufferedReader = new BufferedReader(pbreader);
String onelineofinput = bufferedReader.readLine();
if (onelineofinput...) {
    pbreader.unread(onelineofinput.toCharArray());
    pbreader.unread('\n');
    sendpackets(IPaddress, port, new BufferedReader(pbreader), connection);
}

edited Mar 03 '16 at 15:30

answered Mar 03 '16 at 15:25

wero

32,544
3
59
84

but i want to send bufferreader to my method .. @wero – Happy Developer Mar 03 '16 at 15:29
@user122434 then put it into in a new BufferedReader, see my edit. – wero Mar 03 '16 at 15:31
thanks, but why do you think that mark and reset is not good to use here?@wero – Happy Developer Mar 03 '16 at 15:31
@user122434 it is a viable solution if you can guarantee that the first line length is smaller than the buffer size of the BufferedReader. If you know that than go for it. – wero Mar 03 '16 at 15:34
ok, thank you very much:) – Happy Developer Mar 03 '16 at 15:35

Readline in buffer reader

1 Answers1