Re: How can I detect a carriage return using java.net

From:

java@starflag.net

Newsgroups:

comp.lang.java.programmer

Date:

21 Oct 2006 08:44:04 -0700

Message-ID:

<1161445444.291257.142940@b28g2000cwb.googlegroups.com>

Angus,

BufferedReader does return null when there is more data to read.
However, when dealing with a socket (based on the "tserverSocket"
variable name), its possible that if the connection is still active
that the empty string might be what is being returned. The
BufferedReader.readLine() method automatically strips off the carriage
return so trying to match based on that will never be true.

For example, if the stream sends "one\ntwo\nthree\n" The first
invocation of readLine() would return "one", etc.

I think I need a little more information about the tserverSocket to
assist more on this.

kavaj

Angus wrote:

Hello

I have code a bit like this:

BufferedReader bis = new BufferedReader(new
InputStreamReader(tserverSocket.getInputStream()));

// Here I write some data - getting a response - some lines of text returned

  boolean more = true;
  while(more)
  {
   String line = bis.readLine();
   if (line == null)
    more = false;
   else
    System.out.println(line);
  }

But code never gets out of while loop.

I assumed when there was no more input it would return null, so more would
be set to false and it would exit loop.

I want to test for a carriage return. (I know text is in ASCII format, and
I know end of each line has a carriange return and line feed.

So I tried doing this:

       if (line.indexOf("\n") != -1)
      {
                     break;
       }

But it didn't seem to find \n . How should I test for a carriage return?

Angus