How to move inputStream back to the first line?

[www]

Hi,

I have an inputStream to read a text file:

BufferedReader inputStream = new BufferedReader(new FileReader(fileName));
String line = inputStream.readLine();

After reading several lines, I hope to bring inputStream back to the
first line. How can I do it?

Right now, I do:

inputStream.close();
BufferedReader inputStream = new BufferedReader(new
FileReader(fileName)); //start over again. I feel it is a dumb way.

Thank you.

 

[Manish Pandit]

Hi,

I have an inputStream to read a text file:

BufferedReader inputStream = new BufferedReader(new FileReader(fileName));
String line = inputStream.readLine();

After reading several lines, I hope to bring inputStream back to the
first line. How can I do it?

Right now, I do:

inputStream.close();
BufferedReader inputStream = new BufferedReader(new
FileReader(fileName)); //start over again. I feel it is a dumb way.

Thank you.

One way could be to use mark( ) to mark the beginning of the file, and
then do a reset( ) which will take the pointer to the mark (beginning).
I do not think you can call reset after closing the stream though.

http://java.sun.com/j2se/1.4.2/docs/api/java/io/Reader.html#reset()

-cheers,
Manish

 

[Print Dude]

BufferedReader inputStream = new BufferedReader(new FileReader(fileName));
String line = inputStream.readLine();

After reading several lines, I hope to bring inputStream back to the
first line. How can I do it?

I had a similar issue a while ago. What I ended up doing was reading
the entire file into an ArrayList so that I could traverse it
sequetially.

 

[Mike Schilling]

I had a similar issue a while ago. What I ended up doing was reading
the entire file into an ArrayList so that I could traverse it
sequetially.

This is what precisely mark() and reset() are for (when they are supported,
that is.)

 

[Randolf Richardson]

Hi,

I have an inputStream to read a text file:

BufferedReader inputStream = new BufferedReader(new
FileReader(fileName));
String line = inputStream.readLine();

After reading several lines, I hope to bring inputStream back to the
first line. How can I do it?

Right now, I do:

inputStream.close();
BufferedReader inputStream = new BufferedReader(new
FileReader(fileName)); //start over again. I feel it is a dumb way.

Thank you.

There is a much easier way to read a text file which involves only one
class for all your I/O instead of the typical Java examples used to read a
file that use two or three (and sometimes more):

http://www.internationalnetwork.com/java/examples/DisplayFile.java

Then, use the java.io.RandomAccessFile.seek() method to change the
pointer back to 0.