flatworm reading file from line nunber

Question

Is there any way to read a flat file from perticular line number? I heard about record-ident tag but not sure what to pass there.

There is no matching string, I need to read from a perticular libne number only.

Try http://stackoverflow.com/questions/2312756/in-java-how-to-read-from-a-file-a-specific-line-given-the-line-number — Hirak, Mar 21 '14 at 07:06
Read from a given line until the end or a line range? Are your lines of fixed length (note that it require that the encoding encodes with a fixed length as well)? — fge, Mar 21 '14 at 07:16

score 1 · Accepted Answer · answered Mar 21 '14 at 07:30

IOUtil is the utility class for accessing flat files.

IOUtil.lineIterator(Reader reader) can be useful for reading file from line nunber

LineIterator it = IOUtils.lineIterator(new BufferedReader(new FileReader("inputfile.txt")));
 for (int lineNoInFile = 0; it.hasNext(); lineNoInFile++) {
    String outputLine = (String) it.next();
    if (lineNoInFile == inputLineNumber) {
        return outputLine;
    }
 }

And to read multiple lines IOUtils.readLines can be used

int outputLinenumber = 25;      
List<String> lines = IOUtils.readLines(new FileInputStream(new File("inputfile.txt")), "UTF-8");
for (int index = outputLinenumber; index<=lines.size();index ++){
  //Iterate the Files
}

It's just sample code.

flatworm reading file from line nunber

1 Answers1