Re: Dealing with AS/400 text file io

["Dave Wall" <dawall@xxxxxxxxxx>]

I spoke too soon.  Jeff found a way to use ReadLine with
IFSTextFileInputStream....

David Wall
AS/400 Toolbox for Java

---------------------------------------------------------------------------------------------------------------------------------------


Dave,
Here's how a person could do readLine() against an IFS text file, using
existing Toolbox classes and methods.  Though it's not an obvious solution,
it works fine.  After discussing with Chris, I think the most attractive
solution for now is to advertise this technique (in the javadoc,
Programmer's Guide, etc), and not add any new classes or methods.

- Jeff


    AS400 as400 = new AS400(args[0], args[1], args[2]);  // Grab first 3
args: sysname, uid, pwd
    String filePath = "/File1";
    int fileCcsid = Integer.parseInt(args[3]);    // Grab fourth arg: file
data CCSID.

    // Write Strings to the IFS file.
    IFSTextFileOutputStream outStream = new IFSTextFileOutputStream(as400,
filePath, fileCcsid);
    ConvTableWriter convWriter = new ConvTableWriter(outStream, fileCcsid);

    // Note: There's no need to construct a BufferedWriter over convWriter,
    // since ConvTableWriter already does its own buffering.
    System.out.println("Writing to file...");
    for (int i=0; i<10; i++) {
      convWriter.write("This is line " + i + "\n");
    }
    convWriter.close();

    // Read lines as Strings from the IFS file.
    IFSTextFileInputStream inStream = new IFSTextFileInputStream(as400,
filePath);
    ConvTableReader convReader = new ConvTableReader(inStream, fileCcsid);

    // Note: ConvTableReader does its own internal buffering, but to get a
readLine()
    // method, we need a BufferedReader.
    BufferedReader bReader = new BufferedReader(convReader);
    System.out.println("\nReading from file...");
    String line = bReader.readLine();
    while (line != null) {
      System.out.println(line);
      line = bReader.readLine();
    }
    bReader.close();



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It is a text file on IFS.  I tried to use IFSFile,IFSFileInputStream,
IFSFileOutputStream, etc. but there isn't a readLine() method in these
classes.  I want to be able to read one line at a time.  With IFS file
access classes above, you can only read for a specific amount of byte at a
time not per line basis.


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