help with my first project on first job, how to read a strange file, thanks a lot!!!!!!!

Discussion in 'Java' started by matt, Oct 22, 2004.

  1. matt

    matt Guest

    Java guys:
    this is my first project at my first job. so pls help if you could.
    i am working with a text file with strange format. The file has a lot
    of white space between the last line of valid text and the end of
    file character. And the file is update frequently. New valid text is
    appended behind the original valid text and overwrite some whitespace.
    I need to feed this file as an input to an application. but this
    application only take files without such whitespace. The application
    need to read the file frequently to see whether new text is appended.
    if there is, get the appended text.
    My initial solution is to convert the original file into a new file in
    which the whitespace is truncated. then the application can read the
    new file.
    possibility 1:
    loop
    read 1 line of text of original file
    write this line to new file
    until read the long line of white space
    close both file


    in this case, what class and method should i use, especially in
    examing the white spaces?

    possibility 2:
    the previous one is not smart because the same text is read and write
    each time when the file is read. so is there a way i can just each
    time check whether update happens to the file and then just write the
    update to the new file? such as in C, a file pointer know the position
    of last read. can i do the same in Java or C#? or other ways to do it?
    possibility 3:
    very unlikely but smarter,
    read the file in a stream, truncate the whitespace inside the
    stream, then feed the stream directly into the application. but it is
    unlikely because i can not change the souce code the application.

    any other possibilies to solve this problem?
    for all the possibilities, pls tell me what class and method should i
    use, sample code and website is extremely helpful.
    thanks a lot!!!!!
    matt, Oct 22, 2004
    #1
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  2. matt

    Paul Lutus Guest

    matt wrote:

    > Java guys:
    > this is my first project at my first job. so pls help if you could.
    > i am working with a text file with strange format. The file has a lot
    > of white space between the last line of valid text and the end of
    > file character. And the file is update frequently. New valid text is
    > appended behind the original valid text and overwrite some whitespace.
    > I need to feed this file as an input to an application. but this
    > application only take files without such whitespace. The application
    > need to read the file frequently to see whether new text is appended.
    > if there is, get the appended text.


    First things first. Explain exactly what the file consists of. Do not
    describe it, show it.

    Second, for what is probably true about your file, use String.trim() on the
    text lines that you read from the file.

    --
    Paul Lutus
    http://www.arachnoid.com
    Paul Lutus, Oct 22, 2004
    #2
    1. Advertising

  3. matt

    Alex Kizub Guest

    Re: help with my first project on first job, how to read a strange file,thanks a lot!!!!!!!

    You didn't mention OS. Probably it could be solved only by OS tools.
    For example for UNIX like it could be grep, tail -f, awk... |, >

    Java has other features, but since you can't change application and should
    only change the file (which is not good solution itself) here are some
    solutions for you.

    Use java.io.RandomAccessFile.
    So you can set position which you alreadu reached with method seek, you
    can know length of new open file with method
    length().
    Then, I suggest, read file with method read(byte[] b) copy none white
    spaces to another array and write it to the new file.
    Pretty easy.

    BTW. With java.io.File you can understand last modification time and
    decide do you need reread file again.

    Good luck in your new job.
    Alex Kizub.
    matt wrote:

    > Java guys:
    > this is my first project at my first job. so pls help if you could.
    > i am working with a text file with strange format. The file has a lot
    > of white space between the last line of valid text and the end of
    > file character. And the file is update frequently. New valid text is
    > appended behind the original valid text and overwrite some whitespace.
    > I need to feed this file as an input to an application. but this
    > application only take files without such whitespace. The application
    > need to read the file frequently to see whether new text is appended.
    > if there is, get the appended text.
    > My initial solution is to convert the original file into a new file in
    > which the whitespace is truncated. then the application can read the
    > new file.
    > possibility 1:
    > loop
    > read 1 line of text of original file
    > write this line to new file
    > until read the long line of white space
    > close both file
    >
    > in this case, what class and method should i use, especially in
    > examing the white spaces?
    >
    > possibility 2:
    > the previous one is not smart because the same text is read and write
    > each time when the file is read. so is there a way i can just each
    > time check whether update happens to the file and then just write the
    > update to the new file? such as in C, a file pointer know the position
    > of last read. can i do the same in Java or C#? or other ways to do it?
    > possibility 3:
    > very unlikely but smarter,
    > read the file in a stream, truncate the whitespace inside the
    > stream, then feed the stream directly into the application. but it is
    > unlikely because i can not change the souce code the application.
    >
    > any other possibilies to solve this problem?
    > for all the possibilities, pls tell me what class and method should i
    > use, sample code and website is extremely helpful.
    > thanks a lot!!!!!
    Alex Kizub, Oct 22, 2004
    #3
  4. matt

    Alex Hunsley Guest

    Re: help with my first project on first job, how to read a strangefile, thanks a lot!!!!!!!

    Paul Lutus wrote:
    > matt wrote:
    >
    >
    >>Java guys:
    >>this is my first project at my first job. so pls help if you could.
    >>i am working with a text file with strange format. The file has a lot
    >>of white space between the last line of valid text and the end of
    >>file character. And the file is update frequently. New valid text is
    >>appended behind the original valid text and overwrite some whitespace.
    >> I need to feed this file as an input to an application. but this
    >>application only take files without such whitespace. The application
    >>need to read the file frequently to see whether new text is appended.
    >>if there is, get the appended text.

    >
    >
    > First things first. Explain exactly what the file consists of. Do not
    > describe it, show it.


    OP: To add to that: as well as pasting the text of the file (or a
    pertinent example), a hexdump to show the actual bytes would be useful.
    (Or else we don't know what the whitespace we're seeing actually is -
    tabs, spaces, weird chars etc.)

    alex
    Alex Hunsley, Oct 23, 2004
    #4
  5. matt

    matt Guest

    here is a sample of the file.

    2004-10-21 12:51:06 10.10.1.6 - 10.10.1.3 80 GET /test.html:1256 - 404
    Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.0)
    2004-10-21 12:51:10 10.10.1.6 - 10.10.1.3 80 GET /test.html:12534 -
    404 Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.0)
    2004-10-21 13:55:50 10.10.1.6 - 10.10.1.3 80 GET / - 403
    Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.0)
    2004-10-21 13:55:53 10.10.1.6 - 10.10.1.3 80 GET /aseere - 404
    Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.0)
    2004-10-21 13:55:57 10.10.1.6 - 10.10.1.3 80 GET /aseegegeg - 404
    Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.0)
    2004-10-21 13:56:03 10.10.1.6 - 10.10.1.3 80 GET /aseegegggeegergeg -
    404 Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.0)
    2004-10-21 13:56:07 10.10.1.6 - 10.10.1.3 80 GET
    /asegegeegegegegggeegergeg - 404
    Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.0)
    2004-10-21 13:59:08 10.10.1.6 - 10.10.1.3 80 GET /grgejihghewgho - 404
    Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.0)
    2004-10-21 13:59:15 10.10.1.6 - 10.10.1.3 80 GET /grgejihghewghos -
    404 Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.0)
    2004-10-21 13:59:18 10.10.1.6 - 10.10.1.3 80 GET /grgejihghewghossaf -
    404 Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.0)
    2004-10-21 14:03:05 10.10.1.6 - 10.10.1.3 80 GET /12 - 404
    Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.0)
    2004-10-21 14:03:09 10.10.1.6 - 10.10.1.3 80 GET /1234 - 404
    Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.0)
    2004-10-21 14:09:24 10.10.1.6 - 10.10.1.3 80 GET /1234gt - 404
    Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.0)
    2004-10-21 14:21:17 10.10.1.6 - 10.10.1.3 80 GET /1234gtffffff - 404
    Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.0)


    this is IIS log file. i am not sure how to make hexdump. but the white
    space is space bar. thanks a lot

    Alex Hunsley <> wrote in message news:<6lped.6543$>...
    > Paul Lutus wrote:
    > > matt wrote:
    > >
    > >
    > >>Java guys:
    > >>this is my first project at my first job. so pls help if you could.
    > >>i am working with a text file with strange format. The file has a lot
    > >>of white space between the last line of valid text and the end of
    > >>file character. And the file is update frequently. New valid text is
    > >>appended behind the original valid text and overwrite some whitespace.
    > >> I need to feed this file as an input to an application. but this
    > >>application only take files without such whitespace. The application
    > >>need to read the file frequently to see whether new text is appended.
    > >>if there is, get the appended text.

    > >
    > >
    > > First things first. Explain exactly what the file consists of. Do not
    > > describe it, show it.

    >
    > OP: To add to that: as well as pasting the text of the file (or a
    > pertinent example), a hexdump to show the actual bytes would be useful.
    > (Or else we don't know what the whitespace we're seeing actually is -
    > tabs, spaces, weird chars etc.)
    >
    > alex
    matt, Oct 25, 2004
    #5
  6. matt

    matt Guest

    Re: help with my first project on first job, how to read a strange file, thanks a lot!!!!!!!

    the OS is mainly windows. i doubt windows has powerful tool to do the
    job automatically.
    i need to open and close the file frequently because another process
    is writing to the file. then Java create a new object each time I open
    the file. in this case, can the program remeber the position I set
    last time?
    if yes, can i do the same thing with BufferedReader class instead of
    RandomAccessFile. i am not sure whether RandomAccessFile can easily
    allow me to keep the new line characters and white space among the
    valid text. i need these chars in the application. The length() can
    not help me a lot, since the file size does not change when new text
    is written into the file. the new text write over the whitespace but
    do not change the file size.
    thanks again!
    Alex Kizub <> wrote in message news:<>...
    > You didn't mention OS. Probably it could be solved only by OS tools.
    > For example for UNIX like it could be grep, tail -f, awk... |, >
    >
    > Java has other features, but since you can't change application and should
    > only change the file (which is not good solution itself) here are some
    > solutions for you.
    >
    > Use java.io.RandomAccessFile.
    > So you can set position which you alreadu reached with method seek, you
    > can know length of new open file with method
    > length().
    > Then, I suggest, read file with method read(byte[] b) copy none white
    > spaces to another array and write it to the new file.
    > Pretty easy.
    >
    > BTW. With java.io.File you can understand last modification time and
    > decide do you need reread file again.
    >
    > Good luck in your new job.
    > Alex Kizub.
    > matt wrote:
    >
    > > Java guys:
    > > this is my first project at my first job. so pls help if you could.
    > > i am working with a text file with strange format. The file has a lot
    > > of white space between the last line of valid text and the end of
    > > file character. And the file is update frequently. New valid text is
    > > appended behind the original valid text and overwrite some whitespace.
    > > I need to feed this file as an input to an application. but this
    > > application only take files without such whitespace. The application
    > > need to read the file frequently to see whether new text is appended.
    > > if there is, get the appended text.
    > > My initial solution is to convert the original file into a new file in
    > > which the whitespace is truncated. then the application can read the
    > > new file.
    > > possibility 1:
    > > loop
    > > read 1 line of text of original file
    > > write this line to new file
    > > until read the long line of white space
    > > close both file
    > >
    > > in this case, what class and method should i use, especially in
    > > examing the white spaces?
    > >
    > > possibility 2:
    > > the previous one is not smart because the same text is read and write
    > > each time when the file is read. so is there a way i can just each
    > > time check whether update happens to the file and then just write the
    > > update to the new file? such as in C, a file pointer know the position
    > > of last read. can i do the same in Java or C#? or other ways to do it?
    > > possibility 3:
    > > very unlikely but smarter,
    > > read the file in a stream, truncate the whitespace inside the
    > > stream, then feed the stream directly into the application. but it is
    > > unlikely because i can not change the souce code the application.
    > >
    > > any other possibilies to solve this problem?
    > > for all the possibilities, pls tell me what class and method should i
    > > use, sample code and website is extremely helpful.
    > > thanks a lot!!!!!
    matt, Oct 25, 2004
    #6
  7. matt

    Paul Lutus Guest

    matt wrote:

    > here is a sample of the file.


    / ... snip unformatted text sample

    > this is IIS log file. i am not sure how to make hexdump. but the white
    > space is space bar.


    1. If you want to become successful in computer programming, you need to
    adopt more strict thinking and reporting standards. For example, when you
    write sentences, pretend that your prose will be compiled by an "English"
    compiler, one that, just like a Java compiler, requires you to put in all
    the words you believe to be unimportant.

    2. To solve this specific problem, even to describe the problem, you have to
    tighten up your thinking and writing.

    3. Tell us exactly what you plan to do with the file, and exactly what is in
    it. The above pasted text leaves out some crucial information, because it
    is unformatted text.

    On carefully reading your posts, I must ask how much experience you have
    writing Java programs. Have you considered reading the file's lines and
    trimming whitespace from the lines before further processing? If you did
    this, the original problem you state wold most likely be solved (assuming
    your description is correct).

    Yo may be able to simply read input lines, trim whitespace using
    String.trim(), and emit the same lines, like this:

    java MyProgramName < inputfile | destination_application

    5. Where is your code? I ask because we do not ordinarily write code to
    solve problems posted by programmers who do not post their own code, and we
    also do not do this, on principle, for students who do not post code.

    --
    Paul Lutus
    http://www.arachnoid.com
    Paul Lutus, Oct 25, 2004
    #7
  8. matt

    Alex Kizub Guest

    Re: help with my first project on first job, how to read a strange file, thanks a lot!!!!!!!

    I just wonder why people are not tired to reinvent the wheel.
    There are so much good log analyzers...

    Here you are:

    import java.io.*;
    public class LogAnalyzer {

    public static void main(String[] args) throws Exception {
    System.out.println("LogAnalyser starts");

    File logFile=new File("abc.log");
    long seek,lastModified;
    seek=lastModified=0;

    RandomAccessFile ra=new RandomAccessFile(logFile,"r");
    String rez;

    while((rez=ra.readLine())!=null){
    System.out.println(rez);
    seek=ra.getFilePointer();
    }
    ra.close();
    lastModified=logFile.lastModified();

    int step=200;
    while (--step>0){
    Thread.sleep(1000);
    if (lastModified!=logFile.lastModified()){
    ra=new RandomAccessFile(logFile,"r");
    ra.seek(seek);
    while((rez=ra.readLine())!=null){
    System.out.println("added="+rez);
    seek=ra.getFilePointer();
    }
    ra.close();
    lastModified=logFile.lastModified();
    }
    }

    System.out.println("LogAnalyser ends");
    }
    }


    I hope you know what to do with String except to print it.
    Alex Kizub.

    (matt) wrote in message news:<>...
    > the OS is mainly windows. i doubt windows has powerful tool to do the
    > job automatically.
    > i need to open and close the file frequently because another process
    > is writing to the file. then Java create a new object each time I open
    > the file. in this case, can the program remeber the position I set
    > last time?
    > if yes, can i do the same thing with BufferedReader class instead of
    > RandomAccessFile. i am not sure whether RandomAccessFile can easily
    > allow me to keep the new line characters and white space among the
    > valid text. i need these chars in the application. The length() can
    > not help me a lot, since the file size does not change when new text
    > is written into the file. the new text write over the whitespace but
    > do not change the file size.
    > thanks again!
    > Alex Kizub <> wrote in message news:<>...
    > > You didn't mention OS. Probably it could be solved only by OS tools.
    > > For example for UNIX like it could be grep, tail -f, awk... |, >
    > >
    > > Java has other features, but since you can't change application and should
    > > only change the file (which is not good solution itself) here are some
    > > solutions for you.
    > >
    > > Use java.io.RandomAccessFile.
    > > So you can set position which you alreadu reached with method seek, you
    > > can know length of new open file with method
    > > length().
    > > Then, I suggest, read file with method read(byte[] b) copy none white
    > > spaces to another array and write it to the new file.
    > > Pretty easy.
    > >
    > > BTW. With java.io.File you can understand last modification time and
    > > decide do you need reread file again.
    > >
    > > Good luck in your new job.
    > > Alex Kizub.
    > > matt wrote:
    > >
    > > > Java guys:
    > > > this is my first project at my first job. so pls help if you could.
    > > > i am working with a text file with strange format. The file has a lot
    > > > of white space between the last line of valid text and the end of
    > > > file character. And the file is update frequently. New valid text is
    > > > appended behind the original valid text and overwrite some whitespace.
    > > > I need to feed this file as an input to an application. but this
    > > > application only take files without such whitespace. The application
    > > > need to read the file frequently to see whether new text is appended.
    > > > if there is, get the appended text.
    > > > My initial solution is to convert the original file into a new file in
    > > > which the whitespace is truncated. then the application can read the
    > > > new file.
    > > > possibility 1:
    > > > loop
    > > > read 1 line of text of original file
    > > > write this line to new file
    > > > until read the long line of white space
    > > > close both file
    > > >
    > > > in this case, what class and method should i use, especially in
    > > > examing the white spaces?
    > > >
    > > > possibility 2:
    > > > the previous one is not smart because the same text is read and write
    > > > each time when the file is read. so is there a way i can just each
    > > > time check whether update happens to the file and then just write the
    > > > update to the new file? such as in C, a file pointer know the position
    > > > of last read. can i do the same in Java or C#? or other ways to do it?
    > > > possibility 3:
    > > > very unlikely but smarter,
    > > > read the file in a stream, truncate the whitespace inside the
    > > > stream, then feed the stream directly into the application. but it is
    > > > unlikely because i can not change the souce code the application.
    > > >
    > > > any other possibilies to solve this problem?
    > > > for all the possibilities, pls tell me what class and method should i
    > > > use, sample code and website is extremely helpful.
    > > > thanks a lot!!!!!
    Alex Kizub, Oct 25, 2004
    #8
  9. matt

    matt Guest

    Re: help with my first project on first job, how to read a strange file, thanks a lot!!!!!!!

    thanks a lot! this code illustrate clearly how to use the "lastmodify"
    and "file pointer". it is really helpful. i will modify it to handle
    the white space at the end and also write it to a new file. I will
    also change the sleep(), because this may cause a starvation with
    another process which write to the same file.
    by the way, could you give me some website that i can find Java code?
    thanks again!!!!!!!!!!!!!!
    (Alex Kizub) wrote in message news:<>...
    > I just wonder why people are not tired to reinvent the wheel.
    > There are so much good log analyzers...
    >
    > Here you are:
    >
    > import java.io.*;
    > public class LogAnalyzer {
    >
    > public static void main(String[] args) throws Exception {
    > System.out.println("LogAnalyser starts");
    >
    > File logFile=new File("abc.log");
    > long seek,lastModified;
    > seek=lastModified=0;
    >
    > RandomAccessFile ra=new RandomAccessFile(logFile,"r");
    > String rez;
    >
    > while((rez=ra.readLine())!=null){
    > System.out.println(rez);
    > seek=ra.getFilePointer();
    > }
    > ra.close();
    > lastModified=logFile.lastModified();
    >
    > int step=200;
    > while (--step>0){
    > Thread.sleep(1000);
    > if (lastModified!=logFile.lastModified()){
    > ra=new RandomAccessFile(logFile,"r");
    > ra.seek(seek);
    > while((rez=ra.readLine())!=null){
    > System.out.println("added="+rez);
    > seek=ra.getFilePointer();
    > }
    > ra.close();
    > lastModified=logFile.lastModified();
    > }
    > }
    >
    > System.out.println("LogAnalyser ends");
    > }
    > }
    >
    >
    > I hope you know what to do with String except to print it.
    > Alex Kizub.
    >
    > (matt) wrote in message news:<>...
    > > the OS is mainly windows. i doubt windows has powerful tool to do the
    > > job automatically.
    > > i need to open and close the file frequently because another process
    > > is writing to the file. then Java create a new object each time I open
    > > the file. in this case, can the program remeber the position I set
    > > last time?
    > > if yes, can i do the same thing with BufferedReader class instead of
    > > RandomAccessFile. i am not sure whether RandomAccessFile can easily
    > > allow me to keep the new line characters and white space among the
    > > valid text. i need these chars in the application. The length() can
    > > not help me a lot, since the file size does not change when new text
    > > is written into the file. the new text write over the whitespace but
    > > do not change the file size.
    > > thanks again!
    > > Alex Kizub <> wrote in message news:<>...
    > > > You didn't mention OS. Probably it could be solved only by OS tools.
    > > > For example for UNIX like it could be grep, tail -f, awk... |, >
    > > >
    > > > Java has other features, but since you can't change application and should
    > > > only change the file (which is not good solution itself) here are some
    > > > solutions for you.
    > > >
    > > > Use java.io.RandomAccessFile.
    > > > So you can set position which you alreadu reached with method seek, you
    > > > can know length of new open file with method
    > > > length().
    > > > Then, I suggest, read file with method read(byte[] b) copy none white
    > > > spaces to another array and write it to the new file.
    > > > Pretty easy.
    > > >
    > > > BTW. With java.io.File you can understand last modification time and
    > > > decide do you need reread file again.
    > > >
    > > > Good luck in your new job.
    > > > Alex Kizub.
    > > > matt wrote:
    > > >
    > > > > Java guys:
    > > > > this is my first project at my first job. so pls help if you could.
    > > > > i am working with a text file with strange format. The file has a lot
    > > > > of white space between the last line of valid text and the end of
    > > > > file character. And the file is update frequently. New valid text is
    > > > > appended behind the original valid text and overwrite some whitespace.
    > > > > I need to feed this file as an input to an application. but this
    > > > > application only take files without such whitespace. The application
    > > > > need to read the file frequently to see whether new text is appended.
    > > > > if there is, get the appended text.
    > > > > My initial solution is to convert the original file into a new file in
    > > > > which the whitespace is truncated. then the application can read the
    > > > > new file.
    > > > > possibility 1:
    > > > > loop
    > > > > read 1 line of text of original file
    > > > > write this line to new file
    > > > > until read the long line of white space
    > > > > close both file
    > > > >
    > > > > in this case, what class and method should i use, especially in
    > > > > examing the white spaces?
    > > > >
    > > > > possibility 2:
    > > > > the previous one is not smart because the same text is read and write
    > > > > each time when the file is read. so is there a way i can just each
    > > > > time check whether update happens to the file and then just write the
    > > > > update to the new file? such as in C, a file pointer know the position
    > > > > of last read. can i do the same in Java or C#? or other ways to do it?
    > > > > possibility 3:
    > > > > very unlikely but smarter,
    > > > > read the file in a stream, truncate the whitespace inside the
    > > > > stream, then feed the stream directly into the application. but it is
    > > > > unlikely because i can not change the souce code the application.
    > > > >
    > > > > any other possibilies to solve this problem?
    > > > > for all the possibilities, pls tell me what class and method should i
    > > > > use, sample code and website is extremely helpful.
    > > > > thanks a lot!!!!!
    matt, Oct 26, 2004
    #9
  10. Re: help with my first project on first job, how to read a strange file, thanks a lot!!!!!!!

    On 26 Oct 2004 06:33:38 -0700, matt wrote:

    Please don't top-post matt.
    <http://www.physci.org/codes/javafaq.jsp#netiquette>

    > could you give me some website that i can find Java code?


    <http://www.physci.org/codes/javafaq.jsp#res>
    <http://www.google.com/search?as_q=source&as_sitesearch=mindprod.com>
    ...and the big one..
    <http://www.google.com/search?q=%22java+source+code%22>

    --
    Andrew Thompson
    http://www.PhySci.org/codes/ Web & IT Help
    http://www.PhySci.org/ Open-source software suite
    http://www.1point1C.org/ Science & Technology
    http://www.LensEscapes.com/ Images that escape the mundane
    Andrew Thompson, Oct 27, 2004
    #10
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