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Thread: Seraching through files in a folder for a pattern match inside the files.

  1. #1
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    Default Seraching through files in a folder for a pattern match inside the files.

    I am new to java and I am having a problem with some code. I am trying to create a java GUI whereby users enter a piece of text to search and a folder to search. The code will then search iteratively through each file for the text and append the results in a jtextarea. My search works for just one file if I exclude the loop through the files. When looping it does not produce any errors but I receive no output. My code is:

    package searchfile;
     
    import java.io.*;
    import javax.swing.*;
    import java.nio.ByteBuffer;
    import java.nio.CharBuffer;
    import java.nio.channels.FileChannel;
    import java.nio.charset.Charset;
    import java.util.regex.Matcher;
    import java.util.regex.Pattern;
    import java.text.DateFormat;
    import java.util.Date;
    import java.util.ArrayList;
    import java.util.List;
     
    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { 
    //Runs the method to search through the files in a folder, this does not work yet!
    DoSearchFolder();
    } 
     
    /*Method to search iteratively through a folder and check all files for
    text search criteria - This is not working but yet produces no errors!
    */
    public void DoSearchFolder(){
     
    try {
     
    /*This bit appears to work as I get the message if the directory
    does not exist */
    File folder = new File(fileLocation.getText());
    String[] directory = folder.list();
    if (directory == null){
    JOptionPane.showMessageDialog(null, "This is not a directory or the directory does not exist");
    } else {
    /*From hear is where the problems seems to be, if only I got 
    errors! */
    for (int i=0; i<directory.length; i++){
    String listFilenames = directory[i];
     
     
    Pattern pattern =
    Pattern.compile(searchText.getText());
     
    Matcher matcher =
    pattern.matcher(fromFile(listFilenames));
     
    boolean found = false;
     
    while (matcher.find()) {
    String group = matcher.group();
    int start = matcher.start();
    int end = matcher.end();
    String endMatch = Integer.toString(end);
    String startMatch = Integer.toString(start);
     
    outputScreen.append("I found the text " + group + " starting at character " + startMatch + " and ending at character " + endMatch + " " + "from file " + listFilenames);
     
    found = true;
     
     
    }
     
    if(!found){
     
    JOptionPane.showMessageDialog(null, "No Match Found");
     
    }}}
     
     
    } catch (IOException e) {
     
    }}
     
    }

    I have only included the code I am having issues with and removed the rest. Any help would be greatly appreciated.
    Last edited by dazzabiggs; May 2nd, 2011 at 08:15 AM. Reason: added highlight tags


  2. #2
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: Seraching through files in a folder for a pattern match inside the files.

    I've added highlight tags, but that is way too much code for most of us to wade through. I suggest you throw together an SSCCE that demonstrates the problem. I only needs to be a few lines long; you can hardcode the pattern to search and output it to the command prompt.
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    Default Re: Seraching through files in a folder for a pattern match inside the files.

    I've now removed the extra code and condensed it down to only the bits I have an issue with. Cheers.

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    Default Re: Seraching through files in a folder for a pattern match inside the files.

    I'd love to help, but that's not an SSCCE because it contains references to stuff that you don't define. Like I said, a simple main method that searches for a hardcoded pattern and outputs to the command line in a barebones program would be best.
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    Default Re: Seraching through files in a folder for a pattern match inside the files.

    This thread has been cross posted here:

    http://www.java-forums.org/new-java/43383-searching-through-folder-find-text-inside-all-files.html

    Although cross posting is allowed, for everyone's benefit, please read:

    Java Programming Forums Cross Posting Rules

    The Problems With Cross Posting

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