Searching through a folder and checking all files for text inside.

[dazzabiggs]

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

I have only included the code I am having issues with and removed the rest. Any help would be greatly appreciated.