Search in text file

[mark-mlt]

Hello all, im trying to do a search in a text file. Can any tell me why its not working. thx. here is my code;

import java.awt.Component;
import java.awt.ComponentOrientation;
import java.awt.Container;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.event.DocumentEvent;

public class Layout {
final static boolean shouldFill = true;
final static boolean shouldWeightX = true;
final static boolean RIGHT_TO_LEFT = false;
private static final Component btnGO = null;
private static JCheckBox commonWords;
private static TextField txtSearch;

public static void addComponentsToPane(Container pane) throws FileNotFoundException {
if (RIGHT_TO_LEFT) {
pane.setComponentOrientation(ComponentOrientation. RIGHT_TO_LEFT);

}

JButton button;
pane.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
if (shouldFill) {
//natural height, maximum width
c.fill = GridBagConstraints.HORIZONTAL;

}

TextField txtSearch;
txtSearch = new TextField("Click GO to Search");
if (shouldWeightX) {
c.weightx = 0.5;

}


c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 0;
pane.add(txtSearch, c);

final JLabel lblMsg = new JLabel();
pane.add(lblMsg, c);

JButton btnGO = new JButton("GO");
c.fill = GridBagConstraints.HORIZONTAL;
c.weightx = 0.5;
c.gridx = 1;
c.gridy = 0;
ActionListener actionPerformed = null;
btnGO.addActionListener (actionPerformed);

pane.add(btnGO, c);

commonWords = new JCheckBox("Common Words");
c.fill = GridBagConstraints.HORIZONTAL;
c.weightx = 0.5;
c.gridx = 2;
c.gridy = 0;
pane.add(commonWords, c);

// //button = new JButton("Long-Named Button 4");
final JTextArea textArea = new JTextArea("", 4, 30);
c.fill = GridBagConstraints.HORIZONTAL;
c.ipady = 40; //make this component tall
c.weightx = 0.0;
c.gridwidth = 3;
c.gridx = 0;
c.gridy = 1;
// textArea.

final JScrollPane sbrText;
sbrText = new JScrollPane(textArea);
sbrText.setVerticalScrollBarPolicy(JScrollPane.VER TICAL_SCROLLBAR_ALWAYS);

textArea.setAutoscrolls(true);

textArea.setLineWrap(true);
JScrollPane jScrollPane1;
jScrollPane1 = new JScrollPane(textArea);
textArea.setEditable(false);
// add(scrollPane, BorderLayout.CENTER);
pane.add(textArea, c);
pane.add(jScrollPane1, c);
String line;
sbrText.setVisible(true);
pane.add(sbrText, c);

Layout text; // this is the textarea you already have on your page
File theFile = new File ("Sentences.txt");
BufferedReader br = new BufferedReader (new FileReader ("Sentences.txt"));

try {
// String line;
while ((line = br.readLine()) != null) {
// final JTextArea textArea = null;
textArea.append (line);

}
} catch (IOException e) {
e.printStackTrace ();
JOptionPane.showConfirmDialog(null, "File not found.");
}
}

/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
* @throws FileNotFoundException
*/

private static void createAndShowGUI() throws FileNotFoundException {
//Create and set up the window.
JFrame frame = new JFrame("File Reader");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOS E);

//Set up the content pane.
addComponentsToPane(frame.getContentPane());
// addComponentsToPane(frame.sbrText.setVisible(true) );

//Display the window.
frame.setVisible(true);
//frame.sbrText.setVisible(true);
}


public void actionPerformed (ActionEvent event) {


System.out.println("yey clicked");
String s = txtSearch.getText();
if (s.length() <= 0) {
message("Nothing to search");
return;
}

String content = txtSearch.getText();
int index = content.indexOf(s, 0);
if (index >= 0) { // match found
try {
int end = index + s.length();
// hilit.addHighlight(index, end, painter);
txtSearch.setCaretPosition(end);
// entry.setBackground(entryBg);
message("'" + s + "' found.");
}
finally {
System.out.println("worked");
}
}
else {
// entry.setBackground(ERROR_COLOR);
message("'" + s + "' not found.");
}
}

void message(String msg) {
// lblMsg.setText(msg);
System.out.println(msg);
}

// DocumentListener methods





// public void search() {
// hilit.removeAllHighlights();


// class CancelAction extends AbstractAction {
// public void actionPerformed(ActionEvent ev) {
// hilit.removeAllHighlights();
// entry.setText("");
// entry.setBackground(entryBg); btnGO.addActionListener(this);

// }
// }




public static void main(String[] args) {

//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
try {
createAndShowGUI();
} catch (FileNotFoundException e1) {
e1.printStackTrace();
}

File file = new File("C:\\Documents and Settings\\Administrator.MYCOMPUTER\\My Documents\\School Documents\\IAD\\Assignments\\Java\\English Sentences\\Java Sentences.txt");
StringBuffer contents = new StringBuffer();
BufferedReader reader = null;

try
{
reader = new BufferedReader(new FileReader(file));
String text = null;

// repeat until all lines is read
while ((text = reader.readLine()) != null)
{
contents.append(text)
.append(System.getProperty(
"line.separator"));
}
} catch (FileNotFoundException e)
{
e.printStackTrace();
} catch (IOException e)
{
e.printStackTrace();
} finally
{
try
{
if (reader != null)
{
reader.close();
}
} catch (IOException e)
{
e.printStackTrace();
JOptionPane.showConfirmDialog(null, "File not found.");

}
}
}

});
};


protected static void lblMsg(String string) {
// TODO Auto-generated method stub

}




public static JCheckBox getCommonWords() {
return commonWords;
}




public static void setCommonWords(JCheckBox commonWords) {
Layout.commonWords = commonWords;
}




public static TextField getTxtSearch() {
return txtSearch;
}




public static void setTxtSearch(TextField txtSearch) {
Layout.txtSearch = txtSearch;
}


public static boolean isShouldFill() {
return shouldFill;
}




public static boolean isShouldWeightX() {
return shouldWeightX;
}




public static boolean isRIGHT_TO_LEFT() {
return RIGHT_TO_LEFT;
}




public static Component getBtnGO() {
return btnGO;
}

}

[new_2_java]

What's the error that you are getting?

[mark-mlt]

ermmm no errors... my problem is at the event handler i think ...

[mark-mlt]

any help pls???

[Bluefox815]

I think you're a little confused, here is an example program for searching a text file named "test_file.txt". This should show you how to use an ActionListener, and a BufferedReader

Code:

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;

/*
* this program searches for a string in a text file and
* says which line it found the string on
*/

public class SearchText implements ActionListener {

private String filename = "test_file.txt";

private JFrame frame;
private JTextField searchField;
private JButton searchButton;
private JLabel lineLabel;
private String searchFor;
private BufferedReader in;

public SearchText() {
frame = new JFrame("SearchText");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
searchField = new JTextField(10);
searchButton = new JButton("Search");
// this is used later in our actionPerformed method
searchButton.setActionCommand("search");
// this sets the action listener for searchButton, which is the current class
// because this class implements ActionListener
searchButton.addActionListener(this);
lineLabel = new JLabel("SearchText");
}

public void createGUI() {
JPanel topPanel = new JPanel();
topPanel.setLayout(new BoxLayout(topPanel, BoxLayout.X_AXIS));
JPanel bottomPanel = new JPanel();
JPanel mainPanel = new JPanel();
mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.Y_AXIS));
topPanel.add(searchField);
topPanel.add(searchButton);
bottomPanel.add(lineLabel);
mainPanel.add(topPanel);
mainPanel.add(bottomPanel);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setVisible(true);
}

public void actionPerformed(ActionEvent e) {
// now we get the action command and if it is search, then it is the button
if ("search".equals(e.getActionCommand())) {
searchFor = searchField.getText();
searchTheText();
}
}

private void searchTheText() {
// I initialize the buffered reader here so that every time the user searches
// then the reader will start at the beginning, instead of where it left off last time
try {
in = new BufferedReader(new FileReader(new File(filename)));
} catch (IOException e) {
}
String lineContent = null;
int currentLine = 0;
// this will be set to true if the string was found
boolean foundString = false;
while (true) {
currentLine++;
// get a line of text from the file
try {
lineContent = in.readLine();
} catch (IOException e) {
break;
}
// checks to see if the file ended (in.readLine() returns null if the end is reached)
if (lineContent == null) {
break;
}
if (lineContent.indexOf(searchFor) == -1) {
continue;
} else {
lineLabel.setText(String.valueOf(currentLine));
foundString = true;
break;
}
}
if (!foundString)
lineLabel.setText("Could not find string");
try {
in.close();
} catch (IOException ioe) {
} 
}

public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new SearchText().createGUI();
}
});
}

}