How to read .txt file into a 2D array ? Pls help !
I have a .txt file with contents as shown :
1 0 1 0 1 0 1 0
1 0 1 1 1 0 0 1
1 0 1 0 1 0 1 0
1 0 1 1 1 0 0 1
1 0 1 1 1 0 0 1
1 0 1 1 1 0 0 1
1 0 1 1 1 0 0 1
1 0 1 1 1 0 0 1
1 0 1 1 1 0 0 1
1 0 1 1 1 0 0 1
and so on...until 10 samples in total.
How do I create a class which has a method (which I can call later) to put all those binary digits in a 2-D array ? The method should automatically extract data from the .txt file and put it into a 2-D array. How do I do that please ?
Please help someone ? It's pretty urgent....:-(
This one takes the cake: essentially the same question, cross-posted 11 times:
http://forum.java.sun.com/thread.jsp?thread=560218&forum=57&message=2752602
http://forum.java.sun.com/thread.jsp?thread=560219&forum=426&message=2752600
http://forum.java.sun.com/thread.jsp?thread=560220&forum=31&message=2752599
http://forum.java.sun.com/thread.jsp?thread=560220&forum=31&message=2752583
http://forum.java.sun.com/thread.jsp?thread=560220&forum=31&message=2752519
http://forum.java.sun.com/thread.jsp?thread=560219&forum=426&message=2752518
http://forum.java.sun.com/thread.jsp?thread=560218&forum=57&message=2752517
http://forum.java.sun.com/thread.jsp?thread=559967&forum=31&message=2750787
http://forum.java.sun.com/thread.jsp?thread=559968&forum=57&message=2750767
http://forum.java.sun.com/thread.jsp?thread=559967&forum=31&message=2750751
http://forum.java.sun.com/thread.jsp?thread=559964&forum=426&message=2750734
DON'T CROSS-POST! Send your question to one forum. You waste people's time
doing anything else.
How To Ask Questions The Smart Way
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How to Read a File into a Byte Array??
I want to make an array of data objects that works as a byffer to write from a file to another file
do you have any sygestions?The way I would do it (if I dont misunderstand your question) is to use FileInputStream to pass in the streaming data source.
then read the file source to a list object. For example, LikedList.
then tell the LikedList to transcribe itself to an array of any type, in this case, byte. -
Also problem read txt files into JTable
hello,
i used the following method to load a .txt file into JTable
try{
FileInputStream fin = new FileInputStream(filename);
InputStreamReader isr = new InputStreamReader(fin);
BufferedReader br = new BufferedReader(isr);
StringTokenizer st1 = new StringTokenizer(br.readLine(), "|");
while( st1.hasMoreTokens() )
columnNames.addElement(st1.nextToken());
while ((aLine = br.readLine()) != null)
StringTokenizer st2 = new StringTokenizer(aLine, "|");
Vector row = new Vector();
while(st2.hasMoreTokens())
row.addElement(st2.nextToken());
data.addElement( row );
br.close();
}catch(Exception e){ e.printStackTrace(); }
//colNum = st1.countTokens();
model = new DefaultTableModel(data,columnNames);
table.setModel(model);but there is a problem : if cell A's location is (4,5),and its left neighbour,that is, cell(4,4) is blank (the value is ""), the the cell A's value will be displayed in cell(4,4).if cell(4,3) is also blank ,the cell A's value will be displayed in cell(4,3).that is,the non-blank value will be displayed in the first blank cell of the line.
how can i solve it?Please give me some helps or links.
Thank u very much!Or, use the String.split(..) method to tokenize the data
Or, use my SimpleTokenizer class which you can find by using the search function. -
Reading .txt file into char array, file not found error. (Basic IO)
Iv been having some trouble with reading characters from a text file into a char array. I havnt been learning io for very long but i think im getting the hang of it. Reading and writing raw bytes
and things like that. But i wanted to try using java.io.FileReader to read characters for a change and im having problems with file not found errors. here is the code.
try
File theFile = new File("Mr.DocumentReadMe.txt");
String path = theFile.getCanonicalPath();
FileReader readMe = new FileReader(path);
char buffer[] = new char[(int)theFile.length()];
int readData = 0;
while(readData != -1)
readData = readMe.read(buffer);
jEditorPane1.setText(String.valueOf(buffer));
catch(Exception e)
JOptionPane.showMessageDialog(null, e,
"Error!", JOptionPane.ERROR_MESSAGE);
The error is: java.io.FileNotFoundException: C:\Users\Kaylan\Documents\NetBeansProjects\Mr.Document\dist\Mr.DocumentReadMe.txt (The system cannot find the file specified)
The text file is saved in the projects dist folder. I have tried saving it elsewhere and get the same error with a different pathname.
I can use JFileChooser to get a file and read it into a char array with no problem, why doesnt it work when i specify the path manually in the code?Well the file clearly isn't there. Maybe it has a .txt.txt extensionthat Windows is kindly hiding from you - check its Properties.
But:
String path = theFile.getCanonicalPath();
FileReader readMe = new FileReader(path);You don't need all that. Just:
FileReader readMe = new FileReader(theFile);And:
char buffer[] = new char[(int)theFile.length()];You don't need a buffer the size of the file, this is bad practice. Use 8192 or whatever.
while(readData != -1)
readData = readMe.read(buffer);
}That doesn't make sense. Read the data into the buffer and repeat until you get EOF? and do nothing with the contents of the buffer? The canonical read loop in Java goes like this:
while ((count = in.read(buffer)) > 0)
out.write(buffer, 0, count); // or do something else with buffer[0..count-1].
jEditorPane1.setText(String.valueOf(buffer));Bzzt. That won't give you the content of 'buffer'. Use new String(buffer, 0, count) at least. -
Problem reading .txt-file into JTable
My problem is that I�m reading a .txt-file into a J-Table. It all goes okay, the FileChooser opens and the application reads the selected file (line). But then I get a Null Pointer Exception and the JTable does not get updated with the text from the file.
Here�s my code (I kept it simple, and just want to read the text from the .txt-file to the first cell of the table.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
import java.util.*;
import java.lang.*;
import java.io.*;
public class TeamTable extends JFrame implements ActionListener, ItemListener {
static JTable table;
// constructor
public TeamTable() {
super( "Invoermodule - Team Table" );
setSize( 740, 365 );
// setting the rownames
ListModel listModel = new AbstractListModel() {
String headers[] = {"Team 1", "Team 2", "Team 3", "Team 4", "Team 5", "Team 6", "Team 7", "Team 8", "Team 9",
"Team 10", "Team 11", "Team 12", "Team 13", "Team 14", "Team 15", "Team 16", "Team 17", "Team 18"};
public int getSize() { return headers.length; }
public Object getElementAt(int index) { return headers[index]; }
// add listModel & rownames to the table
DefaultTableModel defaultModel = new DefaultTableModel(listModel.getSize(),3);
JTable table = new JTable( defaultModel );
// setting the columnnames and center alignment of table cells
int width = 200;
int[] vColIndex = {0,1,2};
String[] ColumnName = {"Name Team", "Name Chairman", "Name Manager"};
TableCellRenderer centerRenderer = new CenterRenderer();
for (int i=0; i < vColIndex.length;i++) {
table.getColumnModel().getColumn(vColIndex).setHeaderValue(ColumnName[i]);
table.getColumnModel().getColumn(vColIndex[i]).setPreferredWidth(width);
table.getColumnModel().getColumn(vColIndex[i]).setCellRenderer(centerRenderer);
table.setFont(new java.awt.Font("Dialog", Font.ITALIC, 12));
// force the header to resize and repaint itself
table.getTableHeader().resizeAndRepaint();
// create single component to add to scrollpane (rowHeader is JList with argument listModel)
JList rowHeader = new JList(listModel);
rowHeader.setFixedCellWidth(100);
rowHeader.setFixedCellHeight(table.getRowHeight());
rowHeader.setCellRenderer(new RowHeaderRenderer(table));
// add to scroll pane:
JScrollPane scroll = new JScrollPane( table );
scroll.setRowHeaderView(rowHeader); // Adds row-list left of the table
getContentPane().add(scroll, BorderLayout.CENTER);
// add menubar, menu, menuitems with evenlisteners to the frame.
JMenuBar menubar = new JMenuBar();
setJMenuBar (menubar);
JMenu filemenu = new JMenu("File");
menubar.add(filemenu);
JMenuItem open = new JMenuItem("Open");
JMenuItem save = new JMenuItem("Save");
JMenuItem exit = new JMenuItem("Exit");
open.addActionListener(this);
save.addActionListener(this);
exit.addActionListener(this);
filemenu.add(open);
filemenu.add(save);
filemenu.add(exit);
filemenu.addItemListener(this);
// ActionListener for ActionEvents on JMenuItems.
public void actionPerformed(ActionEvent e) {
String open = "Open";
String save = "Save";
String exit = "Exit";
if (e.getSource() instanceof JMenuItem) {
JMenuItem source = (JMenuItem)(e.getSource());
String x = source.getText();
if (x == open) {
System.out.println("open file");
// create JFileChooser.
String filename = File.separator+"tmp";
JFileChooser fc = new JFileChooser(new File(filename));
// set default directory.
File wrkDir = new File("C:/Documents and Settings/Erwin en G-M/Mijn documenten/Erwin/Match Day");
fc.setCurrentDirectory(wrkDir);
// show open dialog.
int returnVal = fc.showOpenDialog(null);
File selFile = fc.getSelectedFile();
if(returnVal == JFileChooser.APPROVE_OPTION) {
System.out.println("You chose to open this file: " +
fc.getSelectedFile().getName());
try {
BufferedReader invoer = new BufferedReader(new FileReader(selFile));
String line = invoer.readLine();
System.out.println(line);
// THIS IS WHERE IT GOES WRONG, I THINK
table.setValueAt(line, 1, 1);
table.fireTableDataChanged();
catch (IOException ioExc){
if (x == save) {
System.out.println("save file");
if (x == exit) {
System.out.println("exit file");
// ItemListener for ItemEvents on JMenu.
public void itemStateChanged(ItemEvent e) {
String s = "Item event detected. Event source: " + e.getSource();
System.out.println(s);
public static void main(String[] args) {
TeamTable frame = new TeamTable();
frame.setUndecorated(true);
frame.getRootPane().setWindowDecorationStyle(JRootPane.FRAME);
frame.addWindowListener( new WindowAdapter() {
public void windowClosing( WindowEvent e ) {
System.exit(0);
frame.setVisible(true);
* Define the look/content for a cell in the row header
* In this instance uses the JTables header properties
class RowHeaderRenderer extends JLabel implements ListCellRenderer {
* Constructor creates all cells the same
* To change look for individual cells put code in
* getListCellRendererComponent method
RowHeaderRenderer(JTable table) {
JTableHeader header = table.getTableHeader();
setOpaque(true);
setBorder(UIManager.getBorder("TableHeader.cellBorder"));
setHorizontalAlignment(CENTER);
setForeground(header.getForeground());
setBackground(header.getBackground());
setFont(header.getFont());
* Returns the JLabel after setting the text of the cell
public Component getListCellRendererComponent( JList list,
Object value, int index, boolean isSelected, boolean cellHasFocus) {
setText((value == null) ? "" : value.toString());
return this;My problem is that I�m reading a .txt-file into a J-Table. It all goes okay, the FileChooser opens and the application reads the selected file (line). But then I get a Null Pointer Exception and the JTable does not get updated with the text from the file.
Here�s my code (I kept it simple, and just want to read the text from the .txt-file to the first cell of the table.
A MORE READABLE VERSION !
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;
import java.util.*;
import java.lang.*;
import java.io.*;
public class TeamTable extends JFrame implements ActionListener, ItemListener {
static JTable table;
// constructor
public TeamTable() {
super( "Invoermodule - Team Table" );
setSize( 740, 365 );
// setting the rownames
ListModel listModel = new AbstractListModel() {
String headers[] = {"Team 1", "Team 2", "Team 3", "Team 4", "Team 5", "Team 6", "Team 7", "Team 8", "Team 9",
"Team 10", "Team 11", "Team 12", "Team 13", "Team 14", "Team 15", "Team 16", "Team 17", "Team 18"};
public int getSize() { return headers.length; }
public Object getElementAt(int index) { return headers[index]; }
// add listModel & rownames to the table
DefaultTableModel defaultModel = new DefaultTableModel(listModel.getSize(),3);
JTable table = new JTable( defaultModel );
// setting the columnnames and center alignment of table cells
int width = 200;
int[] vColIndex = {0,1,2};
String[] ColumnName = {"Name Team", "Name Chairman", "Name Manager"};
TableCellRenderer centerRenderer = new CenterRenderer();
for (int i=0; i < vColIndex.length;i++) {
table.getColumnModel().getColumn(vColIndex).setHeaderValue(ColumnName[i]);
table.getColumnModel().getColumn(vColIndex[i]).setPreferredWidth(width);
table.getColumnModel().getColumn(vColIndex[i]).setCellRenderer(centerRenderer);
table.setFont(new java.awt.Font("Dialog", Font.ITALIC, 12));
// force the header to resize and repaint itself
table.getTableHeader().resizeAndRepaint();
// create single component to add to scrollpane (rowHeader is JList with argument listModel)
JList rowHeader = new JList(listModel);
rowHeader.setFixedCellWidth(100);
rowHeader.setFixedCellHeight(table.getRowHeight());
rowHeader.setCellRenderer(new RowHeaderRenderer(table));
// add to scroll pane:
JScrollPane scroll = new JScrollPane( table );
scroll.setRowHeaderView(rowHeader); // Adds row-list left of the table
getContentPane().add(scroll, BorderLayout.CENTER);
// add menubar, menu, menuitems with evenlisteners to the frame.
JMenuBar menubar = new JMenuBar();
setJMenuBar (menubar);
JMenu filemenu = new JMenu("File");
menubar.add(filemenu);
JMenuItem open = new JMenuItem("Open");
JMenuItem save = new JMenuItem("Save");
JMenuItem exit = new JMenuItem("Exit");
open.addActionListener(this);
save.addActionListener(this);
exit.addActionListener(this);
filemenu.add(open);
filemenu.add(save);
filemenu.add(exit);
filemenu.addItemListener(this);
// ActionListener for ActionEvents on JMenuItems.
public void actionPerformed(ActionEvent e) {
String open = "Open";
String save = "Save";
String exit = "Exit";
if (e.getSource() instanceof JMenuItem) {
JMenuItem source = (JMenuItem)(e.getSource());
String x = source.getText();
if (x == open) {
System.out.println("open file");
// create JFileChooser.
String filename = File.separator+"tmp";
JFileChooser fc = new JFileChooser(new File(filename));
// set default directory.
File wrkDir = new File("C:/Documents and Settings/Erwin en G-M/Mijn documenten/Erwin/Match Day");
fc.setCurrentDirectory(wrkDir);
// show open dialog.
int returnVal = fc.showOpenDialog(null);
File selFile = fc.getSelectedFile();
if(returnVal == JFileChooser.APPROVE_OPTION) {
System.out.println("You chose to open this file: " +
fc.getSelectedFile().getName());
try {
BufferedReader invoer = new BufferedReader(new FileReader(selFile));
String line = invoer.readLine();
System.out.println(line);
// THIS IS WHERE IT GOES WRONG, I THINK
table.setValueAt(line, 1, 1);
table.fireTableDataChanged();
catch (IOException ioExc){
if (x == save) {
System.out.println("save file");
if (x == exit) {
System.out.println("exit file");
// ItemListener for ItemEvents on JMenu.
public void itemStateChanged(ItemEvent e) {
String s = "Item event detected. Event source: " + e.getSource();
System.out.println(s);
public static void main(String[] args) {
TeamTable frame = new TeamTable();
frame.setUndecorated(true);
frame.getRootPane().setWindowDecorationStyle(JRootPane.FRAME);
frame.addWindowListener( new WindowAdapter() {
public void windowClosing( WindowEvent e ) {
System.exit(0);
frame.setVisible(true);
* Define the look/content for a cell in the row header
* In this instance uses the JTables header properties
class RowHeaderRenderer extends JLabel implements ListCellRenderer {
* Constructor creates all cells the same
* To change look for individual cells put code in
* getListCellRendererComponent method
RowHeaderRenderer(JTable table) {
JTableHeader header = table.getTableHeader();
setOpaque(true);
setBorder(UIManager.getBorder("TableHeader.cellBorder"));
setHorizontalAlignment(CENTER);
setForeground(header.getForeground());
setBackground(header.getBackground());
setFont(header.getFont());
* Returns the JLabel after setting the text of the cell
public Component getListCellRendererComponent( JList list,
Object value, int index, boolean isSelected, boolean cellHasFocus) {
setText((value == null) ? "" : value.toString());
return this; -
How to store txt file into Oracle 7 Database using Pro*C
Hi,
I want to store a txt file into Oracle 7 database table using
Pro*C application. But do not know what type of column to use.
At first glance it appeared to me as LONG can serve the purpose
but later I noticed that I can not do the sequential read/write
in LONG type of column. That is, I have to use chunks of max of
2GB (or file lenght) to read/write into such columns.
I want something simiar to CLOB of Oracle 8.
I would appreciate if you can provide me solution.
Thanks,
AnuragYou store images in a BLOB column in the database.
However, inserting image in that column and displaying data/image from that column are 2 very different tasks.
If you are using Oracle forms, displaying is easy. Default block sitting on the table with BLOB column, can be easily mapped to image box (or similar control), which will display that image.
Inserting images will be a different ball game. If your forms are web based (i.e. run from browser) and you want to insert images from client machine, some special arrangements are required.
If images are on database server and you want to insert them in database, the stored procedure given in the earlier thread (posted above) will do the job. -
(Urgent help needed) how to read txt file and store the data into 2D-array?
Hi, I have a GUI which allow to choose file from the file chooser, and when "Read file" button is pressed, I want to show the array data into the textarea.
The sample data is like this followed:
-0.0007 -0.0061 0.0006
-0.0002 0.0203 0.0066
0 0.2317 0.008
0.0017 0.5957 0.0008
0.0024 1.071 0.0029
0.0439 1.4873 -0.0003
I want my program to scan through and store these data into 2D array.
However for some reason, my source code issues errors, and I don't know what's wrong with it, seems to have a problem in StringTokenizer though. Can anybody help me?
Thanks in advance.
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.StringTokenizer;
public class FileReduction1 extends JFrame implements ActionListener{
// GUI features
private BufferedReader fileInput;
private JTextArea textArea;
private JButton openButton, readButton,processButton,saveButton;
private JTextField textfield;
private JPanel pnlfile;
private JPanel buttonpnl;
private JPanel buttonbar;
// Other fields
private File fileName;
private String[][] data;
private int numLines;
public FileReduction1(String s) {
super(s);
// Content pane
Container cp = getContentPane();
cp.setLayout(new BorderLayout());
// Open button Panel
pnlfile=new JPanel(new BorderLayout());
textfield=new JTextField();
openButton = new JButton("Open File");
openButton.addActionListener(this);
pnlfile.add(openButton,BorderLayout.WEST);
pnlfile.add(textfield,BorderLayout.CENTER);
readButton = new JButton("Read File");
readButton.addActionListener(this);
readButton.setEnabled(false);
pnlfile.add(readButton,BorderLayout.EAST);
cp.add(pnlfile, BorderLayout.NORTH);
// Text area
textArea = new JTextArea(10, 100);
cp.add(new JScrollPane(textArea),BorderLayout.CENTER);
processButton = new JButton("Process");
//processButton.addActionListener(this);
saveButton=new JButton("Save into");
//saveButton.addActionListener(this);
buttonbar=new JPanel(new FlowLayout(FlowLayout.RIGHT));
buttonpnl=new JPanel(new GridLayout(1,0));
buttonpnl.add(processButton);
buttonpnl.add(saveButton);
buttonbar.add(buttonpnl);
cp.add(buttonbar,BorderLayout.SOUTH);
/* ACTION PERFORMED */
public void actionPerformed(ActionEvent event) {
if (event.getActionCommand().equals("Open File")) getFileName();
if (event.getActionCommand().equals("Read File")) readFile();
/* OPEN THE FILE */
private void getFileName() {
// Display file dialog so user can select file to open
JFileChooser fileChooser = new JFileChooser();
fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
int result = fileChooser.showOpenDialog(this);
// If cancel button selected return
if (result == JFileChooser.CANCEL_OPTION) return;
if (result == JFileChooser.APPROVE_OPTION)
fileName = fileChooser.getSelectedFile();
textfield.setText(fileName.getName());
if (checkFileName()) {
openButton.setEnabled(false);
readButton.setEnabled(true);
// Obtain selected file
/* READ FILE */
private void readFile() {
// Disable read button
readButton.setEnabled(false);
// Dimension data structure
getNumberOfLines();
data = new String[numLines][];
// Read file
readTheFile();
// Output to text area
textArea.setText(data[0][0] + "\n");
for(int index=0;index < data.length;index++)
for(int j=1;j<data[index].length;j++)
textArea.append(data[index][j] + "\n");
// Rnable open button
openButton.setEnabled(true);
/* GET NUMBER OF LINES */
/* Get number of lines in file and prepare data structure. */
private void getNumberOfLines() {
int counter = 0;
// Open the file
openFile();
// Loop through file incrementing counter
try {
String line = fileInput.readLine();
while (line != null) {
counter++;
System.out.println("(" + counter + ") " + line);
line = fileInput.readLine();
numLines = counter;
closeFile();
catch(IOException ioException) {
JOptionPane.showMessageDialog(this,"Error reading File",
"Error 5: ",JOptionPane.ERROR_MESSAGE);
closeFile();
System.exit(1);
/* READ FILE */
private void readTheFile() {
// Open the file
int row=0;
int col=0;
openFile();
System.out.println("Read the file");
// Loop through file incrementing counter
try {
String line = fileInput.readLine();
while (line != null)
StringTokenizer st=new StringTokenizer(line);
while(st.hasMoreTokens())
data[row][col]=st.nextToken();
System.out.println(data[row][col]);
col++;
row++;
closeFile();
catch(IOException ioException) {
JOptionPane.showMessageDialog(this,"Error reading File",
"Error 5: ",JOptionPane.ERROR_MESSAGE);
closeFile();
System.exit(1);
/* CHECK FILE NAME */
/* Return flase if selected file is a directory, access is denied or is
not a file name. */
private boolean checkFileName() {
if (fileName.exists()) {
if (fileName.canRead()) {
if (fileName.isFile()) return(true);
else JOptionPane.showMessageDialog(null,
"ERROR 3: File is a directory");
else JOptionPane.showMessageDialog(null,
"ERROR 2: Access denied");
else JOptionPane.showMessageDialog(null,
"ERROR 1: No such file!");
// Return
return(false);
/* FILE HANDLING UTILITIES */
/* OPEN FILE */
private void openFile() {
try {
// Open file
FileReader file = new FileReader(fileName);
fileInput = new BufferedReader(file);
catch(IOException ioException) {
JOptionPane.showMessageDialog(this,"Error Opening File",
"Error 4: ",JOptionPane.ERROR_MESSAGE);
System.out.println("File opened");
/* CLOSE FILE */
private void closeFile() {
if (fileInput != null) {
try {
fileInput.close();
catch (IOException ioException) {
JOptionPane.showMessageDialog(this,"Error Opening File",
"Error 4: ",JOptionPane.ERROR_MESSAGE);
System.out.println("File closed");
/* MAIN METHOD */
/* MAIN METHOD */
public static void main(String[] args) throws IOException {
// Create instance of class FileChooser
FileReduction1 newFile = new FileReduction1("File Reduction Program");
// Make window vissible
newFile.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
newFile.setSize(500,400);
newFile.setVisible(true);
Java.lang.NullpointException
at FileReductoin1.readTheFile <FileReduction1.java :172>
at FileReductoin1.readFile <FileReduction1.java :110>
at FileReductoin1.actionPerformed <FileReduction1.java :71>
.1) Next time use the CODE tags. this is way too much unreadable crap.
2) The problem is your String[][] data.... the only place I see you do anything approching initializing it is
data = new String[numLines][];I think you want to do this..
data = new String[numLines][3];anyway that's why it's blowing up on the line
data[row][col]=st.nextToken(); -
Hi,
Direction on how to read a text file consisting of rows and columns with 1's and 0's into a GUI would be useful.
I can ask user for filename and display the file in a DOS window but unsure of how I would use a text box to ask for a filename and then display the contents of it into the GUI.
Im fairly new to Java, Where do I start?
Thanks.Alternatively, take a look at this:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
class Editor extends JFrame
private BorderLayout borderLayout1 = new BorderLayout();
private JScrollPane jScrollPane1 = new JScrollPane();
private JTextArea jTextArea1 = new JTextArea();
private JMenuBar jMenuBar1 = new JMenuBar();
private JMenu jMenu1 = new JMenu();
private JMenuItem jMenuItem1 = new JMenuItem();
private JMenuItem jMenuItem2 = new JMenuItem();
public static void main(String[] args)
Editor editor=new Editor();
editor.setBounds(100,100,400,400);
editor.setVisible(true);
public Editor()
try
jbInit();
catch(Exception e)
e.printStackTrace();
this.pack();
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
private void jbInit() throws Exception
this.getContentPane().setLayout(borderLayout1);
this.setJMenuBar(jMenuBar1);
jMenu1.setText("File");
jMenuItem1.setText("Open");
jMenuItem1.addActionListener(new java.awt.event.ActionListener()
public void actionPerformed(ActionEvent e)
jMenuItem1_actionPerformed(e);
jMenuItem2.setText("Save");
jMenuItem2.addActionListener(new java.awt.event.ActionListener()
public void actionPerformed(ActionEvent e)
jMenuItem2_actionPerformed(e);
this.getContentPane().add(jScrollPane1, BorderLayout.CENTER);
jScrollPane1.getViewport().add(jTextArea1, null);
jMenuBar1.add(jMenu1);
jMenu1.add(jMenuItem1);
jMenu1.add(jMenuItem2);
void jMenuItem1_actionPerformed(ActionEvent e)
JFileChooser fileSelectDialog=new JFileChooser();
fileSelectDialog.setDialogTitle("Open file");
fileSelectDialog.setFileSelectionMode(JFileChooser.FILES_ONLY);
fileSelectDialog.setCurrentDirectory(new File("."));
int result=fileSelectDialog.showDialog(this, null);
if(result==fileSelectDialog.APPROVE_OPTION)
File file=fileSelectDialog.getSelectedFile();
if(file!=null)
try
FileInputStream fileInputStream=new FileInputStream(file);
byte[] data=new byte[(int)file.length()];
fileInputStream.read(data);
jTextArea1.setText(new String(data));
catch(IOException ex)
showExceptionMessage(ex);
void jMenuItem2_actionPerformed(ActionEvent e)
JFileChooser fileSelectDialog=new JFileChooser();
fileSelectDialog.setDialogTitle("Save file");
fileSelectDialog.setDialogType(JFileChooser.SAVE_DIALOG);
fileSelectDialog.setFileSelectionMode(JFileChooser.FILES_ONLY);
fileSelectDialog.setCurrentDirectory(new File("."));
int result=fileSelectDialog.showDialog(this, null);
if(result==fileSelectDialog.APPROVE_OPTION)
File file=fileSelectDialog.getSelectedFile();
if(file!=null)
try
FileOutputStream fileOutputStream=new FileOutputStream(file,false);
fileOutputStream.write(jTextArea1.getText().getBytes());
catch(IOException ex)
showExceptionMessage(ex);
public void showExceptionMessage(Exception ex)
StringWriter stringWriter=new StringWriter();
PrintWriter printWriter=new PrintWriter(stringWriter);
ex.printStackTrace(printWriter);
JOptionPane.showMessageDialog(this,stringWriter.toString().replace('\t',' ').replace('\r',' '),"Exception!",JOptionPane.ERROR_MESSAGE);
} -
HOW TO READ TXT FILES with NOKIA 6300?
I mean:
I can see pics, video, listen mp3 but I cant read a txt file with Nokia 6300!!
is there any application to do so? thanks!!!!!!!thanks well I tried 4 s far and none works.
I tried: book_13, read_maniac, tiny-book, plus MobileHeart.com-test-book-831-2336.jar.
it starts being frustrating.
Can you suggest one you tested it works?
-Also, I found that I cant' upload txt file while I can upload *.doc files.....do you know what's happening?
thanks again. -
How to read binary file into a 2D float array??
Hi All,
I really need help to get this one as I am stuck and can't seem to find any way out of it. I am given a '.dat' file that has float values in it. I want to read this file in java and put it in a 2D float array. The file has basically a matrix of float values. What I want to do is to read this binary file and put all its data into 2D float array (float [] []) so that I can use it in my program. Is there a way to read file like this? I did find a similar matlab code (below) but cant seem to find anything in java and i really want to do this in java only.. I will appreciate ur help in this one.
thanks very much
Nitya
fid = fopen('datafile.dat');
A = fread(fid,[50 50],'float32');
fclose(fid);I shud have shown the two ways that i Already tried. here they are..
first one using DataInputStream and then trying to readFloat()
DataInputStream dis = ....
Float f = dis.readFloat();This code gives code gives me some random values like this.. (i had a loop)
5.8758974E-14
-0.41055492
1.5724557E-30
1.06822824E14
-1.91934371E15
3.43829601E13
Other way i tried was this.. which seems right but here i have to convert byte to float and i thnk that code is giving some different results (slightly different float values) not sure why....may be my indexing of the array is wrong to make it a matrix.. or something else...
is.read(bytes, offset....);
int cnt = 0;
int j = 0;
for (int start = 0; start < offset; start = start + 4) {
if(j<50){
myarray[cnt][j] = this.arr2float(bytes, start);
System.out.println(cnt + "-" + j + " = " + myarray[cnt][j]);
j++;
}else{
if(cnt < 50){
cnt++;
j = 0;
}else{
break;
public float arr2float (byte[] arr, int start) {
int i = 0;
int len = 4;
int cnt = 0;
byte[] tmp = new byte[len];
for (i = start; i < (start + len); i++) {
tmp[cnt] = arr;
cnt++;
int accum = 0;
i = 0;
for ( int shiftBy = 0; shiftBy < 32; shiftBy += 8 ) {
accum |= ( (long)( tmp[i] & 0xff ) ) << shiftBy;
i++;
return Float.intBitsToFloat(accum);
Not sure if i am missing some other way to do this... -
I have to make a class in java that searches for information on a text file.
My text file is described below.
username=Hanako Sony
cpname=Sony Corporation
cpcode=500100
So, if the user inputs "username", then "Hanako Sony" should be returned. If the user inputs "cpname", then "Sony Corporation" should be returned and so on.
Can anyone help me with this?
Thanks,
RobTry this:
import java.io.*;
import java.util.*;
public class Tread
BufferedReader reader;
Vector wl = new Vector();
public Tread()
try
reader = new BufferedReader(new FileReader("file.txt"));
catch(FileNotFoundException e)
System.out.println(""+e);
String s = null;
try
while( (s = reader.readLine()) != null)
wl.add(s);
System.out.println(s);
reader.close();
catch (IOException e)
System.out.println(""+e);
String su = ". ";
BufferedReader keyboard = new BufferedReader(new InputStreamReader(System.in));
while (!su.equals(""))
try
System.out.println("What to look for ?");
su = keyboard.readLine();
search(su);
catch(Exception e){}
public void search(String su)
String si;
int p;
for (int i=0; i < wl.size(); i++)
si = (String)wl.elementAt(i);
p = si.indexOf("=");
if (p > 0 && si.substring(0,p).equals(su))
show(si.substring(p+1));
public void show(String so)
StringTokenizer st = new StringTokenizer(so,"|");
while (st.hasMoreElements())
System.out.println(st.nextElement());
public static void main(String[] args)
new Tread();
Noah -
How to read *.txt files with JSP?
I have to make a homepage that searches for information on a text file.
My text file is described below.
username=Hanako Sony
cpname=Sony Corporation
cpcode=500100
So, if the user inputs "username", then "Hanako Sony" should be returned. If the user inputs "cpname", then "Sony Corporation" should be returned and so on.
Can anyone help me with this? Can this be done with JSP?
Thanks,
RobTry this,
<%@ page import="java.io.*,java.util.*" %>
<%
RandomAccessFile raf = new RandomAccessFile("../webapps/test/jsp/Info.txt","r");
String qInfo = request.getParameter("qInfo");
String tInfo="";
if(qInfo != null) {
String line="";
while((line = raf.readLine()) != null) {
StringTokenizer st = new StringTokenizer(line,"=");
if(st.hasMoreTokens()) {
if(st.nextToken().equalsIgnoreCase(qInfo))
tInfo = st.nextToken();
if(tInfo.equals("")) tInfo="Property Not found ???";
} else {
qInfo="";
%>
<form name=myform action="" method="get">
<table><tr>
<td>What do you want : </td><td><input type = text name="qInfo" value="<%=qInfo%>"></td></tr>
<tr><td>Here is the information : </td><td><input type = text name="tInfo" value="<%=tInfo%>"></td></tr>
<tr><td><input type="submit" name"sub"></td></tr>
</table>
</form>Here info.txt is your text file. Use the relative path accordingly.
Hope this helps.
Sudha -
Hello friends,
Any buddy knows how to add ".txt" files into ".zip" format through the ABAP code.
Thanks in advance.Hi Murali,
You can use the method in the class CL_ABAP_GZIP to zip your file and then download it using GUI_DOWNLOAD.
data: zip type ref to cl_abap_zip,
result type xstring.
create object zip.
zip->add( name = some_file content = content ).
result = zip->save( ).
Also you can check this thread as well.
How to Download data in Zip folder
Re: UNZIP file from ABAP
Hope this will help.
Regards,
Ferry Lianto
Please reward points if helpful. -
How can I load a .TXT file into a dynamic text box?
I am sure that many people know how to load a .txt file into
a dynamic text box. But I do not. I want to be able to reference a
txt file from the server into the text box. So that when I change
the text file it changes in the flash movie without even editing
the flash file itself. Thank you.http://www.oman3d.com/tutorials/flash/loading_external_text_bc/
I think this is the simplest way to go :) -
Reading entire txt file into memory?
When you are using BufferedReader to read info into a buffer, that means you are reading the file into memory, correct? (Is that what buffer means?)
I want to look for pattern matches in text files (about 1000 of them) using the regex utils. But I don't want to read and examine the text files line by line. I want to read in the entire text file into memory first and then look for the pattern matches. The text files generally don't exceed about 15K in size. I'm only going one file at a time, too, so this won't give me any out of memory errors, will it?
And more importantly, how do I do it? I mean the "reading in the file" part only. I have my RegEx, I have my array of files to examine already. I just can't figure out the right code to use to read each file into memory before I look for pattern matches.
Could someone help, please?When you are using BufferedReader to read info into a
buffer, that means you are reading the file into
memory, correct? (Is that what buffer means?)Yes.
I want to look for pattern matches in text files
(about 1000 of them) using the regex utils. But I
don't want to read and examine the text files line by
line.Why not?
I want to read in the entire text file into
memory first and then look for the pattern matches.Why?
The text files generally don't exceed about 15K in
size. I'm only going one file at a time, too, so
this won't give me any out of memory errors, will
it?Depends on how much memory you've given the VM and how much of that it's using already at the time you read the files, but in general, probably not a problem.
And more importantly, how do I do it? I mean the
"reading in the file" part only.Use BufferedReader to read line by line and then append each line (plus a newline, since BR.readLine() strips those off) to a StringBuilder.
Or use a BufferedInputStream and and array that's as big as the file, and in a loop, try to read as much as is left into that array at an offset equal to how much has been read so far.
I still think this is probably not a good approach though.
Maybe you are looking for
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