HELP for writing a Programme that displays text.
Check the API for methods in JEditorPane. Then write and run a program that uses a JEditorPane to just display text, just text.
What should I add or delete in the following code so that it just displays TEXT.
My code is -->
WEBBROWSER>
import java.awt.*;
import java.awt.event.*;
import java.net.*;
// Java extension packages
import javax.swing.*;
import javax.swing.event.*;
public class WebBrowser extends JFrame {
private WebToolBar toolBar;
private WebBrowserPane browserPane;
// WebBrowser constructor
public WebBrowser()
{
super( "Deitel Web Browser" );
// create WebBrowserPane and WebToolBar for navigation
browserPane = new WebBrowserPane();
toolBar = new WebToolBar( browserPane );
// lay out WebBrowser components
Container contentPane = getContentPane();
contentPane.add( toolBar, BorderLayout.NORTH );
contentPane.add( new JScrollPane( browserPane ),
BorderLayout.CENTER );
}
// execute application
public static void main( String args[] )
{
WebBrowser browser = new WebBrowser();
browser.setDefaultCloseOperation( EXIT_ON_CLOSE );
browser.setSize( 640, 480 );
browser.setVisible( true );
} // end main
} // end class WebBrowser
WebPane.java
// WebBrowserPane.java
// WebBrowserPane is a simple Web-browsing component that
// extends JEditorPane and maintains a history of visited URLs.
package browser;
// Java core packages
import java.util.*;
import java.net.*;
import java.io.*;
// Java extension packages
import javax.swing.*;
import javax.swing.event.*;
public class WebBrowserPane extends JEditorPane {
private List history = new ArrayList();
private int historyIndex;
// WebBrowserPane constructor
public WebBrowserPane()
{
// disable editing to enable hyperlinks
setEditable( false );
}
// display given URL and add it to history
public void goToURL( URL url )
{
displayPage( url );
history.add( url );
historyIndex = history.size() - 1;
}
// display next history URL in editorPane
public URL forward()
{
historyIndex++;
// do not go past end of history
if ( historyIndex >= history.size() )
historyIndex = history.size() - 1;
URL url = ( URL ) history.get( historyIndex );
displayPage( url );
return url;
}
// display previous history URL in editorPane
public URL back()
{
historyIndex--;
// do not go past beginning of history
if ( historyIndex < 0 )
historyIndex = 0;
// display previous URL
URL url = ( URL ) history.get( historyIndex );
displayPage( url );
return url;
}
// display given URL in JEditorPane
private void displayPage( URL pageURL )
{
// display URL
try {
setPage( pageURL );
}
// handle exception reading from URL
catch ( IOException ioException ) {
ioException.printStackTrace();
}
}
}
WebPAne.java
// WebToolBar.java
// WebToolBar is a JToolBar subclass that contains components
// for navigating a WebBrowserPane. WebToolBar includes back
// and forward buttons and a text field for entering URLs.
package browser;
// Java core packages
import java.awt.*;
import java.awt.event.*;
import java.net.*;
// Java extension packages
import javax.swing.*;
import javax.swing.event.*;
public class WebToolBar extends JToolBar
implements HyperlinkListener {
private WebBrowserPane webBrowserPane;
private JButton backButton;
private JButton forwardButton;
private JTextField urlTextField;
// WebToolBar constructor
public WebToolBar( WebBrowserPane browser )
{
super( "Web Navigation" );
// register for HyperlinkEvents
webBrowserPane = browser;
webBrowserPane.addHyperlinkListener( this );
// create JTextField for entering URLs
urlTextField = new JTextField( 25 );
urlTextField.addActionListener(
new ActionListener() {
// navigate webBrowser to user-entered URL
public void actionPerformed( ActionEvent event )
{
// attempt to load URL in webBrowserPane
try {
URL url = new URL( urlTextField.getText() );
webBrowserPane.goToURL( url );
}
// handle invalid URL
catch ( MalformedURLException urlException ) {
urlException.printStackTrace();
}
}
}
);
// create JButton for navigating to previous history URL
backButton = new JButton( new ImageIcon(
getClass().getResource( "images/back.gif" ) ) );
//backButton = new JButton( "Back");
backButton.addActionListener(
new ActionListener() {
public void actionPerformed( ActionEvent event )
{
// navigate to previous URL
URL url = webBrowserPane.back();
// display URL in urlTextField
urlTextField.setText( url.toString() );
}
}
);
// create JButton for navigating to next history URL
forwardButton = new JButton( new ImageIcon(
getClass().getResource( "images/forward.gif" ) ) );
//forwardButton = new JButton("Fwd");
forwardButton.addActionListener(
new ActionListener() {
public void actionPerformed( ActionEvent event )
{
// navigate to next URL
URL url = webBrowserPane.forward();
// display new URL in urlTextField
urlTextField.setText( url.toString() );
}
}
);
// add JButtons and JTextField to WebToolBar
add( backButton );
add( forwardButton );
add( urlTextField );
} // end WebToolBar constructor
// listen for HyperlinkEvents in WebBrowserPane
public void hyperlinkUpdate( HyperlinkEvent event )
{
// if hyperlink was activated, go to hyperlink's URL
if ( event.getEventType() ==
HyperlinkEvent.EventType.ACTIVATED ) {
// get URL from HyperlinkEvent
URL url = event.getURL();
// navigate to URL and display URL in urlTextField
webBrowserPane.goToURL( url );
urlTextField.setText( url.toString() );
}
}
}
-
Please REPLY.
WEBBROWSER>
import java.awt.*;
import java.awt.event.*;
import java.net.*;
// Java extension packages
import javax.swing.*;
import javax.swing.event.*;
public class WebBrowser extends JFrame {
private WebToolBar toolBar;
private WebBrowserPane browserPane;
// WebBrowser constructor
public WebBrowser()
{
super( "Deitel Web Browser" );
// create WebBrowserPane and WebToolBar for navigation
browserPane = new WebBrowserPane();
toolBar = new WebToolBar( browserPane );
// lay out WebBrowser components
Container contentPane = getContentPane();
contentPane.add( toolBar, BorderLayout.NORTH );
contentPane.add( new JScrollPane( browserPane ),
BorderLayout.CENTER );
}
// execute application
public static void main( String args[] )
{
WebBrowser browser = new WebBrowser();
browser.setDefaultCloseOperation( EXIT_ON_CLOSE );
browser.setSize( 640, 480 );
browser.setVisible( true );
} // end main
} // end class WebBrowser
WebPane.java
// WebBrowserPane.java
// WebBrowserPane is a simple Web-browsing component that
// extends JEditorPane and maintains a history of visited URLs.
package browser;
// Java core packages
import java.util.*;
import java.net.*;
import java.io.*;
// Java extension packages
import javax.swing.*;
import javax.swing.event.*;
public class WebBrowserPane extends JEditorPane {
private List history = new ArrayList();
private int historyIndex;
// WebBrowserPane constructor
public WebBrowserPane()
{
// disable editing to enable hyperlinks
setEditable( false );
}
// display given URL and add it to history
public void goToURL( URL url )
{
displayPage( url );
history.add( url );
historyIndex = history.size() - 1;
}
// display next history URL in editorPane
public URL forward()
{
historyIndex++;
// do not go past end of history
if ( historyIndex >= history.size() )
historyIndex = history.size() - 1;
URL url = ( URL ) history.get( historyIndex );
displayPage( url );
return url;
}
// display previous history URL in editorPane
public URL back()
{
historyIndex--;
// do not go past beginning of history
if ( historyIndex < 0 )
historyIndex = 0;
// display previous URL
URL url = ( URL ) history.get( historyIndex );
displayPage( url );
return url;
}
// display given URL in JEditorPane
private void displayPage( URL pageURL )
{
// display URL
try {
setPage( pageURL );
}
// handle exception reading from URL
catch ( IOException ioException ) {
ioException.printStackTrace();
}
}
}
WebPAne.java
// WebToolBar.java
// WebToolBar is a JToolBar subclass that contains components
// for navigating a WebBrowserPane. WebToolBar includes back
// and forward buttons and a text field for entering URLs.
package browser;
// Java core packages
import java.awt.*;
import java.awt.event.*;
import java.net.*;
// Java extension packages
import javax.swing.*;
import javax.swing.event.*;
public class WebToolBar extends JToolBar
implements HyperlinkListener {
private WebBrowserPane webBrowserPane;
private JButton backButton;
private JButton forwardButton;
private JTextField urlTextField;
// WebToolBar constructor
public WebToolBar( WebBrowserPane browser )
{
super( "Web Navigation" );
// register for HyperlinkEvents
webBrowserPane = browser;
webBrowserPane.addHyperlinkListener( this );
// create JTextField for entering URLs
urlTextField = new JTextField( 25 );
urlTextField.addActionListener(
new ActionListener() {
// navigate webBrowser to user-entered URL
public void actionPerformed( ActionEvent event )
{
// attempt to load URL in webBrowserPane
try {
URL url = new URL( urlTextField.getText() );
webBrowserPane.goToURL( url );
}
// handle invalid URL
catch ( MalformedURLException urlException ) {
urlException.printStackTrace();
}
}
}
);
// create JButton for navigating to previous history URL
backButton = new JButton( new ImageIcon(
getClass().getResource( "images/back.gif" ) ) );
//backButton = new JButton( "Back");
backButton.addActionListener(
new ActionListener() {
public void actionPerformed( ActionEvent event )
{
// navigate to previous URL
URL url = webBrowserPane.back();
// display URL in urlTextField
urlTextField.setText( url.toString() );
}
}
);
// create JButton for navigating to next history URL
forwardButton = new JButton( new ImageIcon(
getClass().getResource( "images/forward.gif" ) ) );
//forwardButton = new JButton("Fwd");
forwardButton.addActionListener(
new ActionListener() {
public void actionPerformed( ActionEvent event )
{
// navigate to next URL
URL url = webBrowserPane.forward();
// display new URL in urlTextField
urlTextField.setText( url.toString() );
}
}
);
// add JButtons and JTextField to WebToolBar
add( backButton );
add( forwardButton );
add( urlTextField );
} // end WebToolBar constructor
// listen for HyperlinkEvents in WebBrowserPane
public void hyperlinkUpdate( HyperlinkEvent event )
{
// if hyperlink was activated, go to hyperlink's URL
if ( event.getEventType() ==
HyperlinkEvent.EventType.ACTIVATED ) {
// get URL from HyperlinkEvent
URL url = event.getURL();
// navigate to URL and display URL in urlTextField
webBrowserPane.goToURL( url );
urlTextField.setText( url.toString() );
}
}
}
PLEASE HELP ME IN THIS TOPIC
> What should I add or delete in the following code so> that it just displays TEXT.USE THE SETTEXT() METHOD.
But where to use settext() method ?which methods in the api should I delete.
I'd strongly advise against deleting methods from the API.
What should I do inorder to solve my problem?The PROBLEM is to Check the API for methods in JEditorPane. Then write and run a program that uses a JEditorPane to just display text, just text.
> What should I do inorder to solve my problem?The
> PROBLEM is to Check the API for methods in
> JEditorPane. Then write and run a program that uses
> a JEditorPane to just display text, just text.
So why don't you check the API and search through the methods like the assignment says?
Please guide me ,I am checking for the methods in the API.Some DIECTION got to be there.
> Some DIECTION got to be there.I already told you to look at the setText() method.
By setText() method you mean I should add this method in the JEditorPane.Also I shouldnot delete any method from the API rather I shud add this method setText().
> By setText() method you mean I should add this method
> in the JEditorPane.Also I shouldnot delete any method
> from the API rather I shud add this method setText().
setText() is an existing method in the JEditorPane class. You do not need to create any new methods.
I am aware of the setText () method .By adding the new setText() method I mean that should i make another setText() method and add some text in this method and display the text.Please let me know the answer.
Please let me know I really need some guidance to complete this programme.
> The PROBLEM is to Check the API for methods in JEditorPane. Then
> write and run a program that uses a JEditorPane to just display text, just text.
Then read the API. In the API description you will find a link to the Swing tutorial on "Using Text Components" which has a working example of how to use a JEditorPane.
Get rid of all the code related to next, previous functionality. Get the basicis working first and then add in additional functionality. You don't write the whole program first when you don't even know hot to do the basics. So go back to the drawing board and create a SSCCE. You should be able to do what you want in about 10 lines of code or less.
If you need further help then you need to create a [url http://homepage1.nifty.com/algafield/sscce.html]Short, Self Contained, Compilable and Executable, Example Program[/url] (SSCCE) that demonstrates the incorrect behaviour, because I can't guess exactly what you are doing based on the information provided.
And don't forget to use the [url http://forum.java.sun.com/help.jspa?sec=formatting]Code Formatting Tags[/url] so the code retains its original formatting.
My problem is that I am not getting to the point that how can I simply display the TEXT from the WEBPAGE nothing else.That is why I am confused what should I do in the programme.Please if you could guide me some way I will be thankful to you
> how can I simply display the TEXT from the WEBPAGE nothing else.I guess you are asking how to parse out the text and ignore all the HTML tags. If so the see this posting: http://forum.java.sun.com/thread.jspa?forumID=57&threadID=637059
Actually I have to just print the text of the website as I have already created the webbrowser.The thing is which method should I omit so that only TEXT will be displayed.If you can have a look plzz help me.
WEBBROWSER>
import java.awt.*;
import java.awt.event.*;
import java.net.*;
// Java extension packages
import javax.swing.*;
import javax.swing.event.*;
public class WebBrowser extends JFrame {
private WebToolBar toolBar;
private WebBrowserPane browserPane;
// WebBrowser constructor
public WebBrowser()
{
super( "Deitel Web Browser" );
// create WebBrowserPane and WebToolBar for navigation
browserPane = new WebBrowserPane();
toolBar = new WebToolBar( browserPane );
// lay out WebBrowser components
Container contentPane = getContentPane();
contentPane.add( toolBar, BorderLayout.NORTH );
contentPane.add( new JScrollPane( browserPane ),
BorderLayout.CENTER );
}
// execute application
public static void main( String args[] )
{
WebBrowser browser = new WebBrowser();
browser.setDefaultCloseOperation( EXIT_ON_CLOSE );
browser.setSize( 640, 480 );
browser.setVisible( true );
} // end main
} // end class WebBrowser
WebPane.java
// WebBrowserPane.java
// WebBrowserPane is a simple Web-browsing component that
// extends JEditorPane and maintains a history of visited URLs.
package browser;
// Java core packages
import java.util.*;
import java.net.*;
import java.io.*;
// Java extension packages
import javax.swing.*;
import javax.swing.event.*;
public class WebBrowserPane extends JEditorPane {
private List history = new ArrayList();
private int historyIndex;
// WebBrowserPane constructor
public WebBrowserPane()
{
// disable editing to enable hyperlinks
setEditable( false );
}
// display given URL and add it to history
public void goToURL( URL url )
{
displayPage( url );
history.add( url );
historyIndex = history.size() - 1;
}
// display next history URL in editorPane
public URL forward()
{
historyIndex++;
// do not go past end of history
if ( historyIndex >= history.size() )
historyIndex = history.size() - 1;
URL url = ( URL ) history.get( historyIndex );
displayPage( url );
return url;
}
// display previous history URL in editorPane
public URL back()
{
historyIndex--;
// do not go past beginning of history
if ( historyIndex < 0 )
historyIndex = 0;
// display previous URL
URL url = ( URL ) history.get( historyIndex );
displayPage( url );
return url;
}
// display given URL in JEditorPane
private void displayPage( URL pageURL )
{
// display URL
try {
setPage( pageURL );
}
// handle exception reading from URL
catch ( IOException ioException ) {
ioException.printStackTrace();
}
}
}
WebPAne.java
// WebToolBar.java
// WebToolBar is a JToolBar subclass that contains components
// for navigating a WebBrowserPane. WebToolBar includes back
// and forward buttons and a text field for entering URLs.
package browser;
// Java core packages
import java.awt.*;
import java.awt.event.*;
import java.net.*;
// Java extension packages
import javax.swing.*;
import javax.swing.event.*;
public class WebToolBar extends JToolBar
implements HyperlinkListener {
private WebBrowserPane webBrowserPane;
private JButton backButton;
private JButton forwardButton;
private JTextField urlTextField;
// WebToolBar constructor
public WebToolBar( WebBrowserPane browser )
{
super( "Web Navigation" );
// register for HyperlinkEvents
webBrowserPane = browser;
webBrowserPane.addHyperlinkListener( this );
// create JTextField for entering URLs
urlTextField = new JTextField( 25 );
urlTextField.addActionListener(
new ActionListener() {
// navigate webBrowser to user-entered URL
public void actionPerformed( ActionEvent event )
{
// attempt to load URL in webBrowserPane
try {
URL url = new URL( urlTextField.getText() );
webBrowserPane.goToURL( url );
}
// handle invalid URL
catch ( MalformedURLException urlException ) {
urlException.printStackTrace();
}
}
}
);
// create JButton for navigating to previous history URL
backButton = new JButton( new ImageIcon(
getClass().getResource( "images/back.gif" ) ) );
//backButton = new JButton( "Back");
backButton.addActionListener(
new ActionListener() {
public void actionPerformed( ActionEvent event )
{
// navigate to previous URL
URL url = webBrowserPane.back();
// display URL in urlTextField
urlTextField.setText( url.toString() );
}
}
);
// create JButton for navigating to next history URL
forwardButton = new JButton( new ImageIcon(
getClass().getResource( "images/forward.gif" ) ) );
//forwardButton = new JButton("Fwd");
forwardButton.addActionListener(
new ActionListener() {
public void actionPerformed( ActionEvent event )
{
// navigate to next URL
URL url = webBrowserPane.forward();
// display new URL in urlTextField
urlTextField.setText( url.toString() );
}
}
);
// add JButtons and JTextField to WebToolBar
add( backButton );
add( forwardButton );
add( urlTextField );
} // end WebToolBar constructor
// listen for HyperlinkEvents in WebBrowserPane
public void hyperlinkUpdate( HyperlinkEvent event )
{
// if hyperlink was activated, go to hyperlink's URL
if ( event.getEventType() ==
HyperlinkEvent.EventType.ACTIVATED ) {
// get URL from HyperlinkEvent
URL url = event.getURL();
// navigate to URL and display URL in urlTextField
webBrowserPane.goToURL( url );
urlTextField.setText( url.toString() );
}
}
}
I showed you how to parse the text out of the webpage.
I suggested how to create a simple program to read a file into the editor pane.
I'm not going to read through hundreds of line of unnecessary code, since I obvously don't understand the question and you aren't making an effor to create a SSCCE.
