Module java.desktop
Package javax.swing

# Class JEditorPane

java.lang.Object
java.awt.Component
java.awt.Container
javax.swing.JComponent
javax.swing.text.JTextComponent
javax.swing.JEditorPane

All Implemented Interfaces:
  `ImageObserver`, `MenuContainer`, `Serializable`, `Accessible`, `Scrollable`

Direct Known Subclasses:
  `JTextPane`

@JavaBean(defaultProperty="UIClassID", description="A text component to edit various types of content.") public class JEditorPane extends JTextComponent
A text component to edit various kinds of content. You can find how-to information and examples of using editor panes in Using Text Components, a section in The Java Tutorial.

This component uses implementations of the `EditorKit` to accomplish its behavior. It effectively morphs into the proper kind of text editor for the kind of content it is given. The content type that editor is bound to at any given time is determined by the `EditorKit` currently installed. If the content is set to a new URL, its type is used to determine the `EditorKit` that should be used to load the content.

By default, the following types of content are known:

text/plain
  Plain text, which is the default the type given isn't recognized. The kit used in this case is an extension of `DefaultEditorKit` that produces a wrapped plain text view.
text/html
  HTML text. The kit used in this case is the class `javax.swing.text.html.HTMLEditorKit` which provides HTML 3.2 support.
text/rtf
  RTF text. The kit used in this case is the class `javax.swing.text.rtf.RTFEditorKit` which provides a limited support of the Rich Text Format.

There are several ways to load content into this component.

1. The `setText` method can be used to initialize the component from a string. In this case the current `EditorKit` will be used, and the content type will be expected to be of this type.
2. The `read` method can be used to initialize the component from a `Reader`. Note that if the content type is HTML, relative references (e.g. for things like images) can't be resolved unless the <base> tag is used or the Base property on `HTMLDocument` is set. In this case the current `EditorKit` will be used, and the content type will be expected to be of this type.
3. The `setPage` method can be used to initialize the component from a URL. In this case, the content type will be determined from the URL, and the registered `EditorKit` for that content type will be set.

Some kinds of content may provide hyperlink support by generating hyperlink events. The HTML `EditorKit` will generate hyperlink events if the `JEditorPane` is not editable (`JEditorPane.setEditable(false);` has been called). If HTML frames are embedded in the document, the typical response would be to change a portion of the current document. The following code fragment is a possible hyperlink listener implementation, that treats HTML frame events specially, and simply displays any other activated hyperlinks.

         class Hyperactive implements HyperlinkListener {

             public void hyperlinkUpdate(HyperlinkEvent e) {
                 if (e.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
                     JEditorPane pane = (JEditorPane) e.getSource();
                     if (e instanceof HTMLFrameHyperlinkEvent) {
                         HTMLFrameHyperlinkEvent  evt = (HTMLFrameHyperlinkEvent)e;
                         HTMLDocument doc = (HTMLDocument)pane.getDocument();
                         doc.processHTMLFrameHyperlinkEvent(evt);
                     } else {
                         try {
                             pane.setPage(e.getURL());
                         } catch (Throwable t) {
                             t.printStackTrace();
                         }
                     }
                 }
             }
         }

For information on customizing how text/html is rendered please see `W3C_LENGTH_UNITS` and `HONOR_DISPLAY_PROPERTIES`

Culturally dependent information in some documents is handled through a mechanism called character encoding. Character encoding is an unambiguous mapping of the members of a character set (letters, ideographs, digits, symbols, or control functions) to specific numeric code values. It represents the way the file is stored. Example character encodings are ISO-8859-1, ISO-8859-5, Shift-jis, Euc-jp, and UTF-8. When the file is passed to an user agent (`JEditorPane`) it is converted to the document character set (ISO-10646 aka Unicode).

There are multiple ways to get a character set mapping to happen with `JEditorPane`.

1. One way is to specify the character set as a parameter of the MIME type. This will be established by a call to the `setContentType` method. If the content is loaded by the `setPage` method the content type will have been set according to the specification of the URL. It the file is loaded directly, the content type would be expected to have been set prior to loading.
2. Another way the character set can be specified is in the document itself. This requires reading the document prior to determining the character set that is desired. To handle this, it is expected that the `EditorKit`.read operation throw a `ChangedCharSetException` which will be caught. The read is then restarted with a new Reader that uses the character set specified in the `ChangedCharSetException` (which is an `IOException`).

Newlines
  For a discussion on how newlines are handled, see DefaultEditorKit.

Warning: Swing is not thread safe. For more information see Swing's Threading Policy.

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeans has been added to the `java.beans` package. Please see `XMLEncoder`.

Since:
  1.2

- ## Nested Class Summary

  Nested Classes
  Modifier and Type
  Class
  Description
  `protected class`
  `JEditorPane.AccessibleJEditorPane`
  This class implements accessibility support for the `JEditorPane` class.
  `protected class`
  `JEditorPane.AccessibleJEditorPaneHTML`
  This class provides support for `AccessibleHypertext`, and is used in instances where the `EditorKit` installed in this `JEditorPane` is an instance of `HTMLEditorKit`.
  `protected class`
  `JEditorPane.JEditorPaneAccessibleHypertextSupport`
  What's returned by `AccessibleJEditorPaneHTML.getAccessibleText`.

  ## Nested classes/interfaces declared in class javax.swing.text.JTextComponent

  `JTextComponent.AccessibleJTextComponent, JTextComponent.DropLocation, JTextComponent.KeyBinding`

  ## Nested classes/interfaces declared in class javax.swing.JComponent

  `JComponent.AccessibleJComponent`

  ## Nested classes/interfaces declared in class java.awt.Container

  `Container.AccessibleAWTContainer`

  ## Nested classes/interfaces declared in class java.awt.Component

  `Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy`

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final String`
  `HONOR_DISPLAY_PROPERTIES`
  Key for a client property used to indicate whether the default font and foreground color from the component are used if a font or foreground color is not specified in the styled text.
  `static final String`
  `W3C_LENGTH_UNITS`
  Key for a client property used to indicate whether w3c compliant length units are used for html rendering.

  ### Fields declared in class javax.swing.text.JTextComponent

  `DEFAULT_KEYMAP, FOCUS_ACCELERATOR_KEY`

  ### Fields declared in class javax.swing.JComponent

  `listenerList, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW`

  ### Fields declared in class java.awt.Component

  `accessibleContext, BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT`

  ### Fields declared in interface java.awt.image.ImageObserver

  `ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `JEditorPane()`
  Creates a new `JEditorPane`.
  `JEditorPane(String url)`
  Creates a `JEditorPane` based on a string containing a URL specification.
  `JEditorPane(String type, String text)`
  Creates a `JEditorPane` that has been initialized to the given text.
  `JEditorPane(URL initialPage)`
  Creates a `JEditorPane` based on a specified URL for input.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `void`
  `addHyperlinkListener(HyperlinkListener listener)`
  Adds a hyperlink listener for notification of any changes, for example when a link is selected and entered.
  `protected EditorKit`
  `createDefaultEditorKit()`
  Creates the default editor kit (`PlainEditorKit`) for when the component is first created.
  `static EditorKit`
  `createEditorKitForContentType(String type)`
  Creates a handler for the given type from the default registry of editor kits.
  `void`
  `fireHyperlinkUpdate(HyperlinkEvent e)`
  Notifies all listeners that have registered interest for notification on this event type.
  `AccessibleContext`
  `getAccessibleContext()`
  Gets the AccessibleContext associated with this JEditorPane.
  `final String`
  `getContentType()`
  Gets the type of content that this editor is currently set to deal with.
  `EditorKit`
  `getEditorKit()`
  Fetches the currently installed kit for handling content.
  `static String`
  `getEditorKitClassNameForContentType(String type)`
  Returns the currently registered `EditorKit` class name for the type `type`.
  `EditorKit`
  `getEditorKitForContentType(String type)`
  Fetches the editor kit to use for the given type of content.
  `HyperlinkListener[]`
  `getHyperlinkListeners()`
  Returns an array of all the `HyperLinkListener`s added to this JEditorPane with addHyperlinkListener().
  `URL`
  `getPage()`
  Gets the current URL being displayed.
  `Dimension`
  `getPreferredSize()`
  Returns the preferred size for the `JEditorPane`.
  `boolean`
  `getScrollableTracksViewportHeight()`
  Returns true if a viewport should always force the height of this `Scrollable` to match the height of the viewport.
  `boolean`
  `getScrollableTracksViewportWidth()`
  Returns true if a viewport should always force the width of this `Scrollable` to match the width of the viewport.
  `protected InputStream`
  `getStream(URL page)`
  Fetches a stream for the given URL, which is about to be loaded by the `setPage` method.
  `String`
  `getText()`
  Returns the text contained in this `TextComponent` in terms of the content type of this editor.
  `String`
  `getUIClassID()`
  Gets the class ID for the UI.
  `protected String`
  `paramString()`
  Returns a string representation of this `JEditorPane`.
  `void`
  `read(InputStream in, Object desc)`
  This method initializes from a stream.
  `static void`
  `registerEditorKitForContentType(String type, String classname)`
  Establishes the default bindings of `type` to `classname`.
  `static void`
  `registerEditorKitForContentType(String type, String classname, ClassLoader loader)`
  Establishes the default bindings of `type` to `classname`.
  `void`
  `removeHyperlinkListener(HyperlinkListener listener)`
  Removes a hyperlink listener.
  `void`
  `replaceSelection(String content)`
  Replaces the currently selected content with new content represented by the given string.
  `void`
  `scrollToReference(String reference)`
  Scrolls the view to the given reference location (that is, the value returned by the `URL.getRef` method for the URL being displayed).
  `final void`
  `setContentType(String type)`
  Sets the type of content that this editor handles.
  `void`
  `setEditorKit(EditorKit kit)`
  Sets the currently installed kit for handling content.
  `void`
  `setEditorKitForContentType(String type, EditorKit k)`
  Directly sets the editor kit to use for the given type.
  `void`
  `setPage(String url)`
  Sets the current URL being displayed.
  `void`
  `setPage(URL page)`
  Sets the current URL being displayed.
  `void`
  `setText(String t)`
  Sets the text of this `TextComponent` to the specified content, which is expected to be in the format of the content type of this editor.

  ### Methods declared in class javax.swing.text.JTextComponent

  `addCaretListener, addKeymap, copy, cut, fireCaretUpdate, getActions, getCaret, getCaretColor, getCaretListeners, getCaretPosition, getDisabledTextColor, getDocument, getDragEnabled, getDropLocation, getDropMode, getFocusAccelerator, getHighlighter, getInputMethodRequests, getKeymap, getKeymap, getMargin, getNavigationFilter, getPreferredScrollableViewportSize, getPrintable, getScrollableBlockIncrement, getScrollableUnitIncrement, getSelectedText, getSelectedTextColor, getSelectionColor, getSelectionEnd, getSelectionStart, getText, getToolTipText, getUI, isEditable, loadKeymap, modelToView, modelToView2D, moveCaretPosition, paste, print, print, print, read, removeCaretListener, removeKeymap, restoreComposedText, saveComposedText, select, selectAll, setCaret, setCaretColor, setCaretPosition, setDisabledTextColor, setDocument, setDragEnabled, setDropMode, setEditable, setFocusAccelerator, setHighlighter, setKeymap, setMargin, setNavigationFilter, setSelectedTextColor, setSelectionColor, setSelectionEnd, setSelectionStart, setUI, updateUI, viewToModel, viewToModel2D, write`

  ### Methods declared in class javax.swing.JComponent

  `addAncestorListener, addNotify, addVetoableChangeListener, computeVisibleRect, contains, createToolTip, disable, enable, firePropertyChange, firePropertyChange, fireVetoableChange, getActionForKeyStroke, getActionMap, getAlignmentX, getAlignmentY, getAncestorListeners, getAutoscrolls, getBaseline, getBaselineResizeBehavior, getBorder, getBounds, getClientProperty, getComponentGraphics, getComponentPopupMenu, getConditionForKeyStroke, getDebugGraphicsOptions, getDefaultLocale, getFontMetrics, getGraphics, getHeight, getInheritsPopupMenu, getInputMap, getInputMap, getInputVerifier, getInsets, getInsets, getListeners, getLocation, getMaximumSize, getMinimumSize, getNextFocusableComponent, getPopupLocation, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getTopLevelAncestor, getTransferHandler, getVerifyInputWhenFocusTarget, getVetoableChangeListeners, getVisibleRect, getWidth, getX, getY, grabFocus, hide, isDoubleBuffered, isLightweightComponent, isManagingFocus, isOpaque, isOptimizedDrawingEnabled, isPaintingForPrint, isPaintingOrigin, isPaintingTile, isRequestFocusEnabled, isValidateRoot, paint, paintBorder, paintChildren, paintComponent, paintImmediately, paintImmediately, print, printAll, printBorder, printChildren, printComponent, processComponentKeyEvent, processKeyBinding, processKeyEvent, processMouseEvent, processMouseMotionEvent, putClientProperty, registerKeyboardAction, registerKeyboardAction, removeAncestorListener, removeNotify, removeVetoableChangeListener, repaint, repaint, requestDefaultFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, resetKeyboardActions, reshape, revalidate, scrollRectToVisible, setActionMap, setAlignmentX, setAlignmentY, setAutoscrolls, setBackground, setBorder, setComponentPopupMenu, setDebugGraphicsOptions, setDefaultLocale, setDoubleBuffered, setEnabled, setFocusTraversalKeys, setFont, setForeground, setInheritsPopupMenu, setInputMap, setInputVerifier, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPreferredSize, setRequestFocusEnabled, setToolTipText, setTransferHandler, setUI, setVerifyInputWhenFocusTarget, setVisible, unregisterKeyboardAction, update`

  ### Methods declared in class java.awt.Container

  `add, add, add, add, add, addContainerListener, addImpl, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getLayout, getMousePosition, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, preferredSize, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, setComponentZOrder, setFocusCycleRoot, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setLayout, transferFocusDownCycle, validate, validateTree`

  ### Methods declared in class java.awt.Component

  `action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, createImage, createImage, createVolatileImage, createVolatileImage, disableEvents, dispatchEvent, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getForeground, getGraphicsConfiguration, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getKeyListeners, getLocale, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hasFocus, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, requestFocus, requestFocus, requestFocusInWindow, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, setLocation, setLocation, setMixingCutoutShape, setName, setSize, setSize, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle`

  ### Methods declared in class java.lang.Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- ## Field Details

  - ### W3C_LENGTH_UNITS

    public static final String W3C_LENGTH_UNITS
    Key for a client property used to indicate whether w3c compliant length units are used for html rendering.

    By default this is not enabled; to enable it set the client `property` with this name to `Boolean.TRUE`.

    Since:
      1.5
    See Also:
      - Constant Field Values

  - ### HONOR_DISPLAY_PROPERTIES

    public static final String HONOR_DISPLAY_PROPERTIES
    Key for a client property used to indicate whether the default font and foreground color from the component are used if a font or foreground color is not specified in the styled text.

    The default varies based on the look and feel; to enable it set the client `property` with this name to `Boolean.TRUE`.

    Since:
      1.5
    See Also:
      - Constant Field Values

- ## Constructor Details

  - ### JEditorPane

    public JEditorPane()
    Creates a new `JEditorPane`. The document model is set to `null`.

  - ### JEditorPane

    public JEditorPane(URL initialPage) throws IOException
    Creates a `JEditorPane` based on a specified URL for input.
    Parameters:
      `initialPage` - the URL
    Throws:
      `IOException` - if the URL is `null` or cannot be accessed

  - ### JEditorPane

    public JEditorPane(String url) throws IOException
    Creates a `JEditorPane` based on a string containing a URL specification.
    Parameters:
      `url` - the URL
    Throws:
      `IOException` - if the URL is `null` or cannot be accessed

  - ### JEditorPane

    public JEditorPane(String type, String text)
    Creates a `JEditorPane` that has been initialized to the given text. This is a convenience constructor that calls the `setContentType` and `setText` methods.
    Parameters:
      `type` - mime type of the given text
      `text` - the text to initialize with; may be `null`
    Throws:
      `NullPointerException` - if the `type` parameter is `null`

- ## Method Details

  - ### addHyperlinkListener

    public void addHyperlinkListener(HyperlinkListener listener)
    Adds a hyperlink listener for notification of any changes, for example when a link is selected and entered.
    Parameters:
      `listener` - the listener

  - ### removeHyperlinkListener

    public void removeHyperlinkListener(HyperlinkListener listener)
    Removes a hyperlink listener.
    Parameters:
      `listener` - the listener

  - ### getHyperlinkListeners

    @BeanProperty(bound=false) public HyperlinkListener[] getHyperlinkListeners()
    Returns an array of all the `HyperLinkListener`s added to this JEditorPane with addHyperlinkListener().
    Returns:
      all of the `HyperLinkListener`s added or an empty array if no listeners have been added
    Since:
      1.4

  - ### fireHyperlinkUpdate

    public void fireHyperlinkUpdate(HyperlinkEvent e)
    Notifies all listeners that have registered interest for notification on this event type. This is normally called by the currently installed `EditorKit` if a content type that supports hyperlinks is currently active and there was activity with a link. The listener list is processed last to first.
    Parameters:
      `e` - the event
    See Also:
      - `EventListenerList`

  - ### setPage

    @BeanProperty(expert=true, description="the URL used to set content") public void setPage(URL page) throws IOException
    Sets the current URL being displayed. The content type of the pane is set, and if the editor kit for the pane is non-`null`, then a new default document is created and the URL is read into it. If the URL contains and reference location, the location will be scrolled to by calling the `scrollToReference` method. If the desired URL is the one currently being displayed, the document will not be reloaded. To force a document reload it is necessary to clear the stream description property of the document. The following code shows how this can be done:

           Document doc = jEditorPane.getDocument();
           doc.putProperty(Document.StreamDescriptionProperty, null);

    If the desired URL is not the one currently being displayed, the `getStream` method is called to give subclasses control over the stream provided.

    This may load either synchronously or asynchronously depending upon the document returned by the `EditorKit`. If the `Document` is of type `AbstractDocument` and has a value returned by `AbstractDocument.getAsynchronousLoadPriority` that is greater than or equal to zero, the page will be loaded on a separate thread using that priority.

    If the document is loaded synchronously, it will be filled in with the stream prior to being installed into the editor with a call to `setDocument`, which is bound and will fire a property change event. If an `IOException` is thrown the partially loaded document will be discarded and neither the document or page property change events will be fired. If the document is successfully loaded and installed, a view will be built for it by the UI which will then be scrolled if necessary, and then the page property change event will be fired.

    If the document is loaded asynchronously, the document will be installed into the editor immediately using a call to `setDocument` which will fire a document property change event, then a thread will be created which will begin doing the actual loading. In this case, the page property change event will not be fired by the call to this method directly, but rather will be fired when the thread doing the loading has finished. It will also be fired on the event-dispatch thread. Since the calling thread can not throw an `IOException` in the event of failure on the other thread, the page property change event will be fired when the other thread is done whether the load was successful or not.

    Parameters:
      `page` - the URL of the page
    Throws:
      `IOException` - for a `null` or invalid page specification, or exception from the stream being read
    See Also:
      - `getPage()`

  - ### read

    public void read(InputStream in, Object desc) throws IOException
    This method initializes from a stream. If the kit is set to be of type `HTMLEditorKit`, and the `desc` parameter is an `HTMLDocument`, then it invokes the `HTMLEditorKit` to initiate the read. Otherwise it calls the superclass method which loads the model as plain text.
    Parameters:
      `in` - the stream from which to read
      `desc` - an object describing the stream
    Throws:
      `IOException` - as thrown by the stream being used to initialize
    See Also:
      - `JTextComponent.read(java.io.Reader, java.lang.Object)`
      - `JTextComponent.setDocument(javax.swing.text.Document)`

  - ### getStream

    protected InputStream getStream(URL page) throws IOException
    Fetches a stream for the given URL, which is about to be loaded by the `setPage` method. By default, this simply opens the URL and returns the stream. This can be reimplemented to do useful things like fetch the stream from a cache, monitor the progress of the stream, etc.

    This method is expected to have the side effect of establishing the content type, and therefore setting the appropriate `EditorKit` to use for loading the stream.

    If this the stream was an http connection, redirects will be followed and the resulting URL will be set as the `Document.StreamDescriptionProperty` so that relative URL's can be properly resolved.

    Parameters:
      `page` - the URL of the page
    Returns:
      a stream for the URL which is about to be loaded
    Throws:
      `IOException` - if an I/O problem occurs

  - ### scrollToReference

    public void scrollToReference(String reference)
    Scrolls the view to the given reference location (that is, the value returned by the `URL.getRef` method for the URL being displayed). By default, this method only knows how to locate a reference in an HTMLDocument. The implementation calls the `scrollRectToVisible` method to accomplish the actual scrolling. If scrolling to a reference location is needed for document types other than HTML, this method should be reimplemented. This method will have no effect if the component is not visible.
    Parameters:
      `reference` - the named location to scroll to

  - ### getPage

    public URL getPage()
    Gets the current URL being displayed. If a URL was not specified in the creation of the document, this will return `null`, and relative URL's will not be resolved.
    Returns:
      the URL, or `null` if none

  - ### setPage

    public void setPage(String url) throws IOException
    Sets the current URL being displayed.
    Parameters:
      `url` - the URL for display
    Throws:
      `IOException` - for a `null` or invalid URL specification

  - ### getUIClassID

    @BeanProperty(bound=false) public String getUIClassID()
    Gets the class ID for the UI.
    Overrides:
      `getUIClassID` in class `JComponent`
    Returns:
      the string "EditorPaneUI"
    See Also:
      - `JComponent.getUIClassID()`
      - `UIDefaults.getUI(javax.swing.JComponent)`

  - ### createDefaultEditorKit

    protected EditorKit createDefaultEditorKit()
    Creates the default editor kit (`PlainEditorKit`) for when the component is first created.
    Returns:
      the editor kit

  - ### getEditorKit

    public EditorKit getEditorKit()
    Fetches the currently installed kit for handling content. `createDefaultEditorKit` is called to set up a default if necessary.
    Returns:
      the editor kit

  - ### getContentType

    public final String getContentType()
    Gets the type of content that this editor is currently set to deal with. This is defined to be the type associated with the currently installed `EditorKit`.
    Returns:
      the content type, `null` if no editor kit set

  - ### setContentType

    @BeanProperty(bound=false, description="the type of content") public final void setContentType(String type)
    Sets the type of content that this editor handles. This calls `getEditorKitForContentType`, and then `setEditorKit` if an editor kit can be successfully located. This is mostly convenience method that can be used as an alternative to calling `setEditorKit` directly.

    If there is a charset definition specified as a parameter of the content type specification, it will be used when loading input streams using the associated `EditorKit`. For example if the type is specified as `text/html; charset=EUC-JP` the content will be loaded using the `EditorKit` registered for `text/html` and the Reader provided to the `EditorKit` to load unicode into the document will use the `EUC-JP` charset for translating to unicode. If the type is not recognized, the content will be loaded using the `EditorKit` registered for plain text, `text/plain`.

    Parameters:
      `type` - the non-`null` mime type for the content editing support
    Throws:
      `NullPointerException` - if the `type` parameter is `null`
    See Also:
      - `getContentType()`

  - ### setEditorKit

    @BeanProperty(expert=true, description="the currently installed kit for handling content") public void setEditorKit(EditorKit kit)
    Sets the currently installed kit for handling content. This is the bound property that establishes the content type of the editor. Any old kit is first deinstalled, then if kit is non-`null`, the new kit is installed, and a default document created for it. A `PropertyChange` event ("editorKit") is always fired when `setEditorKit` is called.

    NOTE: This has the side effect of changing the model, because the `EditorKit` is the source of how a particular type of content is modeled. This method will cause `setDocument` to be called on behalf of the caller to ensure integrity of the internal state.

    Parameters:
      `kit` - the desired editor behavior
    See Also:
      - `getEditorKit()`

  - ### getEditorKitForContentType

    public EditorKit getEditorKitForContentType(String type)
    Fetches the editor kit to use for the given type of content. This is called when a type is requested that doesn't match the currently installed type. If the component doesn't have an `EditorKit` registered for the given type, it will try to create an `EditorKit` from the default `EditorKit` registry. If that fails, a `PlainEditorKit` is used on the assumption that all text documents can be represented as plain text.

    This method can be reimplemented to use some other kind of type registry. This can be reimplemented to use the Java Activation Framework, for example.

    Parameters:
      `type` - the non-`null` content type
    Returns:
      the editor kit

  - ### setEditorKitForContentType

    public void setEditorKitForContentType(String type, EditorKit k)
    Directly sets the editor kit to use for the given type. A look-and-feel implementation might use this in conjunction with `createEditorKitForContentType` to install handlers for content types with a look-and-feel bias.
    Parameters:
      `type` - the non-`null` content type
      `k` - the editor kit to be set

  - ### replaceSelection

    public void replaceSelection(String content)
    Replaces the currently selected content with new content represented by the given string. If there is no selection this amounts to an insert of the given text. If there is no replacement text (i.e. the content string is empty or `null`) this amounts to a removal of the current selection. The replacement text will have the attributes currently defined for input. If the component is not editable, beep and return.
    Overrides:
      `replaceSelection` in class `JTextComponent`
    Parameters:
      `content` - the content to replace the selection with. This value can be `null`

  - ### createEditorKitForContentType

    public static EditorKit createEditorKitForContentType(String type)
    Creates a handler for the given type from the default registry of editor kits. The registry is created if necessary. If the registered class has not yet been loaded, an attempt is made to dynamically load the prototype of the kit for the given type. If the type was registered with a `ClassLoader`, that `ClassLoader` will be used to load the prototype. If there was no registered `ClassLoader`, `Class.forName` will be used to load the prototype.

    Once a prototype `EditorKit` instance is successfully located, it is cloned and the clone is returned.

    Parameters:
      `type` - the content type
    Returns:
      the editor kit, or `null` if there is nothing registered for the given type

  - ### registerEditorKitForContentType

    public static void registerEditorKitForContentType(String type, String classname)
    Establishes the default bindings of `type` to `classname`. The class will be dynamically loaded later when actually needed, and can be safely changed before attempted uses to avoid loading unwanted classes. The prototype `EditorKit` will be loaded with `Class.forName` when registered with this method.
    Parameters:
      `type` - the non-`null` content type
      `classname` - the class to load later

  - ### registerEditorKitForContentType

    public static void registerEditorKitForContentType(String type, String classname, ClassLoader loader)
    Establishes the default bindings of `type` to `classname`. The class will be dynamically loaded later when actually needed using the given `ClassLoader`, and can be safely changed before attempted uses to avoid loading unwanted classes.
    Parameters:
      `type` - the non-`null` content type
      `classname` - the class to load later
      `loader` - the `ClassLoader` to use to load the name

  - ### getEditorKitClassNameForContentType

    public static String getEditorKitClassNameForContentType(String type)
    Returns the currently registered `EditorKit` class name for the type `type`.
    Parameters:
      `type` - the non-`null` content type
    Returns:
      a `String` containing the `EditorKit` class name for `type`
    Since:
      1.3

  - ### getPreferredSize

    public Dimension getPreferredSize()
    Returns the preferred size for the `JEditorPane`. The preferred size for `JEditorPane` is slightly altered from the preferred size of the superclass. If the size of the viewport has become smaller than the minimum size of the component, the scrollable definition for tracking width or height will turn to false. The default viewport layout will give the preferred size, and that is not desired in the case where the scrollable is tracking. In that case the normal preferred size is adjusted to the minimum size. This allows things like HTML tables to shrink down to their minimum size and then be laid out at their minimum size, refusing to shrink any further.
    Overrides:
      `getPreferredSize` in class `JComponent`
    Returns:
      a `Dimension` containing the preferred size
    See Also:
      - `JComponent.setPreferredSize(java.awt.Dimension)`
      - `ComponentUI`

  - ### setText

    @BeanProperty(bound=false, description="the text of this component") public void setText(String t)
    Sets the text of this `TextComponent` to the specified content, which is expected to be in the format of the content type of this editor. For example, if the type is set to `text/html` the string should be specified in terms of HTML.

    This is implemented to remove the contents of the current document, and replace them by parsing the given string using the current `EditorKit`. This gives the semantics of the superclass by not changing out the model, while supporting the content type currently set on this component. The assumption is that the previous content is relatively small, and that the previous content doesn't have side effects. Both of those assumptions can be violated and cause undesirable results. To avoid this, create a new document, `getEditorKit().createDefaultDocument()`, and replace the existing `Document` with the new one. You are then assured the previous `Document` won't have any lingering state.

    1. Leaving the existing model in place means that the old view will be torn down, and a new view created, where replacing the document would avoid the tear down of the old view.
    2. Some formats (such as HTML) can install things into the document that can influence future contents. HTML can have style information embedded that would influence the next content installed unexpectedly.

    An alternative way to load this component with a string would be to create a StringReader and call the read method. In this case the model would be replaced after it was initialized with the contents of the string.

    Overrides:
      `setText` in class `JTextComponent`
    Parameters:
      `t` - the new text to be set; if `null` the old text will be deleted
    See Also:
      - `getText()`

  - ### getText

    public String getText()
    Returns the text contained in this `TextComponent` in terms of the content type of this editor. If an exception is thrown while attempting to retrieve the text, `null` will be returned. This is implemented to call `JTextComponent.write` with a `StringWriter`.
    Overrides:
      `getText` in class `JTextComponent`
    Returns:
      the text
    See Also:
      - `setText(java.lang.String)`

  - ### getScrollableTracksViewportWidth

    @BeanProperty(bound=false) public boolean getScrollableTracksViewportWidth()
    Returns true if a viewport should always force the width of this `Scrollable` to match the width of the viewport.
    Specified by:
      `getScrollableTracksViewportWidth` in interface `Scrollable`
    Overrides:
      `getScrollableTracksViewportWidth` in class `JTextComponent`
    Returns:
      true if a viewport should force the Scrollables width to match its own, false otherwise

  - ### getScrollableTracksViewportHeight

    @BeanProperty(bound=false) public boolean getScrollableTracksViewportHeight()
    Returns true if a viewport should always force the height of this `Scrollable` to match the height of the viewport.
    Specified by:
      `getScrollableTracksViewportHeight` in interface `Scrollable`
    Overrides:
      `getScrollableTracksViewportHeight` in class `JTextComponent`
    Returns:
      true if a viewport should force the `Scrollable`'s height to match its own, false otherwise

  - ### paramString

    protected String paramString()
    Returns a string representation of this `JEditorPane`. This method is intended to be used only for debugging purposes, and the content and format of the returned string may vary between implementations. The returned string may be empty but may not be `null`.
    Overrides:
      `paramString` in class `JTextComponent`
    Returns:
      a string representation of this `JEditorPane`

  - ### getAccessibleContext

    @BeanProperty(bound=false) public AccessibleContext getAccessibleContext()
    Gets the AccessibleContext associated with this JEditorPane. For editor panes, the AccessibleContext takes the form of an AccessibleJEditorPane. A new AccessibleJEditorPane instance is created if necessary.
    Specified by:
      `getAccessibleContext` in interface `Accessible`
    Overrides:
      `getAccessibleContext` in class `JTextComponent`
    Returns:
      an AccessibleJEditorPane that serves as the AccessibleContext of this JEditorPane