Show HTML Document
/*
Core SWING Advanced Programming
By Kim Topley
ISBN: 0 13 083292 8
Publisher: Prentice Hall
*/
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.PrintStream;
import java.util.Enumeration;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.UIManager;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import javax.swing.text.Element;
import javax.swing.text.JTextComponent;
public class ShowHTMLDocument {
public static void main(String[] args) {
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
} catch (Exception evt) {}
try {
JFrame f = new JFrame("HTMLDocument Structure");
final JEditorPane ep = new JEditorPane("links1.html");
ep.setEditable(false);
f.getContentPane().add(new JScrollPane(ep));
f.setSize(400, 300);
f.setVisible(true);
ep.addPropertyChangeListener(new PropertyChangeListener() {
public void propertyChange(PropertyChangeEvent evt) {
if (evt.getPropertyName().equals("page")) {
HTMLDocDisplay.displayModel(ep, System.out);
}
}
});
} catch (Exception e) {
System.out.println(e);
System.exit(1);
}
}
}
class HTMLDocDisplay {
public static void displayAttributes(AttributeSet a, int indent,
PrintStream out) {
if (a == null)
return;
a = a.copyAttributes();
Enumeration x = a.getAttributeNames();
for (int i = 0; i < indent; i++) {
out.print(" ");
}
if (x != null) {
out.println("ATTRIBUTES:");
while (x.hasMoreElements()) {
for (int i = 0; i < indent; i++) {
out.print(" ");
}
Object attr = x.nextElement();
out.println(" (" + attr + ", " + a.getAttribute(attr) + ")"
+ " [" + getShortClassName(attr.getClass()) + "/"
+ getShortClassName(a.getAttribute(attr).getClass())
+ "] ");
}
} else {
out.println("No attributes");
}
if (a.getResolveParent() != null) {
displayAttributes(a.getResolveParent().copyAttributes(),
indent + 1, out);
}
}
public static void displayModel(JTextComponent comp, PrintStream out) {
Document doc = comp.getDocument();
Element e = doc.getDefaultRootElement();
displayElement(doc, e, 0, out);
}
public static void displayElement(Document doc, Element e, int indent,
PrintStream out) {
for (int i = 0; i < indent; i++) {
out.print(" ");
}
out.println("===== Element Class: " + getShortClassName(e.getClass()));
for (int i = 0; i < indent; i++) {
out.print(" ");
}
int startOffset = e.getStartOffset();
int endOffset = e.getEndOffset();
out.println("Offsets [" + startOffset + ", " + endOffset + "]");
AttributeSet a = e.getAttributes();
Enumeration x = a.getAttributeNames();
for (int i = 0; i < indent; i++) {
out.print(" ");
}
out.println("ATTRIBUTES:");
while (x.hasMoreElements()) {
for (int i = 0; i < indent; i++) {
out.print(" ");
}
Object attr = x.nextElement();
out
.println(" ("
+ attr
+ ", "
+ a.getAttribute(attr)
+ ")"
+ " ["
+ getShortClassName(attr.getClass())
+ "/"
+ getShortClassName(a.getAttribute(attr).getClass())
+ "] ");
}
// Display the text for a leaf element
if (e.isLeaf()) {
try {
String str = doc.getText(startOffset, endOffset - startOffset);
if (str.length() > 40) {
str = str.substring(0, 40);
}
if (str.length() > 0) {
for (int i = 0; i < indent; i++) {
out.print(" ");
}
out.println("[" + str + "]");
}
} catch (BadLocationException ex) {
}
}
// Display child elements
int count = e.getElementCount();
for (int i = 0; i < count; i++) {
displayElement(doc, e.getElement(i), indent + 1, out);
}
}
public static String getShortClassName(Class clazz) {
String className = clazz.getName();
return className.substring(className.lastIndexOf(".") + 1);
}
}
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