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class tree
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static String filename;
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public static void main(String args[])
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static void doTree(Element elem, String indent)
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Systemoutprintln(indent + "<" + elemgetTagName() + ">");
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If this element has children, we loop over those children, starting by getting an enumeration of those children this way: import commsxmlParseException;
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import commsxmlDocument;
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import commsxmlElement;
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import javautilEnumeration;
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import javaio*;
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import javaioPrintStream;
import javanet*;
class tree
static String filename;
public static void main(String args[])
static void doTree(Element elem, String indent)
Systemoutprintln(indent + "<" + elemgetTagName() + ">");
if(elemnumElements() > 1){
Enumeration enum = elemgetChildren();
Then we loop over the child elements in the enumeration and call doTree() again to handle each child [md]note that we add four spaces to the indentation string to indent each deeper level of the tree correctly: import commsxmlParseException;
import commsxmlDocument;
import commsxmlElement;
import javautilEnumeration;
import javaio*;
import javaioPrintStream;
import javanet*;
class tree
static String filename;
public static void main(String args[])
static void doTree(Element elem, String indent)
Systemoutprintln(indent + "<" + elemgetTagName() + ">");
if(elemnumElements() > 1){
Enumeration enum = elemgetChildren();
while (enumhasMoreElements()) {
Element elem2 = (Element)enumnextElement();
doTree(elem2, indent + "
Finally, after looping over all the element's children, we display the close tag for the element: import commsxmlParseException;
import commsxmlDocument;
import commsxmlElement;
import javautilEnumeration;
import javaio*;
import javaioPrintStream;
import javanet*;
class tree
static String filename;
public static void main(String args[])
static void doTree(Element elem, String indent)
Systemoutprintln(indent + "<" + elemgetTagName() + ">");
if(elemnumElements() > 1){
Enumeration enum = elemgetChildren();
while (enumhasMoreElements()) {
Element elem2 = (Element)enumnextElement();
doTree(elem2, indent + "
Systemoutprintln(indent + "</" + elemgetTagName() + ">");
And that's it[md]using recursion, we're able to dissect an XML document's tree and display it Running the tree example on the above XML document gives us that document's tree structure as created by its start and end tags; here's the console output of the tree program: <DOCUMENT> <CUSTOMER> <NAME> <LASTNAME> </LASTNAME> <FIRSTNAME> </FIRSTNAME> </NAME> <DATE> </DATE>
<ORDERS> <ITEM> <PRODUCT> </PRODUCT> <NUMBER> </NUMBER> <PRICE> </PRICE> </ITEM> <ITEM> <PRODUCT> </PRODUCT> <NUMBER> </NUMBER> <PRICE> </PRICE> </ITEM> </ORDERS> </CUSTOMER> <CUSTOMER> <NAME> <LASTNAME>
</LASTNAME> <FIRSTNAME> </FIRSTNAME> </NAME> <DATE> </DATE> <ORDERS> <ITEM> <PRODUCT> </PRODUCT> <NUMBER> </NUMBER> <PRICE> </PRICE> </ITEM> <ITEM> <PRODUCT> </PRODUCT> <NUMBER> </NUMBER> <PRICE> </PRICE>
</ITEM> </ORDERS> </CUSTOMER> </DOCUMENT>
That's it[md]now we've dissected the treexml file and displayed the tree structure of that file using a simple recursion algorithm The tree example is a success[md]the code for this example, treejava, appears in Listing 41, and the XML file we read in, treexml, appears in Listing 42 Listing 41 + import commsxmlParseException;
import commsxmlDocument;
import commsxmlElement;
import javautilEnumeration;
import javaio*;
import javaioPrintStream;
import javanet*;
class tree
static String filename;
public static void main(String args[])
URL url = null;
try {
url = new URL("file:////c://xml//tree//treexml");
catch (MalformedURLException e) {
Systemoutprintln("Cannot create URL for: " + filename);
Systemexit(0);
Document d = new Document();
try {
dload(url);
catch (ParseException e) {
dreportError(e, Systemout);
if (d != null) {
doTree(dgetRoot(), "");
static void doTree(Element elem, String indent)
Systemoutprintln(indent + "<" + elemgetTagName() + ">");
if(elemnumElements() > 1){
Enumeration enum = elemgetChildren();
while (enumhasMoreElements()) {
Element elem2 = (Element)enumnextElement();
doTree(elem2, indent + "
Systemoutprintln(indent + "</" + elemgetTagName() + ">");
Listing 42 + < XML version = "10" >
<!DOCTYPE DOCUMENT [
<!ELEMENT DOCUMENT (CUSTOMER)*>
<!ELEMENT CUSTOMER (NAME,DATE,ORDERS)>
<!ELEMENT NAME (LASTNAME,FIRSTNAME)>
<!ELEMENT LASTNAME (#PCDATA)>
<!ELEMENT FIRSTNAME (#PCDATA)>
<!ELEMENT DATE (#PCDATA)>
<!ELEMENT ORDERS (ITEM)*>
<!ELEMENT ITEM (PRODUCT,NUMBER,PRICE)>
<!ELEMENT PRODUCT (#PCDATA)>
<!ELEMENT NUMBER (#PCDATA)>
<!ELEMENT PRICE (#PCDATA)>
<DOCUMENT>
<CUSTOMER>
<NAME>
<LASTNAME>Edwards</LASTNAME>
<FIRSTNAME>Britta</FIRSTNAME>
</NAME>
<DATE>April 17, 1998</DATE>
<ORDERS>
<ITEM>
<PRODUCT>Cucumber</PRODUCT>
<NUMBER>5</NUMBER>
<PRICE>$125</PRICE>
</ITEM>
<ITEM>
<PRODUCT>Lettuce</PRODUCT>
<NUMBER>2</NUMBER>
<PRICE>$98</PRICE>
</ITEM>
</ORDERS>
</CUSTOMER>
<CUSTOMER>
<NAME>
<LASTNAME>Thompson</LASTNAME>
<FIRSTNAME>Phoebe</FIRSTNAME>
</NAME>
<DATE>May 27, 1998</DATE>
<ORDERS>
<ITEM>
<PRODUCT>Banana</PRODUCT>
<NUMBER>12</NUMBER>
<PRICE>$295</PRICE>
</ITEM>
<ITEM>
<PRODUCT>Apple</PRODUCT>
<NUMBER>6</NUMBER>
<PRICE>$150</PRICE>
</ITEM>
</ORDERS>
</CUSTOMER>
</DOCUMENT>
The tree example has given us some experience in dissecting an XML document, but it's a consoleoriented example When you say "browser," people think of a window-oriented application that displays its documents in a graphical way Our next example does just that
The browser Example
Our next example will be a windowed browser named browserjava When the user runs this application, we'll present them with a window with a button in it labeled Browse: When the user clicks the Browse button, we'll read in our example document, which we'll call browserxml here: < XML version = "10" >
<!DOCTYPE DOCUMENT [
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