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<!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 browser will then display the content of the document (as opposed to the document's tags, as in the last example), just as any browser might: Here we'll indent each successive line of the document's content to indicate the document's structure This will be our first windowed browser, so let's get started immediately We begin by declaring a new applet class named browser in the browserjava file: import javaappletApplet;
public class browser extends Applet{
Then, in the main() method, we create a new window of the browserFrame class (which we'll write in a moment), install the applet in that window, and call the applet's init() method: import javaappletApplet;
public class browser extends Applet{
public static void main(String args[])
browserFrame frame = new browserFrame("XML Browser");
frameshow();
framehide();
frameresize(320, 240);
browser applet = new browser();
frameadd("Center", applet);
appletinit();
appletstart();
frameshow();
The browserFrame class is just a standard window of the kind we've created before: class browserFrame extends Frame
public browserFrame(String str)
super (str);
public boolean handleEvent(Event evt)
switch (evtid)
case EventWINDOW_DESTROY:
dispose();
Systemexit(0);
return true;
default:
return superhandleEvent(evt);
In the applet's init() method, we add the button we'll use, giving it the caption "Browse": import javaawt*;
import javaappletApplet;
public class browser extends Applet{
Button button1;
public static void main(String args[])
public void init(){
button1 = new Button("Browse");
add(button1);
In the action() method, we read in the browserxml document and call the recursive method doTree() The doTree() method will place the content of the XML document in a String array named displayLines[], which we'll display in the applet's paint() method (each string in this array corresponds to one line on the screen)) To make sure that array isdisplayed, we call the repaint() method (to force Java to call the paint() method) after calling doTree(): import commsxmlParseException;
import commsxmlDocument;
import commsxmlElement;
import javaawt*;
import javanet*;
import javaappletApplet;
public class browser extends Applet{
Button button1;
static String filename;
public static void main(String args[])
public void init(){
public boolean action (Event e, Object o){
URL url = null;
try {
url = new URL("file:////c://xml//browser//browserxml");
catch (MalformedURLException e1) {
Systemoutprintln("Cannot create URL for: " + filename);
Systemexit(0);
Document d = new Document();
try {
dload(url);
catch (ParseException e3) {
dreportError(e3, Systemout);
if (d != null) {
doTree(dgetRoot(), "");
repaint();
return true;
Now we can write the doTree() method: import commsxmlParseException;
import commsxmlDocument;
import commsxmlElement;
import javautilEnumeration;
import javaawt*;
import javanet*;
import javaappletApplet;
public class browser extends Applet{
Button button1;
static String filename;
public static void main(String args[])
public void init(){
public boolean action (Event e, Object o)
void doTree(Element elem, String indent)
The doTree() method here has two tasks: to loop over the current element's children, calling doTree() again for each of them, or to add the current element's character data to the array of Strings we've named displayStrings[] (this is the array we'll print out in the paint() method) We start doTree(), then, by checking if there are any child elements in the current element (the numElements() method always returns at least a value of 1, for the current element[md]if it returns more than 1, there are child elements): void doTree(Element elem, String indent)
if(elemnumElements() > 1){
We continue by looping over the element's children, if there are any: void doTree(Element elem, String indent)
if(elemnumElements() > 1){
Enumeration enum = elemgetChildren();
while (enumhasMoreElements()) {
In this loop, we first get the next child element, calling it elem2: void doTree(Element elem, String indent)
if(elemnumElements() > 1){
Enumeration enum = elemgetChildren();
while (enumhasMoreElements()) {
Element elem2 = (Element)enumnextElement();
Then we call doTree() again for that child element, adding four spaces to the indent string to indent eachsuccessive level correctly:
void doTree(Element elem, String indent)
if(elemnumElements() > 1){
Enumeration enum = elemgetChildren();
while (enumhasMoreElements()) {
Element elem2 = (Element)enumnextElement();
doTree(elem2, indent + "
That takes care of the child elements On the other hand, if the element doesn't have any child elements, we'll assume this element holds character data that we should display in our browser's window
Note: In our next example, we'll start handling more sophisticated documents where elements can contain both character data and child elements; in this simple example, we'll restrict elements to containing one or the other type of content: child elements or character data We'll place the element's character data in the displayStrings[] array, and use an integer index into that array named numberDisplayLines; here's how we set up those two new items in our program: import commsxmlParseException;
import commsxmlDocument;
import commsxmlElement;
import javautilEnumeration;
import javaawt*;
import javanet*;
import javaappletApplet;
public class browser extends Applet{
Button button1;
static String filename;
--> static String displayStrings[] = new String[100];
--> static int numberDisplayLines = 0;
public static void main(String args[])
We add the current element's character data to the displayStrings[] array this way[md]note that we include the indentation string as well to indent the current entry properly: void doTree(Element elem, String indent)
if(elemnumElements() > 1){
Enumeration enum = elemgetChildren();
while (enumhasMoreElements()) {
Element elem2 = (Element)enumnextElement();
doTree(elem2, indent + "
}else{
displayStrings[numberDisplayLines++] = indent + elem getText();
That completes doTree() The last step in completing our example is to add the paint() method to display the content of the XML document as stored in the displayStrings[] array: import commsxmlParseException;
import commsxmlDocument;
import commsxmlElement;
import javautilEnumeration;
import javaawt*;
import javanet*;
import javaappletApplet;
public class browser extends Applet{
Button button1;
static String filename;
static String displayStrings[] = new String[100];
static int numberDisplayLines = 0;
public static void main(String args[])
public void init(){
public boolean action (Event e, Object o)
void doTree(Element elem, String indent)
public void paint(Graphics g)
--> }
In the paint() method, we want to display the strings in the array displayStrings[] in the browser's window We've already seen that you can use the Java Graphics class' drawString() method to display a line of text in a window, but we'll have multiple lines of text here[md]how do we handle that We will have to find the height of each line and move down to the next line ourselves in order to display each successive line
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