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Simple Java/XML question

I have the following XML file...

<?xml version="1.0"?>
<animals>
<animal>
<name>Tiger</name>
<questions>
<question index="0">true</question>
<question index="1">true</question>
</questions>
</animal>
<animal>
<name>Leopard</name>
<questions>
<question index="0">true</question>
<question index="1">false</question>
</questions>
</animal>
</animals>
.... and I have the following java file which reads this in...

private static void readAnimals() {
DocumentBuilderFactory docBuilderFactory =
DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
Document doc = docBuilder.parse (new File("animals.xml"));

// normalize text representation
doc.getDocumentElement ().normalize ();
System.out.println ("Root element of the doc is " +
doc.getDocumentElement().getNodeName());
NodeList listOfAnimals = doc.getElementsByTagName("animal");
int totalPersons = listOfAnimals.getLength();
System.out.println("Total no of animals : " + totalPersons);

for(int s=0; s<listOfAnimals.getLength() ; s++){

Node firstAnimalNode = listOfAnimals.item(s);
if(firstAnimalNode.getNodeType() == Node.ELEMENT_NODE){

Element firstAnimalElement = (Element)firstAnimalNode;

//-------
NodeList nameList = firstAnimalElement.getElementsByTagName("name");
Element nameElement = (Element)nameList.item(0);

NodeList textNList = nameElement.getChildNodes();
System.out.println("Name : " +
((Node)textNList.item(0)).getNodeValue().trim());

Animal animal = new
Animal(((Node)textNList.item(0)).getNodeValue().tr im());

//THE FOLLOWING IS THE PART IM UNSURE OF...
// I'M TRYING TO READ IN 'question' ELEMENTS

NodeList questionsList =
firstAnimalElement.getElementsByTagName("questions ");
Element questionElement = (Element)questionsList.item(0);

NodeList listOfQuestions = questionElement.getChildNodes();
int totalQuestions = listOfQuestions.getLength();
System.out.println("Total no of questions : " + totalQuestions);

for(int i=0; i<listOfQuestions.getLength() ; i++){
Node questionTempNode = listOfQuestions.item(s);
System.out.println("Name : " +
((Node)textNList.item(0)).getNodeValue().trim());
}
}//end of if clause
}
I've marked the part of the code I'm unsure of. Basically I can get it to
create a new Animal object for each animal it encounters from the XML file,
but I then want to loop round each "question" in the XML file and use the
true/false values from that. How do I do that?

Also, how do I access the index attribute from each "question"?

Sorry for the basic question but tonight is the first time I've used XML
with Java.
Jul 20 '05 #1
3 4426
kjc
Stevey wrote:
I have the following XML file...

<?xml version="1.0"?>
<animals>
<animal>
<name>Tiger</name>
<questions>
<question index="0">true</question>
<question index="1">true</question>
</questions>
</animal>
<animal>
<name>Leopard</name>
<questions>
<question index="0">true</question>
<question index="1">false</question>
</questions>
</animal>
</animals>
... and I have the following java file which reads this in...

private static void readAnimals() {
DocumentBuilderFactory docBuilderFactory =
DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
Document doc = docBuilder.parse (new File("animals.xml"));

// normalize text representation
doc.getDocumentElement ().normalize ();
System.out.println ("Root element of the doc is " +
doc.getDocumentElement().getNodeName());
NodeList listOfAnimals = doc.getElementsByTagName("animal");
int totalPersons = listOfAnimals.getLength();
System.out.println("Total no of animals : " + totalPersons);

for(int s=0; s<listOfAnimals.getLength() ; s++){

Node firstAnimalNode = listOfAnimals.item(s);
if(firstAnimalNode.getNodeType() == Node.ELEMENT_NODE){

Element firstAnimalElement = (Element)firstAnimalNode;

//-------
NodeList nameList = firstAnimalElement.getElementsByTagName("name");
Element nameElement = (Element)nameList.item(0);

NodeList textNList = nameElement.getChildNodes();
System.out.println("Name : " +
((Node)textNList.item(0)).getNodeValue().trim());

Animal animal = new
Animal(((Node)textNList.item(0)).getNodeValue().tr im());

//THE FOLLOWING IS THE PART IM UNSURE OF...
// I'M TRYING TO READ IN 'question' ELEMENTS

NodeList questionsList =
firstAnimalElement.getElementsByTagName("questions ");
Element questionElement = (Element)questionsList.item(0);

NodeList listOfQuestions = questionElement.getChildNodes();
int totalQuestions = listOfQuestions.getLength();
System.out.println("Total no of questions : " + totalQuestions);

for(int i=0; i<listOfQuestions.getLength() ; i++){
Node questionTempNode = listOfQuestions.item(s);
System.out.println("Name : " +
((Node)textNList.item(0)).getNodeValue().trim());
}
}//end of if clause
}
I've marked the part of the code I'm unsure of. Basically I can get it to
create a new Animal object for each animal it encounters from the XML file,
but I then want to loop round each "question" in the XML file and use the
true/false values from that. How do I do that?

Also, how do I access the index attribute from each "question"?

Sorry for the basic question but tonight is the first time I've used XML
with Java.

Make your life easier and use JDOM http://www.jdom.org
Jul 20 '05 #2
kjc wrote:
Stevey wrote:
I have the following XML file...

<?xml version="1.0"?>
<animals>
<animal>
<name>Tiger</name>
<questions>
<question index="0">true</question>
<question index="1">true</question>
</questions>
</animal>
<animal>
<name>Leopard</name>
<questions>
<question index="0">true</question>
<question index="1">false</question>
</questions>
</animal>
</animals>
... and I have the following java file which reads this in...

private static void readAnimals() {
DocumentBuilderFactory docBuilderFactory =
DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
Document doc = docBuilder.parse (new File("animals.xml"));

// normalize text representation
doc.getDocumentElement ().normalize ();
System.out.println ("Root element of the doc is " +
doc.getDocumentElement().getNodeName());
NodeList listOfAnimals = doc.getElementsByTagName("animal");
int totalPersons = listOfAnimals.getLength();
System.out.println("Total no of animals : " + totalPersons);

for(int s=0; s<listOfAnimals.getLength() ; s++){

Node firstAnimalNode = listOfAnimals.item(s);
if(firstAnimalNode.getNodeType() == Node.ELEMENT_NODE){

Element firstAnimalElement = (Element)firstAnimalNode;

//-------
NodeList nameList = firstAnimalElement.getElementsByTagName("name");
Element nameElement = (Element)nameList.item(0);

NodeList textNList = nameElement.getChildNodes();
System.out.println("Name : " +
((Node)textNList.item(0)).getNodeValue().trim());

Animal animal = new
Animal(((Node)textNList.item(0)).getNodeValue().tr im());

//THE FOLLOWING IS THE PART IM UNSURE OF...
// I'M TRYING TO READ IN 'question' ELEMENTS

NodeList questionsList =
firstAnimalElement.getElementsByTagName("questions ");
Element questionElement = (Element)questionsList.item(0);

NodeList listOfQuestions = questionElement.getChildNodes();
int totalQuestions = listOfQuestions.getLength();
System.out.println("Total no of questions : " + totalQuestions);

for(int i=0; i<listOfQuestions.getLength() ; i++){
Node questionTempNode = listOfQuestions.item(s);
System.out.println("Name : " +
((Node)textNList.item(0)).getNodeValue().trim());
}
}//end of if clause
}
I've marked the part of the code I'm unsure of. Basically I can get it
to create a new Animal object for each animal it encounters from the
XML file, but I then want to loop round each "question" in the XML
file and use the true/false values from that. How do I do that?

Also, how do I access the index attribute from each "question"?

Sorry for the basic question but tonight is the first time I've used
XML with Java.

Make your life easier and use JDOM http://www.jdom.org


i'll second that, JDOM's great.
Jul 20 '05 #3


Stevey wrote:
Also, how do I access the index attribute from each "question"?


If you have an Element object then you can call
elementObject.getAttribute("index")
to tet the attribute value as a string.

--

Martin Honnen
http://JavaScript.FAQTs.com/
Jul 20 '05 #4

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