我对XML文件标签的打印和阅读存有疑问。 举个例子：我想从XML文件中选择一个特定的标签。在这里我需要读取和打印选定的父标签属性，并打印所有子标签（rubric，div，Interaction，simpleChoice，prompt）属性。我可以获得父标记ID，但我没有获得所有子标记ID。
public class ReadXmlId {
public static void main(String[] args) throws IOException {
String filePath = "/Users/myXml/Sample.xml";
File xmlFile = new File(filePath);
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder;
try {
dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(xmlFile);
doc.getDocumentElement().normalize();
printElement(doc);
System.out.println("XML file updated successfully");
} catch (SAXException | ParserConfigurationException e1) {
e1.printStackTrace();
}
}
private static void printElement(Document someNode) {
NodeList nodeList = someNode.getElementsByTagName("itemBody");
Node nNode = nodeList.item(0);
ArrayList<String> listOfArray = new ArrayList<String>();
for(int z=0,size= nodeList.getLength();z<size; z++) {
//Value is variable use to print Parent Tag (itemBody) ID
String Value = nodeList.item(z).getAttributes().getNamedItem("id").getNodeValue();
listOfArray.add(Value);
//Syntax to read the child tag
NodeList nList = nNode.getChildNodes();
for (int i = 0; i < nList.getLength();i++) {
Node child = nList.item(i);
if (child.getNodeType() == Document.ELEMENT_NODE) {
if (child.getNodeName().equals("*")) {
//Value1 is variable use to print all child Tag (div,p,SimpleChoice and all) ID
String Value1 = nList.item(i).getAttributes().getNamedItem("id").getNodeValue();
listOfArray.add(Value1);
continue;
} else {
System.out.println("Empty List");
}
}
}
}
System.out.println("Array List"+listOfArray);
}
}
示例：（id）
<itemBody class="etsmcm01fmt" id="244_item_content_3">
<rubric class="item_response_information " id="244_item_response_information_21" use="instruction" view="author proctor scorer testConstructor tutor"/>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="../Passage/205.qti.xml"/>
<div class="stimulus_reference " id="244_stimulus_reference_4">
<p class="introduction passage-intro " id="244_introduction_5">Read<span class="formatted_text text_decoration:underline " id="200244_formatted_text_6">two</span> sentences</p>
</div>
<Interaction class="choice_list " id="244_choice_list_12" maxChoices="4" minChoices="0" responseIdentifier="RESPONSE" shuffle="false">
<prompt id="244_item_stem_8">
<p class="stem_paragraph " id="244_stem_paragraph_9">story</p>
</prompt>
<simpleChoice class="block_choice " id="200244_block_choice_13" identifier="i1">
<p class="choice_paragraph " id="200244_choice_paragraph_14">North and south</p>
</simpleChoice>
<simpleChoice class="block_choice " id="200244_block_choice_15" identifier="i2">
<p class="choice_paragraph " id="200244_choice_paragraph_16">Sun and Moon</p>
</simpleChoice>
<simpleChoice class="block_choice " id="200244_block_choice_17" identifier="i3">
<p class="choice_paragraph " id="200244_choice_paragraph_18">uncomfortable.</p>
</simpleChoice>
<simpleChoice class="block_choice " id="200244_block_choice_19" identifier="i4">
<p class="choice_paragraph " id="200244_choice_paragraph_20">head.</p>
</simpleChoice>
</Interaction></itemBody>
答案 0 :(得分：1)
如果我理解正确，您正在寻找一种方法来打印<itemBody>元素内所有元素的所有属性。
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
public class App {
public static void main(String[] args) throws IOException, ParserConfigurationException, SAXException {
File xmlFile = new File("C:\\test\\testDocXml.xml");
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder;
dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(xmlFile);
doc.getDocumentElement().normalize();
walkNode(doc);
}
private static void walkNode(Node node) {
NodeList nodeList = node.getChildNodes();
for (int i = 0; i < nodeList.getLength(); i++) {
checkChildNode(nodeList.item(i));
}
}
private static void checkChildNode(Node node) {
if (node.hasChildNodes()) {
checkAttributes(node);
walkNode(node);
}
}
private static void checkAttributes(Node node) {
if (node.hasAttributes()) {
NamedNodeMap attributes = node.getAttributes();
printAttributes(attributes);
}
}
private static void printAttributes(NamedNodeMap attributes) {
for (int i = 0; i < attributes.getLength(); i++) {
Node attribute = attributes.item(i);
if (attribute.getNodeName() == "id") {
System.out.println("Attribute found: " + attribute.getNodeName() + " : " + attribute.getNodeValue());
}
}
}
}
你得到的结果如下：
Attribute found: id : 244_item_content_3
Attribute found: id : 244_stimulus_reference_4
Attribute found: id : 244_introduction_5
Attribute found: id : 200244_formatted_text_6
Attribute found: id : 244_choice_list_12
Attribute found: id : 244_item_stem_8
Attribute found: id : 244_stem_paragraph_9
Attribute found: id : 200244_block_choice_13
Attribute found: id : 200244_choice_paragraph_14
Attribute found: id : 200244_block_choice_15
Attribute found: id : 200244_choice_paragraph_16
Attribute found: id : 200244_block_choice_17
Attribute found: id : 200244_choice_paragraph_18
Attribute found: id : 200244_block_choice_19
Attribute found: id : 200244_choice_paragraph_20
答案 1 :(得分：0)
在上述XML中的标记（交互）之间打印属性 id 的值。我使用Wesley代码并做了一些简单的更改。
public static void main(String[] args) throws IOException,ParserConfigurationException, SAXException {
String filePath = "/Users/myXml/SampleXml.xml";
File xmlFile = new File(filePath);
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder;
dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(xmlFile);
doc.getDocumentElement().normalize();
printElement(doc);
System.out.println("XML file updated successfully");
}
private static void printElement(Document someNode) {
NodeList nodeList = someNode.getElementsByTagName("Interaction");
Node nNode = nodeList.item(0);
for (int i = 0; i < nodeList.getLength(); i++) {
checkChildNode(nNode);
}
}
private static void walkNode(Node node) {
NodeList nodeList = node.getChildNodes();
for (int i = 0; i < nodeList.getLength(); i++) {
checkChildNode(nodeList.item(i));
}
}
private static void checkChildNode(Node node) {
if (node.hasChildNodes()) {
checkAttributes(node);
walkNode(node);
}
}
private static void checkAttributes(Node node) {
if (node.hasAttributes()) {
NamedNodeMap attributes = node.getAttributes();
printAttributes(attributes);
}
}
private static void printAttributes(NamedNodeMap attributes) {
for (int i = 0; i < attributes.getLength(); i++) {
Node attribute = attributes.item(i);
if (attribute.getNodeName() == "id") {
System.out.println("Attribute found: " + attribute.getNodeName()+ " : " + attribute.getNodeValue());
}
}
}
}