The Java traversal reads the contents of the XML file
- 2020-04-01 04:38:33
- OfStack
This article explains the Java traversal to read the XML file content of the detailed code, Shared for your reference, the specific content is as follows
package test;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Iterator;
import javax.xml.namespace.NamespaceContext;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
import org.apache.axiom.om.OMAbstractFactory;
import org.apache.axiom.om.OMAttribute;
import org.apache.axiom.om.OMComment;
import org.apache.axiom.om.OMContainer;
import org.apache.axiom.om.OMDataSource;
import org.apache.axiom.om.OMDocType;
import org.apache.axiom.om.OMDocument;
import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.OMException;
import org.apache.axiom.om.OMFactory;
import org.apache.axiom.om.OMNamespace;
import org.apache.axiom.om.OMProcessingInstruction;
import org.apache.axiom.om.OMSourcedElement;
import org.apache.axiom.om.OMText;
import org.apache.axiom.om.OMXMLParserWrapper;
import org.apache.axiom.om.impl.builder.StAXOMBuilder;
import org.xml.sax.helpers.XMLReaderFactory;
public class Axiomtest {
public static void main(String[] args) throws FileNotFoundException, Throwable {
// read xml
FileInputStream xmlFile = new FileInputStream("line-item2.xml");
XMLStreamReader parser = XMLInputFactory.newInstance().createXMLStreamReader(xmlFile);
//You also need the StAXOMBuilder object
StAXOMBuilder builder = new StAXOMBuilder(parser);
OMElement doc = builder.getDocumentElement(); //Read <Fool> </ fool>
OMElement cre = doc.getFirstChildWithName(new QName("student")); //Read <Student>
OMElement cre1 = cre.getFirstChildWithName(new QName("id")); //Read <Id> </ id>
System.out.println(cre1.getLocalName()+":"+cre1.getText());
cre1 = cre.getFirstChildWithName(new QName("name")); //Read <Name> </ name>
System.out.println(cre1.getLocalName()+":"+cre1.getText());
cre1 = cre.getFirstChildWithName(new QName("age")); //Read <Age> </ age>
System.out.println(cre1.getLocalName()+":"+cre1.getText());
cre1 = cre.getFirstChildWithName(new QName("sex")); //Read <Sex> </ sex>
System.out.println(cre1.getLocalName()+":"+cre1.getText());
cre1 = cre.getFirstChildWithName(new QName("message")); //Read <Sex> </ sex>
System.out.println(cre1.getLocalName()+":"+cre1.getText());
System.out.println("------------------------------1");
Iterator<OMElement> iter = doc.getChildElements();
while(iter.hasNext()){
OMElement temp = iter.next();
System.out.println("====================");
System.out.println(temp.getLocalName());
// System.out.println(temp.getText());
if(temp.getLocalName().equals("student")){
Iterator<OMElement> iter1 = temp.getChildElements();
System.out.println("----------------");
while(iter1.hasNext()){
OMElement temp1 = iter1.next();
System.out.println(temp1.getLocalName()+":"+temp1.getText());
}
}
}
System.out.println("!!!!!!!!!!!!!");
FileInputStream file = new FileInputStream("line-item2.xml");
XMLStreamReader read = XMLInputFactory.newInstance().createXMLStreamReader(file);
StAXOMBuilder sta = new StAXOMBuilder(read);
OMElement all = sta.getDocumentElement();
Iterator<OMElement> ite1 = all.getChildElements();
while(ite1.hasNext()){
OMElement temp = ite1.next();
if(temp.getLocalName().equals("student")){
Iterator<OMElement> ite2 = temp.getChildElements();
while(ite2.hasNext()){
OMElement temp1 = ite2.next();
System.out.println(temp1.getLocalName()+":"+temp1.getText());
}
}
}
// write xml
OMFactory factory = OMAbstractFactory.getOMFactory();
//Create a doc node, which merges with the root node below
OMDocument dod = factory.createOMDocument();
//Create root node
OMElement root = factory.createOMElement("root","","");
OMElement add = factory.createOMElement("dabi","","");
//Create two normal nodes
OMElement stu = factory.createOMElement("student","","");
stu.addChild(factory.createOMText("mac"));
OMElement tea = factory.createOMElement("teacher","","");
tea.addChild(factory.createOMText("silly"));
//Build the tree, connecting two normal nodes to the root node
root.addChild(stu);
root.addChild(tea);
//Build the tree and connect the root node to the doc node
dod.addChild(root);
//Build writer for output
XMLStreamWriter writer = XMLOutputFactory.newInstance().createXMLStreamWriter(
new FileOutputStream("2.xml"));
root.serialize(writer); // cache on
writer.flush();
FileInputStream xmlFile1 = new FileInputStream("2.xml");
XMLStreamReader parser1 = XMLInputFactory.newInstance().createXMLStreamReader(xmlFile1);
StAXOMBuilder builder1 = new StAXOMBuilder(parser1);
OMElement doc1 = builder1.getDocumentElement();
Iterator<OMElement> iter1 = doc1.getChildElements();
while(iter1.hasNext()){
OMElement temp = iter1.next();
System.out.println("====================");
System.out.println(temp.getLocalName()+":"+temp.getText());
}
System.out.println("!!!!!!!!");
OMFactory omf = OMAbstractFactory.getOMFactory();
// OMDocument od = omf.createOMDocument();
OMElement root1 = omf.createOMElement("root","","");
OMElement name = omf.createOMElement("name","","");
OMElement sex = omf.createOMElement("sexy","","");
sex.addChild(omf.createOMText("man"));
name.addChild(omf.createOMText("dabi"));
root1.addChild(sex);
root1.addChild(name);
// od.addChild(root1);
XMLStreamWriter xmlw = XMLOutputFactory.newInstance().createXMLStreamWriter(new FileOutputStream("3.xml"));
root1.serialize(xmlw);
xmlw.flush();
}
}
<?xml version="1.0" encoding="UTF-8"?>
<fool>
<student>
<name>mac</name>
<id>12</id>
<age>33</age>
<sex>male</sex>
<message>hello world</message>
</student>
<student>
<name>silly</name>
<id>5</id>
<age>12</age>
<sex>female</sex>
</student>
<teacher>
<name>Mr. Jones</name>
<id>2</id>
<age>31</age>
<sex>male</sex>
</teacher>
<student>
<name>macy</name>
<id>2</id>
<age>40</age>
<sex>female</sex>
</student>
<student>
<name>tom</name>
<id>32</id>
<age>31</age>
<sex>male</sex>
</student>
<message>hello world</message>
</fool>
Share another example: XML files are read in JAVA
The steps to parse the XML are as follows:
1. Create a DocumentBuilder factory2. Create a DocumentBuilder object
3. The Document builder object's parse method gets the Document object
4. The getElementsByTagName of the Document object gets the NodeList collection
Walk through getFirstChild and getNextSibling;
Bags used:
Import javax.mail, XML parsers. *;The import org. W3c. Dom. *;
The import org. XML. Sax. *;
Objects used:
DocumentBuilderFactory: creates an abstract factory for the DocumentBuilder DocumentBuilder: you can get a Document from XML Document: provides basic access to Document dataMethods used:
DocumentBuilder. Parse (String)' : parses the contents of a given URI into an XML Document and returns a new DOM Document object Document. The getElementsByTagName (String) ': returns a NodeList of all the Element of a given tag name Element.getattribute (String)' : gets the attribute value by name
Now parse an XML file
import javax.xml.parsers.*;
import org.w3c.dom.*;
import org.xml.sax.*;
public class Test
{
public static void main(String[] args)
{
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
try
{
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse("pet2.xml");
NodeList dogList = doc.getElementsByTagName("dog");
System.out.println(" A total of " + dogList.getLength() + " a dog node ");
for (int i = 0; i < dogList.getLength(); i++)
{
Node dog = dogList.item(i);
Element elem = (Element) dog;
System.out.println("id:" + elem.getAttribute("id"));
for (Node node = dog.getFirstChild(); node != null; node = node.getNextSibling())
{
if (node.getNodeType() == Node.ELEMENT_NODE)
{
String name = node.getNodeName();
String value = node.getFirstChild().getNodeValue();
System.out.print(name + ":" + value + "t");
}
}
System.out.println();
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
The XML file
<pets>
<dogs>
<dog id="1">
<name>YAYA</name>
<health>100</health>
<love>0</love>
<strain> Cool shonara </strain>
</dog>
<dog id="2">
<name>OUOU</name>
<health>90</health>
<love>15</love>
<strain> Smart labrador </strain>
</dog>
</dogs>
<penguins>
<penguin id="3">
<name>QQ</name>
<health>100</health>
<love>20</love>
<sex>Q wang </sex>
</penguin>
</penguins>
</pets> The above is the entire content of this article, I hope to help you with your study.