Java reading and parsing xml file example
Read the local xml file and parse it through DOM. The characteristic of DOM parsing is to load the entire xml file into the memory to form a DOM tree structure. The tree structure is convenient for traversal and manipulation.
The characteristic of DOM parsing is to read the xml file and convert it into a dom tree structure, which is traversed through the nodes.
This is W3c’s concept of nodes
If the xml contains a large amount of data, due to the feature of dom loading the xml into the memory at one time, the dom is not suitable for containing a large amount of data. xml parsing. When a large amount of xml is included, parsing with SAX saves memory.
The following is an example of using DOM to parse xml files:
The xml file structure is as follows:
<?xml version="1.0" encoding="ISO-8859-1"?> <bookstore> <book category="cooking"> <title>Everyday Italian</title> <author>Giada De Laurentiis</author> <year>2005</year> <price>30.00</price> </book> <book category="children"> <title>Harry Potter</title> <author>J K. Rowling</author> <year>2005</year> <price>29.99</price> </book> <book category="web"> <title>XQuery Kick Start</title> <author>James McGovern</author> <year>2003</year> <price>49.99</price> </book> <book category="web" cover="paperback"> <title>Learning XML</title> <author>Erik T. Ray</author> <year>2003</year> <price>39.95</price> </book> </bookstore>
Create a class to parse xml as follows:
package xml.dom;
import java.io.File;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
public class ReadXmlFile {
public static void main(String[] args) {
try{
File xmlFile = new File("src/resource/book.xml");
DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = builderFactory.newDocumentBuilder();
Document doc = builder.parse(xmlFile);
doc.getDocumentElement().normalize();
System.out.println("Root element: "+doc.getDocumentElement().getNodeName());
NodeList nList = doc.getElementsByTagName("book");
for(int i = 0 ; i<nList.getLength();i++){
Node node = nList.item(i);
System.out.println("Node name: "+ node.getNodeName());
Element ele = (Element)node;
System.out.println("----------------------------");
if(node.getNodeType() == Element.ELEMENT_NODE){
System.out.println("book category: "+ ele.getAttribute("category"));
System.out.println("title name: "+ ele.getElementsByTagName("title").item(0).getTextContent());
System.out.println("author name: "+ele.getElementsByTagName("author").item(0).getTextContent());
System.out.println("year :"+ele.getElementsByTagName("year").item(0).getTextContent());
System.out.println("price : "+ele.getElementsByTagName("price").item(0).getTextContent());
System.out.println("-------------------------");
}
}Analysis results:
Root element: bookstore Node name: book ---------------------------- book category: cooking title name: Everyday Italian author name: Giada De Laurentiis year :2005 price : 30.00 ------------------------- Node name: book ---------------------------- book category: children title name: Harry Potter author name: J K. Rowling year :2005 price : 29.99 ------------------------- Node name: book ---------------------------- book category: web title name: XQuery Kick Start author name: James McGovern year :2003 price : 49.99 ------------------------- Node name: book ---------------------------- book category: web title name: Learning XML author name: Erik T. Ray year :2003 price : 39.95 -------------------------
The above is to obtain the corresponding value through name,
The following is output using the loop node method:
The code for the loop node output method is as follows:
package xml.dom;
import java.io.File;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
public class ReadXmlFile2 {
public static void main(String[] args) {
try{
File xmlFile = new File("src/resource/book.xml");
DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = builderFactory.newDocumentBuilder();
Document doc = builder.parse(xmlFile);
doc.getDocumentElement().normalize();
System.out.println("Root element: "+doc.getDocumentElement().getNodeName());
if(doc.hasChildNodes()){
printNode(doc.getChildNodes());
}
}catch(Exception e){
e.printStackTrace();
}
}
public static void printNode(NodeList nodeList){
System.out.println("------------------------");
// System.out.println(nodeList.getLength());
for(int i = 0; i<nodeList.getLength(); i++){
Node node = (Node)nodeList.item(i);
if(node.getNodeType() == Node.ELEMENT_NODE){
System.out.println("node name: "+node.getNodeName());
System.out.println("node value: "+node.getTextContent());
if(node.hasAttributes()){
NamedNodeMap nodeMap = node.getAttributes();
for(int j = 0; j < nodeMap.getLength() ; j++){
Node nodenew = nodeMap.item(j);
System.out.println("node name "+nodenew.getNodeName());
System.out.println("node value "+nodenew.getNodeValue());
}
}
if(node.hasChildNodes()){
printNode(node.getChildNodes());
}
}
}
}
}Output result As follows:
Root element: bookstore ------------------------ node name: bookstore node value: Everyday Italian Giada De Laurentiis 2005 30.00 Harry Potter J K. Rowling 2005 29.99 XQuery Kick Start James McGovern 2003 49.99 Learning XML Erik T. Ray 2003 39.95 ------------------------ node name: book node value: Everyday Italian Giada De Laurentiis 2005 30.00 node name category node value cooking ------------------------ node name: title node value: Everyday Italian node name lang node value en ------------------------ node name: author node value: Giada De Laurentiis ------------------------ node name: year node value: 2005 ------------------------ node name: price node value: 30.00 ------------------------ node name: book node value: Harry Potter J K. Rowling 2005 29.99 node name category node value children ------------------------ node name: title node value: Harry Potter node name lang node value en ------------------------ node name: author node value: J K. Rowling ------------------------ node name: year node value: 2005 ------------------------ node name: price node value: 29.99 ------------------------ node name: book node value: XQuery Kick Start James McGovern 2003 49.99 node name category node value web ------------------------ node name: title node value: XQuery Kick Start node name lang node value en ------------------------ node name: author node value: James McGovern ------------------------ node name: year node value: 2003 ------------------------ node name: price node value: 49.99 ------------------------ node name: book node value: Learning XML Erik T. Ray 2003 39.95 node name category node value web node name cover node value paperback ------------------------ node name: title node value: Learning XML node name lang node value en ------------------------ node name: author node value: Erik T. Ray ------------------------ node name: year node value: 2003 ------------------------ node name: price node value: 39.95 ------------------------
Questions about nodes:
<book category="cooking"> <title>Everyday Italian</title> <author>Giada De Laurentiis</author> <year>2005</year> <price>30.00</price> </book>
For book applications: doc.getChildNodes() gets a NodeList where the length of the NodeList is 9
The 9 nodes are as follows:
title node
lang node
Everyday node
author node
Giada De Laurentiis node
year node
2005 node
price node
30.00 node
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