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Code example for parsing XML files in Java

Y2J

Release： 2017-04-27 13:19:24

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Using Java to parse XML documents, there are two most commonly used methods: using event-based XML Simple API (Simple API for XML) called SAX and tree- and node-based Document Object Model (Document Object Module) called DOM .

Sun provides a Java API for XML Parsing (JAXP) interface to use SAX and DOM. Through JAXP, we can use any JAXP-compatible XML parser. The JAXP interface contains three packages:

org.w3c.dom The interface recommended by W3C for the XML standard planning document object model.

org.xml.sax Event-driven XML Simple API (SAX) for parsing XML

javax.xml.parsers parser factory tool that programmers obtain and configure special special parser.

java XML parser

import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.io.IOException; 
import java.io.InputStream; 
import javax.xml.parsers.DocumentBuilder; 
import javax.xml.parsers.DocumentBuilderFactory; 
import javax.xml.parsers.ParserConfigurationException; 
import org.w3c.dom.Document; 
import org.w3c.dom.Element; 
import org.w3c.dom.Node; 
import org.w3c.dom.NodeList; 
import org.xml.sax.SAXException; 
 
public class DomParse { 
    public DomParse(){ 
 
        DocumentBuilderFactory domfac=DocumentBuilderFactory.newInstance(); 
 
        try { 
            DocumentBuilder dombuilder=domfac.newDocumentBuilder(); 
            InputStream is=new FileInputStream("WebRoot/WEB-INF/hell.xml"); 
            Document doc=dombuilder.parse(is); 
            Element root=doc.getDocumentElement(); 
            NodeList books=root.getChildNodes(); 
 
            if(books!=null){ 
                for(int i=0;i<books.getLength();i++){ 
                    Node book=books.item(i); 
                    if(book.getNodeType()==Node.ELEMENT_NODE){ 
                        String email=book.getAttributes().getNamedItem("email").getNodeValue(); 
                        System.out.println(email); 
                        for(Node node=book.getFirstChild();node!=null;node=node.getNextSibling()){ 
                            if(node.getNodeType()==Node.ELEMENT_NODE){ 
                                if(node.getNodeName().equals("name")){ 
                                    String name=node.getNodeValue(); 
                                    String name1=node.getFirstChild().getNodeValue(); 
                                    System.out.println(name); 
                                    System.out.println(name1); 
                                } 
 
                                if(node.getNodeName().equals("price")){ 
                                    String price=node.getFirstChild().getNodeValue(); 
                                    System.out.println(price); 
                                } 
                            } 
                        } 
                    } 
                } 
            } 
        } catch (ParserConfigurationException e) { 
            e.printStackTrace(); 
       } catch (FileNotFoundException e) { 
             e.printStackTrace(); 
        } catch (SAXException e) { 
            e.printStackTrace(); 
        } catch (IOException e) { 
            e.printStackTrace(); 
        } 
    } 
 
    public static void main(String[] args)  
    { 
        new DomParse(); 
    }     
}

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