DOM parsing-readxml operations on XML using XML parsing development package JAXP

It Programmer development Essentials-all kinds of resources download list, history of the most IT resources, personal collection summary. package EDU.JVM;

Import java.io.IOException;

Import Javax.xml.parsers.DocumentBuilder;

Import Javax.xml.parsers.DocumentBuilderFactory;

Import javax.xml.parsers.ParserConfigurationException;

Import Org.junit.Test;

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;

Import com.sun.xml.internal.bind.v2.schemagen.xmlschema.List;

public class Jaxp_dom {

Get the Document object that represents the documents

@Test

public void Analydocument () throws Saxexception, IOException, parserconfigurationexception{

1. Create a factory

Documentbuilderfactory factory = Documentbuilderfactory.newinstance ();

2. Get DOM Parser

Documentbuilder builder = Factory.newdocumentbuilder ();

3. Parse the XML document and get the document that represents it

Document document = Builder.parse ("Webroot/product.xml");

}

Recursively print all the label (Element) names

@Test

public void Printtagname () throws Saxexception, IOException, parserconfigurationexception{

Documentbuilderfactory factory = Documentbuilderfactory.newinstance ();

Documentbuilder builder = Factory.newdocumentbuilder ();

Document document = Builder.parse ("Webroot/product.xml");

Get root node:

Node root = document.getElementById ("cata1");

Recursive invocation of the output node name and its child nodes

Printchildrennode (root);

}

private void Printchildrennode (node node) {

If the node is an element object, its element name is output, otherwise it will output #text

if (node instanceof Element) {

System.out.println ("<" +node.getnodename () + ">");

}

NodeList list = Node.getchildnodes ();

for (int i = 0; i < list.getlength (); i++) {

Node Childnode = List.item (i);

Printchildrennode (Childnode);

}

}

Get the value of the tag attribute in the XML document: <product category= "Handtool" >

@Test

public void Printtagattr () throws Exception {

Documentbuilderfactory factory = Documentbuilderfactory.newinstance ();

Documentbuilder builder = Factory.newdocumentbuilder ();

Document document = Builder.parse ("Webroot/product.xml");

String elementname = "Product";

String elementattrname = "Plant";

element element = (Element) document.getElementsByTagName (elementname). Item (0);

String Elementattrvalue = Element.getattribute (elementattrname);

System.out.println ("<" +elementname+ "" +elementattrname+ "= '" +elementattrvalue+ "' >");

}

}

where Product.xml file:

<?xml version= "1.0"  encoding= "Utf-8"?> <! doctype catalog system  "PRODUCT.DTD" > <catalog id= "cata1" >     <product category= "Handtool" >       < specifications weight= "2.0kg" > Wrench </specifications>       < Price street= "Hong Kong Street" >80.0</price>       <notes> This is a wrench </ notes>    </product>    <product category= "Table" >        <specifications>&table;</specifications>        <price street= "&street;"  wholesale= "section" >&price;</price>    </product> </catalog >

The output of the Printtagname () method:

<catalog> <product> <specifications> <price> <notes> <product> <specifications> <price>

The output of the Printtagattr () method:

<product category= ' Handtool ' >