"Parsing packages with dom4j" makes DOM-style operations on XML--readxml

It Programmer development Essentials-all kinds of resources download list, history of the most IT resources, personal collection summary. package edu.dom4j.dom;

Import Java.io.FileWriter;

Import java.io.IOException;

Import Java.util.Iterator;

Import java.util.List;

Import Org.dom4j.Attribute;

Import org.dom4j.Document;

Import org.dom4j.DocumentException;

Import org.dom4j.Element;

Import Org.dom4j.Node;

Import Org.dom4j.io.OutputFormat;

Import Org.dom4j.io.SAXReader;

Import Org.dom4j.io.XMLWriter;

Import Org.junit.Test;

/**

* 1. Read the text of the specified label

* 2. Read the properties of the specified label

* 3. Product.xml documents are pretty print (beautiful) and

* Compact format (compression) style printed to System.out and file

* Note: Because Chinese is not processed here, the Chinese printed to the console and XML file will be garbled,

* specific processing methods See : DOM4J tool When modifying XML files Chinese garbled solution

* 4. The XML structure of the Document object is output by the recursive method

**/

public class ReadXML {

Private String xmlfile = "Webroot/product2.xml";

Private Attribute Attribute;

private node node;

Public Document GetDocument () throws Documentexception {

Get DOM4J Parser

Saxreader reader = new Saxreader ();

Read the XML document: Note that it is under the Org.dom4j.Document package

Document document = Reader.read (xmlfile);

return document;

}

  /*

* Read the Second <product> tab in the <specifications> tables and chairs </specifications> text

* But this is also a label for text and cannot be read

   */

@Test

public void Readxmltext () throws documentexception{

Document document = GetDocument ();

Get the root node of the XML document

Element root = Document.getrootelement ();

Get the <product> child node collection under the root node, using the elements (name) method

List<element> products = root.elements ("Product");

Get to two <product> nodes

Element product2 = products.get (1);

Because there is only one specifications tag under Pruduct2, the element (name) method

Element specifications = Product2.element ("Specifications");

Gets the text of the specifications node

String text = Specifications.gettext ();

System.out.println ("<specifications>" +text+ "</specifications>");

Output Results:<specifications> table </specifications> Chairs

}

//Read the category and inventory property values of the first <product> tag

@Test

public void Readxmlattr () throws documentexception{

Document document = GetDocument ();

Element root = Document.getrootelement ();

Element Product1 = root.element ("Product");

Get the value of the specified attribute one: Get Attribute Object

Attribute categoryattr = Product1.attribute ("category");

System.out.print ("<product" +categoryattr.getname () + "= '" +categoryattr.getvalue () + "'");

Get the specified attribute mode two: Get attribute property value directly

String Categoryvalue = product1.attributevalue ("inventory");

System.out.println ("inventory=" "+categoryvalue+" > ");

}

//product.xml documents are printed in pretty print (pretty) and compact format (compressed) style to System.out and file, respectively

@Test

public void Formatxml2system () throws Documentexception, ioexception{

Document document = GetDocument ();

/*

* Crud operation code for in-memory document objects

* ......

*/

1. Update the Document object to Product2.xml or new XML

XMLWriter writer = new XMLWriter (New FileWriter ("Webroot/product3.xml"));

Writer.write (document);

//Can call Writer.close (), close at the same time, call the Writer.flush (), but Chinese words, will appear garbled

Writer.flush ();

2. Print the Domcument object to the System.out in pretty print mode

OutputFormat format = Outputformat.createprettyprint ();

writer = new XMLWriter (System.out,format);

Writer.write (document);

Writer.flush ();

3. Print the Document object in compact format to System.out

format = Outputformat.createcompactformat ();

writer = new XMLWriter (System.out,format);

Writer.write (document);

Writer.flush ();

}

//The XML structure of the Document object is output through a recursive method

@Test

public void Printxml2system () throws documentexception{

Element root = GetDocument (). Getrootelement ();

Printelement (root);

}

///Print parameter node information, loop parameter node child node, recursive call to the method, output element node structure

public void Printelement (element Element) {

System.out.print ("<" +element.getname ());

Iterate the properties on the output LABEL element

for (Iterator<attribute> i = Element.attributeiterator (); I.hasnext ();) {

attribute = I.next ();

System.out.print ("" +attribute.getname () + "=" "+attribute.getvalue () +" ' ");

}

System.out.print (">");

Child nodes of the loop element

for (int j = 0,size = Element.nodecount (); j < size; J + +) {

node = Element.node (j);

if (node instanceof Element) {

System.out.println ();

Printelement (Element) node);

}else {

/*

* Here the. Trim () method must be, because when dom4j parsing,

* The space between the end tag and the next start tag is also an object

*/

System.out.print (Node.gettext (). Trim ());

}

}

System.out.println ("<" +element.getname () + "/>");

}

}

product2.xml File:

<?