Using the XML parsing development package JAXP to perform a DOM-style crud operation on an XML file

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

Import java.io.FileNotFoundException;

Import Java.io.FileOutputStream;

Import Javax.xml.parsers.DocumentBuilder;

Import Javax.xml.parsers.DocumentBuilderFactory;

Import Javax.xml.transform.Transformer;

Import javax.xml.transform.TransformerConfigurationException;

Import javax.xml.transform.TransformerException;

Import Javax.xml.transform.TransformerFactory;

Import Javax.xml.transform.dom.DOMSource;

Import Javax.xml.transform.stream.StreamResult;

Import Org.junit.Test;

Import org.w3c.dom.Document;

Import org.w3c.dom.Element;

/**

* Test CRUD Operations on document objects

**/

public class Jaxpdomcrud {

Parse the XML document and get the document that represents it

Public Document GetDocument () {

Documentbuilderfactory factory = Documentbuilderfactory.newinstance ();

Documentbuilder builder = null;

Document document = NULL;

try {

Builder = Factory.newdocumentbuilder ();

Document = Builder.parse ("Webroot/product1.xml");

} catch (Exception e) {

TODO auto-generated Catch block

E.printstacktrace ();

}

return document;

}

Update the in-memory modified document object to an XML document

public void Updatexml (Document documentsrc) {

Get Transformerfactory Instance Object

Transformerfactory transformerfactory = Transformerfactory.newinstance ();

Creating transformer objects from Transformerfactory objects

Transformer Transformer = null;

try {

Transformer = Transformerfactory.newtransformer ();

} catch (Transformerconfigurationexception E1) {

TODO auto-generated Catch block

E1.printstacktrace ();

}

/*

* Call the transform (Source xmlsource, Result outputtarget) method of the Transformer object

* Public class Domsource extends Object implements Source

* Construction Method: Domsource (Node N)

* Public class Streamresult extends Object implements Result

* Construction Method: Streamresult (OutputStream outputstream)

*/

try {

Transformer.transform (New Domsource (DOCUMENTSRC),

New Streamresult (New FileOutputStream ("Webroot/product1.xml"));

} catch (FileNotFoundException e) {

TODO auto-generated Catch block

E.printstacktrace ();

} catch (Transformerexception e) {

TODO auto-generated Catch block

E.printstacktrace ();

}

}

Add nodes to <product category= table > Nodes <notes> This is a table and chair </notes>

@Test

public void Appendnode () {

Get the Document object for the XML documents

Document document = GetDocument ();

Create <notes> new node

Element notes = document.createelement ("notes");

Notes.setattribute ("name", "Xiao Hua");

Notes.settextcontent ("This is the table and Chair");

Append a new node created to the second <product> node

Element product = (Element) document.getElementsByTagName ("Product"). Item (1);

Product.appendchild (Notes);

Updating an XML document

Updatexml (document);

}

Adds a node to the specified location in an XML document:<notes> This is a table </notes> chairs

@Test

public void Insertnode () {

Get the Document object for the XML documents

Document document = GetDocument ();

Create <notes> new node

Element notes = document.createelement ("notes");

Notes.setattribute ("name", "Xiao Hua");

Notes.settextcontent ("This is the table and Chair");

Get reference node

Element Refnode = (Element) document.getelementsbytagname ("Price"). Item (1);

Insert the new node you created under the Second <product> node sub-node <price> front

Element product = (Element) document.getElementsByTagName ("Product"). Item (1);

Product.insertbefore (notes, Refnode);

Updating an XML document

Updatexml (document);

}

To specify a node for an XML document to add or modify or delete properties

@Test

public void Setorupdateattr () {

Get the Document object for the XML documents

Document document = GetDocument ();

For <notes> This is the Wrench </notes> node Add property

Element Notesnode = (Element) document.getElementsByTagName ("notes"). Item (0);

Notesnode.setattribute ("name", "Cao Huan");

For <price street= "Macau Street" wholesale= "section" >100.0</price> Modify attribute values

Element Pricenode = (Element) document.getelementsbytagname ("Price"). Item (1);

Pricenode.setattribute ("wholesale", "small");

Remove <specifications weight= "2.0kg" > Wrench </specifications> Weight Properties

Element Specificationsnode = (Element) document.getElementsByTagName ("Specifications"). Item (0);

Specificationsnode.removeattribute ("Weight");

Updating an XML document

Updatexml (document);

}

Delete the specified node in the XML document <notes name= "Cao Huan" > This is a wrench </notes>

@Test

public void Deletenode () {

Get the Document object for the XML documents

Document document = GetDocument ();

Get the node you want to delete

Element Notesnode = (Element) document.getElementsByTagName ("notes"). Item (0);

Gets the parent node of the node to be deleted, and throws a nullpointerexception if the Notenode node is null

Element parentnode = (Element) Notesnode.getparentnode ();

Element parentnode = (Element) document.getElementsByTagName ("Product"). Item (1);

Child nodes removed by parent node

Parentnode.removechild (Notesnode);

Updating an XML document

Updatexml (document);

}

Modifying the contents of element elements

@Test

public void Updatecontexttext () {

Get the Document object for the XML documents

Document document = GetDocument ();

Pricenode can only be a child node of a Productnode node

Element Productnode = (Element) document.getElementsByTagName ("Product"). Item (0);

Element Pricenode = (Element) productnode.getelementsbytagname ("Price"). Item (0);

Pricenode.settextcontent ("90.0");

Updating an XML document

Updatexml (document);

}

}

Product1.xml File Contents:

<?xml version= "1.0" encoding= "Utf-8" standalone= "no"?> <catalog id= "Cata1" > <product category= "Handtool" > <specifications> Wrench </specifications> <price street= "Hong Kong Street" >90.0</price> </product> <product category= "Table" > <specifications> Tables </specifications> <notes name= "Xiao Hua" > This is the table and chairs </notes> <price street= "Macau Street" wholesale= "small" >100.0</price> </product> </catalog>