Dom parsing differs in Java and JavaScript

Summarize the differences between using DOM to parse XML files in Java and JavaScript

1. Different ways to generate DOM document objects

A in JavaScript, create the DOM document object code as follows:

Creating an XML document

Varxmldoc = new ActiveXObject ("Microsoft.XMLDOM");

Setting does not support asynchronous

Xmldoc.async= false;

Load XML file

Xmldoc.load ("Demo03.xml");

B in Java, create the DOM document object code as follows:

Create a parser Project object

Publicdocument document;

Documentbuilderfactory factory =documentbuilderfactory.newinstance ();

Create a Parser object

Documentbuilderbuilder = Factory.newdocumentbuilder ();

Create an XML file in memory of the tree node model

Document=builder.parse (DomReaderXML.class.getClassLoader (). getResourceAsStream ("XML file"));

2. Gets the root node and the property name and the property value method

C. Get in javascript:

Varroot = xmldoc.documentelement//Get root node

varnode=xmldoc.documentelement.childnodes[0];//nodes under the root node

document.write ("<br/>===" +node.basename);//basename, for output node labels

node type, where 1 represents the element node, 2 represents the attribute node, and 3 represents the text node

document.write ("<br/> node type:" +node.nodetype+ "<br/>");

document.write ("root element node name:" +node.ownerdocument.documentelement.tagname+ "<br/>");

document.write ("Property name of the current node:" +node.attributes[0].name+ "<br/>");

document.write ("Property value of current node:" +node.attributes[0].value);

document.write ("<br/> the text contained in the current node and its child nodes" +node.text);

D in Java to obtain:

Convert data in an XML document into a collection object

Get all Student node collections

Nodelistnodes = document.getElementsByTagName ("student");

List<student>stulist = new arraylist<student> ();

Label name and attribute for loop output node

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

Student stu = new Student ();

Convert to Element elements object

element element = (Element) nodes.item (i);

System.out.println (Element.getnodename ());

Property value

String id = element.getattribute ("id");

Stu.setid (ID);

NodeList Childs =element.getchildnodes ();

String name =document.getelementsbytagname ("name"). Item (i). Getfirstchild (). Getnodevalue ();

Stu.setname (name);

String strage =document.getelementsbytagname ("Age"). Item (i). Getfirstchild (). Getnodevalue ();

Stu.setage (Integer.parseint (strage));

String sex = document.getelementsbytagname ("Sex"). Item (i)-getfirstchild (). Getnodevalue ();

Stu.setsex (Sex);

Stulist.add (Stu);

}

After the load is complete, the XML file is used to find the node.

NodeList nodelist = document.getelementsbytagname ("student");

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

Elementstuelement = (Element) nodelist.item (i);

Get the value of a property

String idvalue =stuelement.getattribute ("id");

SYSTEM.OUT.PRINTLN ("id attribute value" +idvalue);

NodeList child =stuelement.getchildnodes ();

for (int j=0;j<child.getlength (); j + +) {

if (Child.item (j). Getnodetype () ==node.element_node) {

System.out.println (Node.element_node);

System.out.println (Child.item (j). Getnodetype ());

Node node = Child.item (j); System.out.println (Node.getnodename () + "= =" +node.gettextcontent ());

}

}