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we can add our knowledge and modify the code such that as soon as we get required information while traversing the tree, we just use it. Here we are iterating over all elements present in XML document tree.
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In some cases, we may have to write the code in such a way such that even if there is some differences in assumed XML structure while coding, program must work without failure. Previous example shows the way we can iterate over an XML document parsed with known or little know structure to you, while you are writing the code. If (node.getNodeType() = Node.ELEMENT_NODE)ĮtId(Integer.parseInt(eElement.getAttribute("id"))) ĮtFirstName(eElement.getElementsByTagName("firstName").item(0).getTextContent()) ĮtLastName(eElement.getElementsByTagName("lastName").item(0).getTextContent()) ĮtLocation(eElement.getElementsByTagName("location").item(0).getTextContent()) Private static List parseEmployeesXML() throws ParserConfigurationException, SAXException, IOExceptionįor (int temp = 0 temp < nList.getLength() temp++) ("=") įor (int temp = 0 temp employees = parseEmployeesXML() NodeList nList = document.getElementsByTagName("employee") Normalize the XML Structure It's just too important !!ĭocument.getDocumentElement().normalize() In real life application, we will use this information for some real purpose rather than printing it on console and leave.ĭocument document = builder.parse(new File("employees.xml")) In below example code, I am assuming that user is already aware of the structure of employees.xml file (it’s nodes and attributes) So example directly start fetching information and start printing it in console. Node.getChildNodes() //returns a list of all child nodes Node.getElementsByTagName("subElementName") //returns a list of sub-elements of specified name We can examine the xml element attributes using below methods.Įlement.getAttribute("attributeName") //returns specific attributeĮlement.getAttributes() //returns a Map (table) of names/valuesĬhild elements can inquired in below manner. We can get the root element from XML document using below code.Įlement root = document.getDocumentElement() Validator.validate(new DOMSource(document)) Validator validator = schema.newValidator() Schema = factory.newSchema(new File(name)) SchemaFactory factory = SchemaFactory.newInstance(language) String language = XMLConstants.W3C_XML_SCHEMA_NS_URI XML validation is optional but good to have it before start parsing. Create Document object from xml fileĭocument document = builder.parse(new File( file )) Next step is to create the DocumentBuilder object.ĭocumentBuilderFactory factory = DocumentBuilderFactory.newInstance() ĭocumentBuilder builder = factory.newDocumentBuilder() ġ.3. We will need to import dom parser packages first in our application. Let’s note down some broad steps to create and use DOM parser to parse a XML file in java. Read More : Difference between DOM parser and SAX parserįor example purpose, We will be parsing below xml content in all code examples.
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DOM Parser API -Import XML-related packages -Create a DocumentBuilder -Create a Document from a file or stream -Validate Document structure -Extract the root element -Examine attributes -Examine sub-elements 2. Now we can traverse the DOM structure back and forth as we want – to get/update/delete data from it. Once the parser is done with parsing process, we get this tree-like DOM object structure back from it. These DOM objects are linked together in a tree like structure. In first, the parser traverses the input XML file and creates DOM objects corresponding to the nodes in XML file. DOM parser is intended for working with XML as an object graph (a tree like structure) in memory – so called “ Document Object Model (DOM)“. In this Java xml parser tutorial, Learn to read xml with DOM parser in Java.