{"id":51271,"date":"2017-11-02T11:00:45","date_gmt":"2017-11-02T09:00:45","guid":{"rendered":"http:\/\/examples.javacodegeeks.com\/?p=51271"},"modified":"2017-10-31T10:29:45","modified_gmt":"2017-10-31T08:29:45","slug":"java-xpathfactory-example","status":"publish","type":"post","link":"https:\/\/examples.javacodegeeks.com\/java-development\/core-java\/xml\/xpath\/java-xpathfactory-example\/","title":{"rendered":"Java XPathFactory Example"},"content":{"rendered":"

In this example, we will see what is java XPathFactory<\/code> and its usage with example.\u00a0Before we start with this article, it is expected that we have a basic understanding of\u00a0XML. XML stands for eXtensible Markup Language, which is designed to store and transport data. It is both human and machine readable.<\/p>\n

1. Introduction<\/h2>\n

XPathFactory<\/code> is an abstract class in java that extends
\njava.lang.Object<\/code>.\u00a0An\u00a0XPathFactory<\/code>\u00a0instance can be used to create
\nXPath<\/code>\u00a0objects.\u00a0XPath<\/code> is a standard syntax recommended by the W3C.
\nXPath<\/code> is a major element in the XSLT standard that\u00a0can be used to navigate through expressions, elements and attributes in an XML document. XPath<\/code> expressions help us to navigate to the desired node in an XML that we want to retrieve.
\nJava\u00a0classes\u00a0from\u00a0java.xml.xpath<\/code>\u00a0package e.g.\u00a0XPath,\u00a0XPathFactory\u00a0and\u00a0XPathExpression are used to create and evaluate Xpath<\/code> in Java.<\/p>\n

In this example, we will see how to use XPathFactory<\/code>,\u00a0newInstance()<\/code> method to get a XPath<\/code> instance and traverse the XML.<\/p>\n

2. Demonstration<\/h2>\n

Let us write a java program to demonstrate how to get a new XPathFactory<\/code> instance, create XPath<\/code> expression and how to execute XPath<\/code> expression to retrieve text value, numeric and boolean value.<\/p>\n

2.1 Creating a java project<\/h3>\n

Create a new java project in eclipse using File -> New ->Java Project. Enter the project name “XPathFactoryExample” and a new java project should get created. Refer screenshot below.<\/p>\n

\"\"<\/a>
Fig 1: Creating a Java project<\/figcaption><\/figure><\/p>\n

2.2 Creating a new\u00a0XPathFactoryExample class<\/h3>\n

Create a new java class naming XPathFactoryExample.java<\/code> using, Right Click on java project->New->Class.<\/p>\n

\"\"<\/a>
Fig 2: Create new java class<\/figcaption><\/figure><\/p>\n

2.3 XPathFactoryExample.java<\/h3>\n

After creating a new class,\u00a0Refer the code below for\u00a0XPathFactoryExample.java<\/code>.<\/p>\n

XPathFactoryExample.java<\/em><\/span><\/p>\n

package com.xpath.example;\r\n\r\nimport java.io.IOException;\r\nimport javax.xml.parsers.DocumentBuilder;\r\nimport javax.xml.parsers.DocumentBuilderFactory;\r\nimport javax.xml.parsers.ParserConfigurationException;\r\nimport javax.xml.xpath.XPath;\r\nimport javax.xml.xpath.XPathConstants;\r\nimport javax.xml.xpath.XPathExpression;\r\nimport javax.xml.xpath.XPathExpressionException;\r\nimport javax.xml.xpath.XPathFactory;\r\nimport org.w3c.dom.Document;\r\nimport org.w3c.dom.NodeList;\r\nimport org.xml.sax.SAXException;\r\n\r\n\/\/XPathFactoryExample -Java example\r\npublic class XPathFactoryExample { \r\n\r\npublic void xPathProcessor() throws SAXException, IOException, XPathExpressionException, ParserConfigurationException {\r\n   \/\/ Create DocumentBuilderFactory for reading xml file DocumentBuilderFactory factory = \r\n   DocumentBuilderFactory.newInstance(); \r\n   DocumentBuilder builder = factory.newDocumentBuilder(); \r\n   Document doc = builder.parse(\"smartphone.xml\");\r\n\r\n   \/\/ Create XPathFactory for creating XPath Object \r\n   XPathFactory xPathFactory = XPathFactory.newInstance();\r\n   \/\/ Create XPath object from XPathFactory \r\n   XPath xpath = xPathFactory.newXPath();\r\n   \/\/ Compile the XPath expression for getting all brands \r\n   XPathExpression xPathExpr = xpath.compile(\"\/smartphones\/smartphone\/brand\/text()\");\r\n\r\n   \/\/ XPath text example : executing xpath expression in java Object\r\n   result = xPathExpr.evaluate(doc, XPathConstants.NODESET); \r\n   System.out.println(\"Java Xpath text example: All brands of popular smartphones \"); \r\n   printXpathResult(result);\r\n\r\n   \/\/ get all models by xpath expression in java \r\n   xPathExpr = xpath.compile(\"\/smartphones\/smartphone\/model\/text()\"); \r\n   result = xPathExpr.evaluate(doc, XPathConstants.NODESET); \r\n   System.out.println(\"Java Xpath text example: All popular smartphone model \"); \r\n   printXpathResult(result);\r\n\r\n   \/\/ XPath count example : XPath expression to count elements in xml \r\n   xPathExpr = xpath.compile(\"count(\/smartphones\/smartphone)\"); \r\n   Double count = (Double) xPathExpr.evaluate(doc, XPathConstants.NUMBER); \r\n   System.out.println(\"XPath count example: How many Smartphones we have: \"); \r\n   System.out.println(\"Count of elements: \" + count);\r\n\r\n   \/\/ XPath conditional exampl e: Do we have any HTC smartphone xPath\r\n   Expr = xpath.compile(\"count(\/smartphones\/smartphone[brand='HTC']) > 0\"); \r\n   Boolean test = (Boolean) xPathExpr.evaluate(doc, XPathConstants.BOOLEAN); \r\n   System.out.println(\"XPath boolean example: Do we have any HTC smartphone \"); \r\n   System.out.println(test);\r\n}\r\n\r\n\/** \r\n* Method to print result on console \r\n* @param result \r\n*\/ \r\npublic void printXpathResult(Object result) { \r\n   NodeList nodes = (NodeList) result; \r\n   for (int i = 0; i < nodes.getLength(); i++) { \r\n   System.out.println(nodes.item(i).getNodeValue()); \r\n   } \r\n}\r\n\r\n\/\/Main class to run the example. \r\npublic static void main(String[] args) throws XPathExpressionException, ParserConfigurationException, SAXException, IOException {\r\n   XPathFactoryExample xPathExample = new XPathFactoryExample(); \r\n   xPathExample.xPathProcessor(); \r\n   }\r\n}\u00a0\r\n<\/pre>\n
2.4 Creating smartphone.xml<\/h3>\n
Create a new xml by Right click on Java project ->New ->Other. Search for XML.
 
<\/div> <\/div><\/p>\n
\"\"<\/a>
Fig 3: Creating new xml<\/figcaption><\/figure><\/p>\n
Select XML -> XML File and click Next.<\/p>\n
\"\"<\/a>
Fig 4: New XML file<\/figcaption><\/figure><\/p>\n
Select the recently created project and enter the XML filename i.e. smartphone.xml that we\u00a0are using in our XPathFactory.java<\/code> class and click Finish. A new XML gets created in the project root directory. Refer screenshot below.<\/p>\n
\"\"<\/a>
Fig 5: XML filename<\/figcaption><\/figure><\/p>\n
2.5 Project directory structure<\/h3>\n
Refer project directory structure below.<\/p>\n
\"\"<\/a>
Fig 6: Project directory structure<\/figcaption><\/figure><\/p>\n
2.6 smartphone.xml content<\/h3>\n
Here is the content of smartphone.xml.<\/p>\n
smartphone.xml<\/em><\/span><\/p>\n
<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n<smartphones> \r\n   <smartphone> \r\n      <brand> \r\n         <text>\r\n            Samsung           \r\n         <\/text> \r\n      <\/brand> \r\n      <model> \r\n          Note3 \r\n      <\/model> \r\n   <\/smartphone> \r\n   <smartphone> \r\n      <brand> \r\n         <text> \r\n            Apple \r\n         <\/text> \r\n      <\/brand> \r\n      <model> \r\n         IPhone8 \r\n      <\/model> \r\n   <\/smartphone>\r\n<\/smartphones>\r\n<\/pre>\n
2.7 Eclipse output<\/h3>\n
Run the project by Right click on project -> Run As -> Java Application.<\/p>\n
\"\"<\/a>
Fig 7: Run Java Project<\/figcaption><\/figure><\/p>\n
We can see the output as below when we run the project.<\/p>\n
\"\"<\/a>
Fig 7: Project output<\/figcaption><\/figure><\/p>\n
3. Conclusion<\/h2>\n
The output shows, how we get XPathFactory<\/code> instance, and parse the smartphone.xml<\/code> file. We have also seen how a new XPath<\/code> object has been created and a\u00a0XPathExpression<\/code> has been executed\u00a0to retrieve text value, numeric value and boolean value.<\/p>\n
4. Download the Eclipse Project<\/h2>\n
This was an example of using XPathFactory.<\/p>\n
Download<\/strong>
\nYou can download the full source code of this example here: XpathFactoryExample<\/strong><\/a><\/div>\n","protected":false},"excerpt":{"rendered":"
In this example, we will see what is java XPathFactory and its usage with example.\u00a0Before we start with this article, it is expected that we have a basic understanding of\u00a0XML. XML stands for eXtensible Markup Language, which is designed to store and transport data. It is both human and machine readable. 1. Introduction XPathFactory is …<\/p>\n","protected":false},"author":125,"featured_media":1204,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[75],"tags":[1682],"class_list":["post-51271","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-xpath","tag-xpathfactory"],"yoast_head":"\nJava XPathFactory Example - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"In this example, we will see what is java XPathFactory and its usage with example.\u00a0Before we start with this article, it is expected that we have a basic\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/examples.javacodegeeks.com\/java-development\/core-java\/xml\/xpath\/java-xpathfactory-example\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java XPathFactory Example - 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