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今天就跟大家聊聊有關(guān)java如何通過XPath解析xml節(jié)點,可能很多人都不太了解,為了讓大家更加了解,小編給大家總結(jié)了以下內(nèi)容,希望大家根據(jù)這篇文章可以有所收獲。
import java.io.File; import java.io.FileInputStream; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.xpath.XPath; import javax.xml.xpath.XPathConstants; import javax.xml.xpath.XPathFactory; import org.w3c.dom.Document; import org.w3c.dom.Node; import org.w3c.dom.NodeList; public class FindElementsByAbsoluteLocationWithXPath { public static void main(String[] args) throws Exception { DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); dbf.setValidating(false); DocumentBuilder db = dbf.newDocumentBuilder(); Document doc = db.parse(new FileInputStream(new File("in.xml"))); XPathFactory factory = XPathFactory.newInstance(); XPath xpath = factory.newXPath(); String expression; Node node; NodeList nodeList; // 1. root element expression = "/*"; node = (Node) xpath.evaluate(expression, doc, XPathConstants.NODE); System.out.println("1. " + node.getNodeName()); // 2. root element (by name) expression = "/rss"; node = (Node) xpath.evaluate(expression, doc, XPathConstants.NODE); System.out.println("2. " + node.getNodeName()); // 3. element under rss expression = "/rss/channel"; node = (Node) xpath.evaluate(expression, doc, XPathConstants.NODE); System.out.println("3. " + node.getNodeName()); // 4. all elements under rss/channel expression = "/rss/channel/*"; nodeList = (NodeList) xpath.evaluate(expression, doc, XPathConstants.NODESET); System.out.print("4. "); for (int i = 0; i < nodeList.getLength(); i++) { System.out.print(nodeList.item(i).getNodeName() + " "); } System.out.println(); // 5. all title elements in the document expression = "//title"; nodeList = (NodeList) xpath.evaluate(expression, doc, XPathConstants.NODESET); System.out.print("5. "); for (int i = 0; i < nodeList.getLength(); i++) { System.out.print(nodeList.item(i).getNodeName() + " "); } System.out.println(); // 6. all elements in the document except title expression = "//*[name() != 'title']"; nodeList = (NodeList) xpath.evaluate(expression, doc, XPathConstants.NODESET); System.out.print("6. "); for (int i = 0; i < nodeList.getLength(); i++) { System.out.print(nodeList.item(i).getNodeName() + " "); } System.out.println(); // 7. all elements with at least one child element expression = "//*[*]"; nodeList = (NodeList) xpath.evaluate(expression, doc, XPathConstants.NODESET); System.out.print("7. "); for (int i = 0; i < nodeList.getLength(); i++) { System.out.print(nodeList.item(i).getNodeName() + " "); } System.out.println(); // 8. all level-5 elements (the root being at level 1) expression = "/*/*/*/*"; nodeList = (NodeList) xpath.evaluate(expression, doc, XPathConstants.NODESET); System.out.print("8. "); for (int i = 0; i < nodeList.getLength(); i++) { System.out.print(nodeList.item(i).getNodeName() + " "); } System.out.println(); } }
Input:
<?xml version="1.0" encoding="UTF-8"?> <rss version="2.0"> <channel> <title>Java Tutorials and Examples 2</title> <language>en-us</language> <item> <title><![CDATA[Java Tutorials 2]]></title> <link>http://www.javacodegeeks.com/</link> </item> <item> <title><![CDATA[Java Examples 2]]></title> <link>http://examples.javacodegeeks.com/</link> </item> </channel> </rss>
輸出:
1. rss 2. rss 3. channel 4. title language item item 5. title title title 6. rss channel language item link item link 7. rss channel item item 8. title link title link
看完上述內(nèi)容,你們對java如何通過XPath解析xml節(jié)點有進一步的了解嗎?如果還想了解更多知識或者相關(guān)內(nèi)容,請關(guān)注億速云行業(yè)資訊頻道,感謝大家的支持。
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