JDOM XML Parser

本文主要是介绍JDOM XML Parser，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

  JDOM provides a way to represent that document for easy and efficient reading, manipulation, and writing. It’s an alternative（替代） to DOM and SAX.

JDOM官网： http://jdom.org/
GitHub: https://github.com/hunterhacker/jdom/

JDOM是第三方jar:

Gradle:

compile group: 'org.jdom', name: 'jdom2', version: '2.0.6'

Maven:

<dependency><groupId>org.jdom</groupId><artifactId>jdom2</artifactId><version>2.0.6</version>
</dependency>

1.0 How to read XML file in Java – (JDOM Parser)

<?xml version="1.0"?>
<company><staff><firstname>yong</firstname><lastname>mook kim</lastname><nickname>mkyong</nickname><salary>100000</salary></staff><staff><firstname>low</firstname><lastname>yin fong</lastname><nickname>fong fong</nickname><salary>200000</salary></staff>
</company>

import java.io.File;
import java.io.IOException;
import java.util.List;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;public class ReadXMLFile {public static void main(String[] args) {SAXBuilder builder = new SAXBuilder();File xmlFile = new File("c:\\file.xml");try {Document document = (Document) builder.build(xmlFile);Element rootNode = document.getRootElement();List list = rootNode.getChildren("staff");for (int i = 0; i < list.size(); i++) {Element node = (Element) list.get(i);System.out.println("First Name : " + node.getChildText("firstname"));System.out.println("Last Name : " + node.getChildText("lastname"));System.out.println("Nick Name : " + node.getChildText("nickname"));System.out.println("Salary : " + node.getChildText("salary"));}} catch (IOException io) {System.out.println(io.getMessage());} catch (JDOMException jdomex) {System.out.println(jdomex.getMessage());}}
}

Output

First Name : yong
Last Name : mook kim
Nick Name : mkyong
Salary : 100000
First Name : low
Last Name : yin fong
Nick Name : fong fong
Salary : 200000

2.0 How to modify XML file in Java – (JDOM Parser)

File : file.xml – Original XML file.

<?xml version="1.0" encoding="UTF-8"?>
<company><staff id="1"><firstname>yong</firstname><lastname>mook kim</lastname><nickname>mkyong</nickname><salary>5000</salary></staff>
</company>

File : file.xml – Newly modified XML file.

<?xml version="1.0" encoding="UTF-8"?>
<company><staff id="2"><lastname>mook kim</lastname><nickname>mkyong</nickname><salary>7000</salary><age>28</age></staff>
</company>

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;public class ModifyXMLFile {public static void main(String[] args) {try {SAXBuilder builder = new SAXBuilder();File xmlFile = new File("c:\\file.xml");Document doc = (Document) builder.build(xmlFile);Element rootNode = doc.getRootElement();// update staff id attributeElement staff = rootNode.getChild("staff");staff.getAttribute("id").setValue("2");// add new age elementElement age = new Element("age").setText("28");staff.addContent(age);// update salary valuestaff.getChild("salary").setText("7000");// remove firstname elementstaff.removeChild("firstname");XMLOutputter xmlOutput = new XMLOutputter();// display nice nicexmlOutput.setFormat(Format.getPrettyFormat());xmlOutput.output(doc, new FileWriter("c:\\file.xml"));// xmlOutput.output(doc, System.out);System.out.println("File updated!");} catch (IOException io) {io.printStackTrace();} catch (JDOMException e) {e.printStackTrace();}}
}

3.0 How to create XML file in Java – (JDOM Parser)

import java.io.FileWriter;
import java.io.IOException;
import org.jdom.Attribute;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;public class WriteXMLFile {public static void main(String[] args) {try {Element company = new Element("company");Document doc = new Document(company);doc.setRootElement(company);Element staff = new Element("staff");staff.setAttribute(new Attribute("id", "1"));staff.addContent(new Element("firstname").setText("yong"));staff.addContent(new Element("lastname").setText("mook kim"));staff.addContent(new Element("nickname").setText("mkyong"));staff.addContent(new Element("salary").setText("199999"));doc.getRootElement().addContent(staff);Element staff2 = new Element("staff");staff2.setAttribute(new Attribute("id", "2"));staff2.addContent(new Element("firstname").setText("low"));staff2.addContent(new Element("lastname").setText("yin fong"));staff2.addContent(new Element("nickname").setText("fong fong"));staff2.addContent(new Element("salary").setText("188888"));doc.getRootElement().addContent(staff2);// new XMLOutputter().output(doc, System.out);XMLOutputter xmlOutput = new XMLOutputter();// display nice nicexmlOutput.setFormat(Format.getPrettyFormat());xmlOutput.output(doc, new FileWriter("c:\\file.xml"));System.out.println("File Saved!");} catch (IOException io) {System.out.println(io.getMessage());}}
}````Result:<div class="se-preview-section-delimiter"></div>```xml
<?xml version="1.0" encoding="UTF-8"?>
<company><staff id="1"><firstname>yong</firstname><lastname>mook kim</lastname><nickname>mkyong</nickname><salary>199999</salary></staff><staff id="2"><firstname>low</firstname><lastname>yin fong</lastname><nickname>fong fong</nickname><salary>188888</salary></staff>
</company>

  
JDOM学习相关文档
http://www.studytrails.com/java/xml/jdom2/java-xml-jdom2-introduction/
https://www.journaldev.com/1206/jdom-parser-read-xml-file-object-java

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