Java JDOM解析器 - 解析XML文檔

使用JDOM的步驟

以下是解析時使用JDOM解析器文檔的步驟。

• 導入XML相關的軟件包

• 創建一個SAXBuilder

• 從文件或流創建一個文檔

• 提取根元素

• 檢查屬性

• 檢查子元素

導入XML相關的軟件包

import java.io.*; import java.util.*; import org.jdom2.*;

創建DocumentBuilder

SAXBuilder saxBuilder = new SAXBuilder();

從文件或流創建一個文檔

File inputFile = new File("input.txt"); SAXBuilder saxBuilder = new SAXBuilder(); Document document = saxBuilder.build(inputFile);

提取根元素

Element classElement = document.getRootElement();

檢查屬性

//returns specific attribute getAttribute("attributeName");

檢查子元素

//returns a list of subelements of specified name getChildren("subelementName"); //returns a list of all child nodes getChildren(); //returns first child node getChild("subelementName");

演示示例

這是輸入需要解析xml文件：

dinkar kad dinkar 85 Vaneet Gupta vinni 95 jasvir singn jazz 90

演示示例：

DomParserDemo.java

import java.io.File; import java.io.IOException; import java.util.List; import org.jdom2.Attribute; import org.jdom2.Document; import org.jdom2.Element; import org.jdom2.JDOMException; import org.jdom2.input.SAXBuilder; public class JDomParserDemo { public static void main(String[] args) { try { File inputFile = new File("input.txt"); SAXBuilder saxBuilder = new SAXBuilder(); Document document = saxBuilder.build(inputFile); System.out.println("Root element :" + document.getRootElement().getName()); Element classElement = document.getRootElement(); List<Element> studentList = classElement.getChildren(); System.out.println("----------------------------"); for (int temp = 0; temp < studentList.size(); temp++) { Element student = studentList.get(temp); System.out.println("\nCurrent Element :" + student.getName()); Attribute attribute = student.getAttribute("rollno"); System.out.println("Student roll no : " + attribute.getValue() ); System.out.println("First Name : " + student.getChild("firstname").getText()); System.out.println("Last Name : "+ student.getChild("lastname").getText()); System.out.println("Nick Name : "+ student.getChild("nickname").getText()); System.out.println("Marks : "+ student.getChild("marks").getText()); } }catch(JDOMException e){ e.printStackTrace(); }catch(IOException ioe){ ioe.printStackTrace(); } } }

這將產生以下結果：

Root element :class

Current Element :student
Student roll no : 393
First Name : dinkar
Last Name : kad
Nick Name : dinkar
Marks : 85

Current Element :student
Student roll no : 493
First Name : Vaneet
Last Name : Gupta
Nick Name : vinni
Marks : 95

Current Element :student
Student roll no : 593
First Name : jasvir
Last Name : singn
Nick Name : jazz
Marks : 90