XML解析

Posted 2023-02-22 孤独的菜鸟----

1.XML文件

<?xml version="1.0" encoding="UTF-8"?>
<Languages cat="it">
    <lan id="1">
        <name>Java</name>
        <ide>Eclipse</ide>
    </lan>

    <lan id="2">
        <name>Swift</name>
        <ide>Xcode</ide>
    </lan>

    <lan id="3">
        <name>C#</name>
        <ide>Visual Studio</ide>
    </lan>

</Languages>

2.JAVA类

package cn.edu.qust.xml;

import java.io.IOException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class ReadXML 

    public static void main(String[] args) 

        DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder;
        try 
            builder = builderFactory.newDocumentBuilder();
            // 读取文档，注意文件路径
            Document document =  builder.parse("./src/languages.xml");
            // 获取根节点
            Element element = document.getDocumentElement();
            // 获取节点标签名，属性值
            System.out.println(element.getTagName() + " cat " + element.getAttribute("cat"));
            NodeList list = element.getElementsByTagName("lan");

            for (int i = 0; i < list.getLength(); i++) 
                System.out.println("==============");
                // 进行类型转换，否则报类型装换异常
                Element lanNode = (Element) list.item(i);
                System.out.println("id = " + lanNode.getAttribute("id"));
                NodeList chlidList = lanNode.getChildNodes();
                for (int j = 0; j < chlidList.getLength(); j++) 
                    Node child = chlidList.item(j);
                    if (child instanceof Element) 
                        System.out.println(child.getNodeName() + " = " + child.getTextContent());                       
                    
                
            
         catch (ParserConfigurationException e) 
            // TODO Auto-generated catch block
            e.printStackTrace();
         catch (SAXException e) 
            // TODO Auto-generated catch block
            e.printStackTrace();
         catch (IOException e) 
            // TODO Auto-generated catch block
            e.printStackTrace();
        
    

3.打印日志

Languages   cat it
==============
id = 1
name = Java
ide = Eclipse
==============
id = 2
name = Swift
ide = Xcode
==============
id = 3
name = C#
ide = Visual Studio