DOM读取XML文件

水深无声 2022-09-29 05:18 270阅读 0赞

创建XML文件：

<?xml version="1.0" encoding="utf-8"?>
    <bookstore>
        
        <book Type="必修课">
            <title>数据结构</title>
            <author>张三</author>
            <price>30.00</price>
        </book>
        <book Type="必修课" >
            <title>java基础</title>
            <author>李四</author>
            <price>40.00</price>
        </book>
        <book Type="必修课" >
            <title>计算机组成原理</title>
            <author>王五</author>
            <price>50.00</price>
        </book>
        <book Type="必修课">
            <title>软件质量保证与管理</title>
            <author>赵六</author>
            <price>60.00</price>
        </book>
        <book Type="必修课" >
            <title>算法设计与分析</title>
            <author>李七</author>
            <price>70.00</price>
        </book>
    </bookstore>

--------------------

工厂模式进行XML解析：

import java.io.File;
    
    import javax.xml.parsers.DocumentBuilder;
    import javax.xml.parsers.DocumentBuilderFactory;
    
    import org.w3c.dom.Document;
    import org.w3c.dom.NodeList;
    
    
    public class DOMReadXML {
    
        public static void main(String[] args) {
    
    
            try{
    
                File file = new File("XmlDemo.xml");
    
                DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    
                DocumentBuilder builder = factory.newDocumentBuilder();
    
                Document doc = builder.parse(file);
    
                NodeList nl = doc.getElementsByTagName("book");
    
                for(int i=0; i<nl.getLength();i++){ 
    
                    System.out.print("书名:"+ doc.getElementsByTagName("title").item(i).getFirstChild().getNodeValue()); 
                    System.out.println("作者:"+ doc.getElementsByTagName("author").item(i).getFirstChild().getNodeValue()); 
                    System.out.println("价格:"+ doc.getElementsByTagName("price").item(i).getFirstChild().getNodeValue()); 
                }
    
    
    
    
            }catch (Exception e) { 
                e.printStackTrace(); 
            }
        }
    }

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运行结果：  
![这里写图片描述][SouthEast]

[SouthEast]: /images/20220708/b5d0869603da432b829371ec5901f477.png