Java 读取XML文件(DOM实现)详解编程语言

步骤概括如下：

• 1、获取DocumentBuilderFactory

• 2、通过DocumentBuilder工厂产生一个DocumentBuilder

• 3、利用DocumentBuilder产生Document

下面通过简单的代码来实现上面描述的过程：

import org.w3c.dom.Document; 
import org.w3c.dom.NodeList; 
 
import java.io.File; 
 
import javax.xml.parsers.DocumentBuilder; 
import javax.xml.parsers.DocumentBuilderFactory; 
 
 
public class ParseXML { 
    public void parseXML() { 
        try { 
            File f = new File("user.xml"); 
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); // 步骤1 
            DocumentBuilder builder = factory.newDocumentBuilder(); // 步骤2 
            Document doc = builder.parse(f); // 步骤3 
            NodeList nl = doc.getElementsByTagName("obj"); // 读取obj节点下的内容 
 
            for (int i = 0; i < nl.getLength(); i++) { 
                String name = doc.getElementsByTagName("NAME").item(i).getFirstChild().getNodeValue(); 
                String phone = doc.getElementsByTagName("PHONE").item(i).getFirstChild().getNodeValue(); 
                String age = doc.getElementsByTagName("AGE").item(i).getFirstChild().getNodeValue(); 
 
                System.out.println("NAME: " + name + ", PHONE: " + phone +  ", AGE: " + age); 
            } 
        } catch (Exception e) { 
            e.printStackTrace(); 
        } 
    } 
 
    public static void main(String[] args) { 
        ParseXML px = new ParseXML(); 
        px.parseXML(); 
    } 
} 

运行结果如下：

NAME: 张三, PHONE: 18612345678, AGE: 22 
NAME: 李四, PHONE: 13012345678, AGE: 25

user.xml

<returnData>  
  <page>  
    <currentPage>1</currentPage>   
    <countPage>10</countPage>  
  </page>   
  <data>  
    <obj>  
      <NAME>张三</NAME>   
      <PHONE>18612345678</PHONE>   
      <AGE>22</AGE>  
    </obj>   
    <obj>  
      <NAME>李四</NAME>   
      <PHONE>13012345678</PHONE>   
      <AGE>25</AGE>  
    </obj>  
  </data>  
</returnData>

作者：blog.ytso.com