DOM解析XML文件

1.DOM解析XML文件

<?xml version="1.0" encoding="UTF-8"?>
<groups>
	<group name="group1" ap_num="3">
		<ap name="ap1_1" mac="00:00:00:00:01:01" ip="127.0.1.1">1</ap>
		<ap name="ap1_2" mac="00:00:00:00:01:02" ip="127.0.1.2">2</ap>
		<ap name="ap1_3" mac="00:00:00:00:01:03" ip="127.0.1.3">3</ap>
	</group>
	<group name="group2" ap_num="4">
		<ap name="ap2_1" mac="00:00:00:00:02:01" ip="127.0.2.1"></ap>
		<ap name="ap2_2" mac="00:00:00:00:02:02" ip="127.0.2.2"></ap>
		<ap name="ap2_3" mac="00:00:00:00:02:03" ip="127.0.2.3"></ap>
		<ap name="ap2_4" mac="00:00:00:00:02:04" ip="127.0.2.4"></ap>
	</group>
	<group name="group3" ap_num="2">
		<ap name="ap3_1" mac="00:00:00:00:03:01" ip="127.0.3.1"></ap>
		<ap name="ap3_2" mac="00:00:00:00:03:02" ip="127.0.3.2"></ap>
	</group>
</groups>

 

package dom;

import java.io.InputStream;

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

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class DomParseTest {
	public void test() throws Exception{
		InputStream input = this.getClass().getClassLoader().getResourceAsStream("dom/ap_group.xml");
		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();   
        Document document = builder.parse(input);
        Element element = document.getDocumentElement();
        //group 节点
        NodeList groupNodes = element.getElementsByTagName("group");  
        for(int i=0;i<groupNodes.getLength();i++){
        	Element groupElement = (Element) groupNodes.item(i);
        	System.out.println(groupElement.getAttribute("name"));
        	//group下的子节点
        	NodeList apNodes = groupElement.getChildNodes();
        	System.out.println("    字节点个数："+apNodes.getLength());
        	for(int j=0;j<apNodes.getLength();j++){
        		if(apNodes.item(j).getNodeType()==Node.ELEMENT_NODE){
        			Element apElement = (Element) apNodes.item(j);
        			System.out.println("      value个数:"+apElement.getChildNodes().getLength());
        			NodeList valueNodes = apElement.getChildNodes();
        			for(int k=0;k<valueNodes.getLength();k++){
        				System.out.println("        "+valueNodes.item(k).getNodeValue());
        			}
            		System.out.println("      ap属性name值"+apElement.getAttribute("name"));
        		}
        	}
        }
        input.close();
	}
	public static void main(String[] args) {
		DomParseTest test = new DomParseTest();
		try {
			test.test();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}