XML解析入门之JDOM（二）

遍历DOM

 

package com.liuc.test;

import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;

import org.jdom2.Attribute;
import org.jdom2.Comment;
import org.jdom2.Document;
import org.jdom2.Element;
import org.jdom2.JDOMException;
import org.jdom2.Namespace;
import org.jdom2.input.SAXBuilder;

public class XmlIterator {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		interatorXML(new File("person.xml"));
	}

	/**
	 * Element类的getContent()方法返回一个List对象
	 * 它包括了一个元素的所有内容：注释、属性、处理指令、
	 * 文本和子元素。利用它我们可以遍历XML文档
	 * @param xmlFile
	 */
	public static void interatorXML(File xmlFile){
		
		try {
			SAXBuilder sax=new SAXBuilder();
			Document document=sax.build(xmlFile);
			prcess(document.getRootElement());
		} catch (JDOMException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		
	}

	private static void prcess(Element element) {
		inspect(element);
		List contentList=element.getContent();
		Iterator it=contentList.iterator();
		while(it.hasNext()){
			Object o=it.next();
			if (o instanceof Element) {
				Element child=(Element)o;
				prcess(child);
			}else if(o instanceof Comment){
				Comment c=(Comment) o;
				System.out.println(c.getText());
				System.out.println();
			}
		}
	}

	private static void inspect(Element element) {
		if(!element.isRootElement()){
			System.out.println();
		}
		
		String qualifiedName=element.getQualifiedName();
		System.out.println(element.getName()+":"+element.getText());
		Namespace namespace=element.getNamespace();
		if (namespace!=Namespace.NO_NAMESPACE) {
			String localName=element.getName();
			String uri=element.getNamespaceURI();
			String prefix=element.getNamespacePrefix();
			System.out.println("  Local name: "+localName); 
            System.out.println("  Namespace URI: "+uri); 
			
            if (!"".equals(prefix)) {
				System.out.println("NameSpace prefix"+prefix);
			}
		}
		
		List attList=element.getAttributes();
		if (!attList.isEmpty()) {
			Iterator it=attList.iterator();
			while(it.hasNext()){
				Attribute attribute=(Attribute) it.next();
				String name=attribute.getName();
				String value=attribute.getValue();
				Namespace attributeNamespace=attribute.getNamespace();
				if (attributeNamespace==Namespace.NO_NAMESPACE) {
					System.out.println("  "+name+ "=\""+value+ "\"");
				}else {
					String prefix=attributeNamespace.getPrefix();
					 System.out.println("  "+prefix+":"+name+"=\""+value+"\""); 
				}
			}
		}
		
		List namespaceList=element.getAdditionalNamespaces();
		if (!namespaceList.isEmpty()) {
			Iterator iterator=namespaceList.iterator();
			while(iterator.hasNext()){
				Namespace additional=(Namespace) iterator.next();
				String uri=additional.getURI();
				String prefix=additional.getPrefix();
				System.out.println("  xmlns:"+prefix+"=\""+uri+"\""); 
			}
		}
	}
}

XML文件

<?xml version="1.0" encoding="UTF-8"?>
<persons>
  <person perid="1001">
    <name>zhangsan</name>
    <age>89</age>
    <address>安徽淮北</address>
    <sex>男</sex>
  </person>
  <person perid="1002">
    <name>lisi</name>
    <age>56</age>
    <address>北京海淀</address>
    <sex>女</sex>
  </person>
</persons>