domparsertest.java

关于xml的

package parser;

import java.io.File;

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

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

public class DomParserTest {

	public static void main(String[] args) throws Exception{
		DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();
		DocumentBuilder builder=factory.newDocumentBuilder();
		Document doc=builder.parse(new File("test01.xml"));
		//输出预处理指令
		//1,得到根元素
		//2,输出Element 1输出头标签   2输出属性   3得到所有子节点   4如果子节点是Text，则直接输出    5如果子节点是Element,则递归调用输出Element方法6.输出结束标签
		System.out.print("<?xml version=\""+doc.getXmlVersion()+"\"");
		System.out.print(" encoding=\""+doc.getXmlEncoding()+"\"");
		System.out.println(" standalone=\""+(doc.getXmlStandalone()?"yes":"no")+"\"?>");
		Element e=doc.getDocumentElement();
		printElement(e);
		
	}
	public static void printElement(Element e){
		System.out.print("<"+e.getTagName());
		NamedNodeMap map=e.getAttributes();
		for(int i=0;i<map.getLength();i++){
			Attr att=(Attr)map.item(i);
			System.out.print(att.getName()+"=\""+att.getValue()+"\"");
			
		}
		System.out.print(">");
		NodeList list=e.getChildNodes();
		for(int i=0;i<list.getLength();i++){
			Node n=list.item(i);
			if(n.getNodeType()==Node.ELEMENT_NODE){
				Element temp=(Element)n;
				printElement(temp);
			}else{
				System.out.println(n.getTextContent().trim());
			}
		}
		System.out.println("</"+e.getTagName()+">");
	}

}