domdemo.java

第9章 Java Web Service编程 319 实例94 使用DOM的层次模型 320 实例95 使用SAX事件模型 324 实例96 JAXP编程 327

package javawebservice;
import java.io.*;
import javax.xml.parsers.*;	
import org.xml.sax.*;
import org.w3c.dom.*;
public class DOMDemo
{
	//设置输出编码格式
	static final String outputEncoding="UTF-8";
	private PrintWriter out;
	DOMDemo(PrintWriter out)
	{
		this.out=out;
	}
	private void print(Node node)
	{
		//打印节点名称
		out.println("NodeName=\""+node.getNodeName()+"\"");
		//打印节点URI
		String value=node.getNamespaceURI();
		if(value!=null)
		{
			out.println("URL=\""+value+"\"");
		}
		//打印节点前缀
		value=node.getPrefix();
		if(value!=null)
		{
			out.println("Prefix=\""+value+"\"");
		}
		//打印节点本地名称
		value=node.getLocalName();
		if(value!=null)
		{
			out.println("LocalName=\""+value+"\"");
		}
		//打印节点值
		value=node.getNodeValue();
		if(value!=null)
		{
			out.println("NodeValue=");
			if(value.trim().equals(""))
			{
				out.println("[WS]");
			}
			else
			{
				out.println("\""+node.getNodeValue()+"\"");
			}
		}
	}
	private void echo(Node node)
	{
		int type=node.getNodeType();
		switch(type)
		{
			//属性节点
			case Node.ATTRIBUTE_NODE:
				out.println("ATTR");
				print(node);
				break;
			//CDATA
			case Node.CDATA_SECTION_NODE:
				out.println("CDATA");
				print(node);
				break;
			//注释
			case Node.COMMENT_NODE:
				out.println("COMMENT");
				print(node);
				break;
			//段落节点
			case Node.DOCUMENT_FRAGMENT_NODE:
				out.println("DOC_FRAGMENT");
				print(node);
				break;
			//文档节点
			case Node.DOCUMENT_NODE:
				out.println("DOC");
				print(node);
				break;
			//文档类型节点
			case Node.DOCUMENT_TYPE_NODE:
				out.println("DOC_TYPE");
				print(node);
				break;
			//元素节点
			case Node.ELEMENT_NODE:
				out.println("ELEMENT");
				print(node);
				//得到该节点所有属性
				NamedNodeMap atts=node.getAttributes();
				for(int i=0;i<atts.getLength();i++)
				{
					Node att=atts.item(i);
					//递归调用
					echo(att);
				}
				break;
			//实体节点
			case Node.ENTITY_NODE:
				out.println("ENTITY");
				print(node);
				break;
			//实体引用节点
			case Node.ENTITY_REFERENCE_NODE:
				out.println("ENTITY_REF");
				print(node);
				break;
			//处理说明节点
			case Node.NOTATION_NODE:
				out.println("NOTATION");
				print(node);
				break;
			//预处理节点
			case Node.PROCESSING_INSTRUCTION_NODE:
				out.println("PROC_INST");
				print(node);
				break;
			//文本节点
			case Node.TEXT_NODE:
				out.println("TEXT");
				print(node);
				break;
			//未知节点
			default:
				out.println("UNKNOWN NODE:"+type);
				print(node);
		}
		//遍历该节点子节点
		for(Node child=node.getFirstChild();
			child!=null;child=child.getNextSibling())
		{
			echo(child);
		}		
	}
	public static void main(String[] args)
	{
		//生成一个DocumentBuilderFactory
		DocumentBuilderFactory dbf=
			DocumentBuilderFactory.newInstance();
		//生成一个DocumentBuilder
		DocumentBuilder db=null;
		try
		{
			db=dbf.newDocumentBuilder();
		}
		catch(ParserConfigurationException pce)
		{
			System.out.println(pce.toString());
		}
		String fileName=args[0];
		//生成文档
		Document doc=null;
		try
		{
			//解析文档
			doc=db.parse(new File(fileName));
		}
		catch(IOException ioe)
		{
			System.out.println(ioe.toString());
		}
		catch(SAXException se)
		{
			System.out.println(se.toString());
		}
		try
		{
			//显示DOM树
			OutputStreamWriter outWriter=
				new OutputStreamWriter(System.out,outputEncoding);
			new DOMDemo(new PrintWriter(outWriter,true)).echo(doc);
		}
		catch(UnsupportedEncodingException uee)
		{
			System.out.println(uee.toString());
		}
	}
}