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java¶ÁÈ¡XMLÎļþÀïÃæµÄÊý¾ÝÖ®DOMʵÏÖ

import org.w3c.dom.*;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import java.io.*;
public class ReadXML {
private File file;

public ReadXML(String filename){
File file=new File(filename);
this.file=file;
}
/**
*
* @return the instance of Document
*/
public Document getDOM(){
DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance();
DocumentBuilder db;
Document document=null;
try{
db=dbf.newDocumentBuilder();
document=db.parse(file);
}catch(Exception e ){
e.printStackTrace();
}
return document;
}

/**
*
* @param tagName
* @return
*/
public String getInfoByTagName(String tagName)
{
String info="";
Document document=this.getDOM();

//»ñÈ¡NodeName ΪtagNameµÄ½Úµã×é
NodeList nl=document.getElementsByTagName(tagName);

for(int i=0;i<nl.getLength();i++)
{
info+=tagName+"[+"+i+"+]"+"\n";
Node node=nl.item(i);

//Èç¹ûµ±Ç°½ÚµãÓÐ×ӽڵ㣨ÕâÀï Ö»¿¼ÂÇ»¹ÓÐÒ»¼¶×Ó½ÚµãµÄÇé¿ö£©
if(node.hasChildNodes())
{

NodeList list=node.getChildNodes();

for(int j=0;j<list.getLength();j++)
{

Node childNode=list.item(j);
/* ²»¼ÓÕâ¸öIfÓï¾ä»áÅ׳ö
* Exception in thread "main" java.lang.NullPointerException
* at ReadXML.getInfoByTagName(ReadXML.java:59)
* at Test.main(Test.java:17)
*/
if(childNode.getFirstChild()!=null)
/* ¶ÔgetNodeValue()µÄ¹ý³Ì³¹µ×ÎÞÓï
* µ÷ÊÔÕâ¸öµØ·½µÄʱºò£¬ÔÚÍøÉϺÜÈÝÒ×ÕÒµ½ÁË
* Ôڵõ½ValueµÄʱºò±ØÐëÔÚ½Úµã¶ÔÏóºóÃæÏȵ÷ÓÃgetFirstChild()»òÕßgetChildNodes().item(0)
* Ô­ÒòºÜ¼òµ¥£¬µ«ÊDz»ÖªµÀÉè¼ÆÕßÎÊʲôҪÕâôÉè¼Æ
* ×î½üÔÚ¿´¡¶Be


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import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.huadoo.model.Area;
public class Aaaa {
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