[Source Code]Java I/O --- ---使用dom读取一个xml文件的叶子节点的text content

示例xml文件：

<?xml version="1.0" encoding="UTF-8"?>
<A>
 <ONE single="true">
          <aa>aa1</aa>
          <bb>bb1</bb>
          <cc>cc1</cc>
        </ONE>
 <TWO single="true">
          <aa>aa2</aa>
          <bb>bb2</bb>
          <cc>cc2</cc>
 </TWO> 
 <THREE>
 three
 </THREE>
</A>

 

源代码：

package com.mycompany.xmltest;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.HashMap;

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

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

public class ARead {

 /*
  * Reload this method to get text contents within a leaf of any level
  *
  * @Return null if there is no such a leaf
  */
 public Object getXml(String key1, String key2, String key3) {
  HashMap retMap = readXmlFile(new File("F://a.xml"));
  if (!retMap.isEmpty()) {
   Object obj = retMap.get(key1);
   if (obj instanceof HashMap) {
    retMap = (HashMap) obj;
    if (!retMap.isEmpty()) {
     obj = retMap.get(key2);
     if (obj instanceof HashMap) {
      retMap = (HashMap) obj;
      if (!retMap.isEmpty()) {
       return retMap.get(key3);
      }
     }
    }
   }
  }
  return null;
 }

 private HashMap readXmlFile(File thefile) {
  HashMap map = new HashMap();

  BufferedReader bfreader = null;
  DocumentBuilder docbuilder = null;
  Document doc = null;

  try {
   bfreader = new BufferedReader(new FileReader(thefile));
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  }

  DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
  try {
   docbuilder = factory.newDocumentBuilder();
  } catch (ParserConfigurationException e) {
   e.printStackTrace();
  }

  try {
   doc = docbuilder.parse(new InputSource(bfreader));
  } catch (SAXException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  } finally {
   try {
    bfreader.close();
   } catch (IOException e) {
    e.printStackTrace();
   }
  }

  if (doc.hasChildNodes()) {
   NodeList nlist_01 = doc.getChildNodes();
   parseChild(nlist_01, map);
  }

  return map;
 }

 /*
  * Recursive call
  */
 private void parseChild(NodeList nlist, HashMap themap) {
  for (int i = 0; i < nlist.getLength(); i++) {
   Node node = nlist.item(i);
   if (node.hasChildNodes()
     && node.getFirstChild().getNextSibling() != null) {
    HashMap sonMap = new HashMap();
    parseChild(node.getChildNodes(), sonMap);
    themap.put(node.getNodeName(), sonMap);
   } else {
    if (node.getTextContent() != null
      && !"".equals(node.getTextContent())) {
     themap.put(node.getNodeName(), node.getTextContent());
    }
   }
  }

 }

 public static void main(String[] args) {
  ARead test = new ARead();
  System.out.println(test.getXml("A", "ONE", "aa"));
  System.out.println(test.getXml("A", "ONE", "cc"));
  System.out.println(test.getXml("A", "TWO", "bb"));
 }
}