java读写和修改XML文件

Message.xml文件:

<?xml version="1.0" encoding="UTF-8"?>

<users>

<Messages>
<sendName>sendUsers</sendName>
<receiveName>snake</receiveName>
<date>2007-12-04 12:20:00</date>
<status>0</status>
<message>this is Content</message>
</Messages>

</users>

java:

package com.lianxi.DAO;
import java.io.File;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
public class UpdateXml {
 public static boolean doc2XmlFile(Document document,String filename) 
    { 
      boolean flag = true; 
      try 
       { 
            /** 将document中的内容写入文件中   */ 
             TransformerFactory tFactory = TransformerFactory.newInstance();    
             Transformer transformer = tFactory.newTransformer();  
            /** 编码 */ 
            //transformer.setOutputProperty(OutputKeys.ENCODING, "GB2312"); 
             DOMSource source = new DOMSource(document);  
             StreamResult result = new StreamResult(new File(filename));    
             transformer.transform(source, result);  
         }catch(Exception ex) 
         { 
             flag = false; 
             ex.printStackTrace(); 
         } 
        return flag;       
    }
 
 public static Document load(String filename) 
    { 
       Document document = null; 
      try  
       {  
            DocumentBuilderFactory   factory = DocumentBuilderFactory.newInstance();    
            DocumentBuilder builder=factory.newDocumentBuilder();    
            document=builder.parse(new File(filename));    
            document.normalize(); 
       } 
      catch (Exception ex){ 
           ex.printStackTrace(); 
       }   
      return document; 
    }
   /** 
     *   演示修改文件的具体某个节点的值  
     */ 
   public static void xmlUpdateDemo() 
    { 
       Document document = load("c://Message.xml"); 
       Node root=document.getDocumentElement(); 
      /** 如果root有子元素 */ 
      if(root.hasChildNodes()) 
       { 
         /** ftpnodes */ 
          NodeList ftpnodes = root.getChildNodes(); 
         /** 循环取得ftp所有节点 */ 
         for (int i=0;i<ftpnodes.getLength();i++) 
          {                       
             NodeList ftplist = ftpnodes.item(i).getChildNodes(); 
            for (int k=0;k<ftplist.getLength();k++) 
             { 
               Node subnode = ftplist.item(k); 
              /** 删除ftp-chn节点 */ 
//              if (subnode.getNodeType()==Node.ELEMENT_NODE&&subnode.getNodeName()=="ftp-chn") 
//               { 
//                  ftpnodes.item(i).removeChild(subnode); 
//               } 
              /** 修改ftp-host的值为 192.168.0.1 */ 
              if (subnode.getNodeType()==Node.ELEMENT_NODE&&subnode.getNodeName()=="status") 
               {                  
                  subnode.getFirstChild().setNodeValue("1"); 
               } 
             } 
             
          } 
       } 
     
       doc2XmlFile(document,"c://Message.xml"); 
    }
   public static void main(String args[])throws Exception
   {
    UpdateXml.xmlUpdateDemo();
   }
}

转自：http://zhidao.baidu.com/question/46959510