java修改xml文件

java修改xml文件

原始的message.xml
<? xml version = " 1.0 "  encoding = " UTF-8 " ?>< users >
     < Messages >
         < sendName > sendUsers </ sendName >
         < receiveName > snake </ receiveName >
         < date > 2007 - 12 - 04   12 : 20 : 00 </ date >
         < status > 1 </ status >
         < message > this  is Content </ message >
     </ Messages >
</ users >

java程序
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  {
           
            TransformerFactory tFactory  =  TransformerFactory.newInstance();
            Transformer transformer  =  tFactory.newTransformer();
           
             //  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;
    }

   
     public   static   void  xmlUpdateDemo() {
        Document document  =  load( " message.xml " );
        Node root  =  document.getDocumentElement();
       
         if  (root.hasChildNodes()) {
           
            NodeList ftpnodes  =  root.getChildNodes();
           
             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);
                   
                     //  if (subnode.getNodeType()==Node.ELEMENT_NODE&&subnode.
                     //  getNodeName()=="ftp-chn")
                     //  {
                     //  ftpnodes.item(i).removeChild(subnode);
                     //  }
                   
                     if  (subnode.getNodeType()  ==  Node.ELEMENT_NODE
                             &&  subnode.getNodeName()  ==   " status " ) {
                        subnode.getFirstChild().setNodeValue( " 9 " );
                    }
                }

            }
        }

        doc2XmlFile(document,  " message.xml " );
    }

     public   static   void  main(String args[])  throws  Exception {
        UpdateXml.xmlUpdateDemo();
    }
}

修改后的message.xml
<? xml version = " 1.0 "  encoding = " UTF-8 " ?>< users >
     < Messages >
         < sendName > sendUsers </ sendName >
         < receiveName > snake </ receiveName >
         < date > 2007 - 12 - 04   12 : 20 : 00 </ date >
         < status > 9 </ status >
         < message > this  is Content </ message >
     </ Messages >
</ users >