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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>
posted on 2014-07-29 17:05 冯威威 阅读(508) 评论(0)  编辑  收藏 所属分类: JAVA基础类

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