java读写xml文件

java源代码

import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.io.InputStream;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.parsers.ParserConfigurationException;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.Element;import org.w3c.dom.NodeList;import org.w3c.dom.Node;import org.xml.sax.SAXException;public class Operate { public static void main(String[] args) throws Exception { WriteXML(".//conf//12.xml", "searcher.dir", "123"); System.err.println(ReadXML(".//conf//12.xml","searcher.dir")); } public static String ReadXML(String path,String name) throws Exception{ DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance(); DocumentBuilder db=dbf.newDocumentBuilder(); InputStream is=new FileInputStream(path); Document doc=db.parse(is); Element root=doc.getDocumentElement(); NodeList datas=root.getChildNodes(); String str=""; if(datas!=null){ for(int i=0;i<datas.getLength();i++){ Node data=datas.item(i); if(data.getNodeType()==Node.ELEMENT_NODE){ for(Node node=data.getFirstChild();node!=null;node=node.getNextSibling()){ if(node.getNodeType()==Node.ELEMENT_NODE){ if(node.getNodeName().equals("name")&&node.getTextContent().equals(name)){ NodeList nl=node.getParentNode().getChildNodes(); for (int k = 0; k <nl.getLength(); k++) {  if (nl.item(k).getNodeName().contains("value")) {str=nl.item(k).getTextContent();} } } } } } } } return str; } public static void WriteXML(String path,String name,String value){ DocumentBuilderFactory domfac=DocumentBuilderFactory.newInstance(); try { DocumentBuilder dombuilder=domfac.newDocumentBuilder(); InputStream is=new FileInputStream(path); Document doc=dombuilder.parse(is); Element root=doc.getDocumentElement(); NodeList datas=root.getChildNodes(); if(datas!=null){ for(int i=0;i<datas.getLength();i++){ Node data=datas.item(i); if(data.getNodeType()==Node.ELEMENT_NODE){ for(Node node=data.getFirstChild();node!=null;node=node.getNextSibling()){  if(node.getNodeName().equals("name")&&node.getTextContent().equals(name)){ NodeList nl=node.getParentNode().getChildNodes(); for (int k = 0; k <nl.getLength(); k++) {  if (nl.item(k).getNodeName().contains("value")) {nl.item(k).setTextContent(value);} } } } } } } doc2XmlFile(doc, path); System.err.println("success"); } catch (ParserConfigurationException e) { e.printStackTrace(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (SAXException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } public static boolean doc2XmlFile(Document document, String filename) {        boolean flag = true;        try {                       TransformerFactory tFactory = TransformerFactory.newInstance();            Transformer transformer = tFactory.newTransformer();            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;    } }

xml结构

<?xml version="1.0" encoding="UTF-8" standalone="no"?><?xml-stylesheet type="text/xsl" href="configuration.xsl"?>    http.agent.name    my nutch agent    http.agent.version    1.2    searcher.dir    123    index dir