我现在需要一个接口来修改xml文件中的一些系统配置，使得这些被指信息可以不用由程序员事先设定，那这样的接口要怎样写呢？我在网上找了下面这个例子。
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import javax.xml.parsers.*;
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import javax.xml.transform.Transformer;
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import javax.xml.transform.TransformerException;
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import javax.xml.transform.TransformerFactory;
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import javax.xml.transform.dom.DOMSource;
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import javax.xml.transform.stream.StreamResult;
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import org.w3c.dom.*;
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import org.xml.sax.*;
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public class XmlModifier {
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public XmlModifier() {
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DocumentBuilderFactory domfac = DocumentBuilderFactory.newInstance();//定义一个XML文件的解析器
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try {
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DocumentBuilder dombuilder = domfac.newDocumentBuilder();//定义一个API来获取XML文件
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InputStream is = new FileInputStream("assets/XMLConfig.xml");
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//文档
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Document doc = dombuilder.parse(is);//解析来自InputStream的文件，创建为doc文件树
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//根节点
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Element root = doc.getDocumentElement();
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//根下的子节点
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NodeList books = root.getChildNodes();
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if (books != null) {
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for (int i = 0; i < books.getLength(); i++) {
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Node book = books.item(i);
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if (book.getNodeType() == Node.ELEMENT_NODE) {
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String MAP = book.getAttributes().getNamedItem("MAP").getNodeValue();
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System.out.println(MAP);
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//子节点的子节点
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for (Node node = book.getFirstChild(); node != null; node = node.getNextSibling()) {
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if (node.getNodeType() == Node.ELEMENT_NODE) {
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if (node.getNodeName() == "LOCATIONMETHOD") {
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//String name = node.getNodeValue();
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String LocationMethod = node.getFirstChild().getNodeValue();
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//System.out.println(name);
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System.out.println(LocationMethod);
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node.setTextContent("GPRS");
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}
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if (node.getNodeName() == "DOUBLECLCKZOOM") {
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String DoubleClickZoom = node.getFirstChild().getNodeValue();
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System.out.println(DoubleClickZoom);
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//修改字段
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node.setTextContent("false");
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}
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if(node.getNodeName()=="UPDATEPOSIONTIME"){
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String UpDatePositionTime = node.getFirstChild().getNodeValue();
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System.out.println(UpDatePositionTime);
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node.setTextContent("5");
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}
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}
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}
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}
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}
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//保存文件作用
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writeXML(doc, "NewFile.xml");
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}
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} catch (ParserConfigurationException e) {
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// TODO: handle exception
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e.printStackTrace();
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//System.out.println("解析错误");
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} catch (FileNotFoundException e) {
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e.printStackTrace();
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//System.out.println("文件查找失败");
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} catch (SAXException e) {
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e.printStackTrace();
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//System.out.println("接口错误");
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} catch (IOException e) {
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e.printStackTrace();
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//System.out.println("输入/输出错误");
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}
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}
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/**
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* @param args
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public static void main(String[] args) {
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// TODO Auto-generated method stub
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new XmlModifier();
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}
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//保存新的Document
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private static void writeXML(Document doc, String file) {
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try {
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Transformer t = TransformerFactory.newInstance().newTransformer();
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t.setOutputProperty("indent", "yes");
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t.transform(new DOMSource(doc), new StreamResult(newFileOutputStream(file)));
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} catch (TransformerException e) {
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e.printStackTrace();
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} catch (FileNotFoundException e) {
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e.printStackTrace();
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}
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}
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//创建新Document
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private static void newDocument(DocumentBuilder db) throws SAXException, IOException {
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Document doc = db.newDocument();
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Element root = doc.createElement("root");
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doc.appendChild(root);
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root.appendChild(doc.createElement("new"));
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writeXML(doc, "new.xml");
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}
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}
但是运行时Console报错：
#
# A fatal error has been detected by the Java Runtime Environment:
#
#Internal Error (classFileParser.cpp:3494), pid=4108, tid=4612
#Error: ShouldNotReachHere()
#
# JRE version: 6.0_25-b06
# Java VM: Java HotSpot(TM) Client VM (20.0-b11 mixed mode windows-x86 )
# An error report file with more information is saved as:
# D:\AndroidWork\XmlConfigReader_Writer\hs_err_pid4108.log
#
# If you would like to submit a bug report, please visit:
#http://java.sun.com/webapps/bugreport/crash.jsp
#
请大家指教。
XMLConfig.xml文件如下：
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<?xml version="1.0" encoding="utf-8" ?>
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<MAP>
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<LOCATIONMETHOD>ID</LOCATIONMETHOD>
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<DOUBLECLICKZOOM>true</DOUBLECLICKZOOM>
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<UPDATEPOSITIONTIME>1</UPDATEPOSITIONTIME>
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</MAP>
