XML基础及实践开发教程（唐琳 主编）习题答案(6)

}

@Override

public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException { stack.push(qName); }

@Override

public void endElement(String uri, String localName, String qName) throws SAXException { stack.pop(); }

@Override

public void characters(char[] ch, int start, int length) throws SAXException { String tag = stack.peek(); if(\

java.add(Double.parseDouble(new String(ch,start,length))); }else if(\

xml.add(Double.parseDouble(new String(ch,start,length))); } }

Test.java代码

package exe;

import java.io.IOException;

import org.xml.sax.InputSource; import org.xml.sax.SAXException; import org.xml.sax.XMLReader;

import org.xml.sax.helpers.XMLReaderFactory;

public class Test {

public static void main(String[] args) { try {

XMLReader reader = XMLReaderFactory.createXMLReader(); reader.setContentHandler(new DefaultReader()); reader.parse(new InputSource(\ } catch (SAXException e) {

System.out.println(\

}

} catch (IOException e) {

System.out.println(\ } }

习题11答案

1.使用JDOM实现文件的修改 import java.io.File;

import java.io.FileOutputStream; import java.io.IOException;

import org.jdom2.Document; import org.jdom2.Element;

import org.jdom2.JDOMException; import org.jdom2.input.SAXBuilder; import org.jdom2.output.Format;

import org.jdom2.output.XMLOutputter;

public class JDOMExe {

public static void main(String[] args) { //读取XML文档

SAXBuilder saxBuilder = new SAXBuilder(); try {

Document doc = saxBuilder.build(new File(\ Element root = doc.getRootElement(); //修改XML文档 //增加元素

Element eltdescription = new Element(\ eltdescription.setText(\一款复古又时尚的新概念皮鞋\ root.addContent(eltdescription); //修改学生信息

Element eltprice = root.getChild(\ eltprice.setText(\

//输出XML文档

XMLOutputter out = new XMLOutputter(); //格式化输出

Format fmt = Format.getPrettyFormat(); fmt.setEncoding(\ fmt.setIndent(\ out.setFormat(fmt); try {

out.output(doc, new FileOutputStream(\ } catch (IOException e) {

// TODO Auto-generated catch block

}

}

e.printStackTrace(); }

} catch (JDOMException | IOException e) { // TODO Auto-generated catch block e.printStackTrace(); }

2.使用DOM4J实现文件的修改 import java.io.File;

import java.io.FileWriter; import java.io.IOException;

import java.io.UnsupportedEncodingException; import java.util.Iterator;

import org.dom4j.Document;

import org.dom4j.DocumentException; import org.dom4j.Element;

import org.dom4j.io.OutputFormat; import org.dom4j.io.SAXReader; import org.dom4j.io.XMLWriter;

public class Dom4jExe {

public static void main(String[] args) { SAXReader sr = new SAXReader(); //忽略标签与标签之间的空白

sr.setStripWhitespaceText(true); //将相邻元素的内容合并处理 sr.setMergeAdjacentText(true); //读取XML文档 try {

Document doc = sr.read(new File(\ Element root = doc.getRootElement(); Iterator its = root.nodeIterator(); while(its.hasNext()){

Object temp = its.next(); if(temp instanceof Element){ Element elt = (Element)temp;

if(elt.getName().equals(\ //修改元素内容

elt.setText(\

}

}

} } }

//增加元素

Element eltdescription = root.addElement(\eltdescription.setText(\一款复古又时尚的新概念皮鞋\

//格式化输出

OutputFormat outFmt = new OutputFormat(\ //输出到文件

FileWriter fw = new FileWriter(\ XMLWriter xmlWriter = new XMLWriter(fw,outFmt); xmlWriter.write(doc); fw.close();

} catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) {

// TODO Auto-generated catch block e.printStackTrace();

} catch (DocumentException e) {

// TODO Auto-generated catch block e.printStackTrace(); }