XML基础及实践开发教程（唐琳 主编）习题答案(4)

习题8答案

1.D 2. C 3.B

4.

xmlns:fn=\

姓名

Java成绩 Oracle成绩 UML成绩

习题9答案

1. Documant、Node、Nodelist、NameNodeMap 2.package dom;

import java.io.*;

import javax.xml.parsers.*; import javax.xml.transform.*; import javax.xml.transform.dom.*; import javax.xml.transform.stream.*;

import org.w3c.dom.*;

public class TypeDoc {

public static void main(String args[]){

DocumentBuilderFactory bdf = DocumentBuilderFactory.newInstance(); try {

DocumentBuilder db =bdf.newDocumentBuilder(); Document doc = db.newDocument();

Element eltStu = doc.createElement(\ Element eltName =doc.createElement(\ Element eltAge = doc.createElement(\ Text txtName = doc.createTextNode(\

Text txtAge = doc.createTextNode(\ eltName.appendChild(txtName); eltAge.appendChild(txtAge);

eltStu.appendChild(eltName); eltStu.appendChild(eltAge); eltStu.setAttribute(\ doc.appendChild(eltStu);

TransformerFactory tff = TransformerFactory.newInstance() ; Transformer tf = tff.newTransformer(); tf.setOutputProperty(\

DOMSource source =new DOMSource(doc);

StreamResult result = new StreamResult(new File(\ tf.transform(source, result);

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

}

}

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

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

习题10答案

1.SAX事件处理器中常用的接口包括：ContentHandler、DTDHandler、EntityResolver、ErrorHandler、Attributes、DeclHandler、EntityResolver2和LexicalHandler，为了方便用户使用类库中提供了org.xml.sax.helpers.DefaultHandler和DefaultHandler2类。

2.C 3.AB 4.

DefaultReader.java代码

package exe;

import java.util.ArrayList; import java.util.Stack;

import org.xml.sax.Attributes; import org.xml.sax.SAXException;

import org.xml.sax.helpers.DefaultHandler;

public class DefaultReader extends DefaultHandler{

private ArrayList java=new ArrayList(); private ArrayList xml=new ArrayList(); private Stack stack = new Stack();

@Override

public void endDocument() throws SAXException {

double alljava = 0; double allxml = 0;

for(Double temp :java){ alljava+=temp; }

for(Double temp :xml){ allxml+=temp; }

double avgjava = alljava/java.size(); double avgxml = allxml/xml.size();

System.out.println(\成绩统计----\

System.out.println(\平均成绩为：\ System.out.println(\平均成绩为：\ }