102、XML 文档定义有几种形式?它们之间有何本质区别?解析XML 文档有哪几种方式?【基础】 答:
103、你在项目中用到了xml 技术的哪些方面?如何实现的? 【中等难度】 答:用到了数据存贮,信息配置两方面。在做数据交换平台时,将不能数据源的数据组装成XML 文件,然后将XML 文件压缩打包加密后通过网络传送给接收者,接收解密与解压缩后再同XML 文件中还原相关信息进行处理。在做软件配置时,利用XML 可以很方便的进行,软件的各种配置参数都存贮在XML 文件中。
104、用jdom 解析xml 文件时如何解决中文问题?如何解析? 【较难】 答:看如下代码,用编码方式加以解决
public class DOMTest{
private String inFile = "c:\people.xml";
private String outFile = "c:\people.xml";
public static void main(String args[]){
new DOMTest();
}
public DOMTest(){
try{
javax.xml.parsers.DocumentBuilder builder =
javax.xml.parsers.DocumentBuilderFactory.
newInstance().newDocumentBuilder();
org.w3c.dom.Document doc = builder.newDocument();
org.w3c.dom.Element root = doc.createElement("老师");
org.w3c.dom.Element wang = doc.createElement("王");
org.w3c.dom.Element liu = doc.createElement("刘");
wang.appendChild(doc.createTextNode("我是王老师"));
root.appendChild(wang);
doc.appendChild(root);
javax.xml.transform.Transformer transformer =
javax.xml.transform.TransformerFactory.
newInstance().newTransformer();
transformer.setOutputProperty(
javax.xml.transform.OutputKeys.ENCODING,"gb2312");
transformer.setOutputProperty(
javax.xml.transform.OutputKeys.INDENT, "yes");
transformer.transform(new
javax.xml.transform.dom.DOMSource(doc),
new javax.xml.transform.stream.StreamResult(outFile));
}catch (Exception e){
System.out.println (e.getMessage());
}
}
}
105、编程用JAVA 解析XML 的方式。【较难】 答:用SAX 方式解析XML,XML 文件如下:
<?xml version="1.0" encoding="gb2312"?>
<person>
<name>王小明</name>
<college>信息学院</college>
<telephone>6258113</telephone>
<notes>男,1955 年生,博士,95 年调入海南大学</notes>
</person>
事件回调类SAXHandler.java :
public class SAXHandler extends HandlerBase {
private Hashtable table = new Hashtable();
private String currentElement = null;
private String currentValue = null;
public void setTable(Hashtable table){
this.table = table;
}
public Hashtable getTable(){
return table;
}
public void startElement(String tag, AttributeList attrs)
throws SAXException{
currentElement = tag;
}
public void characters(char[] ch, int start, int length)
throws SAXException{
currentValue = new String(ch, start, length);
}
public void endElement(String name) throws SAXException{
if (currentElement.equals(name))
table.put(currentElement, currentValue);
}
}
JSP 内容显示源码,SaxXml.jsp:
<HTML>
<HEAD>
<TITLE>剖析XML 文件people.xml</TITLE>
</HEAD>
<BODY>
<%@ page errorPage="ErrPage.jsp"
contentType="text/html;charset=GB2312" %>
<%@ page import="java.io.*" %>
<%@ page import="java.util.Hashtable" %>
<%@ page import="org.w3c.dom.*" %>
<%@ page import="org.xml.sax.*" %>
<%@ page import="javax.xml.parsers.SAXParserFactory" %>
<%@ page import="javax.xml.parsers.SAXParser" %>
<%@ page import="SAXHandler" %>
<%
File file = new File("c:\people.xml");
FileReader reader = new FileReader(file);
Parser parser;
SAXParserFactory spf = SAXParserFactory.newInstance();
SAXParser sp = spf.newSAXParser();
SAXHandler handler = new SAXHandler();
sp.parse(new InputSource(reader), handler);
Hashtable hashTable = handler.getTable();
out.println("<TABLE BORDER=2><CAPTION>" +
"教师信息表</CAPTION>");
out.println("<TR><TD>姓名</TD>" + "<TD>" +
(String)hashTable.get(new String("name")) +
"</TD></TR>");
out.println("<TR><TD>学院</TD>" + "<TD>" +
(String)hashTable.get(new String("college"))
+"</TD></TR>");
out.println("<TR><TD>电话</TD>" + "<TD>" +
(String)hashTable.get(new String("telephone"))
+ "</TD></TR>");
out.println("<TR><TD>备注</TD>" + "<TD>" +
(String)hashTable.get(new String("notes"))
+ "</TD></TR>");
out.println("</TABLE>");
%>
</BODY>
</HTML>