Java、XML与数据库编程实践(二)

王朝java/jsp·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

文件DbXmlParser.java封装了对xml文件的操作。

import javax.xml.parsers.*;

import org.w3c.dom.*;

import org.xml.sax.*;

import java.io.*;

public class DbXmlParser

{

static String xmlfile;

public DbXmlParser(String filename)

{

xmlfile=filename;

}

public static Element loadDocument()

{

try

{

//工厂

DocumentBuilderFactory dcfactory=DocumentBuilderFactory.newInstance();

//文档构造器

DocumentBuilder db=dcfactory.newDocumentBuilder();

//构造的文档

Document doc=db.parse(xmlfile);

//根元素

Element root=doc.getDocumentElement();

return root;

}catch( ParserConfigurationException e){

System.out.println("ParserConfigurationException");

e.printStackTrace();

}catch(IOException e) {

System.out.println("IOException ");

e.printStackTrace();

}catch(SAXException e) {

System.out.println("SAXException ");

e.printStackTrace();

}catch(Exception e) {

e.printStackTrace();

}

return null;

}

public ConnPara getSource()

{

Element root=loadDocument();

if( root==null) { return null; }

NodeList nodes=root.getElementsByTagName("source");

if(nodes.getLength()>0)

{

Node node=nodes.item(0);

String connclass=getChildElementValue(node,"class");

String url=getChildElementValue(node,"url");

String username=getChildElementValue(node,"user");

String password=getChildElementValue(node,"password");

return new ConnPara(connclass,url,username,password);

}

return null;

}

public ConnPara getDest()

{

Element root=loadDocument();

if( root==null) return null;

NodeList nodes=root.getElementsByTagName("dest");

if(nodes.getLength()>0)

{

Node node=nodes.item(0);

String connclass=getChildElementValue(node,"class");

String url=getChildElementValue(node,"url");

String username=getChildElementValue(node,"user");

String password=getChildElementValue(node,"password");

return new ConnPara(connclass,url,username,password);

}

return null;

}

//得到子元素的值

private String getChildElementValue(Node node,String subTagName)

{

String returnString = "";

if(node != null)

{

NodeList children = node.getChildNodes();

for(int innerLoop = 0; innerLoop < children.getLength(); innerLoop++)

{

Node child = children.item(innerLoop);

if(child == null || child.getNodeName() == null || !child.getNodeName().equals(subTagName))

continue;

Node grandChild = child.getFirstChild();

if(grandChild.getNodeValue() != null)

return grandChild.getNodeValue();

}

}

return returnString;

}

}

 
 
 
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