Java、XML与数据库编程实践 (二)
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
{
staticStringxmlfile;
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;
}
publicConnPara 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
privateString getChildElementValue(Node node,String suBTagName)
{
String returnString = "";
if(node !