如何实现一个读取xml文件内容的类

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一个读取xml文件内容的类
package project.util.xml;

import java.io.*;
import java.util.*;
import javax.servlet.Http.*;
import org.apache.log4j.*;
import org.jdom.*;
import org.jdom.input.*;



public class XMLReader {

static public Logger log = Logger.getLogger(XMLReader.class);
protected Element m_RootElement = null;
protected String m_WEBAppPath = null;


public XMLReader(String xmlFile) {
m_webAppPath = null;
try {
PatternLayout layout = new PatternLayout("%-5p %d{yyyy-MM-dd HH:mm:ss} [name] %c{2} [line] %L [msg] %m%n");
ConsoleAppender appender = new ConsoleAppender(layout, "System.err");
log.addAppender(appender);

SAXBuilder builder = new SAXBuilder();
document．nbspdoc = null;
doc = builder.build(new FileInputStream(xmlFile));
m_RootElement = doc.getRootElement();
}
catch (IOException ex) {
log.error("XMLReader构造时出现IO错误:" + ex.toString());
}
catch (JDOMException ex1) {
log.error("XMLReader构造时分析XML文件出错:" + ex1.toString());
}
catch (Exception ex) {
log.error("XMLReader 构造出错:" + ex.toString());
}
}


public XMLReader(httpservlet servletObj) {
m_webAppPath = servletObj.getServletContext().getRealPath("/");
String configFileName = m_webAppPath + "XmlConfig/Config.xml";

try {
PatternLayout layout = new PatternLayout("%-5p %d{yyyy-MM-dd HH:mm:ss} [name] %c{2} [line] %L [msg] %m%n");
ConsoleAppender appender = new ConsoleAppender( layout, "System.err");
log.addAppender(appender);

SAXBuilder builder = new SAXBuilder();
document．nbspdoc = null;
doc = builder.build(new FileInputStream(configFileName));
m_RootElement = doc.getRootElement();
}
catch (IOException ex) {
log.error("XMLReader构造时出现IO错误（/XmlConfig/Config.xml）:" + ex.toString());
}
catch (JDOMException ex1) {
log.error("XMLReader构造时分析XML文件出错（/XmlConfig/Config.xml）:" + ex1.toString());
}
catch (Exception ex) {
log.error("XMLReader构造出错（/XmlConfig/Config.xml）:" + ex.toString());
}
}


public String getWebAppPath() {
return m_webAppPath;
}


public String getElementvalue(String curRootName, String key) {
String value = null;
Element curRoot = getElement(null, curRootName);
if (null == curRoot) {
curRoot = m_RootElement;
}
Element keynode = getElement(curRoot, key);
if (null != keyNode) {
value = keyNode.getTextTrim();

}
return value;
}


private Element getElement(Element curRoot, String nodeName) {
Element retElement = null;

if (null == nodeName)
return m_RootElement;

if (null == curRoot) {
curRoot = m_RootElement;
}

if (null != curRoot) {
retElement = curRoot.getChild(nodeName);
if (null == retElement) {
List nestElements = curRoot.getChildren();
Iterator iterator = nestElements.iterator();
while (iterator.hasNext() && null == retElement) {
retElement = getElement( (Element) iterator.next(), nodeName);
}
}
}

return retElement;
}


public String getElementAtrribute(String elementName, String attName)
{
Element el = getElement(null, elementName);
if (null == el)
return null;

return el.getAttributevalue(attName);
}

}

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