java读取xml文件

import java.io.File;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.Iterator;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
public class ReadSetting {
private Element eroot = null;

public void setRootElementByPath (String path) {
File f = new File(path);
Element root = null;
if(f.exists())
{
SAXReader reader = new SAXReader();
Document doc;
try {
doc = reader.read(f);
root = doc.getRootElement();
} catch (DocumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
eroot = root;
}
public Map getSetting(String ename) {

Map objmap = null;
if(eroot!=null&&ename!=null&&!ename.equals(""))
objmap = getElements(eroot,ename);
return objmap;
}

private Map getElements(Element root,String ename)
{
Element foo;
Map objmap = new HashMap();
List objlist = root.elements(ename);
for(int i=0;i<objlist.size();i++)
{
foo = (Element)objlist.get(i);
Map tmap = setMapByElement(foo,ename);
objmap.put(foo.attributeValue("id"),tmap);
}
return objmap;
}

public Map getSettingById(String id,String ename) {

Map objmap = null;
if(eroot!=null&&ename!=null&&!ename.equals(""))
objmap = getElementsById(eroot,id,ename);
return objmap;
}
private Map getElementsById(Element root,String id,String ename)
{
Element foo;
Map objmap = null;
List objlist = root.elements(ename);
for(int i=0;i<objlist.size();i++)
{
foo = (Element)objlist.get(i);
String ezid = foo.attributeValue("id");
if(ezid!=null&&ezid.equals(id))
{
objmap = setMapByElement(foo,ename);
break;
}
}
return objmap;
}

private Map setMapByElement(Element foo,String ename)
{
Map tmap = new HashMap();
if(ename.equals("