Document doc = new Document();
    Element root = doc.getRootElement();
    Element element111 = root.getChild("111");
    List<Element> children = element111.getChildren();
    for (Element element : children) {
        String name = element.getName();//你可以遍历取得这些子节点的名称
        ...
    }

------解决方案--------------------
import java.io.IOException;
import java.util.Iterator;
import java.util.List;

import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;

public class JxXml {	
	public JxXml(){		
		String xmlpath="你的文件.xml";		
		SAXBuilder builder=new SAXBuilder(false);		
		try {			
			Document doc=builder.build(xmlpath);			
			Element objExportExcel=doc.getRootElement();
			Element objfields=objExportExcel.getChild("111");
			List objfield=objfields.getChildren("field");			
			for (Iterator iter = objfield.iterator(); iter.hasNext();) {
				Element field = (Element) iter.next();			
				String str222=field.getChildText("222");			
				String str333=field.getChildText("333");				
			}								
			} catch (JDOMException e) {			
				e.printStackTrace();		
			} catch (IOException e) {			
				e.printStackTrace();		
			}
		}	
	public static void main(String[] args) {		
		new JxXml();	
	}
}