Java读取文件问题：报错

package com.book.util;

import java.io.File;
import java.io.InputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import com.bowlong.helper.xml.XMLHelper;

public class DomXml {
	public static DomXml my = new DomXml();
	public static Map<String , Sitesign> map = null;
	public static Map<String , Sitesign> getSitesignMap(){	
		if (map==null) {
			map =  new HashMap<String, Sitesign>();
			try {
				SAXReader saxReader = new SAXReader();
//				InputStream is = my.getClass().getResourceAsStream("..\\resources\\sitesign.xml");
//				Document doc = XMLHelper.parseFromStream(is);
//				Element root = doc.getRootElement();
//				XMLHelper.getElementTextString(root);
				Document document = saxReader.read(new File("resources/sitesign.xml"));
				Element element = document.getRootElement(); // 得到Element对象
				List<Element> list = element.elements("SiteSign"); // 取得节点集合
				Sitesign ss = null;
				for (Element e : list) {
					ss = new Sitesign();
					ss.setName(e.elementText("name"));
					ss.setUrl(e.elementText("url"));
					ss.setListStart(e.elementText("ListStart"));
					ss.setListEnd(e.elementText("ListEnd"));
					ss.setContentStart(e.elementText("ContentStart"));
					ss.setContentEnd(e.elementText("ContentEnd"));
					ss.setNeedDelStr(e.elementText("NeedDelStr"));
					map.put(ss.getUrl().split("/")[2], ss);
				}
			} catch (DocumentException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} // 读取XML文件
		}		
		return map;
	}
	public static void main(String[] args) {
		System.out.println(getSitesignMap().size());	
	}
}